| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.io; |
| |
| import java.io.BufferedInputStream; |
| import java.io.BufferedOutputStream; |
| import java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| import java.io.ByteArrayInputStream; |
| import java.io.CharArrayWriter; |
| import java.io.Closeable; |
| import java.io.EOFException; |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.OutputStream; |
| import java.io.OutputStreamWriter; |
| import java.io.PrintWriter; |
| import java.io.Reader; |
| import java.io.Writer; |
| import java.net.HttpURLConnection; |
| import java.net.ServerSocket; |
| import java.net.Socket; |
| import java.net.URI; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.ReadableByteChannel; |
| import java.nio.channels.Selector; |
| import java.nio.charset.Charset; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| import org.apache.commons.io.output.ByteArrayOutputStream; |
| import org.apache.commons.io.output.StringBuilderWriter; |
| |
| /** |
| * General IO stream manipulation utilities. |
| * <p> |
| * This class provides static utility methods for input/output operations. |
| * <ul> |
| * <li>closeQuietly - these methods close a stream ignoring nulls and exceptions |
| * <li>toXxx/read - these methods read data from a stream |
| * <li>write - these methods write data to a stream |
| * <li>copy - these methods copy all the data from one stream to another |
| * <li>contentEquals - these methods compare the content of two streams |
| * </ul> |
| * <p> |
| * The byte-to-char methods and char-to-byte methods involve a conversion step. |
| * Two methods are provided in each case, one that uses the platform default |
| * encoding and the other which allows you to specify an encoding. You are |
| * encouraged to always specify an encoding because relying on the platform |
| * default can lead to unexpected results, for example when moving from |
| * development to production. |
| * <p> |
| * All the methods in this class that read a stream are buffered internally. |
| * This means that there is no cause to use a <code>BufferedInputStream</code> |
| * or <code>BufferedReader</code>. The default buffer size of 4K has been shown |
| * to be efficient in tests. |
| * <p> |
| * The various copy methods all delegate the actual copying to one of the following methods: |
| * <ul> |
| * <li>{@link #copyLarge(InputStream, OutputStream, byte[])}</li> |
| * <li>{@link #copyLarge(InputStream, OutputStream, long, long, byte[])}</li> |
| * <li>{@link #copyLarge(Reader, Writer, char[])}</li> |
| * <li>{@link #copyLarge(Reader, Writer, long, long, char[])}</li> |
| * </ul> |
| * For example, {@link #copy(InputStream, OutputStream)} calls {@link #copyLarge(InputStream, OutputStream)} |
| * which calls {@link #copy(InputStream, OutputStream, int)} which creates the buffer and calls |
| * {@link #copyLarge(InputStream, OutputStream, byte[])}. |
| * <p> |
| * Applications can re-use buffers by using the underlying methods directly. |
| * This may improve performance for applications that need to do a lot of copying. |
| * <p> |
| * Wherever possible, the methods in this class do <em>not</em> flush or close |
| * the stream. This is to avoid making non-portable assumptions about the |
| * streams' origin and further use. Thus the caller is still responsible for |
| * closing streams after use. |
| * <p> |
| * Origin of code: Excalibur. |
| * |
| * @version $Id$ |
| */ |
| public class IOUtils { |
| // NOTE: This class is focused on InputStream, OutputStream, Reader and |
| // Writer. Each method should take at least one of these as a parameter, |
| // or return one of them. |
| |
| /** |
| * Represents the end-of-file (or stream). |
| * @since 2.5 (made public) |
| */ |
| public static final int EOF = -1; |
| |
| /** |
| * The Unix directory separator character. |
| */ |
| public static final char DIR_SEPARATOR_UNIX = '/'; |
| /** |
| * The Windows directory separator character. |
| */ |
| public static final char DIR_SEPARATOR_WINDOWS = '\\'; |
| /** |
| * The system directory separator character. |
| */ |
| public static final char DIR_SEPARATOR = File.separatorChar; |
| /** |
| * The Unix line separator string. |
| */ |
| public static final String LINE_SEPARATOR_UNIX = "\n"; |
| /** |
| * The Windows line separator string. |
| */ |
| public static final String LINE_SEPARATOR_WINDOWS = "\r\n"; |
| /** |
| * The system line separator string. |
| */ |
| public static final String LINE_SEPARATOR; |
| |
| static { |
| // avoid security issues |
| final StringBuilderWriter buf = new StringBuilderWriter(4); |
| final PrintWriter out = new PrintWriter(buf); |
| out.println(); |
| LINE_SEPARATOR = buf.toString(); |
| out.close(); |
| } |
| |
| /** |
| * The default buffer size ({@value}) to use for |
| * {@link #copyLarge(InputStream, OutputStream)} |
| * and |
| * {@link #copyLarge(Reader, Writer)} |
| */ |
| private static final int DEFAULT_BUFFER_SIZE = 1024 * 4; |
| |
| /** |
| * The default buffer size to use for the skip() methods. |
| */ |
| private static final int SKIP_BUFFER_SIZE = 2048; |
| |
| // Allocated in the relevant skip method if necessary. |
| /* |
| * These buffers are static and are shared between threads. |
| * This is possible because the buffers are write-only - the contents are never read. |
| * |
| * N.B. there is no need to synchronize when creating these because: |
| * - we don't care if the buffer is created multiple times (the data is ignored) |
| * - we always use the same size buffer, so if it it is recreated it will still be OK |
| * (if the buffer size were variable, we would need to synch. to ensure some other thread |
| * did not create a smaller one) |
| */ |
| private static char[] SKIP_CHAR_BUFFER; |
| private static byte[] SKIP_BYTE_BUFFER; |
| |
| /** |
| * Instances should NOT be constructed in standard programming. |
| */ |
| public IOUtils() { |
| super(); |
| } |
| |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Closes a URLConnection. |
| * |
| * @param conn the connection to close. |
| * @since 2.4 |
| */ |
| public static void close(final URLConnection conn) { |
| if (conn instanceof HttpURLConnection) { |
| ((HttpURLConnection) conn).disconnect(); |
| } |
| } |
| |
| /** |
| * Closes an <code>Reader</code> unconditionally. |
| * <p> |
| * Equivalent to {@link Reader#close()}, except any exceptions will be ignored. |
| * This is typically used in finally blocks. |
| * <p> |
| * Example code: |
| * <pre> |
| * char[] data = new char[1024]; |
| * Reader in = null; |
| * try { |
| * in = new FileReader("foo.txt"); |
| * in.read(data); |
| * in.close(); //close errors are handled |
| * } catch (Exception e) { |
| * // error handling |
| * } finally { |
| * IOUtils.closeQuietly(in); |
| * } |
| * </pre> |
| * |
| * @param input the Reader to close, may be null or already closed |
| * |
| * @deprecated As of 2.6 removed without replacement. Please use the try-with-resources statement or handle |
| * suppressed exceptions manually. |
| * @see Throwable#addSuppressed(java.lang.Throwable) |
| */ |
| @Deprecated |
| public static void closeQuietly(final Reader input) { |
| closeQuietly((Closeable) input); |
| } |
| |
| /** |
| * Closes an <code>Writer</code> unconditionally. |
| * <p> |
| * Equivalent to {@link Writer#close()}, except any exceptions will be ignored. |
| * This is typically used in finally blocks. |
| * <p> |
| * Example code: |
| * <pre> |
| * Writer out = null; |
| * try { |
| * out = new StringWriter(); |
| * out.write("Hello World"); |
| * out.close(); //close errors are handled |
| * } catch (Exception e) { |
| * // error handling |
| * } finally { |
| * IOUtils.closeQuietly(out); |
| * } |
| * </pre> |
| * |
| * @param output the Writer to close, may be null or already closed |
| * |
| * @deprecated As of 2.6 removed without replacement. Please use the try-with-resources statement or handle |
| * suppressed exceptions manually. |
| * @see Throwable#addSuppressed(java.lang.Throwable) |
| */ |
| @Deprecated |
| public static void closeQuietly(final Writer output) { |
| closeQuietly((Closeable) output); |
| } |
| |
| /** |
| * Closes an <code>InputStream</code> unconditionally. |
| * <p> |
| * Equivalent to {@link InputStream#close()}, except any exceptions will be ignored. |
| * This is typically used in finally blocks. |
| * <p> |
| * Example code: |
| * <pre> |
| * byte[] data = new byte[1024]; |
| * InputStream in = null; |
| * try { |
| * in = new FileInputStream("foo.txt"); |
| * in.read(data); |
| * in.close(); //close errors are handled |
| * } catch (Exception e) { |
| * // error handling |
| * } finally { |
| * IOUtils.closeQuietly(in); |
| * } |
| * </pre> |
| * |
| * @param input the InputStream to close, may be null or already closed |
| * |
| * @deprecated As of 2.6 removed without replacement. Please use the try-with-resources statement or handle |
| * suppressed exceptions manually. |
| * @see Throwable#addSuppressed(java.lang.Throwable) |
| */ |
| @Deprecated |
| public static void closeQuietly(final InputStream input) { |
| closeQuietly((Closeable) input); |
| } |
| |
| /** |
| * Closes an <code>OutputStream</code> unconditionally. |
| * <p> |
| * Equivalent to {@link OutputStream#close()}, except any exceptions will be ignored. |
| * This is typically used in finally blocks. |
| * <p> |
| * Example code: |
| * <pre> |
| * byte[] data = "Hello, World".getBytes(); |
| * |
| * OutputStream out = null; |
| * try { |
| * out = new FileOutputStream("foo.txt"); |
| * out.write(data); |
| * out.close(); //close errors are handled |
| * } catch (IOException e) { |
| * // error handling |
| * } finally { |
| * IOUtils.closeQuietly(out); |
| * } |
| * </pre> |
| * |
| * @param output the OutputStream to close, may be null or already closed |
| * |
| * @deprecated As of 2.6 removed without replacement. Please use the try-with-resources statement or handle |
| * suppressed exceptions manually. |
| * @see Throwable#addSuppressed(java.lang.Throwable) |
| */ |
| @Deprecated |
| public static void closeQuietly(final OutputStream output) { |
| closeQuietly((Closeable) output); |
| } |
| |
| /** |
| * Closes a <code>Closeable</code> unconditionally. |
| * <p> |
| * Equivalent to {@link Closeable#close()}, except any exceptions will be ignored. This is typically used in |
| * finally blocks. |
| * <p> |
| * Example code: |
| * </p> |
| * <pre> |
| * Closeable closeable = null; |
| * try { |
| * closeable = new FileReader("foo.txt"); |
| * // process closeable |
| * closeable.close(); |
| * } catch (Exception e) { |
| * // error handling |
| * } finally { |
| * IOUtils.closeQuietly(closeable); |
| * } |
| * </pre> |
| * <p> |
| * Closing all streams: |
| * </p> |
| * <pre> |
| * try { |
| * return IOUtils.copy(inputStream, outputStream); |
| * } finally { |
| * IOUtils.closeQuietly(inputStream); |
| * IOUtils.closeQuietly(outputStream); |
| * } |
| * </pre> |
| * |
| * @param closeable the objects to close, may be null or already closed |
| * @since 2.0 |
| * |
| * @deprecated As of 2.6 removed without replacement. Please use the try-with-resources statement or handle |
| * suppressed exceptions manually. |
| * @see Throwable#addSuppressed(java.lang.Throwable) |
| */ |
| @Deprecated |
| public static void closeQuietly(final Closeable closeable) { |
| try { |
| if (closeable != null) { |
| closeable.close(); |
| } |
| } catch (final IOException ioe) { |
| // ignore |
| } |
| } |
| |
| /** |
| * Closes a <code>Closeable</code> unconditionally. |
| * <p> |
| * Equivalent to {@link Closeable#close()}, except any exceptions will be ignored. |
| * <p> |
| * This is typically used in finally blocks to ensure that the closeable is closed |
| * even if an Exception was thrown before the normal close statement was reached. |
| * <br> |
| * <b>It should not be used to replace the close statement(s) |
| * which should be present for the non-exceptional case.</b> |
| * <br> |
| * It is only intended to simplify tidying up where normal processing has already failed |
| * and reporting close failure as well is not necessary or useful. |
| * <p> |
| * Example code: |
| * </p> |
| * <pre> |
| * Closeable closeable = null; |
| * try { |
| * closeable = new FileReader("foo.txt"); |
| * // processing using the closeable; may throw an Exception |
| * closeable.close(); // Normal close - exceptions not ignored |
| * } catch (Exception e) { |
| * // error handling |
| * } finally { |
| * <b>IOUtils.closeQuietly(closeable); // In case normal close was skipped due to Exception</b> |
| * } |
| * </pre> |
| * <p> |
| * Closing all streams: |
| * <br> |
| * <pre> |
| * try { |
| * return IOUtils.copy(inputStream, outputStream); |
| * } finally { |
| * IOUtils.closeQuietly(inputStream, outputStream); |
| * } |
| * </pre> |
| * |
| * @param closeables the objects to close, may be null or already closed |
| * @see #closeQuietly(Closeable) |
| * @since 2.5 |
| * |
| * @deprecated As of 2.6 removed without replacement. Please use the try-with-resources statement or handle |
| * suppressed exceptions manually. |
| * @see Throwable#addSuppressed(java.lang.Throwable) |
| */ |
| @Deprecated |
| public static void closeQuietly(final Closeable... closeables) { |
| if (closeables == null) { |
| return; |
| } |
| for (final Closeable closeable : closeables) { |
| closeQuietly(closeable); |
| } |
| } |
| |
| /** |
| * Closes a <code>Socket</code> unconditionally. |
| * <p> |
| * Equivalent to {@link Socket#close()}, except any exceptions will be ignored. |
| * This is typically used in finally blocks. |
| * <p> |
| * Example code: |
| * <pre> |
| * Socket socket = null; |
| * try { |
| * socket = new Socket("http://www.foo.com/", 80); |
| * // process socket |
| * socket.close(); |
| * } catch (Exception e) { |
| * // error handling |
| * } finally { |
| * IOUtils.closeQuietly(socket); |
| * } |
| * </pre> |
| * |
| * @param sock the Socket to close, may be null or already closed |
| * @since 2.0 |
| * |
| * @deprecated As of 2.6 removed without replacement. Please use the try-with-resources statement or handle |
| * suppressed exceptions manually. |
| * @see Throwable#addSuppressed(java.lang.Throwable) |
| */ |
| @Deprecated |
| public static void closeQuietly(final Socket sock) { |
| if (sock != null) { |
| try { |
| sock.close(); |
| } catch (final IOException ioe) { |
| // ignored |
| } |
| } |
| } |
| |
| /** |
| * Closes a <code>Selector</code> unconditionally. |
| * <p> |
| * Equivalent to {@link Selector#close()}, except any exceptions will be ignored. |
| * This is typically used in finally blocks. |
| * <p> |
| * Example code: |
| * <pre> |
| * Selector selector = null; |
| * try { |
| * selector = Selector.open(); |
| * // process socket |
| * |
| * } catch (Exception e) { |
| * // error handling |
| * } finally { |
| * IOUtils.closeQuietly(selector); |
| * } |
| * </pre> |
| * |
| * @param selector the Selector to close, may be null or already closed |
| * @since 2.2 |
| * |
| * @deprecated As of 2.6 removed without replacement. Please use the try-with-resources statement or handle |
| * suppressed exceptions manually. |
| * @see Throwable#addSuppressed(java.lang.Throwable) |
| */ |
| @Deprecated |
| public static void closeQuietly(final Selector selector) { |
| if (selector != null) { |
| try { |
| selector.close(); |
| } catch (final IOException ioe) { |
| // ignored |
| } |
| } |
| } |
| |
| /** |
| * Closes a <code>ServerSocket</code> unconditionally. |
| * <p> |
| * Equivalent to {@link ServerSocket#close()}, except any exceptions will be ignored. |
| * This is typically used in finally blocks. |
| * <p> |
| * Example code: |
| * <pre> |
| * ServerSocket socket = null; |
| * try { |
| * socket = new ServerSocket(); |
| * // process socket |
| * socket.close(); |
| * } catch (Exception e) { |
| * // error handling |
| * } finally { |
| * IOUtils.closeQuietly(socket); |
| * } |
| * </pre> |
| * |
| * @param sock the ServerSocket to close, may be null or already closed |
| * @since 2.2 |
| * |
| * @deprecated As of 2.6 removed without replacement. Please use the try-with-resources statement or handle |
| * suppressed exceptions manually. |
| * @see Throwable#addSuppressed(java.lang.Throwable) |
| */ |
| @Deprecated |
| public static void closeQuietly(final ServerSocket sock) { |
| if (sock != null) { |
| try { |
| sock.close(); |
| } catch (final IOException ioe) { |
| // ignored |
| } |
| } |
| } |
| |
| /** |
| * Fetches entire contents of an <code>InputStream</code> and represent |
| * same data as result InputStream. |
| * <p> |
| * This method is useful where, |
| * <ul> |
| * <li>Source InputStream is slow.</li> |
| * <li>It has network resources associated, so we cannot keep it open for |
| * long time.</li> |
| * <li>It has network timeout associated.</li> |
| * </ul> |
| * It can be used in favor of {@link #toByteArray(InputStream)}, since it |
| * avoids unnecessary allocation and copy of byte[].<br> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param input Stream to be fully buffered. |
| * @return A fully buffered stream. |
| * @throws IOException if an I/O error occurs |
| * @since 2.0 |
| */ |
| public static InputStream toBufferedInputStream(final InputStream input) throws IOException { |
| return ByteArrayOutputStream.toBufferedInputStream(input); |
| } |
| |
| /** |
| * Fetches entire contents of an <code>InputStream</code> and represent |
| * same data as result InputStream. |
| * <p> |
| * This method is useful where, |
| * <ul> |
| * <li>Source InputStream is slow.</li> |
| * <li>It has network resources associated, so we cannot keep it open for |
| * long time.</li> |
| * <li>It has network timeout associated.</li> |
| * </ul> |
| * It can be used in favor of {@link #toByteArray(InputStream)}, since it |
| * avoids unnecessary allocation and copy of byte[].<br> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param input Stream to be fully buffered. |
| * @param size the initial buffer size |
| * @return A fully buffered stream. |
| * @throws IOException if an I/O error occurs |
| * @since 2.5 |
| */ |
| public static InputStream toBufferedInputStream(final InputStream input, int size) throws IOException { |
| return ByteArrayOutputStream.toBufferedInputStream(input, size); |
| } |
| |
| /** |
| * Returns the given reader if it is a {@link BufferedReader}, otherwise creates a BufferedReader from the given |
| * reader. |
| * |
| * @param reader the reader to wrap or return (not null) |
| * @return the given reader or a new {@link BufferedReader} for the given reader |
| * @throws NullPointerException if the input parameter is null |
| * @see #buffer(Reader) |
| * @since 2.2 |
| */ |
| public static BufferedReader toBufferedReader(final Reader reader) { |
| return reader instanceof BufferedReader ? (BufferedReader) reader : new BufferedReader(reader); |
| } |
| |
| /** |
| * Returns the given reader if it is a {@link BufferedReader}, otherwise creates a BufferedReader from the given |
| * reader. |
| * |
| * @param reader the reader to wrap or return (not null) |
| * @param size the buffer size, if a new BufferedReader is created. |
| * @return the given reader or a new {@link BufferedReader} for the given reader |
| * @throws NullPointerException if the input parameter is null |
| * @see #buffer(Reader) |
| * @since 2.5 |
| */ |
| public static BufferedReader toBufferedReader(final Reader reader, int size) { |
| return reader instanceof BufferedReader ? (BufferedReader) reader : new BufferedReader(reader, size); |
| } |
| |
| /** |
| * Returns the given reader if it is already a {@link BufferedReader}, otherwise creates a BufferedReader from |
| * the given reader. |
| * |
| * @param reader the reader to wrap or return (not null) |
| * @return the given reader or a new {@link BufferedReader} for the given reader |
| * @throws NullPointerException if the input parameter is null |
| * @since 2.5 |
| */ |
| public static BufferedReader buffer(final Reader reader) { |
| return reader instanceof BufferedReader ? (BufferedReader) reader : new BufferedReader(reader); |
| } |
| |
| /** |
| * Returns the given reader if it is already a {@link BufferedReader}, otherwise creates a BufferedReader from the |
| * given reader. |
| * |
| * @param reader the reader to wrap or return (not null) |
| * @param size the buffer size, if a new BufferedReader is created. |
| * @return the given reader or a new {@link BufferedReader} for the given reader |
| * @throws NullPointerException if the input parameter is null |
| * @since 2.5 |
| */ |
| public static BufferedReader buffer(final Reader reader, int size) { |
| return reader instanceof BufferedReader ? (BufferedReader) reader : new BufferedReader(reader, size); |
| } |
| |
| /** |
| * Returns the given Writer if it is already a {@link BufferedWriter}, otherwise creates a BufferedWriter from the |
| * given Writer. |
| * |
| * @param writer the Writer to wrap or return (not null) |
| * @return the given Writer or a new {@link BufferedWriter} for the given Writer |
| * @throws NullPointerException if the input parameter is null |
| * @since 2.5 |
| */ |
| public static BufferedWriter buffer(final Writer writer) { |
| return writer instanceof BufferedWriter ? (BufferedWriter) writer : new BufferedWriter(writer); |
| } |
| |
| /** |
| * Returns the given Writer if it is already a {@link BufferedWriter}, otherwise creates a BufferedWriter from the |
| * given Writer. |
| * |
| * @param writer the Writer to wrap or return (not null) |
| * @param size the buffer size, if a new BufferedWriter is created. |
| * @return the given Writer or a new {@link BufferedWriter} for the given Writer |
| * @throws NullPointerException if the input parameter is null |
| * @since 2.5 |
| */ |
| public static BufferedWriter buffer(final Writer writer, int size) { |
| return writer instanceof BufferedWriter ? (BufferedWriter) writer : new BufferedWriter(writer, size); |
| } |
| |
| /** |
| * Returns the given OutputStream if it is already a {@link BufferedOutputStream}, otherwise creates a |
| * BufferedOutputStream from the given OutputStream. |
| * |
| * @param outputStream the OutputStream to wrap or return (not null) |
| * @return the given OutputStream or a new {@link BufferedOutputStream} for the given OutputStream |
| * @throws NullPointerException if the input parameter is null |
| * @since 2.5 |
| */ |
| public static BufferedOutputStream buffer(final OutputStream outputStream) { |
| // reject null early on rather than waiting for IO operation to fail |
| if (outputStream == null) { // not checked by BufferedOutputStream |
| throw new NullPointerException(); |
| } |
| return outputStream instanceof BufferedOutputStream ? |
| (BufferedOutputStream) outputStream : new BufferedOutputStream(outputStream); |
| } |
| |
| /** |
| * Returns the given OutputStream if it is already a {@link BufferedOutputStream}, otherwise creates a |
| * BufferedOutputStream from the given OutputStream. |
| * |
| * @param outputStream the OutputStream to wrap or return (not null) |
| * @param size the buffer size, if a new BufferedOutputStream is created. |
| * @return the given OutputStream or a new {@link BufferedOutputStream} for the given OutputStream |
| * @throws NullPointerException if the input parameter is null |
| * @since 2.5 |
| */ |
| public static BufferedOutputStream buffer(final OutputStream outputStream, int size) { |
| // reject null early on rather than waiting for IO operation to fail |
| if (outputStream == null) { // not checked by BufferedOutputStream |
| throw new NullPointerException(); |
| } |
| return outputStream instanceof BufferedOutputStream ? |
| (BufferedOutputStream) outputStream : new BufferedOutputStream(outputStream, size); |
| } |
| |
| /** |
| * Returns the given InputStream if it is already a {@link BufferedInputStream}, otherwise creates a |
| * BufferedInputStream from the given InputStream. |
| * |
| * @param inputStream the InputStream to wrap or return (not null) |
| * @return the given InputStream or a new {@link BufferedInputStream} for the given InputStream |
| * @throws NullPointerException if the input parameter is null |
| * @since 2.5 |
| */ |
| public static BufferedInputStream buffer(final InputStream inputStream) { |
| // reject null early on rather than waiting for IO operation to fail |
| if (inputStream == null) { // not checked by BufferedInputStream |
| throw new NullPointerException(); |
| } |
| return inputStream instanceof BufferedInputStream ? |
| (BufferedInputStream) inputStream : new BufferedInputStream(inputStream); |
| } |
| |
| /** |
| * Returns the given InputStream if it is already a {@link BufferedInputStream}, otherwise creates a |
| * BufferedInputStream from the given InputStream. |
| * |
| * @param inputStream the InputStream to wrap or return (not null) |
| * @param size the buffer size, if a new BufferedInputStream is created. |
| * @return the given InputStream or a new {@link BufferedInputStream} for the given InputStream |
| * @throws NullPointerException if the input parameter is null |
| * @since 2.5 |
| */ |
| public static BufferedInputStream buffer(final InputStream inputStream, int size) { |
| // reject null early on rather than waiting for IO operation to fail |
| if (inputStream == null) { // not checked by BufferedInputStream |
| throw new NullPointerException(); |
| } |
| return inputStream instanceof BufferedInputStream ? |
| (BufferedInputStream) inputStream : new BufferedInputStream(inputStream, size); |
| } |
| |
| // read toByteArray |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a <code>byte[]</code>. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @return the requested byte array |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| */ |
| public static byte[] toByteArray(final InputStream input) throws IOException { |
| final ByteArrayOutputStream output = new ByteArrayOutputStream(); |
| copy(input, output); |
| return output.toByteArray(); |
| } |
| |
| /** |
| * Gets contents of an <code>InputStream</code> as a <code>byte[]</code>. |
| * Use this method instead of <code>toByteArray(InputStream)</code> |
| * when <code>InputStream</code> size is known. |
| * <b>NOTE:</b> the method checks that the length can safely be cast to an int without truncation |
| * before using {@link IOUtils#toByteArray(java.io.InputStream, int)} to read into the byte array. |
| * (Arrays can have no more than Integer.MAX_VALUE entries anyway) |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param size the size of <code>InputStream</code> |
| * @return the requested byte array |
| * @throws IOException if an I/O error occurs or <code>InputStream</code> size differ from parameter |
| * size |
| * @throws IllegalArgumentException if size is less than zero or size is greater than Integer.MAX_VALUE |
| * @see IOUtils#toByteArray(java.io.InputStream, int) |
| * @since 2.1 |
| */ |
| public static byte[] toByteArray(final InputStream input, final long size) throws IOException { |
| |
| if (size > Integer.MAX_VALUE) { |
| throw new IllegalArgumentException("Size cannot be greater than Integer max value: " + size); |
| } |
| |
| return toByteArray(input, (int) size); |
| } |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a <code>byte[]</code>. |
| * Use this method instead of <code>toByteArray(InputStream)</code> |
| * when <code>InputStream</code> size is known |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param size the size of <code>InputStream</code> |
| * @return the requested byte array |
| * @throws IOException if an I/O error occurs or <code>InputStream</code> size differ from parameter |
| * size |
| * @throws IllegalArgumentException if size is less than zero |
| * @since 2.1 |
| */ |
| public static byte[] toByteArray(final InputStream input, final int size) throws IOException { |
| |
| if (size < 0) { |
| throw new IllegalArgumentException("Size must be equal or greater than zero: " + size); |
| } |
| |
| if (size == 0) { |
| return new byte[0]; |
| } |
| |
| final byte[] data = new byte[size]; |
| int offset = 0; |
| int readed; |
| |
| while (offset < size && (readed = input.read(data, offset, size - offset)) != EOF) { |
| offset += readed; |
| } |
| |
| if (offset != size) { |
| throw new IOException("Unexpected readed size. current: " + offset + ", excepted: " + size); |
| } |
| |
| return data; |
| } |
| |
| /** |
| * Gets the contents of a <code>Reader</code> as a <code>byte[]</code> |
| * using the default character encoding of the platform. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * |
| * @param input the <code>Reader</code> to read from |
| * @return the requested byte array |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @deprecated 2.5 use {@link #toByteArray(Reader, Charset)} instead |
| */ |
| @Deprecated |
| public static byte[] toByteArray(final Reader input) throws IOException { |
| return toByteArray(input, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Gets the contents of a <code>Reader</code> as a <code>byte[]</code> |
| * using the specified character encoding. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * |
| * @param input the <code>Reader</code> to read from |
| * @param encoding the encoding to use, null means platform default |
| * @return the requested byte array |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static byte[] toByteArray(final Reader input, final Charset encoding) throws IOException { |
| final ByteArrayOutputStream output = new ByteArrayOutputStream(); |
| copy(input, output, encoding); |
| return output.toByteArray(); |
| } |
| |
| /** |
| * Gets the contents of a <code>Reader</code> as a <code>byte[]</code> |
| * using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * |
| * @param input the <code>Reader</code> to read from |
| * @param encoding the encoding to use, null means platform default |
| * @return the requested byte array |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 1.1 |
| */ |
| public static byte[] toByteArray(final Reader input, final String encoding) throws IOException { |
| return toByteArray(input, Charsets.toCharset(encoding)); |
| } |
| |
| /** |
| * Gets the contents of a <code>String</code> as a <code>byte[]</code> |
| * using the default character encoding of the platform. |
| * <p> |
| * This is the same as {@link String#getBytes()}. |
| * |
| * @param input the <code>String</code> to convert |
| * @return the requested byte array |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs (never occurs) |
| * @deprecated 2.5 Use {@link String#getBytes()} instead |
| */ |
| @Deprecated |
| public static byte[] toByteArray(final String input) throws IOException { |
| // make explicit the use of the default charset |
| return input.getBytes(Charset.defaultCharset()); |
| } |
| |
| /** |
| * Gets the contents of a <code>URI</code> as a <code>byte[]</code>. |
| * |
| * @param uri the <code>URI</code> to read |
| * @return the requested byte array |
| * @throws NullPointerException if the uri is null |
| * @throws IOException if an I/O exception occurs |
| * @since 2.4 |
| */ |
| public static byte[] toByteArray(final URI uri) throws IOException { |
| return IOUtils.toByteArray(uri.toURL()); |
| } |
| |
| /** |
| * Gets the contents of a <code>URL</code> as a <code>byte[]</code>. |
| * |
| * @param url the <code>URL</code> to read |
| * @return the requested byte array |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O exception occurs |
| * @since 2.4 |
| */ |
| public static byte[] toByteArray(final URL url) throws IOException { |
| final URLConnection conn = url.openConnection(); |
| try { |
| return IOUtils.toByteArray(conn); |
| } finally { |
| close(conn); |
| } |
| } |
| |
| /** |
| * Gets the contents of a <code>URLConnection</code> as a <code>byte[]</code>. |
| * |
| * @param urlConn the <code>URLConnection</code> to read |
| * @return the requested byte array |
| * @throws NullPointerException if the urlConn is null |
| * @throws IOException if an I/O exception occurs |
| * @since 2.4 |
| */ |
| public static byte[] toByteArray(final URLConnection urlConn) throws IOException { |
| try (InputStream inputStream = urlConn.getInputStream()) { |
| return IOUtils.toByteArray(inputStream); |
| } |
| } |
| |
| // read char[] |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a character array |
| * using the default character encoding of the platform. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param is the <code>InputStream</code> to read from |
| * @return the requested character array |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| * @deprecated 2.5 use {@link #toCharArray(InputStream, Charset)} instead |
| */ |
| @Deprecated |
| public static char[] toCharArray(final InputStream is) throws IOException { |
| return toCharArray(is, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a character array |
| * using the specified character encoding. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param is the <code>InputStream</code> to read from |
| * @param encoding the encoding to use, null means platform default |
| * @return the requested character array |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static char[] toCharArray(final InputStream is, final Charset encoding) |
| throws IOException { |
| final CharArrayWriter output = new CharArrayWriter(); |
| copy(is, output, encoding); |
| return output.toCharArray(); |
| } |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a character array |
| * using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param is the <code>InputStream</code> to read from |
| * @param encoding the encoding to use, null means platform default |
| * @return the requested character array |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 1.1 |
| */ |
| public static char[] toCharArray(final InputStream is, final String encoding) throws IOException { |
| return toCharArray(is, Charsets.toCharset(encoding)); |
| } |
| |
| /** |
| * Gets the contents of a <code>Reader</code> as a character array. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * |
| * @param input the <code>Reader</code> to read from |
| * @return the requested character array |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| */ |
| public static char[] toCharArray(final Reader input) throws IOException { |
| final CharArrayWriter sw = new CharArrayWriter(); |
| copy(input, sw); |
| return sw.toCharArray(); |
| } |
| |
| // read toString |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a String |
| * using the default character encoding of the platform. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @return the requested String |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @deprecated 2.5 use {@link #toString(InputStream, Charset)} instead |
| */ |
| @Deprecated |
| public static String toString(final InputStream input) throws IOException { |
| return toString(input, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a String |
| * using the specified character encoding. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * </p> |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param encoding the encoding to use, null means platform default |
| * @return the requested String |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static String toString(final InputStream input, final Charset encoding) throws IOException { |
| final StringBuilderWriter sw = new StringBuilderWriter(); |
| copy(input, sw, encoding); |
| return sw.toString(); |
| } |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a String |
| * using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param encoding the encoding to use, null means platform default |
| * @return the requested String |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| */ |
| public static String toString(final InputStream input, final String encoding) |
| throws IOException { |
| return toString(input, Charsets.toCharset(encoding)); |
| } |
| |
| /** |
| * Gets the contents of a <code>Reader</code> as a String. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * |
| * @param input the <code>Reader</code> to read from |
| * @return the requested String |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| */ |
| public static String toString(final Reader input) throws IOException { |
| final StringBuilderWriter sw = new StringBuilderWriter(); |
| copy(input, sw); |
| return sw.toString(); |
| } |
| |
| /** |
| * Gets the contents at the given URI. |
| * |
| * @param uri The URI source. |
| * @return The contents of the URL as a String. |
| * @throws IOException if an I/O exception occurs. |
| * @since 2.1 |
| * @deprecated 2.5 use {@link #toString(URI, Charset)} instead |
| */ |
| @Deprecated |
| public static String toString(final URI uri) throws IOException { |
| return toString(uri, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Gets the contents at the given URI. |
| * |
| * @param uri The URI source. |
| * @param encoding The encoding name for the URL contents. |
| * @return The contents of the URL as a String. |
| * @throws IOException if an I/O exception occurs. |
| * @since 2.3. |
| */ |
| public static String toString(final URI uri, final Charset encoding) throws IOException { |
| return toString(uri.toURL(), Charsets.toCharset(encoding)); |
| } |
| |
| /** |
| * Gets the contents at the given URI. |
| * |
| * @param uri The URI source. |
| * @param encoding The encoding name for the URL contents. |
| * @return The contents of the URL as a String. |
| * @throws IOException if an I/O exception occurs. |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 2.1 |
| */ |
| public static String toString(final URI uri, final String encoding) throws IOException { |
| return toString(uri, Charsets.toCharset(encoding)); |
| } |
| |
| /** |
| * Gets the contents at the given URL. |
| * |
| * @param url The URL source. |
| * @return The contents of the URL as a String. |
| * @throws IOException if an I/O exception occurs. |
| * @since 2.1 |
| * @deprecated 2.5 use {@link #toString(URL, Charset)} instead |
| */ |
| @Deprecated |
| public static String toString(final URL url) throws IOException { |
| return toString(url, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Gets the contents at the given URL. |
| * |
| * @param url The URL source. |
| * @param encoding The encoding name for the URL contents. |
| * @return The contents of the URL as a String. |
| * @throws IOException if an I/O exception occurs. |
| * @since 2.3 |
| */ |
| public static String toString(final URL url, final Charset encoding) throws IOException { |
| try (InputStream inputStream = url.openStream()) { |
| return toString(inputStream, encoding); |
| } |
| } |
| |
| /** |
| * Gets the contents at the given URL. |
| * |
| * @param url The URL source. |
| * @param encoding The encoding name for the URL contents. |
| * @return The contents of the URL as a String. |
| * @throws IOException if an I/O exception occurs. |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 2.1 |
| */ |
| public static String toString(final URL url, final String encoding) throws IOException { |
| return toString(url, Charsets.toCharset(encoding)); |
| } |
| |
| /** |
| * Gets the contents of a <code>byte[]</code> as a String |
| * using the default character encoding of the platform. |
| * |
| * @param input the byte array to read from |
| * @return the requested String |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs (never occurs) |
| * @deprecated 2.5 Use {@link String#String(byte[])} instead |
| */ |
| @Deprecated |
| public static String toString(final byte[] input) throws IOException { |
| // make explicit the use of the default charset |
| return new String(input, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Gets the contents of a <code>byte[]</code> as a String |
| * using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * |
| * @param input the byte array to read from |
| * @param encoding the encoding to use, null means platform default |
| * @return the requested String |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs (never occurs) |
| */ |
| public static String toString(final byte[] input, final String encoding) throws IOException { |
| return new String(input, Charsets.toCharset(encoding)); |
| } |
| |
| // readLines |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a list of Strings, |
| * one entry per line, using the default character encoding of the platform. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param input the <code>InputStream</code> to read from, not null |
| * @return the list of Strings, never null |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| * @deprecated 2.5 use {@link #readLines(InputStream, Charset)} instead |
| */ |
| @Deprecated |
| public static List<String> readLines(final InputStream input) throws IOException { |
| return readLines(input, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a list of Strings, |
| * one entry per line, using the specified character encoding. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param input the <code>InputStream</code> to read from, not null |
| * @param encoding the encoding to use, null means platform default |
| * @return the list of Strings, never null |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static List<String> readLines(final InputStream input, final Charset encoding) throws IOException { |
| final InputStreamReader reader = new InputStreamReader(input, Charsets.toCharset(encoding)); |
| return readLines(reader); |
| } |
| |
| /** |
| * Gets the contents of an <code>InputStream</code> as a list of Strings, |
| * one entry per line, using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * |
| * @param input the <code>InputStream</code> to read from, not null |
| * @param encoding the encoding to use, null means platform default |
| * @return the list of Strings, never null |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 1.1 |
| */ |
| public static List<String> readLines(final InputStream input, final String encoding) throws IOException { |
| return readLines(input, Charsets.toCharset(encoding)); |
| } |
| |
| /** |
| * Gets the contents of a <code>Reader</code> as a list of Strings, |
| * one entry per line. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * |
| * @param input the <code>Reader</code> to read from, not null |
| * @return the list of Strings, never null |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| */ |
| public static List<String> readLines(final Reader input) throws IOException { |
| final BufferedReader reader = toBufferedReader(input); |
| final List<String> list = new ArrayList<>(); |
| String line = reader.readLine(); |
| while (line != null) { |
| list.add(line); |
| line = reader.readLine(); |
| } |
| return list; |
| } |
| |
| // lineIterator |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Returns an Iterator for the lines in a <code>Reader</code>. |
| * <p> |
| * <code>LineIterator</code> holds a reference to the open |
| * <code>Reader</code> specified here. When you have finished with the |
| * iterator you should close the reader to free internal resources. |
| * This can be done by closing the reader directly, or by calling |
| * {@link LineIterator#close()} or {@link LineIterator#closeQuietly(LineIterator)}. |
| * <p> |
| * The recommended usage pattern is: |
| * <pre> |
| * try { |
| * LineIterator it = IOUtils.lineIterator(reader); |
| * while (it.hasNext()) { |
| * String line = it.nextLine(); |
| * /// do something with line |
| * } |
| * } finally { |
| * IOUtils.closeQuietly(reader); |
| * } |
| * </pre> |
| * |
| * @param reader the <code>Reader</code> to read from, not null |
| * @return an Iterator of the lines in the reader, never null |
| * @throws IllegalArgumentException if the reader is null |
| * @since 1.2 |
| */ |
| public static LineIterator lineIterator(final Reader reader) { |
| return new LineIterator(reader); |
| } |
| |
| /** |
| * Returns an Iterator for the lines in an <code>InputStream</code>, using |
| * the character encoding specified (or default encoding if null). |
| * <p> |
| * <code>LineIterator</code> holds a reference to the open |
| * <code>InputStream</code> specified here. When you have finished with |
| * the iterator you should close the stream to free internal resources. |
| * This can be done by closing the stream directly, or by calling |
| * {@link LineIterator#close()} or {@link LineIterator#closeQuietly(LineIterator)}. |
| * <p> |
| * The recommended usage pattern is: |
| * <pre> |
| * try { |
| * LineIterator it = IOUtils.lineIterator(stream, charset); |
| * while (it.hasNext()) { |
| * String line = it.nextLine(); |
| * /// do something with line |
| * } |
| * } finally { |
| * IOUtils.closeQuietly(stream); |
| * } |
| * </pre> |
| * |
| * @param input the <code>InputStream</code> to read from, not null |
| * @param encoding the encoding to use, null means platform default |
| * @return an Iterator of the lines in the reader, never null |
| * @throws IllegalArgumentException if the input is null |
| * @throws IOException if an I/O error occurs, such as if the encoding is invalid |
| * @since 2.3 |
| */ |
| public static LineIterator lineIterator(final InputStream input, final Charset encoding) throws IOException { |
| return new LineIterator(new InputStreamReader(input, Charsets.toCharset(encoding))); |
| } |
| |
| /** |
| * Returns an Iterator for the lines in an <code>InputStream</code>, using |
| * the character encoding specified (or default encoding if null). |
| * <p> |
| * <code>LineIterator</code> holds a reference to the open |
| * <code>InputStream</code> specified here. When you have finished with |
| * the iterator you should close the stream to free internal resources. |
| * This can be done by closing the stream directly, or by calling |
| * {@link LineIterator#close()} or {@link LineIterator#closeQuietly(LineIterator)}. |
| * <p> |
| * The recommended usage pattern is: |
| * <pre> |
| * try { |
| * LineIterator it = IOUtils.lineIterator(stream, "UTF-8"); |
| * while (it.hasNext()) { |
| * String line = it.nextLine(); |
| * /// do something with line |
| * } |
| * } finally { |
| * IOUtils.closeQuietly(stream); |
| * } |
| * </pre> |
| * |
| * @param input the <code>InputStream</code> to read from, not null |
| * @param encoding the encoding to use, null means platform default |
| * @return an Iterator of the lines in the reader, never null |
| * @throws IllegalArgumentException if the input is null |
| * @throws IOException if an I/O error occurs, such as if the encoding is invalid |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 1.2 |
| */ |
| public static LineIterator lineIterator(final InputStream input, final String encoding) throws IOException { |
| return lineIterator(input, Charsets.toCharset(encoding)); |
| } |
| |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Converts the specified CharSequence to an input stream, encoded as bytes |
| * using the default character encoding of the platform. |
| * |
| * @param input the CharSequence to convert |
| * @return an input stream |
| * @since 2.0 |
| * @deprecated 2.5 use {@link #toInputStream(CharSequence, Charset)} instead |
| */ |
| @Deprecated |
| public static InputStream toInputStream(final CharSequence input) { |
| return toInputStream(input, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Converts the specified CharSequence to an input stream, encoded as bytes |
| * using the specified character encoding. |
| * |
| * @param input the CharSequence to convert |
| * @param encoding the encoding to use, null means platform default |
| * @return an input stream |
| * @since 2.3 |
| */ |
| public static InputStream toInputStream(final CharSequence input, final Charset encoding) { |
| return toInputStream(input.toString(), encoding); |
| } |
| |
| /** |
| * Converts the specified CharSequence to an input stream, encoded as bytes |
| * using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * |
| * @param input the CharSequence to convert |
| * @param encoding the encoding to use, null means platform default |
| * @return an input stream |
| * @throws IOException if the encoding is invalid |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 2.0 |
| */ |
| public static InputStream toInputStream(final CharSequence input, final String encoding) throws IOException { |
| return toInputStream(input, Charsets.toCharset(encoding)); |
| } |
| |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Converts the specified string to an input stream, encoded as bytes |
| * using the default character encoding of the platform. |
| * |
| * @param input the string to convert |
| * @return an input stream |
| * @since 1.1 |
| * @deprecated 2.5 use {@link #toInputStream(String, Charset)} instead |
| */ |
| @Deprecated |
| public static InputStream toInputStream(final String input) { |
| return toInputStream(input, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Converts the specified string to an input stream, encoded as bytes |
| * using the specified character encoding. |
| * |
| * @param input the string to convert |
| * @param encoding the encoding to use, null means platform default |
| * @return an input stream |
| * @since 2.3 |
| */ |
| public static InputStream toInputStream(final String input, final Charset encoding) { |
| return new ByteArrayInputStream(input.getBytes(Charsets.toCharset(encoding))); |
| } |
| |
| /** |
| * Converts the specified string to an input stream, encoded as bytes |
| * using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * |
| * @param input the string to convert |
| * @param encoding the encoding to use, null means platform default |
| * @return an input stream |
| * @throws IOException if the encoding is invalid |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 1.1 |
| */ |
| public static InputStream toInputStream(final String input, final String encoding) throws IOException { |
| final byte[] bytes = input.getBytes(Charsets.toCharset(encoding)); |
| return new ByteArrayInputStream(bytes); |
| } |
| |
| // write byte[] |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Writes bytes from a <code>byte[]</code> to an <code>OutputStream</code>. |
| * |
| * @param data the byte array to write, do not modify during output, |
| * null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| */ |
| public static void write(final byte[] data, final OutputStream output) |
| throws IOException { |
| if (data != null) { |
| output.write(data); |
| } |
| } |
| |
| /** |
| * Writes bytes from a <code>byte[]</code> to an <code>OutputStream</code> using chunked writes. |
| * This is intended for writing very large byte arrays which might otherwise cause excessive |
| * memory usage if the native code has to allocate a copy. |
| * |
| * @param data the byte array to write, do not modify during output, |
| * null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.5 |
| */ |
| public static void writeChunked(final byte[] data, final OutputStream output) |
| throws IOException { |
| if (data != null) { |
| int bytes = data.length; |
| int offset = 0; |
| while (bytes > 0) { |
| int chunk = Math.min(bytes, DEFAULT_BUFFER_SIZE); |
| output.write(data, offset, chunk); |
| bytes -= chunk; |
| offset += chunk; |
| } |
| } |
| } |
| |
| /** |
| * Writes bytes from a <code>byte[]</code> to chars on a <code>Writer</code> |
| * using the default character encoding of the platform. |
| * <p> |
| * This method uses {@link String#String(byte[])}. |
| * |
| * @param data the byte array to write, do not modify during output, |
| * null ignored |
| * @param output the <code>Writer</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| * @deprecated 2.5 use {@link #write(byte[], Writer, Charset)} instead |
| */ |
| @Deprecated |
| public static void write(final byte[] data, final Writer output) throws IOException { |
| write(data, output, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Writes bytes from a <code>byte[]</code> to chars on a <code>Writer</code> |
| * using the specified character encoding. |
| * <p> |
| * This method uses {@link String#String(byte[], String)}. |
| * |
| * @param data the byte array to write, do not modify during output, |
| * null ignored |
| * @param output the <code>Writer</code> to write to |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static void write(final byte[] data, final Writer output, final Charset encoding) throws IOException { |
| if (data != null) { |
| output.write(new String(data, Charsets.toCharset(encoding))); |
| } |
| } |
| |
| /** |
| * Writes bytes from a <code>byte[]</code> to chars on a <code>Writer</code> |
| * using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * This method uses {@link String#String(byte[], String)}. |
| * |
| * @param data the byte array to write, do not modify during output, |
| * null ignored |
| * @param output the <code>Writer</code> to write to |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 1.1 |
| */ |
| public static void write(final byte[] data, final Writer output, final String encoding) throws IOException { |
| write(data, output, Charsets.toCharset(encoding)); |
| } |
| |
| // write char[] |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Writes chars from a <code>char[]</code> to a <code>Writer</code> |
| * |
| * @param data the char array to write, do not modify during output, |
| * null ignored |
| * @param output the <code>Writer</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| */ |
| public static void write(final char[] data, final Writer output) throws IOException { |
| if (data != null) { |
| output.write(data); |
| } |
| } |
| |
| /** |
| * Writes chars from a <code>char[]</code> to a <code>Writer</code> using chunked writes. |
| * This is intended for writing very large byte arrays which might otherwise cause excessive |
| * memory usage if the native code has to allocate a copy. |
| * |
| * @param data the char array to write, do not modify during output, |
| * null ignored |
| * @param output the <code>Writer</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.5 |
| */ |
| public static void writeChunked(final char[] data, final Writer output) throws IOException { |
| if (data != null) { |
| int bytes = data.length; |
| int offset = 0; |
| while (bytes > 0) { |
| int chunk = Math.min(bytes, DEFAULT_BUFFER_SIZE); |
| output.write(data, offset, chunk); |
| bytes -= chunk; |
| offset += chunk; |
| } |
| } |
| } |
| |
| /** |
| * Writes chars from a <code>char[]</code> to bytes on an |
| * <code>OutputStream</code>. |
| * <p> |
| * This method uses {@link String#String(char[])} and |
| * {@link String#getBytes()}. |
| * |
| * @param data the char array to write, do not modify during output, |
| * null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| * @deprecated 2.5 use {@link #write(char[], OutputStream, Charset)} instead |
| */ |
| @Deprecated |
| public static void write(final char[] data, final OutputStream output) |
| throws IOException { |
| write(data, output, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Writes chars from a <code>char[]</code> to bytes on an |
| * <code>OutputStream</code> using the specified character encoding. |
| * <p> |
| * This method uses {@link String#String(char[])} and |
| * {@link String#getBytes(String)}. |
| * |
| * @param data the char array to write, do not modify during output, |
| * null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static void write(final char[] data, final OutputStream output, final Charset encoding) throws IOException { |
| if (data != null) { |
| output.write(new String(data).getBytes(Charsets.toCharset(encoding))); |
| } |
| } |
| |
| /** |
| * Writes chars from a <code>char[]</code> to bytes on an |
| * <code>OutputStream</code> using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * This method uses {@link String#String(char[])} and |
| * {@link String#getBytes(String)}. |
| * |
| * @param data the char array to write, do not modify during output, |
| * null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the encoding is not supported. |
| * @since 1.1 |
| */ |
| public static void write(final char[] data, final OutputStream output, final String encoding) |
| throws IOException { |
| write(data, output, Charsets.toCharset(encoding)); |
| } |
| |
| // write CharSequence |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Writes chars from a <code>CharSequence</code> to a <code>Writer</code>. |
| * |
| * @param data the <code>CharSequence</code> to write, null ignored |
| * @param output the <code>Writer</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.0 |
| */ |
| public static void write(final CharSequence data, final Writer output) throws IOException { |
| if (data != null) { |
| write(data.toString(), output); |
| } |
| } |
| |
| /** |
| * Writes chars from a <code>CharSequence</code> to bytes on an |
| * <code>OutputStream</code> using the default character encoding of the |
| * platform. |
| * <p> |
| * This method uses {@link String#getBytes()}. |
| * |
| * @param data the <code>CharSequence</code> to write, null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.0 |
| * @deprecated 2.5 use {@link #write(CharSequence, OutputStream, Charset)} instead |
| */ |
| @Deprecated |
| public static void write(final CharSequence data, final OutputStream output) |
| throws IOException { |
| write(data, output, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Writes chars from a <code>CharSequence</code> to bytes on an |
| * <code>OutputStream</code> using the specified character encoding. |
| * <p> |
| * This method uses {@link String#getBytes(String)}. |
| * |
| * @param data the <code>CharSequence</code> to write, null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static void write(final CharSequence data, final OutputStream output, final Charset encoding) |
| throws IOException { |
| if (data != null) { |
| write(data.toString(), output, encoding); |
| } |
| } |
| |
| /** |
| * Writes chars from a <code>CharSequence</code> to bytes on an |
| * <code>OutputStream</code> using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * This method uses {@link String#getBytes(String)}. |
| * |
| * @param data the <code>CharSequence</code> to write, null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the encoding is not supported. |
| * @since 2.0 |
| */ |
| public static void write(final CharSequence data, final OutputStream output, final String encoding) |
| throws IOException { |
| write(data, output, Charsets.toCharset(encoding)); |
| } |
| |
| // write String |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Writes chars from a <code>String</code> to a <code>Writer</code>. |
| * |
| * @param data the <code>String</code> to write, null ignored |
| * @param output the <code>Writer</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| */ |
| public static void write(final String data, final Writer output) throws IOException { |
| if (data != null) { |
| output.write(data); |
| } |
| } |
| |
| /** |
| * Writes chars from a <code>String</code> to bytes on an |
| * <code>OutputStream</code> using the default character encoding of the |
| * platform. |
| * <p> |
| * This method uses {@link String#getBytes()}. |
| * |
| * @param data the <code>String</code> to write, null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| * @deprecated 2.5 use {@link #write(String, OutputStream, Charset)} instead |
| */ |
| @Deprecated |
| public static void write(final String data, final OutputStream output) |
| throws IOException { |
| write(data, output, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Writes chars from a <code>String</code> to bytes on an |
| * <code>OutputStream</code> using the specified character encoding. |
| * <p> |
| * This method uses {@link String#getBytes(String)}. |
| * |
| * @param data the <code>String</code> to write, null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static void write(final String data, final OutputStream output, final Charset encoding) throws IOException { |
| if (data != null) { |
| output.write(data.getBytes(Charsets.toCharset(encoding))); |
| } |
| } |
| |
| /** |
| * Writes chars from a <code>String</code> to bytes on an |
| * <code>OutputStream</code> using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * This method uses {@link String#getBytes(String)}. |
| * |
| * @param data the <code>String</code> to write, null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the encoding is not supported. |
| * @since 1.1 |
| */ |
| public static void write(final String data, final OutputStream output, final String encoding) |
| throws IOException { |
| write(data, output, Charsets.toCharset(encoding)); |
| } |
| |
| // write StringBuffer |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Writes chars from a <code>StringBuffer</code> to a <code>Writer</code>. |
| * |
| * @param data the <code>StringBuffer</code> to write, null ignored |
| * @param output the <code>Writer</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| * @deprecated replaced by write(CharSequence, Writer) |
| */ |
| @Deprecated |
| public static void write(final StringBuffer data, final Writer output) |
| throws IOException { |
| if (data != null) { |
| output.write(data.toString()); |
| } |
| } |
| |
| /** |
| * Writes chars from a <code>StringBuffer</code> to bytes on an |
| * <code>OutputStream</code> using the default character encoding of the |
| * platform. |
| * <p> |
| * This method uses {@link String#getBytes()}. |
| * |
| * @param data the <code>StringBuffer</code> to write, null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| * @deprecated replaced by write(CharSequence, OutputStream) |
| */ |
| @Deprecated |
| public static void write(final StringBuffer data, final OutputStream output) |
| throws IOException { |
| write(data, output, (String) null); |
| } |
| |
| /** |
| * Writes chars from a <code>StringBuffer</code> to bytes on an |
| * <code>OutputStream</code> using the specified character encoding. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * This method uses {@link String#getBytes(String)}. |
| * |
| * @param data the <code>StringBuffer</code> to write, null ignored |
| * @param output the <code>OutputStream</code> to write to |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if output is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the encoding is not supported. |
| * @since 1.1 |
| * @deprecated replaced by write(CharSequence, OutputStream, String) |
| */ |
| @Deprecated |
| public static void write(final StringBuffer data, final OutputStream output, final String encoding) |
| throws IOException { |
| if (data != null) { |
| output.write(data.toString().getBytes(Charsets.toCharset(encoding))); |
| } |
| } |
| |
| // writeLines |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Writes the <code>toString()</code> value of each item in a collection to |
| * an <code>OutputStream</code> line by line, using the default character |
| * encoding of the platform and the specified line ending. |
| * |
| * @param lines the lines to write, null entries produce blank lines |
| * @param lineEnding the line separator to use, null is system default |
| * @param output the <code>OutputStream</code> to write to, not null, not closed |
| * @throws NullPointerException if the output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| * @deprecated 2.5 use {@link #writeLines(Collection, String, OutputStream, Charset)} instead |
| */ |
| @Deprecated |
| public static void writeLines(final Collection<?> lines, final String lineEnding, |
| final OutputStream output) throws IOException { |
| writeLines(lines, lineEnding, output, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Writes the <code>toString()</code> value of each item in a collection to |
| * an <code>OutputStream</code> line by line, using the specified character |
| * encoding and the specified line ending. |
| * |
| * @param lines the lines to write, null entries produce blank lines |
| * @param lineEnding the line separator to use, null is system default |
| * @param output the <code>OutputStream</code> to write to, not null, not closed |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if the output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static void writeLines(final Collection<?> lines, String lineEnding, final OutputStream output, |
| final Charset encoding) throws IOException { |
| if (lines == null) { |
| return; |
| } |
| if (lineEnding == null) { |
| lineEnding = LINE_SEPARATOR; |
| } |
| final Charset cs = Charsets.toCharset(encoding); |
| for (final Object line : lines) { |
| if (line != null) { |
| output.write(line.toString().getBytes(cs)); |
| } |
| output.write(lineEnding.getBytes(cs)); |
| } |
| } |
| |
| /** |
| * Writes the <code>toString()</code> value of each item in a collection to |
| * an <code>OutputStream</code> line by line, using the specified character |
| * encoding and the specified line ending. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * |
| * @param lines the lines to write, null entries produce blank lines |
| * @param lineEnding the line separator to use, null is system default |
| * @param output the <code>OutputStream</code> to write to, not null, not closed |
| * @param encoding the encoding to use, null means platform default |
| * @throws NullPointerException if the output is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 1.1 |
| */ |
| public static void writeLines(final Collection<?> lines, final String lineEnding, |
| final OutputStream output, final String encoding) throws IOException { |
| writeLines(lines, lineEnding, output, Charsets.toCharset(encoding)); |
| } |
| |
| /** |
| * Writes the <code>toString()</code> value of each item in a collection to |
| * a <code>Writer</code> line by line, using the specified line ending. |
| * |
| * @param lines the lines to write, null entries produce blank lines |
| * @param lineEnding the line separator to use, null is system default |
| * @param writer the <code>Writer</code> to write to, not null, not closed |
| * @throws NullPointerException if the input is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| */ |
| public static void writeLines(final Collection<?> lines, String lineEnding, |
| final Writer writer) throws IOException { |
| if (lines == null) { |
| return; |
| } |
| if (lineEnding == null) { |
| lineEnding = LINE_SEPARATOR; |
| } |
| for (final Object line : lines) { |
| if (line != null) { |
| writer.write(line.toString()); |
| } |
| writer.write(lineEnding); |
| } |
| } |
| |
| // copy from InputStream |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Copies bytes from an <code>InputStream</code> to an |
| * <code>OutputStream</code>. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * <p> |
| * Large streams (over 2GB) will return a bytes copied value of |
| * <code>-1</code> after the copy has completed since the correct |
| * number of bytes cannot be returned as an int. For large streams |
| * use the <code>copyLarge(InputStream, OutputStream)</code> method. |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param output the <code>OutputStream</code> to write to |
| * @return the number of bytes copied, or -1 if > Integer.MAX_VALUE |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| */ |
| public static int copy(final InputStream input, final OutputStream output) throws IOException { |
| final long count = copyLarge(input, output); |
| if (count > Integer.MAX_VALUE) { |
| return -1; |
| } |
| return (int) count; |
| } |
| |
| /** |
| * Copies bytes from an <code>InputStream</code> to an <code>OutputStream</code> using an internal buffer of the |
| * given size. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a <code>BufferedInputStream</code>. |
| * <p> |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param output the <code>OutputStream</code> to write to |
| * @param bufferSize the bufferSize used to copy from the input to the output |
| * @return the number of bytes copied |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.5 |
| */ |
| public static long copy(final InputStream input, final OutputStream output, final int bufferSize) |
| throws IOException { |
| return copyLarge(input, output, new byte[bufferSize]); |
| } |
| |
| /** |
| * Copies bytes from a large (over 2GB) <code>InputStream</code> to an |
| * <code>OutputStream</code>. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * <p> |
| * The buffer size is given by {@link #DEFAULT_BUFFER_SIZE}. |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param output the <code>OutputStream</code> to write to |
| * @return the number of bytes copied |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.3 |
| */ |
| public static long copyLarge(final InputStream input, final OutputStream output) |
| throws IOException { |
| return copy(input, output, DEFAULT_BUFFER_SIZE); |
| } |
| |
| /** |
| * Copies bytes from a large (over 2GB) <code>InputStream</code> to an |
| * <code>OutputStream</code>. |
| * <p> |
| * This method uses the provided buffer, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * <p> |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param output the <code>OutputStream</code> to write to |
| * @param buffer the buffer to use for the copy |
| * @return the number of bytes copied |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.2 |
| */ |
| public static long copyLarge(final InputStream input, final OutputStream output, final byte[] buffer) |
| throws IOException { |
| long count = 0; |
| int n; |
| while (EOF != (n = input.read(buffer))) { |
| output.write(buffer, 0, n); |
| count += n; |
| } |
| return count; |
| } |
| |
| /** |
| * Copies some or all bytes from a large (over 2GB) <code>InputStream</code> to an |
| * <code>OutputStream</code>, optionally skipping input bytes. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * </p> |
| * <p> |
| * Note that the implementation uses {@link #skip(InputStream, long)}. |
| * This means that the method may be considerably less efficient than using the actual skip implementation, |
| * this is done to guarantee that the correct number of characters are skipped. |
| * </p> |
| * The buffer size is given by {@link #DEFAULT_BUFFER_SIZE}. |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param output the <code>OutputStream</code> to write to |
| * @param inputOffset : number of bytes to skip from input before copying |
| * -ve values are ignored |
| * @param length : number of bytes to copy. -ve means all |
| * @return the number of bytes copied |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.2 |
| */ |
| public static long copyLarge(final InputStream input, final OutputStream output, final long inputOffset, |
| final long length) throws IOException { |
| return copyLarge(input, output, inputOffset, length, new byte[DEFAULT_BUFFER_SIZE]); |
| } |
| |
| /** |
| * Copies some or all bytes from a large (over 2GB) <code>InputStream</code> to an |
| * <code>OutputStream</code>, optionally skipping input bytes. |
| * <p> |
| * This method uses the provided buffer, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * </p> |
| * <p> |
| * Note that the implementation uses {@link #skip(InputStream, long)}. |
| * This means that the method may be considerably less efficient than using the actual skip implementation, |
| * this is done to guarantee that the correct number of characters are skipped. |
| * </p> |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param output the <code>OutputStream</code> to write to |
| * @param inputOffset : number of bytes to skip from input before copying |
| * -ve values are ignored |
| * @param length : number of bytes to copy. -ve means all |
| * @param buffer the buffer to use for the copy |
| * @return the number of bytes copied |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.2 |
| */ |
| public static long copyLarge(final InputStream input, final OutputStream output, |
| final long inputOffset, final long length, final byte[] buffer) throws IOException { |
| if (inputOffset > 0) { |
| skipFully(input, inputOffset); |
| } |
| if (length == 0) { |
| return 0; |
| } |
| final int bufferLength = buffer.length; |
| int bytesToRead = bufferLength; |
| if (length > 0 && length < bufferLength) { |
| bytesToRead = (int) length; |
| } |
| int read; |
| long totalRead = 0; |
| while (bytesToRead > 0 && EOF != (read = input.read(buffer, 0, bytesToRead))) { |
| output.write(buffer, 0, read); |
| totalRead += read; |
| if (length > 0) { // only adjust length if not reading to the end |
| // Note the cast must work because buffer.length is an integer |
| bytesToRead = (int) Math.min(length - totalRead, bufferLength); |
| } |
| } |
| return totalRead; |
| } |
| |
| /** |
| * Copies bytes from an <code>InputStream</code> to chars on a |
| * <code>Writer</code> using the default character encoding of the platform. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * <p> |
| * This method uses {@link InputStreamReader}. |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param output the <code>Writer</code> to write to |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| * @deprecated 2.5 use {@link #copy(InputStream, Writer, Charset)} instead |
| */ |
| @Deprecated |
| public static void copy(final InputStream input, final Writer output) |
| throws IOException { |
| copy(input, output, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Copies bytes from an <code>InputStream</code> to chars on a |
| * <code>Writer</code> using the specified character encoding. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * <p> |
| * This method uses {@link InputStreamReader}. |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param output the <code>Writer</code> to write to |
| * @param inputEncoding the encoding to use for the input stream, null means platform default |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static void copy(final InputStream input, final Writer output, final Charset inputEncoding) |
| throws IOException { |
| final InputStreamReader in = new InputStreamReader(input, Charsets.toCharset(inputEncoding)); |
| copy(in, output); |
| } |
| |
| /** |
| * Copies bytes from an <code>InputStream</code> to chars on a |
| * <code>Writer</code> using the specified character encoding. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedInputStream</code>. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * This method uses {@link InputStreamReader}. |
| * |
| * @param input the <code>InputStream</code> to read from |
| * @param output the <code>Writer</code> to write to |
| * @param inputEncoding the encoding to use for the InputStream, null means platform default |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 1.1 |
| */ |
| public static void copy(final InputStream input, final Writer output, final String inputEncoding) |
| throws IOException { |
| copy(input, output, Charsets.toCharset(inputEncoding)); |
| } |
| |
| // copy from Reader |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Copies chars from a <code>Reader</code> to a <code>Writer</code>. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * <p> |
| * Large streams (over 2GB) will return a chars copied value of |
| * <code>-1</code> after the copy has completed since the correct |
| * number of chars cannot be returned as an int. For large streams |
| * use the <code>copyLarge(Reader, Writer)</code> method. |
| * |
| * @param input the <code>Reader</code> to read from |
| * @param output the <code>Writer</code> to write to |
| * @return the number of characters copied, or -1 if > Integer.MAX_VALUE |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| */ |
| public static int copy(final Reader input, final Writer output) throws IOException { |
| final long count = copyLarge(input, output); |
| if (count > Integer.MAX_VALUE) { |
| return -1; |
| } |
| return (int) count; |
| } |
| |
| /** |
| * Copies chars from a large (over 2GB) <code>Reader</code> to a <code>Writer</code>. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * <p> |
| * The buffer size is given by {@link #DEFAULT_BUFFER_SIZE}. |
| * |
| * @param input the <code>Reader</code> to read from |
| * @param output the <code>Writer</code> to write to |
| * @return the number of characters copied |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.3 |
| */ |
| public static long copyLarge(final Reader input, final Writer output) throws IOException { |
| return copyLarge(input, output, new char[DEFAULT_BUFFER_SIZE]); |
| } |
| |
| /** |
| * Copies chars from a large (over 2GB) <code>Reader</code> to a <code>Writer</code>. |
| * <p> |
| * This method uses the provided buffer, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * <p> |
| * |
| * @param input the <code>Reader</code> to read from |
| * @param output the <code>Writer</code> to write to |
| * @param buffer the buffer to be used for the copy |
| * @return the number of characters copied |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.2 |
| */ |
| public static long copyLarge(final Reader input, final Writer output, final char[] buffer) throws IOException { |
| long count = 0; |
| int n; |
| while (EOF != (n = input.read(buffer))) { |
| output.write(buffer, 0, n); |
| count += n; |
| } |
| return count; |
| } |
| |
| /** |
| * Copies some or all chars from a large (over 2GB) <code>InputStream</code> to an |
| * <code>OutputStream</code>, optionally skipping input chars. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * <p> |
| * The buffer size is given by {@link #DEFAULT_BUFFER_SIZE}. |
| * |
| * @param input the <code>Reader</code> to read from |
| * @param output the <code>Writer</code> to write to |
| * @param inputOffset : number of chars to skip from input before copying |
| * -ve values are ignored |
| * @param length : number of chars to copy. -ve means all |
| * @return the number of chars copied |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.2 |
| */ |
| public static long copyLarge(final Reader input, final Writer output, final long inputOffset, final long length) |
| throws IOException { |
| return copyLarge(input, output, inputOffset, length, new char[DEFAULT_BUFFER_SIZE]); |
| } |
| |
| /** |
| * Copies some or all chars from a large (over 2GB) <code>InputStream</code> to an |
| * <code>OutputStream</code>, optionally skipping input chars. |
| * <p> |
| * This method uses the provided buffer, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * <p> |
| * |
| * @param input the <code>Reader</code> to read from |
| * @param output the <code>Writer</code> to write to |
| * @param inputOffset : number of chars to skip from input before copying |
| * -ve values are ignored |
| * @param length : number of chars to copy. -ve means all |
| * @param buffer the buffer to be used for the copy |
| * @return the number of chars copied |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.2 |
| */ |
| public static long copyLarge(final Reader input, final Writer output, final long inputOffset, final long length, |
| final char[] buffer) |
| throws IOException { |
| if (inputOffset > 0) { |
| skipFully(input, inputOffset); |
| } |
| if (length == 0) { |
| return 0; |
| } |
| int bytesToRead = buffer.length; |
| if (length > 0 && length < buffer.length) { |
| bytesToRead = (int) length; |
| } |
| int read; |
| long totalRead = 0; |
| while (bytesToRead > 0 && EOF != (read = input.read(buffer, 0, bytesToRead))) { |
| output.write(buffer, 0, read); |
| totalRead += read; |
| if (length > 0) { // only adjust length if not reading to the end |
| // Note the cast must work because buffer.length is an integer |
| bytesToRead = (int) Math.min(length - totalRead, buffer.length); |
| } |
| } |
| return totalRead; |
| } |
| |
| /** |
| * Copies chars from a <code>Reader</code> to bytes on an |
| * <code>OutputStream</code> using the default character encoding of the |
| * platform, and calling flush. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * <p> |
| * Due to the implementation of OutputStreamWriter, this method performs a |
| * flush. |
| * <p> |
| * This method uses {@link OutputStreamWriter}. |
| * |
| * @param input the <code>Reader</code> to read from |
| * @param output the <code>OutputStream</code> to write to |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| * @deprecated 2.5 use {@link #copy(Reader, OutputStream, Charset)} instead |
| */ |
| @Deprecated |
| public static void copy(final Reader input, final OutputStream output) |
| throws IOException { |
| copy(input, output, Charset.defaultCharset()); |
| } |
| |
| /** |
| * Copies chars from a <code>Reader</code> to bytes on an |
| * <code>OutputStream</code> using the specified character encoding, and |
| * calling flush. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * </p> |
| * <p> |
| * Due to the implementation of OutputStreamWriter, this method performs a |
| * flush. |
| * </p> |
| * <p> |
| * This method uses {@link OutputStreamWriter}. |
| * </p> |
| * |
| * @param input the <code>Reader</code> to read from |
| * @param output the <code>OutputStream</code> to write to |
| * @param outputEncoding the encoding to use for the OutputStream, null means platform default |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.3 |
| */ |
| public static void copy(final Reader input, final OutputStream output, final Charset outputEncoding) |
| throws IOException { |
| final OutputStreamWriter out = new OutputStreamWriter(output, Charsets.toCharset(outputEncoding)); |
| copy(input, out); |
| // XXX Unless anyone is planning on rewriting OutputStreamWriter, |
| // we have to flush here. |
| out.flush(); |
| } |
| |
| /** |
| * Copies chars from a <code>Reader</code> to bytes on an |
| * <code>OutputStream</code> using the specified character encoding, and |
| * calling flush. |
| * <p> |
| * This method buffers the input internally, so there is no need to use a |
| * <code>BufferedReader</code>. |
| * <p> |
| * Character encoding names can be found at |
| * <a href="http://www.iana.org/assignments/character-sets">IANA</a>. |
| * <p> |
| * Due to the implementation of OutputStreamWriter, this method performs a |
| * flush. |
| * <p> |
| * This method uses {@link OutputStreamWriter}. |
| * |
| * @param input the <code>Reader</code> to read from |
| * @param output the <code>OutputStream</code> to write to |
| * @param outputEncoding the encoding to use for the OutputStream, null means platform default |
| * @throws NullPointerException if the input or output is null |
| * @throws IOException if an I/O error occurs |
| * @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io |
| * .UnsupportedEncodingException} in version 2.2 if the |
| * encoding is not supported. |
| * @since 1.1 |
| */ |
| public static void copy(final Reader input, final OutputStream output, final String outputEncoding) |
| throws IOException { |
| copy(input, output, Charsets.toCharset(outputEncoding)); |
| } |
| |
| // content equals |
| //----------------------------------------------------------------------- |
| |
| /** |
| * Compares the contents of two Streams to determine if they are equal or |
| * not. |
| * <p> |
| * This method buffers the input internally using |
| * <code>BufferedInputStream</code> if they are not already buffered. |
| * |
| * @param input1 the first stream |
| * @param input2 the second stream |
| * @return true if the content of the streams are equal or they both don't |
| * exist, false otherwise |
| * @throws NullPointerException if either input is null |
| * @throws IOException if an I/O error occurs |
| */ |
| public static boolean contentEquals(InputStream input1, InputStream input2) |
| throws IOException { |
| if (input1 == input2) { |
| return true; |
| } |
| if (!(input1 instanceof BufferedInputStream)) { |
| input1 = new BufferedInputStream(input1); |
| } |
| if (!(input2 instanceof BufferedInputStream)) { |
| input2 = new BufferedInputStream(input2); |
| } |
| |
| int ch = input1.read(); |
| while (EOF != ch) { |
| final int ch2 = input2.read(); |
| if (ch != ch2) { |
| return false; |
| } |
| ch = input1.read(); |
| } |
| |
| final int ch2 = input2.read(); |
| return ch2 == EOF; |
| } |
| |
| /** |
| * Compares the contents of two Readers to determine if they are equal or |
| * not. |
| * <p> |
| * This method buffers the input internally using |
| * <code>BufferedReader</code> if they are not already buffered. |
| * |
| * @param input1 the first reader |
| * @param input2 the second reader |
| * @return true if the content of the readers are equal or they both don't |
| * exist, false otherwise |
| * @throws NullPointerException if either input is null |
| * @throws IOException if an I/O error occurs |
| * @since 1.1 |
| */ |
| public static boolean contentEquals(Reader input1, Reader input2) |
| throws IOException { |
| if (input1 == input2) { |
| return true; |
| } |
| |
| input1 = toBufferedReader(input1); |
| input2 = toBufferedReader(input2); |
| |
| int ch = input1.read(); |
| while (EOF != ch) { |
| final int ch2 = input2.read(); |
| if (ch != ch2) { |
| return false; |
| } |
| ch = input1.read(); |
| } |
| |
| final int ch2 = input2.read(); |
| return ch2 == EOF; |
| } |
| |
| /** |
| * Compares the contents of two Readers to determine if they are equal or |
| * not, ignoring EOL characters. |
| * <p> |
| * This method buffers the input internally using |
| * <code>BufferedReader</code> if they are not already buffered. |
| * |
| * @param input1 the first reader |
| * @param input2 the second reader |
| * @return true if the content of the readers are equal (ignoring EOL differences), false otherwise |
| * @throws NullPointerException if either input is null |
| * @throws IOException if an I/O error occurs |
| * @since 2.2 |
| */ |
| public static boolean contentEqualsIgnoreEOL(final Reader input1, final Reader input2) |
| throws IOException { |
| if (input1 == input2) { |
| return true; |
| } |
| final BufferedReader br1 = toBufferedReader(input1); |
| final BufferedReader br2 = toBufferedReader(input2); |
| |
| String line1 = br1.readLine(); |
| String line2 = br2.readLine(); |
| while (line1 != null && line2 != null && line1.equals(line2)) { |
| line1 = br1.readLine(); |
| line2 = br2.readLine(); |
| } |
| return line1 == null ? line2 == null ? true : false : line1.equals(line2); |
| } |
| |
| /** |
| * Skips bytes from an input byte stream. |
| * This implementation guarantees that it will read as many bytes |
| * as possible before giving up; this may not always be the case for |
| * skip() implementations in subclasses of {@link InputStream}. |
| * <p> |
| * Note that the implementation uses {@link InputStream#read(byte[], int, int)} rather |
| * than delegating to {@link InputStream#skip(long)}. |
| * This means that the method may be considerably less efficient than using the actual skip implementation, |
| * this is done to guarantee that the correct number of bytes are skipped. |
| * </p> |
| * |
| * @param input byte stream to skip |
| * @param toSkip number of bytes to skip. |
| * @return number of bytes actually skipped. |
| * @throws IOException if there is a problem reading the file |
| * @throws IllegalArgumentException if toSkip is negative |
| * @see InputStream#skip(long) |
| * @see <a href="https://issues.apache.org/jira/browse/IO-203">IO-203 - Add skipFully() method for InputStreams</a> |
| * @since 2.0 |
| */ |
| public static long skip(final InputStream input, final long toSkip) throws IOException { |
| if (toSkip < 0) { |
| throw new IllegalArgumentException("Skip count must be non-negative, actual: " + toSkip); |
| } |
| /* |
| * N.B. no need to synchronize this because: - we don't care if the buffer is created multiple times (the data |
| * is ignored) - we always use the same size buffer, so if it it is recreated it will still be OK (if the buffer |
| * size were variable, we would need to synch. to ensure some other thread did not create a smaller one) |
| */ |
| if (SKIP_BYTE_BUFFER == null) { |
| SKIP_BYTE_BUFFER = new byte[SKIP_BUFFER_SIZE]; |
| } |
| long remain = toSkip; |
| while (remain > 0) { |
| // See https://issues.apache.org/jira/browse/IO-203 for why we use read() rather than delegating to skip() |
| final long n = input.read(SKIP_BYTE_BUFFER, 0, (int) Math.min(remain, SKIP_BUFFER_SIZE)); |
| if (n < 0) { // EOF |
| break; |
| } |
| remain -= n; |
| } |
| return toSkip - remain; |
| } |
| |
| /** |
| * Skips bytes from a ReadableByteChannel. |
| * This implementation guarantees that it will read as many bytes |
| * as possible before giving up. |
| * |
| * @param input ReadableByteChannel to skip |
| * @param toSkip number of bytes to skip. |
| * @return number of bytes actually skipped. |
| * @throws IOException if there is a problem reading the ReadableByteChannel |
| * @throws IllegalArgumentException if toSkip is negative |
| * @since 2.5 |
| */ |
| public static long skip(final ReadableByteChannel input, final long toSkip) throws IOException { |
| if (toSkip < 0) { |
| throw new IllegalArgumentException("Skip count must be non-negative, actual: " + toSkip); |
| } |
| final ByteBuffer skipByteBuffer = ByteBuffer.allocate((int) Math.min(toSkip, SKIP_BUFFER_SIZE)); |
| long remain = toSkip; |
| while (remain > 0) { |
| skipByteBuffer.position(0); |
| skipByteBuffer.limit((int) Math.min(remain, SKIP_BUFFER_SIZE)); |
| final int n = input.read(skipByteBuffer); |
| if (n == EOF) { |
| break; |
| } |
| remain -= n; |
| } |
| return toSkip - remain; |
| } |
| |
| /** |
| * Skips characters from an input character stream. |
| * This implementation guarantees that it will read as many characters |
| * as possible before giving up; this may not always be the case for |
| * skip() implementations in subclasses of {@link Reader}. |
| * <p> |
| * Note that the implementation uses {@link Reader#read(char[], int, int)} rather |
| * than delegating to {@link Reader#skip(long)}. |
| * This means that the method may be considerably less efficient than using the actual skip implementation, |
| * this is done to guarantee that the correct number of characters are skipped. |
| * </p> |
| * |
| * @param input character stream to skip |
| * @param toSkip number of characters to skip. |
| * @return number of characters actually skipped. |
| * @throws IOException if there is a problem reading the file |
| * @throws IllegalArgumentException if toSkip is negative |
| * @see Reader#skip(long) |
| * @see <a href="https://issues.apache.org/jira/browse/IO-203">IO-203 - Add skipFully() method for InputStreams</a> |
| * @since 2.0 |
| */ |
| public static long skip(final Reader input, final long toSkip) throws IOException { |
| if (toSkip < 0) { |
| throw new IllegalArgumentException("Skip count must be non-negative, actual: " + toSkip); |
| } |
| /* |
| * N.B. no need to synchronize this because: - we don't care if the buffer is created multiple times (the data |
| * is ignored) - we always use the same size buffer, so if it it is recreated it will still be OK (if the buffer |
| * size were variable, we would need to synch. to ensure some other thread did not create a smaller one) |
| */ |
| if (SKIP_CHAR_BUFFER == null) { |
| SKIP_CHAR_BUFFER = new char[SKIP_BUFFER_SIZE]; |
| } |
| long remain = toSkip; |
| while (remain > 0) { |
| // See https://issues.apache.org/jira/browse/IO-203 for why we use read() rather than delegating to skip() |
| final long n = input.read(SKIP_CHAR_BUFFER, 0, (int) Math.min(remain, SKIP_BUFFER_SIZE)); |
| if (n < 0) { // EOF |
| break; |
| } |
| remain -= n; |
| } |
| return toSkip - remain; |
| } |
| |
| /** |
| * Skips the requested number of bytes or fail if there are not enough left. |
| * <p> |
| * This allows for the possibility that {@link InputStream#skip(long)} may |
| * not skip as many bytes as requested (most likely because of reaching EOF). |
| * <p> |
| * Note that the implementation uses {@link #skip(InputStream, long)}. |
| * This means that the method may be considerably less efficient than using the actual skip implementation, |
| * this is done to guarantee that the correct number of characters are skipped. |
| * </p> |
| * |
| * @param input stream to skip |
| * @param toSkip the number of bytes to skip |
| * @throws IOException if there is a problem reading the file |
| * @throws IllegalArgumentException if toSkip is negative |
| * @throws EOFException if the number of bytes skipped was incorrect |
| * @see InputStream#skip(long) |
| * @since 2.0 |
| */ |
| public static void skipFully(final InputStream input, final long toSkip) throws IOException { |
| if (toSkip < 0) { |
| throw new IllegalArgumentException("Bytes to skip must not be negative: " + toSkip); |
| } |
| final long skipped = skip(input, toSkip); |
| if (skipped != toSkip) { |
| throw new EOFException("Bytes to skip: " + toSkip + " actual: " + skipped); |
| } |
| } |
| |
| /** |
| * Skips the requested number of bytes or fail if there are not enough left. |
| * |
| * @param input ReadableByteChannel to skip |
| * @param toSkip the number of bytes to skip |
| * @throws IOException if there is a problem reading the ReadableByteChannel |
| * @throws IllegalArgumentException if toSkip is negative |
| * @throws EOFException if the number of bytes skipped was incorrect |
| * @since 2.5 |
| */ |
| public static void skipFully(final ReadableByteChannel input, final long toSkip) throws IOException { |
| if (toSkip < 0) { |
| throw new IllegalArgumentException("Bytes to skip must not be negative: " + toSkip); |
| } |
| final long skipped = skip(input, toSkip); |
| if (skipped != toSkip) { |
| throw new EOFException("Bytes to skip: " + toSkip + " actual: " + skipped); |
| } |
| } |
| |
| /** |
| * Skips the requested number of characters or fail if there are not enough left. |
| * <p> |
| * This allows for the possibility that {@link Reader#skip(long)} may |
| * not skip as many characters as requested (most likely because of reaching EOF). |
| * <p> |
| * Note that the implementation uses {@link #skip(Reader, long)}. |
| * This means that the method may be considerably less efficient than using the actual skip implementation, |
| * this is done to guarantee that the correct number of characters are skipped. |
| * </p> |
| * |
| * @param input stream to skip |
| * @param toSkip the number of characters to skip |
| * @throws IOException if there is a problem reading the file |
| * @throws IllegalArgumentException if toSkip is negative |
| * @throws EOFException if the number of characters skipped was incorrect |
| * @see Reader#skip(long) |
| * @since 2.0 |
| */ |
| public static void skipFully(final Reader input, final long toSkip) throws IOException { |
| final long skipped = skip(input, toSkip); |
| if (skipped != toSkip) { |
| throw new EOFException("Chars to skip: " + toSkip + " actual: " + skipped); |
| } |
| } |
| |
| |
| /** |
| * Reads characters from an input character stream. |
| * This implementation guarantees that it will read as many characters |
| * as possible before giving up; this may not always be the case for |
| * subclasses of {@link Reader}. |
| * |
| * @param input where to read input from |
| * @param buffer destination |
| * @param offset initial offset into buffer |
| * @param length length to read, must be >= 0 |
| * @return actual length read; may be less than requested if EOF was reached |
| * @throws IOException if a read error occurs |
| * @since 2.2 |
| */ |
| public static int read(final Reader input, final char[] buffer, final int offset, final int length) |
| throws IOException { |
| if (length < 0) { |
| throw new IllegalArgumentException("Length must not be negative: " + length); |
| } |
| int remaining = length; |
| while (remaining > 0) { |
| final int location = length - remaining; |
| final int count = input.read(buffer, offset + location, remaining); |
| if (EOF == count) { // EOF |
| break; |
| } |
| remaining -= count; |
| } |
| return length - remaining; |
| } |
| |
| /** |
| * Reads characters from an input character stream. |
| * This implementation guarantees that it will read as many characters |
| * as possible before giving up; this may not always be the case for |
| * subclasses of {@link Reader}. |
| * |
| * @param input where to read input from |
| * @param buffer destination |
| * @return actual length read; may be less than requested if EOF was reached |
| * @throws IOException if a read error occurs |
| * @since 2.2 |
| */ |
| public static int read(final Reader input, final char[] buffer) throws IOException { |
| return read(input, buffer, 0, buffer.length); |
| } |
| |
| /** |
| * Reads bytes from an input stream. |
| * This implementation guarantees that it will read as many bytes |
| * as possible before giving up; this may not always be the case for |
| * subclasses of {@link InputStream}. |
| * |
| * @param input where to read input from |
| * @param buffer destination |
| * @param offset initial offset into buffer |
| * @param length length to read, must be >= 0 |
| * @return actual length read; may be less than requested if EOF was reached |
| * @throws IOException if a read error occurs |
| * @since 2.2 |
| */ |
| public static int read(final InputStream input, final byte[] buffer, final int offset, final int length) |
| throws IOException { |
| if (length < 0) { |
| throw new IllegalArgumentException("Length must not be negative: " + length); |
| } |
| int remaining = length; |
| while (remaining > 0) { |
| final int location = length - remaining; |
| final int count = input.read(buffer, offset + location, remaining); |
| if (EOF == count) { // EOF |
| break; |
| } |
| remaining -= count; |
| } |
| return length - remaining; |
| } |
| |
| /** |
| * Reads bytes from an input stream. |
| * This implementation guarantees that it will read as many bytes |
| * as possible before giving up; this may not always be the case for |
| * subclasses of {@link InputStream}. |
| * |
| * @param input where to read input from |
| * @param buffer destination |
| * @return actual length read; may be less than requested if EOF was reached |
| * @throws IOException if a read error occurs |
| * @since 2.2 |
| */ |
| public static int read(final InputStream input, final byte[] buffer) throws IOException { |
| return read(input, buffer, 0, buffer.length); |
| } |
| |
| /** |
| * Reads bytes from a ReadableByteChannel. |
| * <p> |
| * This implementation guarantees that it will read as many bytes |
| * as possible before giving up; this may not always be the case for |
| * subclasses of {@link ReadableByteChannel}. |
| * |
| * @param input the byte channel to read |
| * @param buffer byte buffer destination |
| * @return the actual length read; may be less than requested if EOF was reached |
| * @throws IOException if a read error occurs |
| * @since 2.5 |
| */ |
| public static int read(final ReadableByteChannel input, final ByteBuffer buffer) throws IOException { |
| final int length = buffer.remaining(); |
| while (buffer.remaining() > 0) { |
| final int count = input.read(buffer); |
| if (EOF == count) { // EOF |
| break; |
| } |
| } |
| return length - buffer.remaining(); |
| } |
| |
| /** |
| * Reads the requested number of characters or fail if there are not enough left. |
| * <p> |
| * This allows for the possibility that {@link Reader#read(char[], int, int)} may |
| * not read as many characters as requested (most likely because of reaching EOF). |
| * |
| * @param input where to read input from |
| * @param buffer destination |
| * @param offset initial offset into buffer |
| * @param length length to read, must be >= 0 |
| * @throws IOException if there is a problem reading the file |
| * @throws IllegalArgumentException if length is negative |
| * @throws EOFException if the number of characters read was incorrect |
| * @since 2.2 |
| */ |
| public static void readFully(final Reader input, final char[] buffer, final int offset, final int length) |
| throws IOException { |
| final int actual = read(input, buffer, offset, length); |
| if (actual != length) { |
| throw new EOFException("Length to read: " + length + " actual: " + actual); |
| } |
| } |
| |
| /** |
| * Reads the requested number of characters or fail if there are not enough left. |
| * <p> |
| * This allows for the possibility that {@link Reader#read(char[], int, int)} may |
| * not read as many characters as requested (most likely because of reaching EOF). |
| * |
| * @param input where to read input from |
| * @param buffer destination |
| * @throws IOException if there is a problem reading the file |
| * @throws IllegalArgumentException if length is negative |
| * @throws EOFException if the number of characters read was incorrect |
| * @since 2.2 |
| */ |
| public static void readFully(final Reader input, final char[] buffer) throws IOException { |
| readFully(input, buffer, 0, buffer.length); |
| } |
| |
| /** |
| * Reads the requested number of bytes or fail if there are not enough left. |
| * <p> |
| * This allows for the possibility that {@link InputStream#read(byte[], int, int)} may |
| * not read as many bytes as requested (most likely because of reaching EOF). |
| * |
| * @param input where to read input from |
| * @param buffer destination |
| * @param offset initial offset into buffer |
| * @param length length to read, must be >= 0 |
| * @throws IOException if there is a problem reading the file |
| * @throws IllegalArgumentException if length is negative |
| * @throws EOFException if the number of bytes read was incorrect |
| * @since 2.2 |
| */ |
| public static void readFully(final InputStream input, final byte[] buffer, final int offset, final int length) |
| throws IOException { |
| final int actual = read(input, buffer, offset, length); |
| if (actual != length) { |
| throw new EOFException("Length to read: " + length + " actual: " + actual); |
| } |
| } |
| |
| /** |
| * Reads the requested number of bytes or fail if there are not enough left. |
| * <p> |
| * This allows for the possibility that {@link InputStream#read(byte[], int, int)} may |
| * not read as many bytes as requested (most likely because of reaching EOF). |
| * |
| * @param input where to read input from |
| * @param buffer destination |
| * @throws IOException if there is a problem reading the file |
| * @throws IllegalArgumentException if length is negative |
| * @throws EOFException if the number of bytes read was incorrect |
| * @since 2.2 |
| */ |
| public static void readFully(final InputStream input, final byte[] buffer) throws IOException { |
| readFully(input, buffer, 0, buffer.length); |
| } |
| |
| /** |
| * Reads the requested number of bytes or fail if there are not enough left. |
| * <p> |
| * This allows for the possibility that {@link InputStream#read(byte[], int, int)} may |
| * not read as many bytes as requested (most likely because of reaching EOF). |
| * |
| * @param input where to read input from |
| * @param length length to read, must be >= 0 |
| * @return the bytes read from input |
| * @throws IOException if there is a problem reading the file |
| * @throws IllegalArgumentException if length is negative |
| * @throws EOFException if the number of bytes read was incorrect |
| * @since 2.5 |
| */ |
| public static byte[] readFully(final InputStream input, final int length) throws IOException { |
| final byte[] buffer = new byte[length]; |
| readFully(input, buffer, 0, buffer.length); |
| return buffer; |
| } |
| |
| /** |
| * Reads the requested number of bytes or fail if there are not enough left. |
| * <p> |
| * This allows for the possibility that {@link ReadableByteChannel#read(ByteBuffer)} may |
| * not read as many bytes as requested (most likely because of reaching EOF). |
| * |
| * @param input the byte channel to read |
| * @param buffer byte buffer destination |
| * @throws IOException if there is a problem reading the file |
| * @throws EOFException if the number of bytes read was incorrect |
| * @since 2.5 |
| */ |
| public static void readFully(final ReadableByteChannel input, final ByteBuffer buffer) throws IOException { |
| final int expected = buffer.remaining(); |
| final int actual = read(input, buffer); |
| if (actual != expected) { |
| throw new EOFException("Length to read: " + expected + " actual: " + actual); |
| } |
| } |
| |
| } |