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apache / commons-io / ef5b7a36875ec0c5691be77015b3a54515ef08a3 / . / src / main / java / org / apache / commons / io / FileUtils.java
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/*
* 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.BufferedOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.math.BigInteger;
import java.net.URL;
import java.net.URLConnection;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;
import java.util.zip.Checksum;
import org.apache.commons.io.file.Counters;
import org.apache.commons.io.file.PathUtils;
import org.apache.commons.io.filefilter.DirectoryFileFilter;
import org.apache.commons.io.filefilter.FalseFileFilter;
import org.apache.commons.io.filefilter.FileFilterUtils;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.filefilter.SuffixFileFilter;
import org.apache.commons.io.filefilter.TrueFileFilter;
import org.apache.commons.io.output.NullOutputStream;
/**
* General file manipulation utilities.
* <p>
* Facilities are provided in the following areas:
* </p>
* <ul>
* <li>writing to a file
* <li>reading from a file
* <li>make a directory including parent directories
* <li>copying files and directories
* <li>deleting files and directories
* <li>converting to and from a URL
* <li>listing files and directories by filter and extension
* <li>comparing file content
* <li>file last changed date
* <li>calculating a checksum
* </ul>
* <p>
* Note that a specific charset should be specified whenever possible.
* Relying on the platform default means that the code is Locale-dependent.
* Only use the default if the files are known to always use the platform default.
* </p>
* <p>
* Origin of code: Excalibur, Alexandria, Commons-Utils
* </p>
*/
public class FileUtils {
/**
* The number of bytes in a kilobyte.
*/
public static final long ONE_KB = 1024;
/**
* The number of bytes in a kilobyte.
*
* @since 2.4
*/
public static final BigInteger ONE_KB_BI = BigInteger.valueOf(ONE_KB);
/**
* The number of bytes in a megabyte.
*/
public static final long ONE_MB = ONE_KB * ONE_KB;
/**
* The number of bytes in a megabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_MB_BI = ONE_KB_BI.multiply(ONE_KB_BI);
/**
* The number of bytes in a gigabyte.
*/
public static final long ONE_GB = ONE_KB * ONE_MB;
/**
* The number of bytes in a gigabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_GB_BI = ONE_KB_BI.multiply(ONE_MB_BI);
/**
* The number of bytes in a terabyte.
*/
public static final long ONE_TB = ONE_KB * ONE_GB;
/**
* The number of bytes in a terabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_TB_BI = ONE_KB_BI.multiply(ONE_GB_BI);
/**
* The number of bytes in a petabyte.
*/
public static final long ONE_PB = ONE_KB * ONE_TB;
/**
* The number of bytes in a petabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_PB_BI = ONE_KB_BI.multiply(ONE_TB_BI);
/**
* The number of bytes in an exabyte.
*/
public static final long ONE_EB = ONE_KB * ONE_PB;
/**
* The number of bytes in an exabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_EB_BI = ONE_KB_BI.multiply(ONE_PB_BI);
/**
* The number of bytes in a zettabyte.
*/
public static final BigInteger ONE_ZB = BigInteger.valueOf(ONE_KB).multiply(BigInteger.valueOf(ONE_EB));
/**
* The number of bytes in a yottabyte.
*/
public static final BigInteger ONE_YB = ONE_KB_BI.multiply(ONE_ZB);
/**
* An empty array of type <code>File</code>.
*/
public static final File[] EMPTY_FILE_ARRAY = new File[0];
//-----------------------------------------------------------------------
/**
* Returns a human-readable version of the file size, where the input represents a specific number of bytes.
* <p>
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is rounded down to the
* nearest GB boundary.
* </p>
* <p>
* Similarly for the 1MB and 1KB boundaries.
* </p>
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
* @see <a href="https://issues.apache.org/jira/browse/IO-226">IO-226 - should the rounding be changed?</a>
* @since 2.4
*/
// See https://issues.apache.org/jira/browse/IO-226 - should the rounding be changed?
public static String byteCountToDisplaySize(final BigInteger size) {
String displaySize;
if (size.divide(ONE_EB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_EB_BI)) + " EB";
} else if (size.divide(ONE_PB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_PB_BI)) + " PB";
} else if (size.divide(ONE_TB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_TB_BI)) + " TB";
} else if (size.divide(ONE_GB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_GB_BI)) + " GB";
} else if (size.divide(ONE_MB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_MB_BI)) + " MB";
} else if (size.divide(ONE_KB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_KB_BI)) + " KB";
} else {
displaySize = String.valueOf(size) + " bytes";
}
return displaySize;
}
/**
* Returns a human-readable version of the file size, where the input represents a specific number of bytes.
* <p>
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is rounded down to the
* nearest GB boundary.
* </p>
* <p>
* Similarly for the 1MB and 1KB boundaries.
* </p>
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
* @see <a href="https://issues.apache.org/jira/browse/IO-226">IO-226 - should the rounding be changed?</a>
*/
// See https://issues.apache.org/jira/browse/IO-226 - should the rounding be changed?
public static String byteCountToDisplaySize(final long size) {
return byteCountToDisplaySize(BigInteger.valueOf(size));
}
/**
* Checks that the given {@code File} exists and is a directory.
*
* @param directory The {@code File} to check.
* @throws IllegalArgumentException if the given {@code File} does not exist or is not a directory.
*/
private static void checkDirectory(final File directory) {
if (!directory.exists()) {
throw new IllegalArgumentException(directory + " does not exist");
}
if (!directory.isDirectory()) {
throw new IllegalArgumentException(directory + " is not a directory");
}
}
/**
* Checks that two file lengths are equal.
*
* @param srcFile Source file.
* @param destFile Destination file.
* @param srcLen Source file length.
* @param dstLen Destination file length
* @throws IOException Thrown when the given sizes are not equal.
*/
private static void checkEqualSizes(final File srcFile, final File destFile, final long srcLen, final long dstLen)
throws IOException {
if (srcLen != dstLen) {
throw new IOException("Failed to copy full contents from '" + srcFile + "' to '" + destFile
+ "' Expected length: " + srcLen + " Actual: " + dstLen);
}
}
/**
* Checks requirements for file copy.
*
* @param src the source file
* @param dest the destination
* @throws FileNotFoundException if the destination does not exist
*/
private static void checkFileRequirements(final File src, final File dest) throws FileNotFoundException {
if (src == null) {
throw new NullPointerException("Source must not be null");
}
if (dest == null) {
throw new NullPointerException("Destination must not be null");
}
if (!src.exists()) {
throw new FileNotFoundException("Source '" + src + "' does not exist");
}
}
/**
* Computes the checksum of a file using the specified checksum object.
* Multiple files may be checked using one <code>Checksum</code> instance
* if desired simply by reusing the same checksum object.
* For example:
* <pre>
* long csum = FileUtils.checksum(file, new CRC32()).getValue();
* </pre>
*
* @param file the file to checksum, must not be {@code null}
* @param checksum the checksum object to be used, must not be {@code null}
* @return the checksum specified, updated with the content of the file
* @throws NullPointerException if the file or checksum is {@code null}
* @throws IllegalArgumentException if the file is a directory
* @throws IOException if an IO error occurs reading the file
* @since 1.3
*/
public static Checksum checksum(final File file, final Checksum checksum) throws IOException {
if (file.isDirectory()) {
throw new IllegalArgumentException("Checksums can't be computed on directories");
}
try (InputStream in = new CheckedInputStream(new FileInputStream(file), checksum)) {
IOUtils.copy(in, NullOutputStream.NULL_OUTPUT_STREAM);
}
return checksum;
}
//-----------------------------------------------------------------------
/**
* Computes the checksum of a file using the CRC32 checksum routine.
* The value of the checksum is returned.
*
* @param file the file to checksum, must not be {@code null}
* @return the checksum value
* @throws NullPointerException if the file or checksum is {@code null}
* @throws IllegalArgumentException if the file is a directory
* @throws IOException if an IO error occurs reading the file
* @since 1.3
*/
public static long checksumCRC32(final File file) throws IOException {
return checksum(file, new CRC32()).getValue();
}
/**
* Cleans a directory without deleting it.
*
* @param directory directory to clean
* @throws IOException in case cleaning is unsuccessful
* @throws IllegalArgumentException if {@code directory} does not exist or is not a directory
*/
public static void cleanDirectory(final File directory) throws IOException {
final File[] files = verifiedListFiles(directory);
IOException exception = null;
for (final File file : files) {
try {
forceDelete(file);
} catch (final IOException ioe) {
exception = ioe;
}
}
if (null != exception) {
throw exception;
}
}
/**
* Cleans a directory without deleting it.
*
* @param directory directory to clean, must not be {@code null}
* @throws NullPointerException if the directory is {@code null}
* @throws IOException in case cleaning is unsuccessful
*/
private static void cleanDirectoryOnExit(final File directory) throws IOException {
final File[] files = verifiedListFiles(directory);
IOException exception = null;
for (final File file : files) {
try {
forceDeleteOnExit(file);
} catch (final IOException ioe) {
exception = ioe;
}
}
if (null != exception) {
throw exception;
}
}
//-----------------------------------------------------------------------
/**
* Compares the contents of two files to determine if they are equal or not.
* <p>
* This method checks to see if the two files are different lengths
* or if they point to the same file, before resorting to byte-by-byte
* comparison of the contents.
* </p>
* <p>
* Code origin: Avalon
* </p>
*
* @param file1 the first file
* @param file2 the second file
* @return true if the content of the files are equal or they both don't
* exist, false otherwise
* @throws IOException in case of an I/O error
* @see org.apache.commons.io.file.PathUtils#fileContentEquals(Path,Path,OpenOption...)
*/
public static boolean contentEquals(final File file1, final File file2) throws IOException {
if (file1 == null && file2 == null) {
return true;
}
if (file1 == null ^ file2 == null) {
return false;
}
final boolean file1Exists = file1.exists();
if (file1Exists != file2.exists()) {
return false;
}
if (!file1Exists) {
// two not existing files are equal
return true;
}
if (file1.isDirectory() || file2.isDirectory()) {
// don't want to compare directory contents
throw new IOException("Can't compare directories, only files");
}
if (file1.length() != file2.length()) {
// lengths differ, cannot be equal
return false;
}
if (file1.getCanonicalFile().equals(file2.getCanonicalFile())) {
// same file
return true;
}
try (InputStream input1 = new FileInputStream(file1);
InputStream input2 = new FileInputStream(file2)) {
return IOUtils.contentEquals(input1, input2);
}
}
//-----------------------------------------------------------------------
/**
* Compares the contents of two files to determine if they are equal or not.
* <p>
* This method checks to see if the two files point to the same file,
* before resorting to line-by-line comparison of the contents.
* </p>
*
* @param file1 the first file
* @param file2 the second file
* @param charsetName the character encoding to be used.
* May be null, in which case the platform default is used
* @return true if the content of the files are equal or neither exists,
* false otherwise
* @throws IOException in case of an I/O error
* @see IOUtils#contentEqualsIgnoreEOL(Reader, Reader)
* @since 2.2
*/
public static boolean contentEqualsIgnoreEOL(final File file1, final File file2, final String charsetName)
throws IOException {
if (file1 == null && file2 == null) {
return true;
}
if (file1 == null ^ file2 == null) {
return false;
}
final boolean file1Exists = file1.exists();
if (file1Exists != file2.exists()) {
return false;
}
if (!file1Exists) {
// two not existing files are equal
return true;
}
if (file1.isDirectory() || file2.isDirectory()) {
// don't want to compare directory contents
throw new IOException("Can't compare directories, only files");
}
if (file1.getCanonicalFile().equals(file2.getCanonicalFile())) {
// same file
return true;
}
try (Reader input1 = new InputStreamReader(new FileInputStream(file1), Charsets.toCharset(charsetName));
Reader input2 = new InputStreamReader(new FileInputStream(file2), Charsets.toCharset(charsetName))) {
return IOUtils.contentEqualsIgnoreEOL(input1, input2);
}
}
//-----------------------------------------------------------------------
/**
* Converts a Collection containing java.io.File instanced into array
* representation. This is to account for the difference between
* File.listFiles() and FileUtils.listFiles().
*
* @param files a Collection containing java.io.File instances
* @return an array of java.io.File
*/
public static File[] convertFileCollectionToFileArray(final Collection<File> files) {
return files.toArray(new File[files.size()]);
}
/**
* Copies a whole directory to a new location preserving the file dates.
* <p>
* This method copies the specified directory and all its child
* directories and files to the specified destination.
* The destination is the new location and name of the directory.
* </p>
* <p>
* The destination directory is created if it does not exist.
* If the destination directory did exist, then this method merges
* the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the files' last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
* </p>
*
* @param srcDir an existing directory to copy, must not be {@code null}
* @param destDir the new directory, must not be {@code null}
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @since 1.1
*/
public static void copyDirectory(final File srcDir, final File destDir) throws IOException {
copyDirectory(srcDir, destDir, true);
}
/**
* Copies a whole directory to a new location.
* <p>
* This method copies the contents of the specified source directory
* to within the specified destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist.
* If the destination directory did exist, then this method merges
* the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> Setting <code>preserveFileDate</code> to
* {@code true} tries to preserve the files' last modified
* date/times using {@link File#setLastModified(long)}, however it is
* not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
* </p>
*
* @param srcDir an existing directory to copy, must not be {@code null}
* @param destDir the new directory, must not be {@code null}
* @param preserveFileDate true if the file date of the copy
* should be the same as the original
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @since 1.1
*/
public static void copyDirectory(final File srcDir, final File destDir,
final boolean preserveFileDate) throws IOException {
copyDirectory(srcDir, destDir, null, preserveFileDate);
}
/**
* Copies a filtered directory to a new location preserving the file dates.
* <p>
* This method copies the contents of the specified source directory
* to within the specified destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist.
* If the destination directory did exist, then this method merges
* the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the files' last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
* </p>
* <b>Example: Copy directories only</b>
* <pre>
* // only copy the directory structure
* FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY);
* </pre>
*
* <b>Example: Copy directories and txt files</b>
* <pre>
* // Create a filter for ".txt" files
* IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
* IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
*
* // Create a filter for either directories or ".txt" files
* FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
*
* // Copy using the filter
* FileUtils.copyDirectory(srcDir, destDir, filter);
* </pre>
*
* @param srcDir an existing directory to copy, must not be {@code null}
* @param destDir the new directory, must not be {@code null}
* @param filter the filter to apply, null means copy all directories and files
* should be the same as the original
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @since 1.4
*/
public static void copyDirectory(final File srcDir, final File destDir,
final FileFilter filter) throws IOException {
copyDirectory(srcDir, destDir, filter, true);
}
/**
* Copies a filtered directory to a new location.
* <p>
* This method copies the contents of the specified source directory
* to within the specified destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist.
* If the destination directory did exist, then this method merges
* the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> Setting <code>preserveFileDate</code> to
* {@code true} tries to preserve the files' last modified
* date/times using {@link File#setLastModified(long)}, however it is
* not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
* </p>
* <b>Example: Copy directories only</b>
* <pre>
* // only copy the directory structure
* FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY, false);
* </pre>
*
* <b>Example: Copy directories and txt files</b>
* <pre>
* // Create a filter for ".txt" files
* IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
* IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
*
* // Create a filter for either directories or ".txt" files
* FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
*
* // Copy using the filter
* FileUtils.copyDirectory(srcDir, destDir, filter, false);
* </pre>
*
* @param srcDir an existing directory to copy, must not be {@code null}
* @param destDir the new directory, must not be {@code null}
* @param filter the filter to apply, null means copy all directories and files
* @param preserveFileDate true if the file date of the copy
* should be the same as the original
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @since 1.4
*/
public static void copyDirectory(final File srcDir, final File destDir,
final FileFilter filter, final boolean preserveFileDate) throws IOException {
checkFileRequirements(srcDir, destDir);
if (!srcDir.isDirectory()) {
throw new IOException("Source '" + srcDir + "' exists but is not a directory");
}
if (srcDir.getCanonicalPath().equals(destDir.getCanonicalPath())) {
throw new IOException("Source '" + srcDir + "' and destination '" + destDir + "' are the same");
}
// Cater for destination being directory within the source directory (see IO-141)
List<String> exclusionList = null;
if (destDir.getCanonicalPath().startsWith(srcDir.getCanonicalPath())) {
final File[] srcFiles = filter == null ? srcDir.listFiles() : srcDir.listFiles(filter);
if (srcFiles != null && srcFiles.length > 0) {
exclusionList = new ArrayList<>(srcFiles.length);
for (final File srcFile : srcFiles) {
final File copiedFile = new File(destDir, srcFile.getName());
exclusionList.add(copiedFile.getCanonicalPath());
}
}
}
doCopyDirectory(srcDir, destDir, filter, preserveFileDate, exclusionList);
}
//-----------------------------------------------------------------------
/**
* Copies a directory to within another directory preserving the file dates.
* <p>
* This method copies the source directory and all its contents to a
* directory of the same name in the specified destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist.
* If the destination directory did exist, then this method merges
* the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the files' last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
* </p>
*
* @param srcDir an existing directory to copy, must not be {@code null}
* @param destDir the directory to place the copy in, must not be {@code null}
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IllegalArgumentException if {@code srcDir} or {@code destDir} is not a directory
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @since 1.2
*/
public static void copyDirectoryToDirectory(final File srcDir, final File destDir) throws IOException {
if (srcDir == null) {
throw new NullPointerException("Source must not be null");
}
if (srcDir.exists() && srcDir.isDirectory() == false) {
throw new IllegalArgumentException("Source '" + srcDir + "' is not a directory");
}
if (destDir == null) {
throw new NullPointerException("Destination must not be null");
}
if (destDir.exists() && destDir.isDirectory() == false) {
throw new IllegalArgumentException("Destination '" + destDir + "' is not a directory");
}
copyDirectory(srcDir, new File(destDir, srcDir.getName()), true);
}
/**
* Copies a file to a new location preserving the file date.
* <p>
* This method copies the contents of the specified source file to the
* specified destination file. The directory holding the destination file is
* created if it does not exist. If the destination file exists, then this
* method will overwrite it.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the file's last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
* </p>
*
* @param srcFile an existing file to copy, must not be {@code null}
* @param destFile the new file, must not be {@code null}
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @throws IOException if the output file length is not the same as the input file length after the copy
* completes
* @see #copyFileToDirectory(File, File)
* @see #copyFile(File, File, boolean)
*/
public static void copyFile(final File srcFile, final File destFile) throws IOException {
copyFile(srcFile, destFile, true);
}
/**
* Copies a file to a new location.
* <p>
* This method copies the contents of the specified source file
* to the specified destination file.
* The directory holding the destination file is created if it does not exist.
* If the destination file exists, then this method will overwrite it.
* </p>
* <p>
* <strong>Note:</strong> Setting <code>preserveFileDate</code> to
* {@code true} tries to preserve the file's last modified
* date/times using {@link File#setLastModified(long)}, however it is
* not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
* </p>
*
* @param srcFile an existing file to copy, must not be {@code null}
* @param destFile the new file, must not be {@code null}
* @param preserveFileDate true if the file date of the copy
* should be the same as the original
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @throws IOException if the output file length is not the same as the input file length after the copy
* completes
* @see #copyFileToDirectory(File, File, boolean)
* @see #doCopyFile(File, File, boolean)
*/
public static void copyFile(final File srcFile, final File destFile,
final boolean preserveFileDate) throws IOException {
checkFileRequirements(srcFile, destFile);
if (srcFile.isDirectory()) {
throw new IOException("Source '" + srcFile + "' exists but is a directory");
}
if (srcFile.getCanonicalPath().equals(destFile.getCanonicalPath())) {
throw new IOException("Source '" + srcFile + "' and destination '" + destFile + "' are the same");
}
final File parentFile = destFile.getParentFile();
if (parentFile != null) {
if (!parentFile.mkdirs() && !parentFile.isDirectory()) {
throw new IOException("Destination '" + parentFile + "' directory cannot be created");
}
}
if (destFile.exists() && destFile.canWrite() == false) {
throw new IOException("Destination '" + destFile + "' exists but is read-only");
}
doCopyFile(srcFile, destFile, preserveFileDate);
}
/**
* Copy bytes from a <code>File</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>
*
* @param input the <code>File</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 2.1
*/
public static long copyFile(final File input, final OutputStream output) throws IOException {
try (FileInputStream fis = new FileInputStream(input)) {
return IOUtils.copyLarge(fis, output);
}
}
//-----------------------------------------------------------------------
/**
* Copies a file to a directory preserving the file date.
* <p>
* This method copies the contents of the specified source file
* to a file of the same name in the specified destination directory.
* The destination directory is created if it does not exist.
* If the destination file exists, then this method will overwrite it.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the file's last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
* </p>
*
* @param srcFile an existing file to copy, must not be {@code null}
* @param destDir the directory to place the copy in, must not be {@code null}
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @see #copyFile(File, File, boolean)
*/
public static void copyFileToDirectory(final File srcFile, final File destDir) throws IOException {
copyFileToDirectory(srcFile, destDir, true);
}
/**
* Copies a file to a directory optionally preserving the file date.
* <p>
* This method copies the contents of the specified source file
* to a file of the same name in the specified destination directory.
* The destination directory is created if it does not exist.
* If the destination file exists, then this method will overwrite it.
* </p>
* <p>
* <strong>Note:</strong> Setting <code>preserveFileDate</code> to
* {@code true} tries to preserve the file's last modified
* date/times using {@link File#setLastModified(long)}, however it is
* not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
* </p>
*
* @param srcFile an existing file to copy, must not be {@code null}
* @param destDir the directory to place the copy in, must not be {@code null}
* @param preserveFileDate true if the file date of the copy
* should be the same as the original
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @throws IOException if the output file length is not the same as the input file length after the copy
* completes
* @see #copyFile(File, File, boolean)
* @since 1.3
*/
public static void copyFileToDirectory(final File srcFile, final File destDir, final boolean preserveFileDate)
throws IOException {
if (destDir == null) {
throw new NullPointerException("Destination must not be null");
}
if (destDir.exists() && destDir.isDirectory() == false) {
throw new IllegalArgumentException("Destination '" + destDir + "' is not a directory");
}
final File destFile = new File(destDir, srcFile.getName());
copyFile(srcFile, destFile, preserveFileDate);
}
/**
* Copies bytes from an {@link InputStream} <code>source</code> to a file
* <code>destination</code>. The directories up to <code>destination</code>
* will be created if they don't already exist. <code>destination</code>
* will be overwritten if it already exists.
* The {@code source} stream is closed.
* See {@link #copyToFile(InputStream, File)} for a method that does not close the input stream.
*
* @param source the <code>InputStream</code> to copy bytes from, must not be {@code null}, will be closed
* @param destination the non-directory <code>File</code> to write bytes to
* (possibly overwriting), must not be {@code null}
* @throws IOException if <code>destination</code> is a directory
* @throws IOException if <code>destination</code> cannot be written
* @throws IOException if <code>destination</code> needs creating but can't be
* @throws IOException if an IO error occurs during copying
* @since 2.0
*/
public static void copyInputStreamToFile(final InputStream source, final File destination) throws IOException {
try (InputStream in = source) {
copyToFile(in, destination);
}
}
/**
* Copies a file or directory to within another directory preserving the file dates.
* <p>
* This method copies the source file or directory, along all its contents, to a
* directory of the same name in the specified destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist.
* If the destination directory did exist, then this method merges
* the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the files' last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
* </p>
*
* @param src an existing file or directory to copy, must not be {@code null}
* @param destDir the directory to place the copy in, must not be {@code null}
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @see #copyDirectoryToDirectory(File, File)
* @see #copyFileToDirectory(File, File)
* @since 2.6
*/
public static void copyToDirectory(final File src, final File destDir) throws IOException {
if (src == null) {
throw new NullPointerException("Source must not be null");
}
if (src.isFile()) {
copyFileToDirectory(src, destDir);
} else if (src.isDirectory()) {
copyDirectoryToDirectory(src, destDir);
} else {
throw new IOException("The source " + src + " does not exist");
}
}
/**
* Copies a files to a directory preserving each file's date.
* <p>
* This method copies the contents of the specified source files
* to a file of the same name in the specified destination directory.
* The destination directory is created if it does not exist.
* If the destination file exists, then this method will overwrite it.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the file's last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
* </p>
*
* @param srcs a existing files to copy, must not be {@code null}
* @param destDir the directory to place the copy in, must not be {@code null}
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @see #copyFileToDirectory(File, File)
* @since 2.6
*/
public static void copyToDirectory(final Iterable<File> srcs, final File destDir) throws IOException {
if (srcs == null) {
throw new NullPointerException("Sources must not be null");
}
for (final File src : srcs) {
copyFileToDirectory(src, destDir);
}
}
/**
* Copies bytes from an {@link InputStream} <code>source</code> to a file
* <code>destination</code>. The directories up to <code>destination</code>
* will be created if they don't already exist. <code>destination</code>
* will be overwritten if it already exists.
* The {@code source} stream is left open, e.g. for use with {@link java.util.zip.ZipInputStream ZipInputStream}.
* See {@link #copyInputStreamToFile(InputStream, File)} for a method that closes the input stream.
*
* @param source the <code>InputStream</code> to copy bytes from, must not be {@code null}
* @param destination the non-directory <code>File</code> to write bytes to
* (possibly overwriting), must not be {@code null}
* @throws IOException if <code>destination</code> is a directory
* @throws IOException if <code>destination</code> cannot be written
* @throws IOException if <code>destination</code> needs creating but can't be
* @throws IOException if an IO error occurs during copying
* @since 2.5
*/
public static void copyToFile(final InputStream source, final File destination) throws IOException {
try (OutputStream out = openOutputStream(destination)) {
IOUtils.copy(source, out);
}
}
//-----------------------------------------------------------------------
/**
* Copies bytes from the URL <code>source</code> to a file
* <code>destination</code>. The directories up to <code>destination</code>
* will be created if they don't already exist. <code>destination</code>
* will be overwritten if it already exists.
* <p>
* Warning: this method does not set a connection or read timeout and thus
* might block forever. Use {@link #copyURLToFile(URL, File, int, int)}
* with reasonable timeouts to prevent this.
* </p>
*
* @param source the <code>URL</code> to copy bytes from, must not be {@code null}
* @param destination the non-directory <code>File</code> to write bytes to
* (possibly overwriting), must not be {@code null}
* @throws IOException if <code>source</code> URL cannot be opened
* @throws IOException if <code>destination</code> is a directory
* @throws IOException if <code>destination</code> cannot be written
* @throws IOException if <code>destination</code> needs creating but can't be
* @throws IOException if an IO error occurs during copying
*/
public static void copyURLToFile(final URL source, final File destination) throws IOException {
copyInputStreamToFile(source.openStream(), destination);
}
/**
* Copies bytes from the URL <code>source</code> to a file
* <code>destination</code>. The directories up to <code>destination</code>
* will be created if they don't already exist. <code>destination</code>
* will be overwritten if it already exists.
*
* @param source the <code>URL</code> to copy bytes from, must not be {@code null}
* @param destination the non-directory <code>File</code> to write bytes to
* (possibly overwriting), must not be {@code null}
* @param connectionTimeout the number of milliseconds until this method
* will timeout if no connection could be established to the <code>source</code>
* @param readTimeout the number of milliseconds until this method will
* timeout if no data could be read from the <code>source</code>
* @throws IOException if <code>source</code> URL cannot be opened
* @throws IOException if <code>destination</code> is a directory
* @throws IOException if <code>destination</code> cannot be written
* @throws IOException if <code>destination</code> needs creating but can't be
* @throws IOException if an IO error occurs during copying
* @since 2.0
*/
public static void copyURLToFile(final URL source, final File destination,
final int connectionTimeout, final int readTimeout) throws IOException {
final URLConnection connection = source.openConnection();
connection.setConnectTimeout(connectionTimeout);
connection.setReadTimeout(readTimeout);
copyInputStreamToFile(connection.getInputStream(), destination);
}
/**
* Decodes the specified URL as per RFC 3986, i.e. transforms
* percent-encoded octets to characters by decoding with the UTF-8 character
* set. This function is primarily intended for usage with
* {@link java.net.URL} which unfortunately does not enforce proper URLs. As
* such, this method will leniently accept invalid characters or malformed
* percent-encoded octets and simply pass them literally through to the
* result string. Except for rare edge cases, this will make unencoded URLs
* pass through unaltered.
*
* @param url The URL to decode, may be {@code null}.
* @return The decoded URL or {@code null} if the input was
* {@code null}.
*/
static String decodeUrl(final String url) {
String decoded = url;
if (url != null && url.indexOf('%') >= 0) {
final int n = url.length();
final StringBuilder buffer = new StringBuilder();
final ByteBuffer bytes = ByteBuffer.allocate(n);
for (int i = 0; i < n; ) {
if (url.charAt(i) == '%') {
try {
do {
final byte octet = (byte) Integer.parseInt(url.substring(i + 1, i + 3), 16);
bytes.put(octet);
i += 3;
} while (i < n && url.charAt(i) == '%');
continue;
} catch (final RuntimeException e) {
// malformed percent-encoded octet, fall through and
// append characters literally
} finally {
if (bytes.position() > 0) {
bytes.flip();
buffer.append(StandardCharsets.UTF_8.decode(bytes).toString());
bytes.clear();
}
}
}
buffer.append(url.charAt(i++));
}
decoded = buffer.toString();
}
return decoded;
}
//-----------------------------------------------------------------------
/**
* Deletes a directory recursively.
*
* @param directory directory to delete
* @throws IOException in case deletion is unsuccessful
* @throws IllegalArgumentException if {@code directory} does not exist or is not a directory
*/
public static void deleteDirectory(final File directory) throws IOException {
if (!directory.exists()) {
return;
}
if (!isSymlink(directory)) {
cleanDirectory(directory);
}
if (!directory.delete()) {
final String message =
"Unable to delete directory " + directory + ".";
throw new IOException(message);
}
}
/**
* Schedules a directory recursively for deletion on JVM exit.
*
* @param directory directory to delete, must not be {@code null}
* @throws NullPointerException if the directory is {@code null}
* @throws IOException in case deletion is unsuccessful
*/
private static void deleteDirectoryOnExit(final File directory) throws IOException {
if (!directory.exists()) {
return;
}
directory.deleteOnExit();
if (!isSymlink(directory)) {
cleanDirectoryOnExit(directory);
}
}
/**
* Deletes a file, never throwing an exception. If file is a directory, delete it and all sub-directories.
* <p>
* The difference between File.delete() and this method are:
* </p>
* <ul>
* <li>A directory to be deleted does not have to be empty.</li>
* <li>No exceptions are thrown when a file or directory cannot be deleted.</li>
* </ul>
*
* @param file file or directory to delete, can be {@code null}
* @return {@code true} if the file or directory was deleted, otherwise
* {@code false}
*
* @since 1.4
*/
public static boolean deleteQuietly(final File file) {
if (file == null) {
return false;
}
try {
if (file.isDirectory()) {
cleanDirectory(file);
}
} catch (final Exception ignored) {
// ignore
}
try {
return file.delete();
} catch (final Exception ignored) {
return false;
}
}
/**
* Determines whether the {@code parent} directory contains the {@code child} element (a file or directory).
* <p>
* Files are normalized before comparison.
* </p>
*
* Edge cases:
* <ul>
* <li>A {@code directory} must not be null: if null, throw IllegalArgumentException</li>
* <li>A {@code directory} must be a directory: if not a directory, throw IllegalArgumentException</li>
* <li>A directory does not contain itself: return false</li>
* <li>A null child file is not contained in any parent: return false</li>
* </ul>
*
* @param directory the file to consider as the parent.
* @param child the file to consider as the child.
* @return true is the candidate leaf is under by the specified composite. False otherwise.
* @throws IOException if an IO error occurs while checking the files.
* @throws IllegalArgumentException if {@code directory} is null or not a directory.
* @see FilenameUtils#directoryContains(String, String)
* @since 2.2
*/
public static boolean directoryContains(final File directory, final File child) throws IOException {
// Fail fast against NullPointerException
if (directory == null) {
throw new IllegalArgumentException("Directory must not be null");
}
if (!directory.isDirectory()) {
throw new IllegalArgumentException("Not a directory: " + directory);
}
if (child == null) {
return false;
}
if (!directory.exists() || !child.exists()) {
return false;
}
// Canonicalize paths (normalizes relative paths)
final String canonicalParent = directory.getCanonicalPath();
final String canonicalChild = child.getCanonicalPath();
return FilenameUtils.directoryContains(canonicalParent, canonicalChild);
}
/**
* Internal copy directory method.
*
* @param srcDir the validated source directory, must not be {@code null}
* @param destDir the validated destination directory, must not be {@code null}
* @param filter the filter to apply, null means copy all directories and files
* @param preserveFileDate whether to preserve the file date
* @param exclusionList List of files and directories to exclude from the copy, may be null
* @throws IOException if an error occurs
* @since 1.1
*/
private static void doCopyDirectory(final File srcDir, final File destDir, final FileFilter filter,
final boolean preserveFileDate, final List<String> exclusionList)
throws IOException {
// recurse
final File[] srcFiles = filter == null ? srcDir.listFiles() : srcDir.listFiles(filter);
if (srcFiles == null) { // null if abstract pathname does not denote a directory, or if an I/O error occurs
throw new IOException("Failed to list contents of " + srcDir);
}
if (destDir.exists()) {
if (destDir.isDirectory() == false) {
throw new IOException("Destination '" + destDir + "' exists but is not a directory");
}
} else {
if (!destDir.mkdirs() && !destDir.isDirectory()) {
throw new IOException("Destination '" + destDir + "' directory cannot be created");
}
}
if (destDir.canWrite() == false) {
throw new IOException("Destination '" + destDir + "' cannot be written to");
}
for (final File srcFile : srcFiles) {
final File dstFile = new File(destDir, srcFile.getName());
if (exclusionList == null || !exclusionList.contains(srcFile.getCanonicalPath())) {
if (srcFile.isDirectory()) {
doCopyDirectory(srcFile, dstFile, filter, preserveFileDate, exclusionList);
} else {
doCopyFile(srcFile, dstFile, preserveFileDate);
}
}
}
// Do this last, as the above has probably affected directory metadata
if (preserveFileDate) {
destDir.setLastModified(srcDir.lastModified());
}
}
/**
* Internal copy file method.
* This uses the original file length, and throws an IOException
* if the output file length is different from the current input file length.
* So it may fail if the file changes size.
* It may also fail with "IllegalArgumentException: Negative size" if the input file is truncated part way
* through copying the data and the new file size is less than the current position.
*
* @param srcFile the validated source file, must not be {@code null}
* @param destFile the validated destination file, must not be {@code null}
* @param preserveFileDate whether to preserve the file date
* @throws IOException if an error occurs
* @throws IOException if the output file length is not the same as the input file length after the
* copy completes
* @throws IllegalArgumentException "Negative size" if the file is truncated so that the size is less than the
* position
*/
private static void doCopyFile(final File srcFile, final File destFile, final boolean preserveFileDate)
throws IOException {
if (destFile.exists() && destFile.isDirectory()) {
throw new IOException("Destination '" + destFile + "' exists but is a directory");
}
final Path srcPath = srcFile.toPath();
final Path destPath = destFile.toPath();
final long newLastModifed = preserveFileDate ? srcFile.lastModified() : destFile.lastModified();
Files.copy(srcPath, destPath, StandardCopyOption.REPLACE_EXISTING);
// TODO IO-386: Do we still need this check?
checkEqualSizes(srcFile, destFile, Files.size(srcPath), Files.size(destPath));
// TODO IO-386: Do we still need this check?
checkEqualSizes(srcFile, destFile, srcFile.length(), destFile.length());
destFile.setLastModified(newLastModifed);
}
//-----------------------------------------------------------------------
/**
* Deletes a file. If file is a directory, delete it and all sub-directories.
* <p>
* The difference between File.delete() and this method are:
* </p>
* <ul>
* <li>The directory does not have to be empty.</li>
* <li>You get exceptions when a file or directory cannot be delete;
* {@link java.io.File#delete()} returns a boolean.</li>
* </ul>
*
* @param file file or directory to delete, must not be {@code null}
* @throws NullPointerException if the directory is {@code null}
* @throws FileNotFoundException if the file was not found
* @throws IOException in case deletion is unsuccessful
*/
public static void forceDelete(final File file) throws IOException {
final Counters.PathCounters deleteCounters;
try {
deleteCounters = PathUtils.delete(file.toPath());
} catch (IOException e) {
throw new IOException("Unable to delete file: " + file, e);
}
if (deleteCounters.getFileCounter().get() < 1 && deleteCounters.getDirectoryCounter().get() < 1) {
// didn't find a file to delete.
throw new FileNotFoundException("File does not exist: " + file);
}
}
/**
* Schedules a file to be deleted when JVM exits.
* If file is directory delete it and all sub-directories.
*
* @param file file or directory to delete, must not be {@code null}
* @throws NullPointerException if the file is {@code null}
* @throws IOException in case deletion is unsuccessful
*/
public static void forceDeleteOnExit(final File file) throws IOException {
if (file.isDirectory()) {
deleteDirectoryOnExit(file);
} else {
file.deleteOnExit();
}
}
/**
* Makes a directory, including any necessary but nonexistent parent
* directories. If a file already exists with specified name but it is
* not a directory then an IOException is thrown.
* If the directory cannot be created (or the file already exists but is not a directory)
* then an IOException is thrown.
*
* @param directory directory to create, must not be {@code null}
* @throws NullPointerException if the directory is {@code null}
* @throws IOException if the directory cannot be created or the file already exists but is not a directory
*/
public static void forceMkdir(final File directory) throws IOException {
if (directory.exists()) {
if (!directory.isDirectory()) {
final String message =
"File "
+ directory
+ " exists and is "
+ "not a directory. Unable to create directory.";
throw new IOException(message);
}
} else {
if (!directory.mkdirs()) {
// Double-check that some other thread or process hasn't made
// the directory in the background
if (!directory.isDirectory()) {
final String message =
"Unable to create directory " + directory;
throw new IOException(message);
}
}
}
}
/**
* Makes any necessary but nonexistent parent directories for a given File. If the parent directory cannot be
* created then an IOException is thrown.
*
* @param file file with parent to create, must not be {@code null}
* @throws NullPointerException if the file is {@code null}
* @throws IOException if the parent directory cannot be created
* @since 2.5
*/
public static void forceMkdirParent(final File file) throws IOException {
final File parent = file.getParentFile();
if (parent == null) {
return;
}
forceMkdir(parent);
}
//-----------------------------------------------------------------------
/**
* Construct a file from the set of name elements.
*
* @param directory the parent directory
* @param names the name elements
* @return the file
* @since 2.1
*/
public static File getFile(final File directory, final String... names) {
if (directory == null) {
throw new NullPointerException("directory must not be null");
}
if (names == null) {
throw new NullPointerException("names must not be null");
}
File file = directory;
for (final String name : names) {
file = new File(file, name);
}
return file;
}
/**
* Construct a file from the set of name elements.
*
* @param names the name elements
* @return the file
* @since 2.1
*/
public static File getFile(final String... names) {
if (names == null) {
throw new NullPointerException("names must not be null");
}
File file = null;
for (final String name : names) {
if (file == null) {
file = new File(name);
} else {
file = new File(file, name);
}
}
return file;
}
/**
* Returns a {@link File} representing the system temporary directory.
*
* @return the system temporary directory.
*
* @since 2.0
*/
public static File getTempDirectory() {
return new File(getTempDirectoryPath());
}
/**
* Returns the path to the system temporary directory.
*
* @return the path to the system temporary directory.
*
* @since 2.0
*/
public static String getTempDirectoryPath() {
return System.getProperty("java.io.tmpdir");
}
/**
* Returns a {@link File} representing the user's home directory.
*
* @return the user's home directory.
*
* @since 2.0
*/
public static File getUserDirectory() {
return new File(getUserDirectoryPath());
}
/**
* Returns the path to the user's home directory.
*
* @return the path to the user's home directory.
*
* @since 2.0
*/
public static String getUserDirectoryPath() {
return System.getProperty("user.home");
}
//-----------------------------------------------------------------------
/**
* Finds files within a given directory (and optionally its
* subdirectories). All files found are filtered by an IOFileFilter.
*
* @param files the collection of files found.
* @param directory the directory to search in.
* @param filter the filter to apply to files and directories.
* @param includeSubDirectories indicates if will include the subdirectories themselves
*/
private static void innerListFiles(final Collection<File> files, final File directory,
final IOFileFilter filter, final boolean includeSubDirectories) {
final File[] found = directory.listFiles((FileFilter) filter);
if (found != null) {
for (final File file : found) {
if (file.isDirectory()) {
if (includeSubDirectories) {
files.add(file);
}
innerListFiles(files, file, filter, includeSubDirectories);
} else {
files.add(file);
}
}
}
}
/**
* Finds files within a given directory (and optionally its
* subdirectories). All files found are filtered by an IOFileFilter.
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is {@code null}, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @param includeSubDirectories indicates if will include the subdirectories themselves
* @return a collection of java.io.File with the matching files
* @see org.apache.commons.io.FileUtils#listFiles
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
*/
private static Collection<File> innerListFilesOrDirectories(
final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter,
final boolean includeSubDirectories) {
validateListFilesParameters(directory, fileFilter);
final IOFileFilter effFileFilter = setUpEffectiveFileFilter(fileFilter);
final IOFileFilter effDirFilter = setUpEffectiveDirFilter(dirFilter);
//Find files
final Collection<File> files = new java.util.LinkedList<>();
if (includeSubDirectories) {
files.add(directory);
}
innerListFiles(files, directory,
FileFilterUtils.or(effFileFilter, effDirFilter), includeSubDirectories);
return files;
}
/**
* Tests if the specified <code>File</code> is newer than the specified
* <code>Date</code>.
*
* @param file the <code>File</code> of which the modification date
* must be compared, must not be {@code null}
* @param date the date reference, must not be {@code null}
* @return true if the <code>File</code> exists and has been modified
* after the given <code>Date</code>.
* @throws IllegalArgumentException if the file is {@code null}
* @throws IllegalArgumentException if the date is {@code null}
*/
public static boolean isFileNewer(final File file, final Date date) {
if (date == null) {
throw new IllegalArgumentException("No specified date");
}
return isFileNewer(file, date.getTime());
}
//-----------------------------------------------------------------------
/**
* Tests if the specified <code>File</code> is newer than the reference
* <code>File</code>.
*
* @param file the <code>File</code> of which the modification date must
* be compared, must not be {@code null}
* @param reference the <code>File</code> of which the modification date
* is used, must not be {@code null}
* @return true if the <code>File</code> exists and has been modified more
* recently than the reference <code>File</code>
* @throws IllegalArgumentException if the file is {@code null}
* @throws IllegalArgumentException if the reference file is {@code null} or doesn't exist
*/
public static boolean isFileNewer(final File file, final File reference) {
if (reference == null) {
throw new IllegalArgumentException("No specified reference file");
}
if (!reference.exists()) {
throw new IllegalArgumentException("The reference file '"
+ reference + "' doesn't exist");
}
return isFileNewer(file, reference.lastModified());
}
/**
* Tests if the specified <code>File</code> is newer than the specified
* time reference.
*
* @param file the <code>File</code> of which the modification date must
* be compared, must not be {@code null}
* @param timeMillis the time reference measured in milliseconds since the
* epoch (00:00:00 GMT, January 1, 1970)
* @return true if the <code>File</code> exists and has been modified after
* the given time reference.
* @throws IllegalArgumentException if the file is {@code null}
*/
public static boolean isFileNewer(final File file, final long timeMillis) {
if (file == null) {
throw new IllegalArgumentException("No specified file");
}
if (!file.exists()) {
return false;
}
return file.lastModified() > timeMillis;
}
/**
* Tests if the specified <code>File</code> is older than the specified
* <code>Date</code>.
*
* @param file the <code>File</code> of which the modification date
* must be compared, must not be {@code null}
* @param date the date reference, must not be {@code null}
* @return true if the <code>File</code> exists and has been modified
* before the given <code>Date</code>.
* @throws IllegalArgumentException if the file is {@code null}
* @throws IllegalArgumentException if the date is {@code null}
*/
public static boolean isFileOlder(final File file, final Date date) {
if (date == null) {
throw new IllegalArgumentException("No specified date");
}
return isFileOlder(file, date.getTime());
}
//-----------------------------------------------------------------------
/**
* Tests if the specified <code>File</code> is older than the reference
* <code>File</code>.
*
* @param file the <code>File</code> of which the modification date must
* be compared, must not be {@code null}
* @param reference the <code>File</code> of which the modification date
* is used, must not be {@code null}
* @return true if the <code>File</code> exists and has been modified before
* the reference <code>File</code>
* @throws IllegalArgumentException if the file is {@code null}
* @throws IllegalArgumentException if the reference file is {@code null} or doesn't exist
*/
public static boolean isFileOlder(final File file, final File reference) {
if (reference == null) {
throw new IllegalArgumentException("No specified reference file");
}
if (!reference.exists()) {
throw new IllegalArgumentException("The reference file '"
+ reference + "' doesn't exist");
}
return isFileOlder(file, reference.lastModified());
}
/**
* Tests if the specified <code>File</code> is older than the specified
* time reference.
*
* @param file the <code>File</code> of which the modification date must
* be compared, must not be {@code null}
* @param timeMillis the time reference measured in milliseconds since the
* epoch (00:00:00 GMT, January 1, 1970)
* @return true if the <code>File</code> exists and has been modified before
* the given time reference.
* @throws IllegalArgumentException if the file is {@code null}
*/
public static boolean isFileOlder(final File file, final long timeMillis) {
if (file == null) {
throw new IllegalArgumentException("No specified file");
}
if (!file.exists()) {
return false;
}
return file.lastModified() < timeMillis;
}
/**
* Determines whether the specified file is a Symbolic Link rather than an actual file.
* <p>
* Will not return true if there is a Symbolic Link anywhere in the path,
* only if the specific file is.
* </p>
* <p>
* When using jdk1.7, this method delegates to {@code boolean java.nio.file.Files.isSymbolicLink(Path path)}
* </p>
*
* <p>
* <b>Note:</b> the current implementation always returns {@code false} if running on
* jkd1.6 and the system is detected as Windows using {@link FilenameUtils#isSystemWindows()}
* </p>
* <p>
* For code that runs on Java 1.7 or later, use the following method instead:
* </p>
*
* {@code boolean java.nio.file.Files.isSymbolicLink(Path path)}
* @param file the file to check
* @return true if the file is a Symbolic Link
* @since 2.0
*/
public static boolean isSymlink(final File file) {
if (file == null) {
throw new NullPointerException("File must not be null");
}
return Files.isSymbolicLink(file.toPath());
}
/**
* Allows iteration over the files in given directory (and optionally
* its subdirectories).
* <p>
* All files found are filtered by an IOFileFilter. This method is
* based on {@link #listFiles(File, IOFileFilter, IOFileFilter)},
* which supports Iterable ('foreach' loop).
* </p>
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is {@code null}, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return an iterator of java.io.File for the matching files
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
* @since 1.2
*/
public static Iterator<File> iterateFiles(
final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter) {
return listFiles(directory, fileFilter, dirFilter).iterator();
}
/**
* Allows iteration over the files in a given directory (and optionally
* its subdirectories) which match an array of extensions. This method
* is based on {@link #listFiles(File, String[], boolean)},
* which supports Iterable ('foreach' loop).
*
* @param directory the directory to search in
* @param extensions an array of extensions, ex. {"java","xml"}. If this
* parameter is {@code null}, all files are returned.
* @param recursive if true all subdirectories are searched as well
* @return an iterator of java.io.File with the matching files
* @since 1.2
*/
public static Iterator<File> iterateFiles(
final File directory, final String[] extensions, final boolean recursive) {
return listFiles(directory, extensions, recursive).iterator();
}
/**
* Allows iteration over the files in given directory (and optionally
* its subdirectories).
* <p>
* All files found are filtered by an IOFileFilter. This method is
* based on {@link #listFilesAndDirs(File, IOFileFilter, IOFileFilter)},
* which supports Iterable ('foreach' loop).
* </p>
* <p>
* The resulting iterator includes the subdirectories themselves.
* </p>
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is {@code null}, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return an iterator of java.io.File for the matching files
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
* @since 2.2
*/
public static Iterator<File> iterateFilesAndDirs(final File directory, final IOFileFilter fileFilter,
final IOFileFilter dirFilter) {
return listFilesAndDirs(directory, fileFilter, dirFilter).iterator();
}
/**
* Returns an Iterator for the lines in a <code>File</code> using the default encoding for the VM.
*
* @param file the file to open for input, must not be {@code null}
* @return an Iterator of the lines in the file, never {@code null}
* @throws IOException in case of an I/O error (file closed)
* @see #lineIterator(File, String)
* @since 1.3
*/
public static LineIterator lineIterator(final File file) throws IOException {
return lineIterator(file, null);
}
/**
* Returns an Iterator for the lines in a <code>File</code>.
* <p>
* This method opens an <code>InputStream</code> for the file.
* When you have finished with the iterator you should close the stream
* to free internal resources. This can be done by calling the
* {@link LineIterator#close()} or
* {@link LineIterator#closeQuietly(LineIterator)} method.
* </p>
* <p>
* The recommended usage pattern is:
* </p>
* <pre>
* LineIterator it = FileUtils.lineIterator(file, "UTF-8");
* try {
* while (it.hasNext()) {
* String line = it.nextLine();
* /// do something with line
* }
* } finally {
* LineIterator.closeQuietly(iterator);
* }
* </pre>
* <p>
* If an exception occurs during the creation of the iterator, the
* underlying stream is closed.
* </p>
*
* @param file the file to open for input, must not be {@code null}
* @param encoding the encoding to use, {@code null} means platform default
* @return an Iterator of the lines in the file, never {@code null}
* @throws IOException in case of an I/O error (file closed)
* @since 1.2
*/
public static LineIterator lineIterator(final File file, final String encoding) throws IOException {
InputStream inputStream = null;
try {
inputStream = openInputStream(file);
return IOUtils.lineIterator(inputStream, encoding);
} catch (final IOException | RuntimeException ex) {
IOUtils.closeQuietly(inputStream, e -> ex.addSuppressed(e));
throw ex;
}
}
/**
* Finds files within a given directory (and optionally its
* subdirectories). All files found are filtered by an IOFileFilter.
* <p>
* If your search should recurse into subdirectories you can pass in
* an IOFileFilter for directories. You don't need to bind a
* DirectoryFileFilter (via logical AND) to this filter. This method does
* that for you.
* </p>
* <p>
* An example: If you want to search through all directories called
* "temp" you pass in <code>FileFilterUtils.NameFileFilter("temp")</code>
* </p>
* <p>
* Another common usage of this method is find files in a directory
* tree but ignoring the directories generated CVS. You can simply pass
* in <code>FileFilterUtils.makeCVSAware(null)</code>.
* </p>
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files. Must not be {@code null},
* use {@link TrueFileFilter#INSTANCE} to match all files in selected directories.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is {@code null}, subdirectories will not be included in the
* search. Use {@link TrueFileFilter#INSTANCE} to match all directories.
* @return a collection of java.io.File with the matching files
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
*/
public static Collection<File> listFiles(
final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter) {
return innerListFilesOrDirectories(directory, fileFilter, dirFilter, false);
}
/**
* Finds files within a given directory (and optionally its subdirectories)
* which match an array of extensions.
*
* @param directory the directory to search in
* @param extensions an array of extensions, ex. {"java","xml"}. If this
* parameter is {@code null}, all files are returned.
* @param recursive if true all subdirectories are searched as well
* @return a collection of java.io.File with the matching files
*/
public static Collection<File> listFiles(
final File directory, final String[] extensions, final boolean recursive) {
IOFileFilter filter;
if (extensions == null) {
filter = TrueFileFilter.INSTANCE;
} else {
final String[] suffixes = toSuffixes(extensions);
filter = new SuffixFileFilter(suffixes);
}
return listFiles(directory, filter,
recursive ? TrueFileFilter.INSTANCE : FalseFileFilter.INSTANCE);
}
/**
* Finds files within a given directory (and optionally its
* subdirectories). All files found are filtered by an IOFileFilter.
* <p>
* The resulting collection includes the starting directory and
* any subdirectories that match the directory filter.
* </p>
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is {@code null}, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return a collection of java.io.File with the matching files
* @see org.apache.commons.io.FileUtils#listFiles
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
* @since 2.2
*/
public static Collection<File> listFilesAndDirs(
final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter) {
return innerListFilesOrDirectories(directory, fileFilter, dirFilter, true);
}
/**
* Moves a directory.
* <p>
* When the destination directory is on another file system, do a "copy and delete".
* </p>
*
* @param srcDir the directory to be moved
* @param destDir the destination directory
* @throws NullPointerException if source or destination is {@code null}
* @throws FileExistsException if the destination directory exists
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs moving the file
* @since 1.4
*/
public static void moveDirectory(final File srcDir, final File destDir) throws IOException {
validateMoveParameters(srcDir, destDir);
if (!srcDir.isDirectory()) {
throw new IOException("Source '" + srcDir + "' is not a directory");
}
if (destDir.exists()) {
throw new FileExistsException("Destination '" + destDir + "' already exists");
}
final boolean rename = srcDir.renameTo(destDir);
if (!rename) {
if (destDir.getCanonicalPath().startsWith(srcDir.getCanonicalPath() + File.separator)) {
throw new IOException("Cannot move directory: " + srcDir + " to a subdirectory of itself: " + destDir);
}
copyDirectory(srcDir, destDir);
deleteDirectory(srcDir);
if (srcDir.exists()) {
throw new IOException("Failed to delete original directory '" + srcDir +
"' after copy to '" + destDir + "'");
}
}
}
/**
* Moves a directory to another directory.
*
* @param src the file to be moved
* @param destDir the destination file
* @param createDestDir If {@code true} create the destination directory,
* otherwise if {@code false} throw an IOException
* @throws NullPointerException if source or destination is {@code null}
* @throws FileExistsException if the directory exists in the destination directory
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs moving the file
* @since 1.4
*/
public static void moveDirectoryToDirectory(final File src, final File destDir, final boolean createDestDir)
throws IOException {
validateMoveParameters(src, destDir);
if (!destDir.exists() && createDestDir) {
destDir.mkdirs();
}
if (!destDir.exists()) {
throw new FileNotFoundException("Destination directory '" + destDir +
"' does not exist [createDestDir=" + createDestDir + "]");
}
if (!destDir.isDirectory()) {
throw new IOException("Destination '" + destDir + "' is not a directory");
}
moveDirectory(src, new File(destDir, src.getName()));
}
/**
* Moves a file.
* <p>
* When the destination file is on another file system, do a "copy and delete".
* </p>
*
* @param srcFile the file to be moved
* @param destFile the destination file
* @throws NullPointerException if source or destination is {@code null}
* @throws FileExistsException if the destination file exists
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs moving the file
* @since 1.4
*/
public static void moveFile(final File srcFile, final File destFile) throws IOException {
validateMoveParameters(srcFile, destFile);
if (srcFile.isDirectory()) {
throw new IOException("Source '" + srcFile + "' is a directory");
}
if (destFile.exists()) {
throw new FileExistsException("Destination '" + destFile + "' already exists");
}
if (destFile.isDirectory()) {
throw new IOException("Destination '" + destFile + "' is a directory");
}
final boolean rename = srcFile.renameTo(destFile);
if (!rename) {
copyFile(srcFile, destFile);
if (!srcFile.delete()) {
FileUtils.deleteQuietly(destFile);
throw new IOException("Failed to delete original file '" + srcFile +
"' after copy to '" + destFile + "'");
}
}
}
/**
* Moves a file to a directory.
*
* @param srcFile the file to be moved
* @param destDir the destination file
* @param createDestDir If {@code true} create the destination directory,
* otherwise if {@code false} throw an IOException
* @throws NullPointerException if source or destination is {@code null}
* @throws FileExistsException if the destination file exists
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs moving the file
* @since 1.4
*/
public static void moveFileToDirectory(final File srcFile, final File destDir, final boolean createDestDir)
throws IOException {
validateMoveParameters(srcFile, destDir);
if (!destDir.exists() && createDestDir) {
destDir.mkdirs();
}
if (!destDir.exists()) {
throw new FileNotFoundException("Destination directory '" + destDir +
"' does not exist [createDestDir=" + createDestDir + "]");
}
if (!destDir.isDirectory()) {
throw new IOException("Destination '" + destDir + "' is not a directory");
}
moveFile(srcFile, new File(destDir, srcFile.getName()));
}
/**
* Moves a file or directory to the destination directory.
* <p>
* When the destination is on another file system, do a "copy and delete".
* </p>
*
* @param src the file or directory to be moved
* @param destDir the destination directory
* @param createDestDir If {@code true} create the destination directory,
* otherwise if {@code false} throw an IOException
* @throws NullPointerException if source or destination is {@code null}
* @throws FileExistsException if the directory or file exists in the destination directory
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs moving the file
* @since 1.4
*/
public static void moveToDirectory(final File src, final File destDir, final boolean createDestDir)
throws IOException {
validateMoveParameters(src, destDir);
if (src.isDirectory()) {
moveDirectoryToDirectory(src, destDir, createDestDir);
} else {
moveFileToDirectory(src, destDir, createDestDir);
}
}
//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
/**
* Opens a {@link FileInputStream} for the specified file, providing better
* error messages than simply calling <code>new FileInputStream(file)</code>.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* </p>
* <p>
* An exception is thrown if the file does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be read.
* </p>
*
* @param file the file to open for input, must not be {@code null}
* @return a new {@link FileInputStream} for the specified file
* @throws FileNotFoundException if the file does not exist
* @throws IOException if the file object is a directory
* @throws IOException if the file cannot be read
* @since 1.3
*/
public static FileInputStream openInputStream(final File file) throws IOException {
if (file.exists()) {
if (file.isDirectory()) {
throw new IOException("File '" + file + "' exists but is a directory");
}
if (file.canRead() == false) {
throw new IOException("File '" + file + "' cannot be read");
}
} else {
throw new FileNotFoundException("File '" + file + "' does not exist");
}
return new FileInputStream(file);
}
//-----------------------------------------------------------------------
/**
* Opens a {@link FileOutputStream} for the specified file, checking and
* creating the parent directory if it does not exist.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* </p>
* <p>
* The parent directory will be created if it does not exist.
* The file will be created if it does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be written to.
* An exception is thrown if the parent directory cannot be created.
* </p>
*
* @param file the file to open for output, must not be {@code null}
* @return a new {@link FileOutputStream} for the specified file
* @throws IOException if the file object is a directory
* @throws IOException if the file cannot be written to
* @throws IOException if a parent directory needs creating but that fails
* @since 1.3
*/
public static FileOutputStream openOutputStream(final File file) throws IOException {
return openOutputStream(file, false);
}
/**
* Opens a {@link FileOutputStream} for the specified file, checking and
* creating the parent directory if it does not exist.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* </p>
* <p>
* The parent directory will be created if it does not exist.
* The file will be created if it does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be written to.
* An exception is thrown if the parent directory cannot be created.
* </p>
*
* @param file the file to open for output, must not be {@code null}
* @param append if {@code true}, then bytes will be added to the
* end of the file rather than overwriting
* @return a new {@link FileOutputStream} for the specified file
* @throws IOException if the file object is a directory
* @throws IOException if the file cannot be written to
* @throws IOException if a parent directory needs creating but that fails
* @since 2.1
*/
public static FileOutputStream openOutputStream(final File file, final boolean append) throws IOException {
if (file.exists()) {
if (file.isDirectory()) {
throw new IOException("File '" + file + "' exists but is a directory");
}
if (file.canWrite() == false) {
throw new IOException("File '" + file + "' cannot be written to");
}
} else {
final File parent = file.getParentFile();
if (parent != null) {
if (!parent.mkdirs() && !parent.isDirectory()) {
throw new IOException("Directory '" + parent + "' could not be created");
}
}
}
return new FileOutputStream(file, append);
}
/**
* Reads the contents of a file into a byte array.
* The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @return the file contents, never {@code null}
* @throws IOException in case of an I/O error
* @since 1.1
*/
public static byte[] readFileToByteArray(final File file) throws IOException {
try (InputStream in = openInputStream(file)) {
final long fileLength = file.length();
// file.length() may return 0 for system-dependent entities, treat 0 as unknown length - see IO-453
return fileLength > 0 ? IOUtils.toByteArray(in, fileLength) : IOUtils.toByteArray(in);
}
}
/**
* Reads the contents of a file into a String using the default encoding for the VM.
* The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @return the file contents, never {@code null}
* @throws IOException in case of an I/O error
* @since 1.3.1
* @deprecated 2.5 use {@link #readFileToString(File, Charset)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static String readFileToString(final File file) throws IOException {
return readFileToString(file, Charset.defaultCharset());
}
//-----------------------------------------------------------------------
/**
* Reads the contents of a file into a String.
* The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @param encoding the encoding to use, {@code null} means platform default
* @return the file contents, never {@code null}
* @throws IOException in case of an I/O error
* @since 2.3
*/
public static String readFileToString(final File file, final Charset encoding) throws IOException {
try (InputStream in = openInputStream(file)) {
return IOUtils.toString(in, Charsets.toCharset(encoding));
}
}
/**
* Reads the contents of a file into a String. The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @param encoding the encoding to use, {@code null} means platform default
* @return the file contents, never {@code null}
* @throws IOException in case of an I/O error
* @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io
* .UnsupportedEncodingException} in version 2.2 if the encoding is not supported.
* @since 2.3
*/
public static String readFileToString(final File file, final String encoding) throws IOException {
return readFileToString(file, Charsets.toCharset(encoding));
}
/**
* Reads the contents of a file line by line to a List of Strings using the default encoding for the VM.
* The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @return the list of Strings representing each line in the file, never {@code null}
* @throws IOException in case of an I/O error
* @since 1.3
* @deprecated 2.5 use {@link #readLines(File, Charset)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static List<String> readLines(final File file) throws IOException {
return readLines(file, Charset.defaultCharset());
}
/**
* Reads the contents of a file line by line to a List of Strings.
* The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @param encoding the encoding to use, {@code null} means platform default
* @return the list of Strings representing each line in the file, never {@code null}
* @throws IOException in case of an I/O error
* @since 2.3
*/
public static List<String> readLines(final File file, final Charset encoding) throws IOException {
try (InputStream in = openInputStream(file)) {
return IOUtils.readLines(in, Charsets.toCharset(encoding));
}
}
/**
* Reads the contents of a file line by line to a List of Strings. The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @param encoding the encoding to use, {@code null} means platform default
* @return the list of Strings representing each line in the file, never {@code null}
* @throws IOException in case of an I/O error
* @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 File file, final String encoding) throws IOException {
return readLines(file, Charsets.toCharset(encoding));
}
/**
* Returns a filter that accepts directories in addition to the {@link File} objects accepted by the given filter.
*
* @param dirFilter a base filter to add to
* @return a filter that accepts directories
*/
private static IOFileFilter setUpEffectiveDirFilter(final IOFileFilter dirFilter) {
return dirFilter == null ? FalseFileFilter.INSTANCE : FileFilterUtils.and(dirFilter,
DirectoryFileFilter.INSTANCE);
}
/**
* Returns a filter that accepts files in addition to the {@link File} objects accepted by the given filter.
*
* @param fileFilter a base filter to add to
* @return a filter that accepts files
*/
private static IOFileFilter setUpEffectiveFileFilter(final IOFileFilter fileFilter) {
return FileFilterUtils.and(fileFilter, FileFilterUtils.notFileFilter(DirectoryFileFilter.INSTANCE));
}
//-----------------------------------------------------------------------
/**
* Returns the size of the specified file or directory. If the provided
* {@link File} is a regular file, then the file's length is returned.
* If the argument is a directory, then the size of the directory is
* calculated recursively. If a directory or subdirectory is security
* restricted, its size will not be included.
* <p>
* Note that overflow is not detected, and the return value may be negative if
* overflow occurs. See {@link #sizeOfAsBigInteger(File)} for an alternative
* method that does not overflow.
* </p>
*
* @param file the regular file or directory to return the size
* of (must not be {@code null}).
*
* @return the length of the file, or recursive size of the directory,
* provided (in bytes).
*
* @throws NullPointerException if the file is {@code null}
* @throws IllegalArgumentException if the file does not exist.
*
* @since 2.0
*/
public static long sizeOf(final File file) {
if (!file.exists()) {
final String message = file + " does not exist";
throw new IllegalArgumentException(message);
}
if (file.isDirectory()) {
return sizeOfDirectory0(file); // private method; expects directory
}
return file.length();
}
/**
* the size of a file
* @param file the file to check
* @return the size of the file
*/
private static long sizeOf0(final File file) {
if (file.isDirectory()) {
return sizeOfDirectory0(file);
}
return file.length(); // will be 0 if file does not exist
}
/**
* Returns the size of the specified file or directory. If the provided
* {@link File} is a regular file, then the file's length is returned.
* If the argument is a directory, then the size of the directory is
* calculated recursively. If a directory or subdirectory is security
* restricted, its size will not be included.
*
* @param file the regular file or directory to return the size
* of (must not be {@code null}).
*
* @return the length of the file, or recursive size of the directory,
* provided (in bytes).
*
* @throws NullPointerException if the file is {@code null}
* @throws IllegalArgumentException if the file does not exist.
*
* @since 2.4
*/
public static BigInteger sizeOfAsBigInteger(final File file) {
if (!file.exists()) {
final String message = file + " does not exist";
throw new IllegalArgumentException(message);
}
if (file.isDirectory()) {
return sizeOfDirectoryBig0(file); // internal method
}
return BigInteger.valueOf(file.length());
}
/**
* Returns the size of a file
* @param fileOrDir The file
* @return the size
*/
private static BigInteger sizeOfBig0(final File fileOrDir) {
if (fileOrDir.isDirectory()) {
return sizeOfDirectoryBig0(fileOrDir);
}
return BigInteger.valueOf(fileOrDir.length());
}
/**
* Counts the size of a directory recursively (sum of the length of all files).
* <p>
* Note that overflow is not detected, and the return value may be negative if
* overflow occurs. See {@link #sizeOfDirectoryAsBigInteger(File)} for an alternative
* method that does not overflow.
* </p>
*
* @param directory directory to inspect, must not be {@code null}
* @return size of directory in bytes, 0 if directory is security restricted, a negative number when the real total
* is greater than {@link Long#MAX_VALUE}.
* @throws NullPointerException if the directory is {@code null}
*/
public static long sizeOfDirectory(final File directory) {
checkDirectory(directory);
return sizeOfDirectory0(directory);
}
/**
* the size of a director
* @param directory the directory to check
* @return the size
*/
private static long sizeOfDirectory0(final File directory) {
final File[] files = directory.listFiles();
if (files == null) { // null if security restricted
return 0L;
}
long size = 0;
for (final File file : files) {
if (!isSymlink(file)) {
size += sizeOf0(file); // internal method
if (size < 0) {
break;
}
}
}
return size;
}
/**
* Counts the size of a directory recursively (sum of the length of all files).
*
* @param directory directory to inspect, must not be {@code null}
* @return size of directory in bytes, 0 if directory is security restricted.
* @throws NullPointerException if the directory is {@code null}
* @since 2.4
*/
public static BigInteger sizeOfDirectoryAsBigInteger(final File directory) {
checkDirectory(directory);
return sizeOfDirectoryBig0(directory);
}
/**
* Finds the size of a directory
*
* @param directory The directory
* @return the size
*/
private static BigInteger sizeOfDirectoryBig0(final File directory) {
final File[] files = directory.listFiles();
if (files == null) { // null if security restricted
return BigInteger.ZERO;
}
BigInteger size = BigInteger.ZERO;
for (final File file : files) {
if (!isSymlink(file)) {
size = size.add(sizeOfBig0(file));
}
}
return size;
}
//-----------------------------------------------------------------------
/**
* Convert from a <code>URL</code> to a <code>File</code>.
* <p>
* From version 1.1 this method will decode the URL.
* Syntax such as <code>file:///my%20docs/file.txt</code> will be
* correctly decoded to <code>/my docs/file.txt</code>. Starting with version
* 1.5, this method uses UTF-8 to decode percent-encoded octets to characters.
* Additionally, malformed percent-encoded octets are handled leniently by
* passing them through literally.
* </p>
*
* @param url the file URL to convert, {@code null} returns {@code null}
* @return the equivalent <code>File</code> object, or {@code null}
* if the URL's protocol is not <code>file</code>
*/
public static File toFile(final URL url) {
if (url == null || !"file".equalsIgnoreCase(url.getProtocol())) {
return null;
}
String filename = url.getFile().replace('/', File.separatorChar);
filename = decodeUrl(filename);
return new File(filename);
}
/**
* Converts each of an array of <code>URL</code> to a <code>File</code>.
* <p>
* Returns an array of the same size as the input.
* If the input is {@code null}, an empty array is returned.
* If the input contains {@code null}, the output array contains {@code null} at the same
* index.
* </p>
* <p>
* This method will decode the URL.
* Syntax such as <code>file:///my%20docs/file.txt</code> will be
* correctly decoded to <code>/my docs/file.txt</code>.
* </p>
*
* @param urls the file URLs to convert, {@code null} returns empty array
* @return a non-{@code null} array of Files matching the input, with a {@code null} item
* if there was a {@code null} at that index in the input array
* @throws IllegalArgumentException if any file is not a URL file
* @throws IllegalArgumentException if any file is incorrectly encoded
* @since 1.1
*/
public static File[] toFiles(final URL... urls) {
if (urls == null || urls.length == 0) {
return EMPTY_FILE_ARRAY;
}
final File[] files = new File[urls.length];
for (int i = 0; i < urls.length; i++) {
final URL url = urls[i];
if (url != null) {
if (url.getProtocol().equals("file") == false) {
throw new IllegalArgumentException(
"URL could not be converted to a File: " + url);
}
files[i] = toFile(url);
}
}
return files;
}
//-----------------------------------------------------------------------
/**
* Converts an array of file extensions to suffixes for use
* with IOFileFilters.
*
* @param extensions an array of extensions. Format: {"java", "xml"}
* @return an array of suffixes. Format: {".java", ".xml"}
*/
private static String[] toSuffixes(final String... extensions) {
final String[] suffixes = new String[extensions.length];
for (int i = 0; i < extensions.length; i++) {
suffixes[i] = "." + extensions[i];
}
return suffixes;
}
//-----------------------------------------------------------------------
/**
* Implements the same behavior as the "touch" utility on Unix. It creates
* a new file with size 0 or, if the file exists already, it is opened and
* closed without modifying it, but updating the file date and time.
* <p>
* NOTE: As from v1.3, this method throws an IOException if the last
* modified date of the file cannot be set. Also, as from v1.3 this method
* creates parent directories if they do not exist.
* </p>
*
* @param file the File to touch
* @throws IOException If an I/O problem occurs
*/
public static void touch(final File file) throws IOException {
if (!file.exists()) {
openOutputStream(file).close();
}
final boolean success = file.setLastModified(System.currentTimeMillis());
if (!success) {
throw new IOException("Unable to set the last modification time for " + file);
}
}
/**
* Converts each of an array of <code>File</code> to a <code>URL</code>.
* <p>
* Returns an array of the same size as the input.
* </p>
*
* @param files the files to convert, must not be {@code null}
* @return an array of URLs matching the input
* @throws IOException if a file cannot be converted
* @throws NullPointerException if the parameter is null
*/
public static URL[] toURLs(final File... files) throws IOException {
final URL[] urls = new URL[files.length];
for (int i = 0; i < urls.length; i++) {
urls[i] = files[i].toURI().toURL();
}
return urls;
}
/**
* Validates the given arguments.
* <ul>
* <li>Throws {@link IllegalArgumentException} if {@code directory} is not a directory</li>
* <li>Throws {@link NullPointerException} if {@code fileFilter} is null</li>
* </ul>
*
* @param directory The File to test
* @param fileFilter The IOFileFilter to test
*/
private static void validateListFilesParameters(final File directory, final IOFileFilter fileFilter) {
if (!directory.isDirectory()) {
throw new IllegalArgumentException("Parameter 'directory' is not a directory: " + directory);
}
if (fileFilter == null) {
throw new NullPointerException("Parameter 'fileFilter' is null");
}
}
/**
* Validates the given arguments.
* <ul>
* <li>Throws {@link NullPointerException} if {@code src} is null</li>
* <li>Throws {@link NullPointerException} if {@code dest} is null</li>
* <li>Throws {@link FileNotFoundException} if {@code src} does not exist</li>
* </ul>
*
* @param src the file or directory to be moved
* @param dest the destination file or directory
* @throws FileNotFoundException if {@code src} file does not exist
*/
private static void validateMoveParameters(final File src, final File dest) throws FileNotFoundException {
if (src == null) {
throw new NullPointerException("Source must not be null");
}
if (dest == null) {
throw new NullPointerException("Destination must not be null");
}
if (!src.exists()) {
throw new FileNotFoundException("Source '" + src + "' does not exist");
}
}
/**
* Lists files in a directory, asserting that the supplied directory satisfies exists and is a directory.
*
* @param directory The directory to list
* @return The files in the directory, never null.
* @throws IOException if an I/O error occurs
*/
private static File[] verifiedListFiles(final File directory) throws IOException {
if (!directory.exists()) {
final String message = directory + " does not exist";
throw new IllegalArgumentException(message);
}
if (!directory.isDirectory()) {
final String message = directory + " is not a directory";
throw new IllegalArgumentException(message);
}
final File[] files = directory.listFiles();
if (files == null) { // null if security restricted
throw new IOException("Failed to list contents of " + directory);
}
return files;
}
//-----------------------------------------------------------------------
/**
* Waits for NFS to propagate a file creation, imposing a timeout.
* <p>
* This method repeatedly tests {@link File#exists()} until it returns
* true up to the maximum time specified in seconds.
* </p>
*
* @param file the file to check, must not be {@code null}
* @param seconds the maximum time in seconds to wait
* @return true if file exists
* @throws NullPointerException if the file is {@code null}
*/
public static boolean waitFor(final File file, final int seconds) {
final long finishAt = System.currentTimeMillis() + (seconds * 1000L);
boolean wasInterrupted = false;
try {
while (!file.exists()) {
final long remaining = finishAt - System.currentTimeMillis();
if (remaining < 0){
return false;
}
try {
Thread.sleep(Math.min(100, remaining));
} catch (final InterruptedException ignore) {
wasInterrupted = true;
} catch (final Exception ex) {
break;
}
}
} finally {
if (wasInterrupted) {
Thread.currentThread().interrupt();
}
}
return true;
}
/**
* Writes a CharSequence to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @throws IOException in case of an I/O error
* @since 2.0
* @deprecated 2.5 use {@link #write(File, CharSequence, Charset)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static void write(final File file, final CharSequence data) throws IOException {
write(file, data, Charset.defaultCharset(), false);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @param append if {@code true}, then the data will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
* @deprecated 2.5 use {@link #write(File, CharSequence, Charset, boolean)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static void write(final File file, final CharSequence data, final boolean append) throws IOException {
write(file, data, Charset.defaultCharset(), append);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, {@code null} means platform default
* @throws IOException in case of an I/O error
* @since 2.3
*/
public static void write(final File file, final CharSequence data, final Charset encoding) throws IOException {
write(file, data, encoding, false);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, {@code null} means platform default
* @param append if {@code true}, then the data will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.3
*/
public static void write(final File file, final CharSequence data, final Charset encoding, final boolean append)
throws IOException {
final String str = data == null ? null : data.toString();
writeStringToFile(file, str, encoding, append);
}
// Private method, must be invoked will a directory parameter
/**
* Writes a CharSequence to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, {@code null} means platform default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.0
*/
public static void write(final File file, final CharSequence data, final String encoding) throws IOException {
write(file, data, encoding, false);
}
// Internal method - does not check existence
/**
* Writes a CharSequence to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, {@code null} means platform default
* @param append if {@code true}, then the data will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io
* .UnsupportedEncodingException} in version 2.2 if the encoding is not supported by the VM
* @since 2.1
*/
public static void write(final File file, final CharSequence data, final String encoding, final boolean append)
throws IOException {
write(file, data, Charsets.toCharset(encoding), append);
}
/**
* Writes a byte array to a file creating the file if it does not exist.
* <p>
* NOTE: As from v1.3, the parent directories of the file will be created
* if they do not exist.
* </p>
*
* @param file the file to write to
* @param data the content to write to the file
* @throws IOException in case of an I/O error
* @since 1.1
*/
public static void writeByteArrayToFile(final File file, final byte[] data) throws IOException {
writeByteArrayToFile(file, data, false);
}
// Must be called with a directory
/**
* Writes a byte array to a file creating the file if it does not exist.
*
* @param file the file to write to
* @param data the content to write to the file
* @param append if {@code true}, then bytes will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
*/
public static void writeByteArrayToFile(final File file, final byte[] data, final boolean append)
throws IOException {
writeByteArrayToFile(file, data, 0, data.length, append);
}
// internal method; if file does not exist will return 0
/**
* Writes {@code len} bytes from the specified byte array starting
* at offset {@code off} to a file, creating the file if it does
* not exist.
*
* @param file the file to write to
* @param data the content to write to the file
* @param off the start offset in the data
* @param len the number of bytes to write
* @throws IOException in case of an I/O error
* @since 2.5
*/
public static void writeByteArrayToFile(final File file, final byte[] data, final int off, final int len)
throws IOException {
writeByteArrayToFile(file, data, off, len, false);
}
/**
* Writes {@code len} bytes from the specified byte array starting
* at offset {@code off} to a file, creating the file if it does
* not exist.
*
* @param file the file to write to
* @param data the content to write to the file
* @param off the start offset in the data
* @param len the number of bytes to write
* @param append if {@code true}, then bytes will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.5
*/
public static void writeByteArrayToFile(final File file, final byte[] data, final int off, final int len,
final boolean append) throws IOException {
try (OutputStream out = openOutputStream(file, append)) {
out.write(data, off, len);
}
}
/**
* Writes the <code>toString()</code> value of each item in a collection to
* the specified <code>File</code> line by line.
* The default VM encoding and the default line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, {@code null} entries produce blank lines
* @throws IOException in case of an I/O error
* @since 1.3
*/
public static void writeLines(final File file, final Collection<?> lines) throws IOException {
writeLines(file, null, lines, null, false);
}
/**
* Writes the <code>toString()</code> value of each item in a collection to
* the specified <code>File</code> line by line.
* The default VM encoding and the default line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, {@code null} entries produce blank lines
* @param append if {@code true}, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
*/
public static void writeLines(final File file, final Collection<?> lines, final boolean append) throws IOException {
writeLines(file, null, lines, null, append);
}
/**
* Writes the <code>toString()</code> value of each item in a collection to
* the specified <code>File</code> line by line.
* The default VM encoding and the specified line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, {@code null} entries produce blank lines
* @param lineEnding the line separator to use, {@code null} is system default
* @throws IOException in case of an I/O error
* @since 1.3
*/
public static void writeLines(final File file, final Collection<?> lines, final String lineEnding)
throws IOException {
writeLines(file, null, lines, lineEnding, false);
}
/**
* Writes the <code>toString()</code> value of each item in a collection to
* the specified <code>File</code> line by line.
* The default VM encoding and the specified line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, {@code null} entries produce blank lines
* @param lineEnding the line separator to use, {@code null} is system default
* @param append if {@code true}, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
*/
public static void writeLines(final File file, final Collection<?> lines, final String lineEnding,
final boolean append) throws IOException {
writeLines(file, null, lines, lineEnding, append);
}
/**
* Writes the <code>toString()</code> value of each item in a collection to
* the specified <code>File</code> line by line.
* The specified character encoding and the default line ending will be used.
* <p>
* NOTE: As from v1.3, the parent directories of the file will be created
* if they do not exist.
* </p>
*
* @param file the file to write to
* @param encoding the encoding to use, {@code null} means platform default
* @param lines the lines to write, {@code null} entries produce blank lines
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 1.1
*/
public static void writeLines(final File file, final String encoding, final Collection<?> lines)
throws IOException {
writeLines(file, encoding, lines, null, false);
}
/**
* Writes the <code>toString()</code> value of each item in a collection to
* the specified <code>File</code> line by line, optionally appending.
* The specified character encoding and the default line ending will be used.
*
* @param file the file to write to
* @param encoding the encoding to use, {@code null} means platform default
* @param lines the lines to write, {@code null} entries produce blank lines
* @param append if {@code true}, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.1
*/
public static void writeLines(final File file, final String encoding, final Collection<?> lines,
final boolean append) throws IOException {
writeLines(file, encoding, lines, null, append);
}
/**
* Writes the <code>toString()</code> value of each item in a collection to
* the specified <code>File</code> line by line.
* The specified character encoding and the line ending will be used.
* <p>
* NOTE: As from v1.3, the parent directories of the file will be created
* if they do not exist.
* </p>
*
* @param file the file to write to
* @param encoding the encoding to use, {@code null} means platform default
* @param lines the lines to write, {@code null} entries produce blank lines
* @param lineEnding the line separator to use, {@code null} is system default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 1.1
*/
public static void writeLines(final File file, final String encoding, final Collection<?> lines,
final String lineEnding) throws IOException {
writeLines(file, encoding, lines, lineEnding, false);
}
/**
* Writes the <code>toString()</code> value of each item in a collection to
* the specified <code>File</code> line by line.
* The specified character encoding and the line ending will be used.
*
* @param file the file to write to
* @param encoding the encoding to use, {@code null} means platform default
* @param lines the lines to write, {@code null} entries produce blank lines
* @param lineEnding the line separator to use, {@code null} is system default
* @param append if {@code true}, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.1
*/
public static void writeLines(final File file, final String encoding, final Collection<?> lines,
final String lineEnding, final boolean append) throws IOException {
try (OutputStream out = new BufferedOutputStream(openOutputStream(file, append))) {
IOUtils.writeLines(lines, lineEnding, out, encoding);
}
}
/**
* Writes a String to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @throws IOException in case of an I/O error
* @deprecated 2.5 use {@link #writeStringToFile(File, String, Charset)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static void writeStringToFile(final File file, final String data) throws IOException {
writeStringToFile(file, data, Charset.defaultCharset(), false);
}
/**
* Writes a String to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @param append if {@code true}, then the String will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
* @deprecated 2.5 use {@link #writeStringToFile(File, String, Charset, boolean)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static void writeStringToFile(final File file, final String data, final boolean append) throws IOException {
writeStringToFile(file, data, Charset.defaultCharset(), append);
}
/**
* Writes a String to a file creating the file if it does not exist.
* <p>
* NOTE: As from v1.3, the parent directories of the file will be created
* if they do not exist.
* </p>
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, {@code null} means platform default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.4
*/
public static void writeStringToFile(final File file, final String data, final Charset encoding)
throws IOException {
writeStringToFile(file, data, encoding, false);
}
/**
* Writes a String to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, {@code null} means platform default
* @param append if {@code true}, then the String will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.3
*/
public static void writeStringToFile(final File file, final String data, final Charset encoding,
final boolean append) throws IOException {
try (OutputStream out = openOutputStream(file, append)) {
IOUtils.write(data, out, encoding);
}
}
/**
* Writes a String to a file creating the file if it does not exist.
* <p>
* NOTE: As from v1.3, the parent directories of the file will be created
* if they do not exist.
* </p>
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, {@code null} means platform default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
*/
public static void writeStringToFile(final File file, final String data, final String encoding) throws IOException {
writeStringToFile(file, data, encoding, false);
}
/**
* Writes a String to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, {@code null} means platform default
* @param append if {@code true}, then the String will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.nio.charset.UnsupportedCharsetException thrown instead of {@link java.io
* .UnsupportedEncodingException} in version 2.2 if the encoding is not supported by the VM
* @since 2.1
*/
public static void writeStringToFile(final File file, final String data, final String encoding,
final boolean append) throws IOException {
writeStringToFile(file, data, Charsets.toCharset(encoding), append);
}
/**
* Instances should NOT be constructed in standard programming.
*/
public FileUtils() {
super();
}
}