| /** |
| * 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.camel.util; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.UnsupportedEncodingException; |
| import java.nio.charset.Charset; |
| |
| /** |
| * IO helper class. |
| * |
| * @version $Revision$ |
| */ |
| public final class IOHelper { |
| |
| private static final int DEFAULT_BUFFER_SIZE = 1024 * 4; |
| private static final Charset UTF8_CHARSET = Charset.forName("utf-8"); |
| |
| private IOHelper() { |
| //Utility Class |
| } |
| |
| /** |
| * Use this function instead of new String(byte[]) to avoid surprises from non-standard default encodings. |
| * @param bytes |
| * @return |
| */ |
| public static String newStringFromBytes(byte[] bytes) { |
| try { |
| return new String(bytes, UTF8_CHARSET.name()); |
| } catch (UnsupportedEncodingException e) { |
| throw |
| new RuntimeException("Impossible failure: Charset.forName(\"utf-8\") returns invalid name."); |
| |
| } |
| } |
| |
| /** |
| * Use this function instead of new String(byte[], int, int) |
| * to avoid surprises from non-standard default encodings. |
| * @param bytes |
| * @param start |
| * @param length |
| * @return |
| */ |
| public static String newStringFromBytes(byte[] bytes, int start, int length) { |
| try { |
| return new String(bytes, start, length, UTF8_CHARSET.name()); |
| } catch (UnsupportedEncodingException e) { |
| throw |
| new RuntimeException("Impossible failure: Charset.forName(\"utf-8\") returns invalid name."); |
| |
| } |
| } |
| |
| /** |
| * A factory method which creates an {@link IOException} from the given |
| * exception and message |
| */ |
| public static IOException createIOException(Throwable cause) { |
| return createIOException(cause.getMessage(), cause); |
| } |
| |
| /** |
| * A factory method which creates an {@link IOException} from the given |
| * exception and message |
| */ |
| public static IOException createIOException(String message, Throwable cause) { |
| IOException answer = new IOException(message); |
| answer.initCause(cause); |
| return answer; |
| } |
| |
| public static int copy(InputStream input, OutputStream output) throws IOException { |
| return copy(input, output, DEFAULT_BUFFER_SIZE); |
| } |
| |
| public static int copy(final InputStream input, final OutputStream output, int bufferSize) |
| throws IOException { |
| int avail = input.available(); |
| if (avail > 262144) { |
| avail = 262144; |
| } |
| if (avail > bufferSize) { |
| bufferSize = avail; |
| } |
| final byte[] buffer = new byte[bufferSize]; |
| int n = 0; |
| n = input.read(buffer); |
| int total = 0; |
| while (-1 != n) { |
| output.write(buffer, 0, n); |
| total += n; |
| n = input.read(buffer); |
| } |
| output.flush(); |
| return total; |
| } |
| |
| public static void copyAndCloseInput(InputStream input, OutputStream output) throws IOException { |
| copy(input, output); |
| input.close(); |
| } |
| |
| public static void copyAndCloseInput(InputStream input, OutputStream output, int bufferSize) throws IOException { |
| copy(input, output, bufferSize); |
| } |
| } |