/* * Copyright 1999-2005 The Apache Software Foundation. *  * Licensed 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.log4j.lf5.util;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;/** * Provides utility methods for input and output streams. * * @author Richard Wan */// Contributed by ThoughtWorks Inc.public abstract class StreamUtils {  //--------------------------------------------------------------------------  //   Constants:  //--------------------------------------------------------------------------  /**   * Default value is 2048.   */  public static final int DEFAULT_BUFFER_SIZE = 2048;  //--------------------------------------------------------------------------  //   Protected Variables:  //--------------------------------------------------------------------------  //--------------------------------------------------------------------------  //   Private Variables:  //--------------------------------------------------------------------------  //--------------------------------------------------------------------------  //   Constructors:  //--------------------------------------------------------------------------  //--------------------------------------------------------------------------  //   Public Methods:  //--------------------------------------------------------------------------  /**   * Copies information from the input stream to the output stream using   * a default buffer size of 2048 bytes.   * @throws java.io.IOException   */  public static void copy(InputStream input, OutputStream output)      throws IOException {    copy(input, output, DEFAULT_BUFFER_SIZE);  }  /**   * Copies information from the input stream to the output stream using   * the specified buffer size   * @throws java.io.IOException   */  public static void copy(InputStream input,      OutputStream output,      int bufferSize)      throws IOException {    byte[] buf = new byte[bufferSize];    int bytesRead = input.read(buf);    while (bytesRead != -1) {      output.write(buf, 0, bytesRead);      bytesRead = input.read(buf);    }    output.flush();  }  /**   * Copies information between specified streams and then closes   * both of the streams.   * @throws java.io.IOException   */  public static void copyThenClose(InputStream input, OutputStream output)      throws IOException {    copy(input, output);    input.close();    output.close();  }  /**   * @returns a byte[] containing the information contained in the   * specified InputStream.   * @throws java.io.IOException   */  public static byte[] getBytes(InputStream input)      throws IOException {    ByteArrayOutputStream result = new ByteArrayOutputStream();    copy(input, result);    result.close();    return result.toByteArray();  }  //--------------------------------------------------------------------------  //   Protected Methods:  //--------------------------------------------------------------------------  //--------------------------------------------------------------------------  //   Private Methods:  //--------------------------------------------------------------------------  //--------------------------------------------------------------------------  //   Nested Top-Level Classes or Interfaces  //--------------------------------------------------------------------------}