1 /**************************************************************** 2 * Licensed to the Apache Software Foundation (ASF) under one * 3 * or more contributor license agreements. See the NOTICE file * 4 * distributed with this work for additional information * 5 * regarding copyright ownership. The ASF licenses this file * 6 * to you under the Apache License, Version 2.0 (the * 7 * "License"); you may not use this file except in compliance * 8 * with the License. You may obtain a copy of the License at * 9 * * 10 * http://www.apache.org/licenses/LICENSE-2.0 * 11 * * 12 * Unless required by applicable law or agreed to in writing, * 13 * software distributed under the License is distributed on an * 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * 15 * KIND, either express or implied. See the License for the * 16 * specific language governing permissions and limitations * 17 * under the License. * 18 ****************************************************************/ 19 20 21 22 package org.apache.james.util.stream; 23 24 import java.io.IOException; 25 import java.io.InputStream; 26 27 /** 28 * Reads data off a stream, printing every byte read to System.err. 29 */ 30 public class DebugInputStream extends InputStream { 31 32 /** 33 * The input stream being wrapped 34 */ 35 InputStream in = null; 36 37 /** 38 * Constructor that takes an InputStream to be wrapped. 39 * 40 * @param in the InputStream to be wrapped 41 */ 42 public DebugInputStream(InputStream in) { 43 this.in = in; 44 } 45 46 /** 47 * Read a byte off the stream 48 * 49 * @return the byte read off the stream 50 * @throws IOException if an exception is encountered when reading 51 */ 52 public int read() throws IOException { 53 int b = in.read(); 54 System.err.write(b); 55 return b; 56 } 57 58 /** 59 * @see java.io.InputStream#close() 60 */ 61 public void close() throws IOException { 62 in.close(); 63 } 64 }