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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  package org.apache.james.util;
21  
22  import java.io.IOException;
23  import java.io.InputStream;
24  
25  /***
26   * Reads data off a stream, printing every byte read to System.err.
27   */
28  public class DebugInputStream extends InputStream {
29  
30      /***
31       * The input stream being wrapped
32       */
33      InputStream in = null;
34  
35      /***
36       * Constructor that takes an InputStream to be wrapped.
37       *
38       * @param in the InputStream to be wrapped
39       */
40      public DebugInputStream(InputStream in) {
41          this.in = in;
42      }
43  
44      /***
45       * Read a byte off the stream
46       *
47       * @return the byte read off the stream
48       * @throws IOException if an exception is encountered when reading
49       */
50      public int read() throws IOException {
51          int b = in.read();
52          System.err.write(b);
53          return b;
54      }
55  
56      /***
57       * Close the stream
58       *
59       * @throws IOException if an exception is encountered when closing
60       */
61      public void close() throws IOException {
62          in.close();
63      }
64  }