View Javadoc

1   /************************************************************************
2    * Copyright (c) 2000-2006 The Apache Software Foundation.             *
3    * All rights reserved.                                                *
4    * ------------------------------------------------------------------- *
5    * Licensed under the Apache License, Version 2.0 (the "License"); you *
6    * may not use this file except in compliance with the License. You    *
7    * may obtain a copy of the License at:                                *
8    *                                                                     *
9    *     http://www.apache.org/licenses/LICENSE-2.0                      *
10   *                                                                     *
11   * Unless required by applicable law or agreed to in writing, software *
12   * distributed under the License is distributed on an "AS IS" BASIS,   *
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or     *
14   * implied.  See the License for the specific language governing       *
15   * permissions and limitations under the License.                      *
16   ***********************************************************************/
17  
18  package org.apache.james.util;
19  
20  import java.io.IOException;
21  import java.io.InputStream;
22  
23  /***
24   * Reads data off a stream, printing every byte read to System.err.
25   */
26  public class DebugInputStream extends InputStream {
27  
28      /***
29       * The input stream being wrapped
30       */
31      InputStream in = null;
32  
33      /***
34       * Constructor that takes an InputStream to be wrapped.
35       *
36       * @param in the InputStream to be wrapped
37       */
38      public DebugInputStream(InputStream in) {
39          this.in = in;
40      }
41  
42      /***
43       * Read a byte off the stream
44       *
45       * @return the byte read off the stream
46       * @throws IOException if an exception is encountered when reading
47       */
48      public int read() throws IOException {
49          int b = in.read();
50          System.err.write(b);
51          return b;
52      }
53  
54      /***
55       * Close the stream
56       *
57       * @throws IOException if an exception is encountered when closing
58       */
59      public void close() throws IOException {
60          in.close();
61      }
62  }