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Java > Open Source Codes > com > quadcap > io > LogInputStream


1 package com.quadcap.io;
2
3 /* Copyright 1997 - 2003 Quadcap Software. All rights reserved.
4  *
5  * This software is distributed under the Quadcap Free Software License.
6  * This software may be used or modified for any purpose, personal or
7  * commercial. Open Source redistributions are permitted. Commercial
8  * redistribution of larger works derived from, or works which bundle
9  * this software requires a "Commercial Redistribution License"; see
10  * http://www.quadcap.com/purchase.
11  *
12  * Redistributions qualify as "Open Source" under one of the following terms:
13  *
14  * Redistributions are made at no charge beyond the reasonable cost of
15  * materials and delivery.
16  *
17  * Redistributions are accompanied by a copy of the Source Code or by an
18  * irrevocable offer to provide a copy of the Source Code for up to three
19  * years at the cost of materials and delivery. Such redistributions
20  * must allow further use, modification, and redistribution of the Source
21  * Code under substantially the same terms as this license.
22  *
23  * Redistributions of source code must retain the copyright notices as they
24  * appear in each source code file, these license terms, and the
25  * disclaimer/limitation of liability set forth as paragraph 6 below.
26  *
27  * Redistributions in binary form must reproduce this Copyright Notice,
28  * these license terms, and the disclaimer/limitation of liability set
29  * forth as paragraph 6 below, in the documentation and/or other materials
30  * provided with the distribution.
31  *
32  * The Software is provided on an "AS IS" basis. No warranty is
33  * provided that the Software is free of defects, or fit for a
34  * particular purpose.
35  *
36  * Limitation of Liability. Quadcap Software shall not be liable
37  * for any damages suffered by the Licensee or any third party resulting
38  * from use of the Software.
39  */
40
41 import java.io.*;
42
43 import com.quadcap.util.Debug;
44 import com.quadcap.util.Util;
45
46 /**
47  * A filter input stream that tees off input into a log file, with an
48  * optional prefix for each line (delimited by newline), which can be
49  * used to identify the stream.
50  *
51  * @author Stan Bailes
52  */
53
54 public class LogInputStream extends InputStream {
55     InputStream in;
56     OutputStream log;
57     byte[] prefix;
58     boolean bol = true;
59     
60     /**
61      * Construct a new log input stream
62      *
63      * @param is the underlying input stream
64      * @param log the log stream
65      * @param prefix a string identifying this log stream to be prefixed
66      * to every line output by this filter.
67      */
68     public LogInputStream(InputStream is, OutputStream log, String JavaDoc prefix) {
69     this.in = is;
70     this.log = log;
71     this.prefix = prefix.getBytes();
72     }
73
74     /**
75      * Read (and log) a byte
76      *
77      * @exception IOException may be thrown
78      */
79     synchronized public int read() throws IOException {
80     int b = in.read();
81     if (bol) log.write(prefix);
82     log.write(b);
83     bol = (b == '\n');
84     return b;
85     }
86
87     /**
88      * Close the underlying stream and the log output stream
89      *
90      * @exception IOException may be thrown
91      */
92     public void close() throws IOException {
93     in.close();
94     log.close();
95     }
96 }
97
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