01: package com.quadcap.io;
02:
03: /* Copyright 1997 - 2003 Quadcap Software. All rights reserved.
04: *
05: * This software is distributed under the Quadcap Free Software License.
06: * This software may be used or modified for any purpose, personal or
07: * commercial. Open Source redistributions are permitted. Commercial
08: * redistribution of larger works derived from, or works which bundle
09: * 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,
69: String prefix) {
70: this .in = is;
71: this .log = log;
72: this .prefix = prefix.getBytes();
73: }
74:
75: /**
76: * Read (and log) a byte
77: *
78: * @exception IOException may be thrown
79: */
80: synchronized public int read() throws IOException {
81: int b = in.read();
82: if (bol)
83: log.write(prefix);
84: log.write(b);
85: bol = (b == '\n');
86: return b;
87: }
88:
89: /**
90: * Close the underlying stream and the log output stream
91: *
92: * @exception IOException may be thrown
93: */
94: public void close() throws IOException {
95: in.close();
96: log.close();
97: }
98: }
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