KickJava   Java API By Example, From Geeks To Geeks.

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


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 output stream that tees off its output to a log file
48  *
49  * @author Stan Bailes
50  */
51
52 public class LogOutputStream extends OutputStream {
53     OutputStream out;
54     OutputStream log;
55     byte[] prefix;
56     boolean bol = true;
57
58     /**
59      * Construct a new log output stream
60      *
61      * @param os the underlying output stream
62      * @param log the log stream
63      * @param prefix a string identifying this log stream to be prefixed
64      * to every line output by this filter.
65      */
66     public LogOutputStream(OutputStream os, OutputStream log, String JavaDoc prefix) {
67     this.out = os;
68     this.log = log;
69     this.prefix = prefix.getBytes();
70     }
71
72     /**
73      * Write a byte.
74      *
75      * @param b the byte.
76      * @exception IOException may be thrown.
77      */
78     synchronized public void write(int b) throws IOException {
79     out.write(b);
80     if (bol) log.write(prefix);
81     log.write(b);
82     bol = (b == '\n');
83     }
84
85     /**
86      * Write a buffer
87      *
88      * @param b the buffer
89      * @param off the index of the first byte in the buffer to write.
90      * @param len the number of bytes to write.
91      *
92      * @exception IOException may be thrown.
93      */
94     synchronized public void write(byte[] b, int off, int len)
95     throws IOException
96     {
97     for (int i = 0; i < len; i++) write(b[off+i]);
98     }
99
100     /**
101      * Write a buffer
102      *
103      * @param b the buffer
104      *
105      * @exception IOException may be thrown.
106      */
107     synchronized public void write(byte[] b) throws IOException {
108     write(b, 0, b.length);
109     }
110
111     /**
112      * Close the underlying stream and the log output stream
113      *
114      * @exception IOException may be thrown
115      */
116     public void close() throws IOException {
117     out.close();
118     log.close();
119     }
120
121     /**
122      * Flush the underlying stream.
123      *
124      * @exception IOException may be thrown
125      */
126     public void flush() throws IOException {
127     out.flush();
128     }
129 }
130
Popular Tags