KickJava   Java API By Example, From Geeks To Geeks.

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


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.IOException JavaDoc;
42 import java.io.Reader JavaDoc;
43 import java.io.Writer JavaDoc;
44
45 import com.quadcap.util.Debug;
46 import com.quadcap.util.Util;
47
48 /**
49  * A filter writer that tees off output into a log file, with a prefix
50  * identifying the stream.
51  *
52  * @author Stan Bailes
53  */
54
55 public class LogWriter extends Writer JavaDoc {
56     Writer JavaDoc out;
57     Writer JavaDoc log;
58     String JavaDoc prefix;
59     boolean bol = true;
60     
61     /**
62      * Construct a new log reader
63      *
64      * @param is the underlying reader
65      * @param log the log stream
66      * @param prefix a string identifying this log stream to be prefixed
67      * to every line output by this filter.
68      */
69     public LogWriter(Writer JavaDoc out, Writer JavaDoc log, String JavaDoc prefix) {
70     this.out = out;
71     this.log = log;
72     this.prefix = prefix;
73     }
74
75     /**
76      * Read (and log) a byte
77      *
78      * @exception IOException may be thrown
79      */
80     synchronized public void write(int c) throws IOException JavaDoc {
81     out.write((char)c);
82     if (bol) log.write(prefix);
83     log.write((char)c);
84     bol = (c == '\n');
85     }
86
87     /**
88      * Read (and log) an array of bytes
89      */
90     public void write(char[] cbuf, int off, int len) throws IOException JavaDoc {
91         for (int i = 0; i < len; i++) {
92             write(cbuf[off + i]);
93         }
94     }
95
96     /**
97      * Flush the underlying stream(s)
98      */
99     public void flush() throws IOException JavaDoc {
100         out.flush();
101         log.flush();
102     }
103
104     /**
105      * Close the underlying stream (but not the log stream!)
106      *
107      * @exception IOException may be thrown
108      */
109     public void close() throws IOException JavaDoc {
110     out.close();
111     }
112 }
113
Popular Tags