KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > columba > ristretto > log > LogOutputStream


1 /* ***** BEGIN LICENSE BLOCK *****
2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
3  *
4  * The contents of this file are subject to the Mozilla Public License Version
5  * 1.1 (the "License"); you may not use this file except in compliance with
6  * the License. You may obtain a copy of the License at
7  * http://www.mozilla.org/MPL/
8  *
9  * Software distributed under the License is distributed on an "AS IS" basis,
10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
11  * for the specific language governing rights and limitations under the
12  * License.
13  *
14  * The Original Code is Ristretto Mail API.
15  *
16  * The Initial Developers of the Original Code are
17  * Timo Stich and Frederik Dietz.
18  * Portions created by the Initial Developers are Copyright (C) 2004
19  * All Rights Reserved.
20  *
21  * Contributor(s):
22  *
23  * Alternatively, the contents of this file may be used under the terms of
24  * either the GNU General Public License Version 2 or later (the "GPL"), or
25  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
26  * in which case the provisions of the GPL or the LGPL are applicable instead
27  * of those above. If you wish to allow use of your version of this file only
28  * under the terms of either the GPL or the LGPL, and not to allow others to
29  * use your version of this file under the terms of the MPL, indicate your
30  * decision by deleting the provisions above and replace them with the notice
31  * and other provisions required by the GPL or the LGPL. If you do not delete
32  * the provisions above, a recipient may use your version of this file under
33  * the terms of any one of the MPL, the GPL or the LGPL.
34  *
35  * ***** END LICENSE BLOCK ***** */
36 package org.columba.ristretto.log;
37
38 import java.io.FilterOutputStream JavaDoc;
39 import java.io.IOException JavaDoc;
40 import java.io.OutputStream JavaDoc;
41
42 /**
43  * OutputStream that logs all data that goes
44  * through it.
45  *
46  * @author tstich
47  *
48  */
49 public class LogOutputStream extends FilterOutputStream JavaDoc {
50     private static final byte[] PREFIX_STRING = { 'C', ':', ' ' };
51     
52     private static final int LINEEND = 0;
53     private static final int IN_LINE = 1;
54     
55     private static final int MAX_LENGTH = 100 - PREFIX_STRING.length;
56     
57     private int state;
58     private int line_length;
59     
60     private OutputStream JavaDoc logOutputStream;
61     
62     /**
63      * Constructs the LogOutputStream.java.
64      *
65      * @param arg0
66      * @param logStream Stream to log to (eg System.out)
67      */
68     public LogOutputStream(OutputStream JavaDoc arg0, OutputStream JavaDoc logStream) {
69         super(arg0);
70         this.logOutputStream =logStream;
71     }
72     
73     /**
74      * Constructs the LogOutputStream.java.
75      *
76      * @param arg0
77      */
78     public LogOutputStream(OutputStream JavaDoc arg0) {
79         this( arg0, System.out );
80     }
81     
82
83     /**
84      * @see java.io.OutputStream#write(byte[], int, int)
85      */
86     public void write(byte[] arg0, int arg1, int arg2) throws IOException JavaDoc {
87         for( int i=arg1; i<arg2+arg1; i++) {
88                write((int)(0x0ff & arg0[i]));
89         }
90     }
91
92     /**
93      * @see java.io.OutputStream#write(int)
94      */
95     public void write(int write) throws IOException JavaDoc {
96
97         switch( state ) {
98         case( LINEEND ) : {
99             line_length = 0;
100             state = IN_LINE;
101             
102             // if something follows first print the prefix
103 if( write != -1 ) {
104                 logOutputStream.write(PREFIX_STRING);
105             }
106             
107             break;
108         }
109         
110         case( IN_LINE ) : {
111             line_length++;
112             
113             // check for line ends
114 if( write == '\n' ) {
115                 state = LINEEND;
116             } else if( line_length ==MAX_LENGTH) {
117                 // check for long lines
118 line_length = 0;
119                 logOutputStream.write('\\');
120                 logOutputStream.write('\n');
121                 logOutputStream.write( PREFIX_STRING);
122             }
123             
124             break;
125         }
126         }
127         
128         if( write != -1 ) {
129             logOutputStream.write(write);
130         }
131         
132         out.write(write);
133     }
134
135 }
136
Popular Tags