1 |
771 |
jeremybenn |
/* FilterWriter.java -- Parent class for output streams that filter
|
2 |
|
|
Copyright (C) 1998, 1999, 2001, 2003, 2005 Free Software Foundation, Inc.
|
3 |
|
|
|
4 |
|
|
This file is part of GNU Classpath.
|
5 |
|
|
|
6 |
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
7 |
|
|
it under the terms of the GNU General Public License as published by
|
8 |
|
|
the Free Software Foundation; either version 2, or (at your option)
|
9 |
|
|
any later version.
|
10 |
|
|
|
11 |
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
12 |
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
13 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
14 |
|
|
General Public License for more details.
|
15 |
|
|
|
16 |
|
|
You should have received a copy of the GNU General Public License
|
17 |
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
18 |
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
19 |
|
|
02110-1301 USA.
|
20 |
|
|
|
21 |
|
|
Linking this library statically or dynamically with other modules is
|
22 |
|
|
making a combined work based on this library. Thus, the terms and
|
23 |
|
|
conditions of the GNU General Public License cover the whole
|
24 |
|
|
combination.
|
25 |
|
|
|
26 |
|
|
As a special exception, the copyright holders of this library give you
|
27 |
|
|
permission to link this library with independent modules to produce an
|
28 |
|
|
executable, regardless of the license terms of these independent
|
29 |
|
|
modules, and to copy and distribute the resulting executable under
|
30 |
|
|
terms of your choice, provided that you also meet, for each linked
|
31 |
|
|
independent module, the terms and conditions of the license of that
|
32 |
|
|
module. An independent module is a module which is not derived from
|
33 |
|
|
or based on this library. If you modify this library, you may extend
|
34 |
|
|
this exception to your version of the library, but you are not
|
35 |
|
|
obligated to do so. If you do not wish to do so, delete this
|
36 |
|
|
exception statement from your version. */
|
37 |
|
|
|
38 |
|
|
|
39 |
|
|
package java.io;
|
40 |
|
|
|
41 |
|
|
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
|
42 |
|
|
* "The Java Language Specification", ISBN 0-201-63451-1
|
43 |
|
|
* Status: Complete to version 1.1.
|
44 |
|
|
*/
|
45 |
|
|
|
46 |
|
|
/**
|
47 |
|
|
* This class is the common superclass of output character stream classes
|
48 |
|
|
* that filter the output they write. These classes typically transform the
|
49 |
|
|
* data in some way prior to writing it out to another underlying
|
50 |
|
|
* <code>Writer</code>. This class simply overrides all the
|
51 |
|
|
* methods in <code>Writer</code> to redirect them to the
|
52 |
|
|
* underlying stream. Subclasses provide actual filtering.
|
53 |
|
|
*
|
54 |
|
|
* @author Aaron M. Renn (arenn@urbanophile.com)
|
55 |
|
|
* @author Tom Tromey (tromey@cygnus.com)
|
56 |
|
|
*/
|
57 |
|
|
public abstract class FilterWriter extends Writer
|
58 |
|
|
{
|
59 |
|
|
/**
|
60 |
|
|
* This is the subordinate <code>Writer</code> that this class
|
61 |
|
|
* redirects its method calls to.
|
62 |
|
|
*/
|
63 |
|
|
protected Writer out;
|
64 |
|
|
|
65 |
|
|
/**
|
66 |
|
|
* This method initializes an instance of <code>FilterWriter</code>
|
67 |
|
|
* to write to the specified subordinate <code>Writer</code>.
|
68 |
|
|
* The given <code>Writer</code> will be used as <code>lock</code> for
|
69 |
|
|
* the newly created <code>FilterWriter</code>.
|
70 |
|
|
*
|
71 |
|
|
* @param out The <code>Writer</code> to write to
|
72 |
|
|
*/
|
73 |
|
|
protected FilterWriter(Writer out)
|
74 |
|
|
{
|
75 |
|
|
super(out.lock);
|
76 |
|
|
this.out = out;
|
77 |
|
|
}
|
78 |
|
|
|
79 |
|
|
/**
|
80 |
|
|
* This method closes the underlying <code>Writer</code>. Any
|
81 |
|
|
* further attempts to write to this stream may throw an exception.
|
82 |
|
|
*
|
83 |
|
|
* @exception IOException If an error occurs
|
84 |
|
|
*/
|
85 |
|
|
public void close() throws IOException
|
86 |
|
|
{
|
87 |
|
|
out.close();
|
88 |
|
|
}
|
89 |
|
|
|
90 |
|
|
/**
|
91 |
|
|
* This method attempt to flush all buffered output to be written to the
|
92 |
|
|
* underlying output sink.
|
93 |
|
|
*
|
94 |
|
|
* @exception IOException If an error occurs
|
95 |
|
|
*/
|
96 |
|
|
public void flush() throws IOException
|
97 |
|
|
{
|
98 |
|
|
out.flush();
|
99 |
|
|
}
|
100 |
|
|
|
101 |
|
|
/**
|
102 |
|
|
* This method writes a single char of output to the underlying
|
103 |
|
|
* <code>Writer</code>.
|
104 |
|
|
*
|
105 |
|
|
* @param b The char to write, passed as an int.
|
106 |
|
|
*
|
107 |
|
|
* @exception IOException If an error occurs
|
108 |
|
|
*/
|
109 |
|
|
public void write(int b) throws IOException
|
110 |
|
|
{
|
111 |
|
|
out.write(b);
|
112 |
|
|
}
|
113 |
|
|
|
114 |
|
|
/**
|
115 |
|
|
* This method writes <code>len</code> chars from the array <code>buf</code>
|
116 |
|
|
* starting at index <code>offset</code> to the underlying
|
117 |
|
|
* <code>Writer</code>.
|
118 |
|
|
*
|
119 |
|
|
* @param buf The char array to write chars from
|
120 |
|
|
* @param offset The index into the array to start writing chars from
|
121 |
|
|
* @param len The number of chars to write
|
122 |
|
|
*
|
123 |
|
|
* @exception IOException If an error occurs
|
124 |
|
|
*/
|
125 |
|
|
public void write(char[] buf, int offset, int len) throws IOException
|
126 |
|
|
{
|
127 |
|
|
out.write(buf, offset, len);
|
128 |
|
|
}
|
129 |
|
|
|
130 |
|
|
/**
|
131 |
|
|
* This method writes <code>len</code> chars from the <code>String</code>
|
132 |
|
|
* starting at position <code>offset</code>.
|
133 |
|
|
*
|
134 |
|
|
* @param str The <code>String</code> that is to be written
|
135 |
|
|
* @param offset The character offset into the <code>String</code>
|
136 |
|
|
* to start writing from
|
137 |
|
|
* @param len The number of chars to write
|
138 |
|
|
*
|
139 |
|
|
* @exception IOException If an error occurs
|
140 |
|
|
*/
|
141 |
|
|
public void write(String str, int offset, int len) throws IOException
|
142 |
|
|
{
|
143 |
|
|
out.write(str, offset, len);
|
144 |
|
|
}
|
145 |
|
|
|
146 |
|
|
} // class FilterWriter
|