1 /*
2 * $Source$
3 * $Revision$
4 *
5 * Copyright (C) 2001 Myles Chippendale
6 *
7 * Part of Melati (http://melati.org), a framework for the rapid
8 * development of clean, maintainable web applications.
9 *
10 * Melati is free software; Permission is granted to copy, distribute
11 * and/or modify this software under the terms either:
12 *
13 * a) the GNU General Public License as published by the Free Software
14 * Foundation; either version 2 of the License, or (at your option)
15 * any later version,
16 *
17 * or
18 *
19 * b) any version of the Melati Software License, as published
20 * at http://melati.org
21 *
22 * You should have received a copy of the GNU General Public License and
23 * the Melati Software License along with this program;
24 * if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
26 * GNU General Public License and visit http://melati.org to obtain the
27 * Melati Software License.
28 *
29 * Feel free to contact the Developers of Melati (http://melati.org),
30 * if you would like to work out a different arrangement than the options
31 * outlined here. It is our intention to allow Melati to be used by as
32 * wide an audience as possible.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * Contact details for copyright holder:
40 *
41 * Myles Chippendale <mylesc At paneris.org>
42 */
43 package org.melati.util;
44
45 import java.io.Writer;
46 import java.io.FilterWriter;
47 import java.io.IOException;
48
49 /**
50 * A <code>FilterWriter</code> which knows how much it has written.
51 */
52 public class FtellWriter extends FilterWriter {
53 protected long position = 0;
54
55 /**
56 * Constructor.
57 * @param writer Underlying writer
58 */
59 public FtellWriter(Writer writer) {
60 super(writer);
61 }
62
63 /**
64 * {@inheritDoc}
65 * @see java.io.FilterWriter#write(int)
66 */
67 public void write(int c) throws IOException {
68 out.write(c);
69 ++position;
70 }
71
72 /**
73 * {@inheritDoc}
74 * @see java.io.FilterWriter#write(char[], int, int)
75 */
76 public void write(char buf[], int off, int len) throws IOException {
77 out.write(buf, off, len);
78 position += len;
79 }
80
81 /**
82 * {@inheritDoc}
83 * @see java.io.FilterWriter#write(java.lang.String, int, int)
84 */
85 public void write(String buf, int off, int len) throws IOException {
86 out.write(buf, off, len);
87 position += len;
88 }
89
90 /**
91 * @return number of characters written
92 */
93 public long ftell() {
94 return position;
95 }
96 }