1 /*
2 * $Source$
3 * $Revision$
4 *
5 * Copyright (C) 2000 William Chesters
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 * William Chesters <williamc At paneris.org>
42 * http://paneris.org/~williamc
43 * Obrechtstraat 114, 2517VX Den Haag, The Netherlands
44 */
45 package org.melati.util;
46
47 import java.io.Writer;
48 import java.io.PrintWriter;
49
50 /**
51 * A <code>PrintWriter</code> which knows how much it has written.
52 */
53 public class FtellPrintWriter extends PrintWriter {
54 protected long position = 0;
55
56 /**
57 * Constructor.
58 * @param writer to write to
59 */
60 public FtellPrintWriter(Writer writer) {
61 super(writer);
62 }
63
64 /**
65 * {@inheritDoc}
66 * @see java.io.PrintWriter#write(int)
67 */
68 public void write(int c) {
69 super.write(c);
70 ++position;
71 }
72
73 /**
74 * {@inheritDoc}
75 * @see java.io.PrintWriter#write(char[], int, int)
76 */
77 public void write(char buf[], int off, int len) {
78 super.write(buf, off, len);
79 position += len;
80 }
81
82 /**
83 * {@inheritDoc}
84 * @see java.io.PrintWriter#write(java.lang.String, int, int)
85 */
86 public void write(String buf, int off, int len) {
87 super.write(buf, off, len);
88 position += len;
89 }
90
91 /**
92 * @return number of characters written
93 */
94 public long ftell() {
95 return position;
96 }
97 }
98
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