01: /*
02: * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun in the LICENSE file that accompanied this code.
10: *
11: * This code is distributed in the hope that it will be useful, but WITHOUT
12: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14: * version 2 for more details (a copy is included in the LICENSE file that
15: * accompanied this code).
16: *
17: * You should have received a copy of the GNU General Public License version
18: * 2 along with this work; if not, write to the Free Software Foundation,
19: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20: *
21: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: /*
27: * The contents of this file are subject to the Sun Public License
28: * Version 1.0 (the "License"); you may not use this file except in
29: * compliance with the License. A copy of the License is available at
30: * http://www.sun.com/, and in the file LICENSE.html in the
31: * doc directory.
32: *
33: * The Original Code is HAT. The Initial Developer of the
34: * Original Code is Bill Foote, with contributions from others
35: * at JavaSoft/Sun. Portions created by Bill Foote and others
36: * at Javasoft/Sun are Copyright (C) 1997-2004. All Rights Reserved.
37: *
38: * In addition to the formal license, I ask that you don't
39: * change the history or donations files without permission.
40: *
41: */
42:
43: package com.sun.tools.hat.internal.parser;
44:
45: import java.io.DataInputStream;
46: import java.io.InputStream;
47:
48: /**
49: * A DataInputStream that keeps track of total bytes read
50: * (in effect 'position' in stream) so far.
51: *
52: * @author A. Sundararajan [jhat @(#)PositionDataInputStream.java 1.7 07/05/05]
53: */
54: public class PositionDataInputStream extends DataInputStream {
55: public PositionDataInputStream(InputStream in) {
56: super (in instanceof PositionInputStream ? in
57: : new PositionInputStream(in));
58: }
59:
60: public boolean markSupported() {
61: return false;
62: }
63:
64: public void mark(int readLimit) {
65: throw new UnsupportedOperationException("mark");
66: }
67:
68: public void reset() {
69: throw new UnsupportedOperationException("reset");
70: }
71:
72: public long position() {
73: return ((PositionInputStream) in).position();
74: }
75: }
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