PositionDataInputStream.java revision 2224:2a8815d86b93 
1/*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26
27/*
28 * The Original Code is HAT. The Initial Developer of the
29 * Original Code is Bill Foote, with contributions from others
30 * at JavaSoft/Sun.
31 */
32
33package jdk.test.lib.hprof.parser;
34
35import java.io.DataInputStream;
36import java.io.InputStream;
37
38/**
39 * A DataInputStream that keeps track of total bytes read
40 * (in effect 'position' in stream) so far.
41 *
42 */
43public class PositionDataInputStream extends DataInputStream {
44    public PositionDataInputStream(InputStream in) {
45        super(in instanceof PositionInputStream?
46              in : new PositionInputStream(in));
47    }
48
49    public boolean markSupported() {
50        return false;
51    }
52
53    public void mark(int readLimit) {
54        throw new UnsupportedOperationException("mark");
55    }
56
57    public void reset() {
58        throw new UnsupportedOperationException("reset");
59    }
60
61    public long position() {
62        return ((PositionInputStream)in).position();
63    }
64}
65