PositionInputStream.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.FilterInputStream;
36import java.io.IOException;
37import java.io.InputStream;
38
39/**
40 * InputStream that keeps track of total bytes read (in effect
41 * 'position' in stream) from the input stream.
42 *
43 */
44public class PositionInputStream extends FilterInputStream {
45    private long position = 0L;
46
47    public PositionInputStream(InputStream in) {
48        super(in);
49    }
50
51    public int read() throws IOException {
52        int res = super.read();
53        if (res != -1) position++;
54        return res;
55    }
56
57    public int read(byte[] b, int off, int len) throws IOException {
58        int res = super.read(b, off, len);
59        if (res != -1) position += res;
60        return res;
61    }
62
63    public long skip(long n) throws IOException {
64        long res = super.skip(n);
65        position += res;
66        return res;
67    }
68
69    public boolean markSupported() {
70        return false;
71    }
72
73    public void mark(int readLimit) {
74        throw new UnsupportedOperationException("mark");
75    }
76
77    public void reset() {
78        throw new UnsupportedOperationException("reset");
79    }
80
81    public long position() {
82        return position;
83    }
84}
85