Mercurial > hg > truffle

comparison graal/com.oracle.max.base/src/com/sun/max/io/SeekableByteArrayOutputStream.java @ 3733:e233f5660da4

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
parents
children bc8527f3071c
comparison
equal deleted inserted replaced
3732:3e2e8b8abdaf 3733:e233f5660da4
1 /*
2 * Copyright (c) 2007, 2011, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.sun.max.io;
24
25 import java.io.*;
26
27 /**
28 * A {@link ByteArrayOutputStream} that can have its write position {@linkplain #seek(int) updated}.
29 */
30 public class SeekableByteArrayOutputStream extends ByteArrayOutputStream {
31
32 private int highestCount;
33
34 /**
35 * @see ByteArrayOutputStream#ByteArrayOutputStream()
36 */
37 public SeekableByteArrayOutputStream() {
38 }
39
40 /**
41 * @see ByteArrayOutputStream#ByteArrayOutputStream(int)
42 */
43 public SeekableByteArrayOutputStream(int size) {
44 super(size);
45 }
46
47 /**
48 * Updates the write position of this stream. The stream can only be repositioned between 0 and the
49 * {@linkplain #endOfStream() end of the stream}.
50 *
51 * @param index
52 * the index to which the write position of this stream will be set
53 * @throws IllegalArgumentException
54 * if {@code index > highestSeekIndex()}
55 */
56 public void seek(int index) throws IllegalArgumentException {
57 if (endOfStream() < index) {
58 throw new IllegalArgumentException();
59 }
60 count = index;
61 }
62
63 /**
64 * Gets the index one past the highest index that has been written to in this stream.
65 */
66 public int endOfStream() {
67 if (highestCount < count) {
68 highestCount = count;
69 }
70 return highestCount;
71 }
72
73 @Override
74 public void reset() {
75 super.reset();
76 highestCount = 0;
77 }
78
79 /**
80 * Copies the {@code length} bytes of this byte array output stream starting at {@code offset} to {@code buf}
81 * starting at {@code bufOffset}.
82 */
83 public void copyTo(int offset, byte[] toBuffer, int toOffset, int length) {
84 System.arraycopy(this.buf, offset, toBuffer, toOffset, length);
85 }
86 }