Mercurial > hg > truffle
comparison graal/com.oracle.max.base/src/com/sun/max/io/SeekableByteArrayOutputStream.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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3732:3e2e8b8abdaf | 3733:e233f5660da4 |
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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 } |