Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/io/SeekableByteArrayOutputStream.java @ 4231:d713eaf4d288
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author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Thu, 05 Jan 2012 16:09:47 -0800 |
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1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.io; |
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24 |
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25 import java.io.*; |
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26 |
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27 /** |
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28 * A {@link ByteArrayOutputStream} that can have its write position {@linkplain #seek(int) updated}. |
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29 */ |
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30 public class SeekableByteArrayOutputStream extends ByteArrayOutputStream { |
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31 |
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32 private int highestCount; |
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33 |
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34 /** |
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35 * @see ByteArrayOutputStream#ByteArrayOutputStream() |
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36 */ |
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37 public SeekableByteArrayOutputStream() { |
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38 } |
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39 |
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40 /** |
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41 * @see ByteArrayOutputStream#ByteArrayOutputStream(int) |
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42 */ |
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43 public SeekableByteArrayOutputStream(int size) { |
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44 super(size); |
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45 } |
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46 |
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47 /** |
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48 * Updates the write position of this stream. The stream can only be repositioned between 0 and the |
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49 * {@linkplain #endOfStream() end of the stream}. |
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50 * |
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51 * @param index |
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52 * the index to which the write position of this stream will be set |
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53 * @throws IllegalArgumentException |
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54 * if {@code index > highestSeekIndex()} |
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55 */ |
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56 public void seek(int index) throws IllegalArgumentException { |
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57 if (endOfStream() < index) { |
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58 throw new IllegalArgumentException(); |
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59 } |
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60 count = index; |
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61 } |
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62 |
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63 /** |
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64 * Gets the index one past the highest index that has been written to in this stream. |
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65 */ |
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66 public int endOfStream() { |
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67 if (highestCount < count) { |
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68 highestCount = count; |
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69 } |
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70 return highestCount; |
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71 } |
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72 |
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73 @Override |
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74 public synchronized void reset() { |
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75 super.reset(); |
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76 highestCount = 0; |
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77 } |
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78 |
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79 /** |
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80 * Copies the {@code length} bytes of this byte array output stream starting at {@code offset} to {@code buf} |
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81 * starting at {@code bufOffset}. |
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82 */ |
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83 public void copyTo(int offset, byte[] toBuffer, int toOffset, int length) { |
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84 System.arraycopy(this.buf, offset, toBuffer, toOffset, length); |
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85 } |
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86 } |