Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/ByteVector.java @ 671:002ed1b2baad
AIOOBE in BundleGenerator.ChunkGenerator.iterate when there are no outgoing changes on push
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Fri, 12 Jul 2013 15:29:37 +0200 (2013-07-12) |
parents | 88afffd39899 |
children | a62079bc422b |
rev | line source |
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88afffd39899
Improve memory consumption of HgManifest#getFileRevision(): avoid extra byte[] instances
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1 /* |
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2 * Copyright (c) 2013 TMate Software Ltd |
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3 * |
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4 * This program is free software; you can redistribute it and/or modify |
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5 * it under the terms of the GNU General Public License as published by |
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6 * the Free Software Foundation; version 2 of the License. |
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7 * |
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8 * This program is distributed in the hope that it will be useful, |
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 * GNU General Public License for more details. |
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12 * |
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13 * For information on how to redistribute this software under |
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14 * the terms of a license other than GNU General Public License |
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15 * contact TMate Software at support@hg4j.com |
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16 */ |
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17 package org.tmatesoft.hg.internal; |
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18 |
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19 import java.io.ByteArrayOutputStream; |
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20 |
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21 /** |
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22 * Alternative to {@link ByteArrayOutputStream}, with extra operation that prevent extra byte[] instances |
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23 * |
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24 * @author Artem Tikhomirov |
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25 * @author TMate Software Ltd. |
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26 */ |
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27 public class ByteVector { |
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28 private byte[] data; |
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29 private int count; |
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30 private final int increment; |
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31 |
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32 |
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33 public ByteVector(int initialSize, int increment) { |
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34 data = new byte[initialSize]; |
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35 this.increment = increment; |
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36 } |
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37 |
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38 public void add(int b) { |
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39 if (count == data.length) { |
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40 byte[] newData = new byte[count + increment]; |
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41 System.arraycopy(data, 0, newData, 0, count); |
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42 data = newData; |
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43 } |
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44 data[count++] = (byte) b; |
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45 } |
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46 |
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47 public int size() { |
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48 return count; |
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49 } |
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50 |
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51 public void clear() { |
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52 count = 0; |
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53 } |
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54 |
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55 public boolean equalsTo(byte[] array) { |
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56 if (array == null || array.length != count) { |
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57 return false; |
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58 } |
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59 for (int i = 0; i < count; i++) { |
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60 if (data[i] != array[i]) { |
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61 return false; |
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62 } |
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63 } |
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64 return true; |
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65 } |
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66 |
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67 /** |
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68 * Copies content of this vector into destination array. |
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69 * @param destination array, greater or equal to {@link #size()} of the vector |
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70 */ |
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71 public void copyTo(byte[] destination) { |
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72 if (destination == null || destination.length < count) { |
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73 throw new IllegalArgumentException(); |
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74 } |
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75 System.arraycopy(data, 0, destination, 0, count); |
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76 } |
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77 |
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78 public byte[] toByteArray() { |
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79 byte[] rv = new byte[count]; |
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80 copyTo(rv); |
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81 return rv; |
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82 } |
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83 } |