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annotate src/org/tmatesoft/hg/internal/IntVector.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 694ebabb5cb3
children 15b406c7cd9d
rev   line source
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1 /*
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2 * Copyright (c) 2011 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 /**
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20 * Vector of primitive values
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21 *
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22 * @author Artem Tikhomirov
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23 * @author TMate Software Ltd.
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24 */
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25 public class IntVector {
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26
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27 private int[] data;
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28 private final int increment;
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29 private int count;
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30
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31
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32 public IntVector() {
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33 this(16, -1);
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34 }
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35
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36 // increment == -1: grow by power of two.
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37 // increment == 0: no resize (Exception will be thrown on attempt to add past capacity)
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38 public IntVector(int initialCapacity, int increment) {
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39 data = new int[initialCapacity];
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40 this.increment = increment;
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41 }
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42
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43 public void add(int v) {
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44 if (count == data.length) {
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45 grow();
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46 }
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47 data[count++] = v;
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48 }
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49
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50 public int get(int i) {
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51 if (i < 0 || i >= count) {
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52 throw new IndexOutOfBoundsException(String.format("Index: %d, size: %d", i, count));
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53 }
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54 return data[i];
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55 }
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56
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57 public int size() {
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58 return count;
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59 }
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60
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61 public void clear() {
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62 count = 0;
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63 }
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64
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65 public void trimToSize() {
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66 data = toArray(true);
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67 }
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68
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69
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70 public int[] toArray() {
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71 int[] rv = new int[count];
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72 System.arraycopy(data, 0, rv, 0, count);
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73 return rv;
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74 }
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75
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76 /**
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77 * Use only when this instance won't be used any longer
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78 */
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79 @Experimental
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80 int[] toArray(boolean internalIfSizeMatchCapacity) {
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81 if (count == data.length) {
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82 return data;
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83 }
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84 return toArray();
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85 }
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86
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87 private void grow() {
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88 if (increment == 0) {
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89 throw new UnsupportedOperationException("This vector is not allowed to expand");
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90 }
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91 int newCapacity = increment < 0 ? data.length << 1 : data.length + increment;
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92 assert newCapacity > 0 && newCapacity != data.length : newCapacity;
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93 int[] newData = new int[newCapacity];
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94 System.arraycopy(data, 0, newData, 0, count);
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95 data = newData;
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96 }
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97 }