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annotate src/org/tmatesoft/hg/internal/IntVector.java @ 552:45751456b471

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 20 Feb 2013 22:23:50 +0100
parents 4ea0351ca878
children d3c71498919c
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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 /**
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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(0);
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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 void add(int... values) {
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51 if (count + values.length > data.length) {
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52 grow(count + values.length);
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53 }
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54 for (int v : values) {
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55 data[count++] = v;
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56 }
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57 }
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58
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59 public int get(int i) {
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60 if (i < 0 || i >= count) {
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61 throw new IndexOutOfBoundsException(String.format("Index: %d, size: %d", i, count));
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62 }
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63 return data[i];
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64 }
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65
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66 public void set(int i, int v) {
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67 if (i < 0 || i >= count) {
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68 throw new IndexOutOfBoundsException(String.format("Index: %d, size: %d", i, count));
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69 }
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70 data[i] = v;
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71 }
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72
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73 public int size() {
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74 return count;
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75 }
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76
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77 public boolean isEmpty() {
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78 return count == 0;
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79 }
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80
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81 public void clear() {
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82 count = 0;
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83 }
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84
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85 public void trimToSize() {
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86 data = toArray(true);
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87 }
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88
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89
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90 public int[] toArray() {
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91 int[] rv = new int[count];
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92 System.arraycopy(data, 0, rv, 0, count);
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93 return rv;
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94 }
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95
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96 public void reverse() {
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97 for (int a = 0, b = count-1; a < b; a++, b--) {
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98 int t = data[b];
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99 data[b] = data[a];
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100 data[a] = t;
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101 }
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102 }
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103
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104 @Override
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105 public String toString() {
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106 return String.format("%s[%d]", IntVector.class.getSimpleName(), size());
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107 }
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108
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109 /**
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110 * Use only when this instance won't be used any longer
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111 */
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112 @Experimental
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113 int[] toArray(boolean internalIfSizeMatchCapacity) {
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114 if (count == data.length) {
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115 return data;
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116 }
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117 return toArray();
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118 }
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119
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120 private void grow(int newCapacityHint) {
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121 if (increment == 0) {
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122 throw new UnsupportedOperationException("This vector is not allowed to expand");
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123 }
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124 int newCapacity = increment < 0 ? data.length << 1 : data.length + increment;
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125 if (newCapacityHint > 0 && newCapacity < newCapacityHint) {
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126 newCapacity = newCapacityHint;
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127 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
128 assert newCapacity > 0 && newCapacity != data.length : newCapacity;
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
129 int[] newData = new int[newCapacity];
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
130 System.arraycopy(data, 0, newData, 0, count);
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
131 data = newData;
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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132 }
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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133 }