Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/IntVector.java @ 686:f1f095e42555

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 25 Jul 2013 22:12:14 +0200
parents 58a6900f845d
children
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 import java.util.Arrays;
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20
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21 /**
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22 * Vector of primitive values
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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 IntVector implements Cloneable {
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28
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29 private int[] data;
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30 private final int increment;
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31 private int count;
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32
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33
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34 public IntVector() {
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35 this(16, -1);
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36 }
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37
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38 // increment == -1: grow by power of two.
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39 // increment == 0: no resize (Exception will be thrown on attempt to add past capacity)
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40 public IntVector(int initialCapacity, int increment) {
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41 data = new int[initialCapacity];
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42 this.increment = increment;
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43 }
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44
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45 public void add(int v) {
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46 if (count == data.length) {
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47 grow(0);
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48 }
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49 data[count++] = v;
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50 }
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51
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52 public void add(int... values) {
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53 if (count + values.length > data.length) {
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54 grow(count + values.length);
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55 }
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56 for (int v : values) {
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57 data[count++] = v;
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58 }
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59 }
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61 public void addAll(IntVector other) {
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62 final int otherLen = other.count;
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63 if (count + otherLen > data.length) {
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64 grow(count + otherLen);
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65 }
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66 for (int i = 0; i < otherLen; i++) {
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67 data[count++] = other.data[i];
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68 }
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69 }
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70
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71 public int get(int i) {
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72 if (i < 0 || i >= count) {
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73 throw new IndexOutOfBoundsException(String.format("Index: %d, size: %d", i, count));
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74 }
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75 return data[i];
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76 }
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77
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78 public void set(int i, int v) {
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79 if (i < 0 || i >= count) {
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80 throw new IndexOutOfBoundsException(String.format("Index: %d, size: %d", i, count));
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81 }
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82 data[i] = v;
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83 }
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84
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85 public int size() {
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86 return count;
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87 }
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88
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89 public boolean isEmpty() {
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90 return count == 0;
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91 }
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92
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93 public void clear() {
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94 count = 0;
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95 }
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96
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97 public void trimTo(int newSize) {
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98 if (newSize < 0 || newSize > count) {
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99 throw new IllegalArgumentException(String.format("Can't trim vector of size %d to %d", count, newSize));
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100 }
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101 count = newSize;
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102 }
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103
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104 public void trimToSize() {
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105 data = toArray(true);
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106 }
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108
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109 public int[] toArray() {
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110 int[] rv = new int[count];
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111 System.arraycopy(data, 0, rv, 0, count);
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112 return rv;
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113 }
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115 public void reverse() {
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116 for (int a = 0, b = count-1; a < b; a++, b--) {
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117 int t = data[b];
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118 data[b] = data[a];
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119 data[a] = t;
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120 }
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121 }
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122
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123 /**
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124 *
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125 * @param ascending <code>true</code> to sort in ascending order, <code>false</code> for descending
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126 */
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127 public void sort(boolean ascending) {
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128 Arrays.sort(data, 0, count);
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129 if (!ascending) {
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130 reverse();
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131 }
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132 }
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133
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134
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135 @Override
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136 public String toString() {
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137 return String.format("%s[%d]", IntVector.class.getSimpleName(), size());
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138 }
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139
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140 @Override
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141 public IntVector clone() {
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142 try {
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143 return (IntVector) super.clone();
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144 } catch (CloneNotSupportedException ex) {
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145 throw new Error(ex);
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146 }
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147 }
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148
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149 /**
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150 * Use only when this instance won't be used any longer
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151 */
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152 int[] toArray(boolean internalIfSizeMatchCapacity) {
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153 if (count == data.length) {
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154 return data;
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155 }
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156 return toArray();
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157 }
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158
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159 private void grow(int newCapacityHint) {
288
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160 if (increment == 0) {
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161 throw new UnsupportedOperationException("This vector is not allowed to expand");
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162 }
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163 int newCapacity = increment < 0 ? data.length << 1 : (data.length + increment);
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164 if (newCapacityHint > 0 && newCapacity < newCapacityHint) {
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165 newCapacity = newCapacityHint;
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166 }
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167 assert newCapacity > 0 && newCapacity != data.length : newCapacity;
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168 int[] newData = new int[newCapacity];
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169 System.arraycopy(data, 0, newData, 0, count);
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170 data = newData;
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171 }
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172 }