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annotate src/org/tmatesoft/hg/internal/IntVector.java @ 587:a52f4cc56f9c

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Minimize vectors re-allocating when merging patches
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 26 Apr 2013 20:04:17 +0200
parents 88afffd39899
children f41dd9a3b8af
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 {
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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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60
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61 public int get(int i) {
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62 if (i < 0 || i >= count) {
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63 throw new IndexOutOfBoundsException(String.format("Index: %d, size: %d", i, count));
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64 }
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65 return data[i];
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66 }
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67
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68 public void set(int i, int v) {
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69 if (i < 0 || i >= count) {
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70 throw new IndexOutOfBoundsException(String.format("Index: %d, size: %d", i, count));
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71 }
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72 data[i] = v;
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73 }
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74
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75 public int size() {
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76 return count;
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77 }
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78
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79 public boolean isEmpty() {
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80 return count == 0;
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81 }
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82
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83 public void clear() {
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84 count = 0;
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85 }
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86
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87 public void trimTo(int newSize) {
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88 if (newSize < 0 || newSize > count) {
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89 throw new IllegalArgumentException(String.format("Can't trim vector of size %d to %d", count, newSize));
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90 }
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91 count = newSize;
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92 }
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93
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94 public void trimToSize() {
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95 data = toArray(true);
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96 }
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98
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99 public int[] toArray() {
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100 int[] rv = new int[count];
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101 System.arraycopy(data, 0, rv, 0, count);
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102 return rv;
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103 }
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105 public void reverse() {
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106 for (int a = 0, b = count-1; a < b; a++, b--) {
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107 int t = data[b];
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108 data[b] = data[a];
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109 data[a] = t;
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110 }
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111 }
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112
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113 /**
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114 *
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115 * @param ascending <code>true</code> to sort in ascending order, <code>false</code> for descending
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116 */
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117 public void sort(boolean ascending) {
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118 Arrays.sort(data, 0, count);
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119 if (!ascending) {
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120 reverse();
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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 @Override
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126 public String toString() {
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127 return String.format("%s[%d]", IntVector.class.getSimpleName(), size());
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128 }
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129
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130 /**
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131 * Use only when this instance won't be used any longer
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132 */
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133 @Experimental
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134 int[] toArray(boolean internalIfSizeMatchCapacity) {
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135 if (count == data.length) {
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136 return data;
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137 }
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138 return toArray();
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139 }
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140
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141 private void grow(int newCapacityHint) {
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142 if (increment == 0) {
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143 throw new UnsupportedOperationException("This vector is not allowed to expand");
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144 }
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145 int newCapacity = increment < 0 ? data.length << 1 : (data.length + increment);
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146 if (newCapacityHint > 0 && newCapacity < newCapacityHint) {
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147 newCapacity = newCapacityHint;
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148 }
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149 assert newCapacity > 0 && newCapacity != data.length : newCapacity;
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150 int[] newData = new int[newCapacity];
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151 System.arraycopy(data, 0, newData, 0, count);
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152 data = newData;
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153 }
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154 }