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annotate src/org/tmatesoft/hg/internal/IntMap.java @ 448:2e402c12ebc6 smartgit3

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Issue 31: Revlog#walk() fails with AIOOBE when start > 0
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 06 Jun 2012 21:23:57 +0200
parents 81e9a3c9bafe
children 7bcfbc255f48
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 import java.util.NoSuchElementException;
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20
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21
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22 /**
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23 * Map implementation that uses plain int keys and performs with log n effectiveness.
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24 * May contain null values
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25 *
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26 * @author Artem Tikhomirov
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27 * @author TMate Software Ltd.
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28 */
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29 public class IntMap<V> {
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30
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31 private int[] keys;
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32 private Object[] values;
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33 private int size;
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34
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35 public IntMap(int size) {
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36 keys = new int[size <= 0 ? 16 : size];
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37 values = new Object[keys.length];
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38 }
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39
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40 public int size() {
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41 return size;
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42 }
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43
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44 public int firstKey() {
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45 if (size == 0) {
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46 throw new NoSuchElementException();
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47 }
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48 return keys[0];
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49 }
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50
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51 public int lastKey() {
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52 if (size == 0) {
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53 throw new NoSuchElementException();
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54 }
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55 return keys[size-1];
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56 }
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57
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58 public void trimToSize() {
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59 if (size < keys.length) {
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60 int[] newKeys = new int[size];
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61 Object[] newValues = new Object[size];
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62 System.arraycopy(keys, 0, newKeys, 0, size);
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63 System.arraycopy(values, 0, newValues, 0, size);
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64 keys = newKeys;
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65 values = newValues;
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66 }
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67 }
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68
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69 public void put(int key, V value) {
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70 int ix = binarySearch(keys, size, key);
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71 if (ix < 0) {
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72 final int insertPoint = -ix - 1;
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73 assert insertPoint <= size; // can't be greater, provided binarySearch didn't malfunction.
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74 if (size == keys.length) {
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75 int capInc = size >>> 2; // +25%
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76 int newCapacity = size + (capInc < 2 ? 2 : capInc) ;
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77 int[] newKeys = new int[newCapacity];
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78 Object[] newValues = new Object[newCapacity];
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79 System.arraycopy(keys, 0, newKeys, 0, insertPoint);
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80 System.arraycopy(keys, insertPoint, newKeys, insertPoint+1, keys.length - insertPoint);
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81 System.arraycopy(values, 0, newValues, 0, insertPoint);
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82 System.arraycopy(values, insertPoint, newValues, insertPoint+1, values.length - insertPoint);
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83 keys = newKeys;
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84 values = newValues;
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85 } else {
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86 // arrays got enough capacity
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87 if (insertPoint != size) {
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88 System.arraycopy(keys, insertPoint, keys, insertPoint+1, keys.length - insertPoint - 1);
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89 System.arraycopy(values, insertPoint, values, insertPoint+1, values.length - insertPoint - 1);
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90 }
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91 // else insertPoint is past known elements, no need to copy arrays
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92 }
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93 keys[insertPoint] = key;
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94 values[insertPoint] = value;
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95 size++;
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96 } else {
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97 values[ix] = value;
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98 }
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99 }
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100
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101 public boolean containsKey(int key) {
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102 return binarySearch(keys, size, key) >= 0;
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103 }
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104
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105 @SuppressWarnings("unchecked")
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106 public V get(int key) {
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107 int ix = binarySearch(keys, size, key);
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108 if (ix >= 0) {
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109 return (V) values[ix];
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110 }
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111 return null;
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112 }
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113
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114 public void remove(int key) {
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115 int ix = binarySearch(keys, size, key);
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116 if (ix >= 0) {
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117 if (ix <= size - 1) {
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118 System.arraycopy(keys, ix+1, keys, ix, size - ix - 1);
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119 System.arraycopy(values, ix+1, values, ix, size - ix - 1);
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120 } // if ix points to last element, no reason to attempt a copy
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121 size--;
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122 keys[size] = 0;
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123 values[size] = null;
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124 }
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125 }
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126
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127 /**
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128 * Forget first N entries (in natural order) in the map.
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129 */
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130 @Experimental
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131 public void removeFromStart(int count) {
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132 if (count > 0 && count <= size) {
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133 if (count < size) {
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134 System.arraycopy(keys, count, keys, 0, size - count);
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135 System.arraycopy(values, count, values, 0, size - count);
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136 }
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137 for (int i = size - count; i < size; i++) {
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138 keys[i] = 0;
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139 values[i] = null;
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140 }
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141 size -= count;
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142 }
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143 }
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144
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145
276
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146
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147 // copy of Arrays.binarySearch, with upper search limit as argument
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148 private static int binarySearch(int[] a, int high, int key) {
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149 int low = 0;
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150 high--;
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151
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152 while (low <= high) {
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153 int mid = (low + high) >> 1;
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154 int midVal = a[mid];
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155
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156 if (midVal < key)
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157 low = mid + 1;
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158 else if (midVal > key)
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159 high = mid - 1;
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160 else
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161 return mid; // key found
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162 }
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163 return -(low + 1); // key not found.
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164 }
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165 }