Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/IntMap.java @ 276:6355ecda1f08
Tailored Map implementation with int keys
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Mon, 29 Aug 2011 22:15:12 +0200 |
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children | 55fad5e0e98b |
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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 * |
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25 * @author Artem Tikhomirov |
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26 * @author TMate Software Ltd. |
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27 */ |
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28 public class IntMap<V> { |
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29 |
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30 private int[] keys; |
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31 private Object[] values; |
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32 private int size; |
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33 |
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34 public IntMap(int size) { |
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35 keys = new int[size <= 0 ? 16 : size]; |
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36 values = new Object[keys.length]; |
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37 } |
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38 |
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39 public int size() { |
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40 return size; |
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41 } |
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42 |
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43 public int firstKey() { |
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44 if (size == 0) { |
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45 throw new NoSuchElementException(); |
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46 } |
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47 return keys[0]; |
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48 } |
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49 |
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50 public int lastKey() { |
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51 if (size == 0) { |
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52 throw new NoSuchElementException(); |
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53 } |
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54 return keys[size-1]; |
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55 } |
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56 |
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57 public void trimToSize() { |
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58 if (size < keys.length) { |
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59 int[] newKeys = new int[size]; |
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60 Object[] newValues = new Object[size]; |
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61 System.arraycopy(keys, 0, newKeys, 0, size); |
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62 System.arraycopy(values, 0, newValues, 0, size); |
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63 keys = newKeys; |
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64 values = newValues; |
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65 } |
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66 } |
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67 |
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68 public void put(int key, V value) { |
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69 int ix = binarySearch(keys, size, key); |
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70 if (ix < 0) { |
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71 final int insertPoint = -ix - 1; |
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72 assert insertPoint <= size; // can't be greater, provided binarySearch didn't malfunction. |
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73 if (size == keys.length) { |
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74 int newCapacity = size + (size >>> 2); |
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75 int[] newKeys = new int[newCapacity]; |
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76 Object[] newValues = new Object[newCapacity]; |
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77 System.arraycopy(keys, 0, newKeys, 0, insertPoint); |
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78 System.arraycopy(keys, insertPoint, newKeys, insertPoint+1, keys.length - insertPoint); |
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79 System.arraycopy(values, 0, newValues, 0, insertPoint); |
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80 System.arraycopy(values, insertPoint, newValues, insertPoint+1, values.length - insertPoint); |
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81 keys = newKeys; |
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82 values = newValues; |
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83 } else { |
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84 // arrays got enough capacity |
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85 if (insertPoint != size) { |
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86 System.arraycopy(keys, insertPoint, keys, insertPoint+1, keys.length - insertPoint - 1); |
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87 System.arraycopy(values, insertPoint, values, insertPoint+1, values.length - insertPoint - 1); |
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88 } |
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89 // else insertPoint is past known elements, no need to copy arrays |
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90 } |
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91 keys[insertPoint] = key; |
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92 values[insertPoint] = value; |
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93 size++; |
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94 } else { |
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95 values[ix] = value; |
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96 } |
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97 } |
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98 |
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99 public boolean containsKey(int key) { |
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100 return binarySearch(keys, size, key) >= 0; |
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101 } |
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102 |
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103 @SuppressWarnings("unchecked") |
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104 public V get(int key) { |
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105 int ix = binarySearch(keys, size, key); |
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106 if (ix >= 0) { |
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107 return (V) values[ix]; |
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108 } |
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109 return null; |
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110 } |
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111 |
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112 // copy of Arrays.binarySearch, with upper search limit as argument |
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113 private static int binarySearch(int[] a, int high, int key) { |
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114 int low = 0; |
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115 high--; |
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116 |
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117 while (low <= high) { |
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118 int mid = (low + high) >> 1; |
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119 int midVal = a[mid]; |
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120 |
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121 if (midVal < key) |
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122 low = mid + 1; |
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123 else if (midVal > key) |
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124 high = mid - 1; |
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125 else |
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126 return mid; // key found |
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127 } |
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128 return -(low + 1); // key not found. |
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129 } |
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130 |
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131 public static void main(String[] args) { |
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132 IntMap<String> m = new IntMap<String>(-1); |
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133 m.put(18, "18"); |
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134 m.put(1, "1"); |
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135 m.put(9, "9"); |
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136 m.put(20, "20"); |
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137 m.put(2, "2"); |
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138 m.put(3, "3"); |
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139 m.put(21, "21"); |
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140 m.put(15, "15"); |
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141 m.put(12, "12"); |
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142 m.put(11, "11"); |
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143 m.put(31, "31"); |
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144 System.out.printf("%d [%d..%d]\n", m.size(), m.firstKey(), m.lastKey()); |
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145 for (int i = m.firstKey(); i <= m.lastKey(); i++) { |
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146 if (m.containsKey(i)) { |
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147 System.out.printf("@%02d:%s\n", i, m.get(i)); |
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148 } |
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149 } |
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150 } |
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151 } |