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annotate src/org/tmatesoft/hg/internal/IntMap.java @ 525:0be5be8d57e9

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 11 Jan 2013 18:12:39 +0100
parents 7bcfbc255f48
children 4ea0351ca878
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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.Iterator;
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20 import java.util.Map;
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21 import java.util.Map.Entry;
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22 import java.util.NoSuchElementException;
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23
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24
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25 /**
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26 * Map implementation that uses plain int keys and performs with log n effectiveness.
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27 * May contain null values
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public class IntMap<V> {
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33
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34 private int[] keys;
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35 private Object[] values;
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36 private int size;
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37
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38 public IntMap(int size) {
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39 keys = new int[size <= 0 ? 16 : size];
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40 values = new Object[keys.length];
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41 }
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42
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43 public int size() {
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44 return size;
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45 }
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46
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47 public int firstKey() {
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48 if (size == 0) {
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49 throw new NoSuchElementException();
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50 }
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51 return keys[0];
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52 }
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53
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54 public int lastKey() {
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55 if (size == 0) {
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56 throw new NoSuchElementException();
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57 }
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58 return keys[size-1];
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59 }
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60
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61 public void trimToSize() {
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62 if (size < keys.length) {
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63 int[] newKeys = new int[size];
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64 Object[] newValues = new Object[size];
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65 System.arraycopy(keys, 0, newKeys, 0, size);
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66 System.arraycopy(values, 0, newValues, 0, size);
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67 keys = newKeys;
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68 values = newValues;
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69 }
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70 }
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71
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72 public void put(int key, V value) {
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73 int ix = binarySearch(keys, size, key);
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74 if (ix < 0) {
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75 final int insertPoint = -ix - 1;
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76 assert insertPoint <= size; // can't be greater, provided binarySearch didn't malfunction.
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77 if (size == keys.length) {
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78 int capInc = size >>> 2; // +25%
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79 int newCapacity = size + (capInc < 2 ? 2 : capInc) ;
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80 int[] newKeys = new int[newCapacity];
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81 Object[] newValues = new Object[newCapacity];
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82 System.arraycopy(keys, 0, newKeys, 0, insertPoint);
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83 System.arraycopy(keys, insertPoint, newKeys, insertPoint+1, keys.length - insertPoint);
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84 System.arraycopy(values, 0, newValues, 0, insertPoint);
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85 System.arraycopy(values, insertPoint, newValues, insertPoint+1, values.length - insertPoint);
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86 keys = newKeys;
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87 values = newValues;
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88 } else {
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89 // arrays got enough capacity
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90 if (insertPoint != size) {
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91 System.arraycopy(keys, insertPoint, keys, insertPoint+1, keys.length - insertPoint - 1);
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92 System.arraycopy(values, insertPoint, values, insertPoint+1, values.length - insertPoint - 1);
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93 }
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94 // else insertPoint is past known elements, no need to copy arrays
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95 }
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96 keys[insertPoint] = key;
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97 values[insertPoint] = value;
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98 size++;
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99 } else {
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100 values[ix] = value;
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101 }
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102 }
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103
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104 public boolean containsKey(int key) {
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105 return binarySearch(keys, size, key) >= 0;
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106 }
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107
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108 @SuppressWarnings("unchecked")
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109 public V get(int key) {
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110 int ix = binarySearch(keys, size, key);
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111 if (ix >= 0) {
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112 return (V) values[ix];
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113 }
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114 return null;
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115 }
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116
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117 public void remove(int key) {
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118 int ix = binarySearch(keys, size, key);
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119 if (ix >= 0) {
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120 if (ix <= size - 1) {
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121 System.arraycopy(keys, ix+1, keys, ix, size - ix - 1);
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122 System.arraycopy(values, ix+1, values, ix, size - ix - 1);
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123 } // if ix points to last element, no reason to attempt a copy
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124 size--;
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125 keys[size] = 0;
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126 values[size] = null;
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127 }
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128 }
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129
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130 /**
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131 * Forget first N entries (in natural order) in the map.
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132 */
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133 @Experimental
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134 public void removeFromStart(int count) {
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135 if (count > 0 && count <= size) {
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136 if (count < size) {
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137 System.arraycopy(keys, count, keys, 0, size - count);
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138 System.arraycopy(values, count, values, 0, size - count);
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139 }
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140 for (int i = size - count; i < size; i++) {
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141 keys[i] = 0;
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142 values[i] = null;
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143 }
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144 size -= count;
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145 }
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146 }
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147
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148 // document iterator is non-modifying (neither remove() nor setValue() works)
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149 // perhaps, may also implement Iterable<Map.Entry> to use nice for()
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150 public Iterator<Map.Entry<Integer, V>> entryIterator() {
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151 class E implements Map.Entry<Integer, V> {
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152 private Integer key;
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153 private V value;
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154
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155 public Integer getKey() {
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156 return key;
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157 }
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158
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159 public V getValue() {
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160 return value;
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161 }
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162
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163 public V setValue(V value) {
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164 throw new UnsupportedOperationException();
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165 }
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166
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167 void init(Integer k, V v) {
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168 key = k;
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169 value = v;
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170 }
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171 }
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172
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173 return new Iterator<Map.Entry<Integer, V>>() {
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174 private int i = 0;
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175 private final E entry = new E();
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176 private final int _size;
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177 private final int[] _keys;
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178 private final Object[] _values;
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179
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180 {
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181 _size = IntMap.this.size;
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182 _keys = IntMap.this.keys;
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183 _values = IntMap.this.values;
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184 }
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185
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186 public boolean hasNext() {
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187 return i < _size;
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188 }
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189
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190 public Entry<Integer, V> next() {
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191 if (i >= _size) {
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192 throw new NoSuchElementException();
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193 }
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194 @SuppressWarnings("unchecked")
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195 V val = (V) _values[i];
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196 entry.init(_keys[i], val);
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197 i++;
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198 return entry;
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199 }
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200
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201 public void remove() {
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202 throw new UnsupportedOperationException();
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203 }
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204 };
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205 }
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206
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207 public Map<Integer, ? super V> fill(Map<Integer, ? super V> map) {
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208 for (Iterator<Map.Entry<Integer, V>> it = entryIterator(); it.hasNext(); ) {
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209 Map.Entry<Integer, V> next = it.next();
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210 map.put(next.getKey(), next.getValue());
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211 }
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212 return map;
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213 }
276
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214
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215 // copy of Arrays.binarySearch, with upper search limit as argument
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216 private static int binarySearch(int[] a, int high, int key) {
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217 int low = 0;
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218 high--;
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219
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220 while (low <= high) {
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221 int mid = (low + high) >> 1;
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222 int midVal = a[mid];
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223
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224 if (midVal < key)
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225 low = mid + 1;
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226 else if (midVal > key)
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227 high = mid - 1;
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228 else
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229 return mid; // key found
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230 }
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231 return -(low + 1); // key not found.
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232 }
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233 }