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annotate src/org/tmatesoft/hg/internal/IntMap.java @ 418:528b6780a8bd

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A bit of FIXME cleanup (mostly degraded to TODO post 1.0), comments and javadoc
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Mar 2012 21:02:20 +0100
parents ccd7d25e5aea
children 7bcfbc255f48
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 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class IntMap<V> {
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32
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33 private int[] keys;
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34 private Object[] values;
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35 private int size;
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36
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37 public IntMap(int size) {
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38 keys = new int[size <= 0 ? 16 : size];
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39 values = new Object[keys.length];
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40 }
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41
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42 public int size() {
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43 return size;
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44 }
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45
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46 public int firstKey() {
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47 if (size == 0) {
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48 throw new NoSuchElementException();
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49 }
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50 return keys[0];
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51 }
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52
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53 public int lastKey() {
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54 if (size == 0) {
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55 throw new NoSuchElementException();
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56 }
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57 return keys[size-1];
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58 }
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59
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60 public void trimToSize() {
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61 if (size < keys.length) {
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62 int[] newKeys = new int[size];
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63 Object[] newValues = new Object[size];
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64 System.arraycopy(keys, 0, newKeys, 0, size);
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65 System.arraycopy(values, 0, newValues, 0, size);
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66 keys = newKeys;
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67 values = newValues;
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68 }
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69 }
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70
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71 public void put(int key, V value) {
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72 int ix = binarySearch(keys, size, key);
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73 if (ix < 0) {
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74 final int insertPoint = -ix - 1;
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75 assert insertPoint <= size; // can't be greater, provided binarySearch didn't malfunction.
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76 if (size == keys.length) {
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77 int capInc = size >>> 2; // +25%
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78 int newCapacity = size + (capInc < 2 ? 2 : capInc) ;
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79 int[] newKeys = new int[newCapacity];
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80 Object[] newValues = new Object[newCapacity];
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81 System.arraycopy(keys, 0, newKeys, 0, insertPoint);
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82 System.arraycopy(keys, insertPoint, newKeys, insertPoint+1, keys.length - insertPoint);
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83 System.arraycopy(values, 0, newValues, 0, insertPoint);
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84 System.arraycopy(values, insertPoint, newValues, insertPoint+1, values.length - insertPoint);
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85 keys = newKeys;
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86 values = newValues;
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87 } else {
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88 // arrays got enough capacity
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89 if (insertPoint != size) {
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90 System.arraycopy(keys, insertPoint, keys, insertPoint+1, keys.length - insertPoint - 1);
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91 System.arraycopy(values, insertPoint, values, insertPoint+1, values.length - insertPoint - 1);
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92 }
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93 // else insertPoint is past known elements, no need to copy arrays
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94 }
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95 keys[insertPoint] = key;
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96 values[insertPoint] = value;
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97 size++;
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98 } else {
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99 values[ix] = value;
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100 }
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101 }
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102
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103 public boolean containsKey(int key) {
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104 return binarySearch(keys, size, key) >= 0;
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105 }
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106
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107 @SuppressWarnings("unchecked")
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108 public V get(int key) {
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109 int ix = binarySearch(keys, size, key);
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110 if (ix >= 0) {
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111 return (V) values[ix];
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112 }
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113 return null;
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114 }
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115
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116 public void remove(int key) {
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117 int ix = binarySearch(keys, size, key);
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118 if (ix >= 0) {
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119 if (ix <= size - 1) {
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120 System.arraycopy(keys, ix+1, keys, ix, size - ix - 1);
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121 System.arraycopy(values, ix+1, values, ix, size - ix - 1);
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122 } // if ix points to last element, no reason to attempt a copy
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123 size--;
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124 keys[size] = 0;
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125 values[size] = null;
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126 }
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127 }
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128
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129 /**
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130 * Forget first N entries (in natural order) in the map.
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131 */
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132 @Experimental
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133 public void removeFromStart(int count) {
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134 if (count > 0 && count <= size) {
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135 if (count < size) {
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136 System.arraycopy(keys, count, keys, 0, size - count);
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137 System.arraycopy(values, count, values, 0, size - count);
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138 }
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139 for (int i = size - count; i < size; i++) {
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140 keys[i] = 0;
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141 values[i] = null;
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142 }
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143 size -= count;
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144 }
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145 }
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146
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147 // document iterator is non-modifying (neither remove() nor setValue() works)
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148 // perhaps, may also implement Iterable<Map.Entry> to use nice for()
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149 public Iterator<Map.Entry<Integer, V>> entryIterator() {
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150 class E implements Map.Entry<Integer, V> {
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151 private Integer key;
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152 private V value;
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153
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154 public Integer getKey() {
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155 return key;
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156 }
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157
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158 public V getValue() {
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159 return value;
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160 }
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161
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162 public V setValue(V value) {
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163 throw new UnsupportedOperationException();
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164 }
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165
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166 void init(Integer k, V v) {
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167 key = k;
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168 value = v;
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169 }
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170 }
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171
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172 return new Iterator<Map.Entry<Integer, V>>() {
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173 private int i = 0;
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174 private final E entry = new E();
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175 private final int _size;
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176 private final int[] _keys;
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177 private final Object[] _values;
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178
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179 {
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180 _size = IntMap.this.size;
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181 _keys = IntMap.this.keys;
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182 _values = IntMap.this.values;
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183 }
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184
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185 public boolean hasNext() {
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186 return i < _size;
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187 }
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188
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189 public Entry<Integer, V> next() {
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190 if (i >= _size) {
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191 throw new NoSuchElementException();
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192 }
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193 @SuppressWarnings("unchecked")
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194 V val = (V) _values[i];
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195 entry.init(_keys[i], val);
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196 i++;
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197 return entry;
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198 }
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199
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200 public void remove() {
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201 throw new UnsupportedOperationException();
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202 }
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203 };
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204 }
281
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205
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206 public Map<Integer, ? super V> fill(Map<Integer, ? super V> map) {
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207 for (Iterator<Map.Entry<Integer, V>> it = entryIterator(); it.hasNext(); ) {
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208 Map.Entry<Integer, V> next = it.next();
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209 map.put(next.getKey(), next.getValue());
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210 }
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211 return map;
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212 }
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213
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214 // copy of Arrays.binarySearch, with upper search limit as argument
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215 private static int binarySearch(int[] a, int high, int key) {
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216 int low = 0;
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217 high--;
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218
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219 while (low <= high) {
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220 int mid = (low + high) >> 1;
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221 int midVal = a[mid];
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222
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223 if (midVal < key)
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224 low = mid + 1;
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225 else if (midVal > key)
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226 high = mid - 1;
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227 else
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228 return mid; // key found
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229 }
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230 return -(low + 1); // key not found.
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231 }
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232 }