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annotate src/org/tmatesoft/hg/internal/IntMap.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents d2552e6a5af6
children
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 import java.util.Collection;
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21 import java.util.Iterator;
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22 import java.util.Map;
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23 import java.util.Map.Entry;
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24 import java.util.NoSuchElementException;
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25
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26
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27 /**
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28 * Map implementation that uses plain int keys and performs with log n effectiveness.
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29 * May contain null values
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public class IntMap<V> {
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35
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36 private int[] keys;
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37 private Object[] values;
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38 private int size;
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39
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40 public IntMap(int size) {
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41 keys = new int[size <= 0 ? 16 : size];
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42 values = new Object[keys.length];
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43 }
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44
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45 public int size() {
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46 return size;
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47 }
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48
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49 public int firstKey() {
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50 if (size == 0) {
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51 throw new NoSuchElementException();
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52 }
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53 return keys[0];
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54 }
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55
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56 public int lastKey() {
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57 if (size == 0) {
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58 throw new NoSuchElementException();
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59 }
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60 return keys[size-1];
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61 }
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62
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63 public void trimToSize() {
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64 if (size < keys.length) {
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65 int[] newKeys = new int[size];
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66 Object[] newValues = new Object[size];
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67 System.arraycopy(keys, 0, newKeys, 0, size);
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68 System.arraycopy(values, 0, newValues, 0, size);
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69 keys = newKeys;
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70 values = newValues;
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71 }
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72 }
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73
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74 public void put(int key, V value) {
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75 int ix = binarySearch(keys, size, key);
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76 if (ix < 0) {
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77 final int insertPoint = -ix - 1;
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78 assert insertPoint <= size; // can't be greater, provided binarySearch didn't malfunction.
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79 if (size == keys.length) {
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80 int capInc = size >>> 2; // +25%
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81 int newCapacity = size + (capInc < 2 ? 2 : capInc) ;
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82 int[] newKeys = new int[newCapacity];
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83 Object[] newValues = new Object[newCapacity];
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84 System.arraycopy(keys, 0, newKeys, 0, insertPoint);
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85 System.arraycopy(keys, insertPoint, newKeys, insertPoint+1, keys.length - insertPoint);
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86 System.arraycopy(values, 0, newValues, 0, insertPoint);
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87 System.arraycopy(values, insertPoint, newValues, insertPoint+1, values.length - insertPoint);
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88 keys = newKeys;
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89 values = newValues;
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90 } else {
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91 // arrays got enough capacity
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92 if (insertPoint != size) {
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93 System.arraycopy(keys, insertPoint, keys, insertPoint+1, keys.length - insertPoint - 1);
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94 System.arraycopy(values, insertPoint, values, insertPoint+1, values.length - insertPoint - 1);
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95 }
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96 // else insertPoint is past known elements, no need to copy arrays
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97 }
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98 keys[insertPoint] = key;
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99 values[insertPoint] = value;
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100 size++;
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101 } else {
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102 values[ix] = value;
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103 }
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104 }
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105
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106 public boolean containsKey(int key) {
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107 return binarySearch(keys, size, key) >= 0;
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108 }
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109
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110 @SuppressWarnings("unchecked")
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111 public V get(int key) {
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112 int ix = binarySearch(keys, size, key);
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113 if (ix >= 0) {
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114 return (V) values[ix];
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115 }
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116 return null;
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117 }
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118
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119 public void remove(int key) {
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120 int ix = binarySearch(keys, size, key);
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121 if (ix >= 0) {
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122 if (ix <= size - 1) {
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123 System.arraycopy(keys, ix+1, keys, ix, size - ix - 1);
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124 System.arraycopy(values, ix+1, values, ix, size - ix - 1);
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125 } // if ix points to last element, no reason to attempt a copy
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126 size--;
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127 keys[size] = 0;
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128 values[size] = null;
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129 }
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130 }
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131
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132 public void clear() {
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133 Arrays.fill(values, 0, size, null); // do not keep the references
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134 size = 0;
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135 }
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136
281
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137 /**
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138 * Forget first N entries (in natural order) in the map.
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139 */
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140 public void removeFromStart(int count) {
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141 if (count > 0 && count <= size) {
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142 if (count < size) {
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143 System.arraycopy(keys, count, keys, 0, size - count);
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144 System.arraycopy(values, count, values, 0, size - count);
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145 }
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146 for (int i = size - count; i < size; i++) {
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147 keys[i] = 0;
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148 values[i] = null;
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149 }
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150 size -= count;
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151 }
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152 }
415
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153
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154 // document iterator is non-modifying (neither remove() nor setValue() works)
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155 // perhaps, may also implement Iterable<Map.Entry> to use nice for()
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156 public Iterator<Map.Entry<Integer, V>> entryIterator() {
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157 class E implements Map.Entry<Integer, V> {
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158 private Integer key;
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159 private V value;
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160
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161 public Integer getKey() {
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162 return key;
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163 }
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164
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165 public V getValue() {
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166 return value;
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167 }
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168
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169 public V setValue(V value) {
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170 throw new UnsupportedOperationException();
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171 }
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172
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173 void init(Integer k, V v) {
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174 key = k;
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175 value = v;
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176 }
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177 }
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178
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179 return new Iterator<Map.Entry<Integer, V>>() {
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180 private int i = 0;
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181 private final E entry = new E();
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182 private final int _size;
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183 private final int[] _keys;
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184 private final Object[] _values;
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185
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186 {
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187 _size = IntMap.this.size;
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188 _keys = IntMap.this.keys;
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189 _values = IntMap.this.values;
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190 }
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191
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192 public boolean hasNext() {
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193 return i < _size;
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194 }
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195
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196 public Entry<Integer, V> next() {
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197 if (i >= _size) {
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198 throw new NoSuchElementException();
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199 }
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200 @SuppressWarnings("unchecked")
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201 V val = (V) _values[i];
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202 entry.init(_keys[i], val);
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203 i++;
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204 return entry;
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205 }
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206
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207 public void remove() {
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208 throw new UnsupportedOperationException();
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209 }
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210 };
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211 }
281
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212
415
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213 public Map<Integer, ? super V> fill(Map<Integer, ? super V> map) {
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214 for (Iterator<Map.Entry<Integer, V>> it = entryIterator(); it.hasNext(); ) {
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215 Map.Entry<Integer, V> next = it.next();
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216 map.put(next.getKey(), next.getValue());
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217 }
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218 return map;
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219 }
656
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220
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221 public int[] keys() {
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222 int[] rv = new int[size];
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223 System.arraycopy(keys, 0, rv, 0, size);
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224 return rv;
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225 }
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226
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227 public Collection<V> values() {
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228 @SuppressWarnings("unchecked")
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229 V[] rv = (V[]) new Object[size];
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230 System.arraycopy(values, 0, rv, 0, size);
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231 return Arrays.<V>asList(rv);
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232 }
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233
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234 // copy of Arrays.binarySearch, with upper search limit as argument
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235 private static int binarySearch(int[] a, int high, int key) {
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236 int low = 0;
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237 high--;
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238
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239 while (low <= high) {
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240 int mid = (low + high) >> 1;
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241 int midVal = a[mid];
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242
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243 if (midVal < key)
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244 low = mid + 1;
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245 else if (midVal > key)
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246 high = mid - 1;
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247 else
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248 return mid; // key found
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249 }
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250 return -(low + 1); // key not found.
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251 }
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252 }