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

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents f568330dd9c0
children
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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
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21 /**
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22 * Internal alternative to Arrays.sort to build reversed index along with sorting
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23 * and to perform lookup (binary search) without sorted array, using reversed index.
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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 final class ArrayHelper<T extends Comparable<T>> {
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29 private int[] reverse; // aka sorted2natural
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30 private final T[] data;
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31 private T[] sorted;
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32
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33 public ArrayHelper(T[] _data) {
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34 assert _data != null;
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35 data = _data;
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36 }
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37
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38 /**
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39 * Sort data this helper wraps, possibly using supplied array (optional)
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40 * to keep sorted elements
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41 * @param sortDest array to keep sorted values at, or <code>null</code>
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42 * @param sortDestIsEmpty <code>false</code> when sortDest already contains copy of data to be sorted
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43 * @param keepSorted <code>true</code> to save sorted array for future use (e.g. in
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44 */
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45 public void sort(T[] sortDest, boolean sortDestIsEmpty, boolean keepSorted) {
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46 if (sortDest != null) {
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47 assert sortDest.length >= data.length;
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48 if (sortDestIsEmpty) {
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49 System.arraycopy(data, 0, sortDest, 0, data.length);
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50 }
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51 sorted = sortDest;
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52 } else {
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53 sorted = data.clone();
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54 }
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55 reverse = new int[data.length];
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56 for (int i = 0; i < reverse.length; i++) {
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57 // initial reverse indexes, so that elements that do
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58 // not move during sort got correct indexes
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59 reverse[i] = i;
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60 }
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61 sort1(0, data.length);
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62 if (!keepSorted) {
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63 sorted = null;
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64 }
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65 }
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66
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67 /**
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68 * @return all reverse indexes
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69 */
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70 public int[] getReverseIndexes() {
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71 return reverse;
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72 }
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74 public int getReverseIndex(int sortedIndex) {
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75 return reverse[sortedIndex];
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76 }
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78 public T get(int index) {
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79 return data[index];
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80 }
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81
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82 public T[] getData() {
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83 return data;
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84 }
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86 /**
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87 * Look up sorted index of the value, using sort information
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88 * @return same value as {@link Arrays#binarySearch(Object[], Object)} does
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89 */
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90 public int binarySearchSorted(T value) {
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91 if (sorted != null) {
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92 int x = Arrays.binarySearch(sorted, value);
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93 // fulfill the Arrays#binarySearch contract in case sorted array is greater than data
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94 return x >= data.length ? -(data.length - 1) : x;
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95 }
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96 return binarySearchWithReverse(0, data.length, value);
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97 }
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99 /**
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100 * Look up index of the value in the original array.
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101 * @return index in original data, or <code>defaultValue</code> if value not found
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102 */
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103 public int binarySearch(T value, int defaultValue) {
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104 int x = binarySearchSorted(value);
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105 if (x < 0) {
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106 return defaultValue;
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107 }
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108 return reverse[x];
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109 }
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110
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111 /**
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112 * Slightly modified version of Arrays.sort1(int[], int, int) quicksort alg (just to deal with Object[])
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113 */
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114 private void sort1(int off, int len) {
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115 Comparable<Object>[] x = comparableSorted();
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116 // Insertion sort on smallest arrays
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117 if (len < 7) {
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118 for (int i=off; i<len+off; i++)
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119 for (int j=i; j>off && x[j-1].compareTo(x[j]) > 0; j--)
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120 swap(j, j-1);
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121 return;
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122 }
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123
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124 // Choose a partition element, v
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125 int m = off + (len >> 1); // Small arrays, middle element
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126 if (len > 7) {
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127 int l = off;
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128 int n = off + len - 1;
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129 if (len > 40) { // Big arrays, pseudomedian of 9
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130 int s = len/8;
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131 l = med3(l, l+s, l+2*s);
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132 m = med3(m-s, m, m+s);
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133 n = med3(n-2*s, n-s, n);
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134 }
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135 m = med3(l, m, n); // Mid-size, med of 3
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136 }
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137 Comparable<Object> v = x[m];
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138
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139 // Establish Invariant: v* (<v)* (>v)* v*
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140 int a = off, b = a, c = off + len - 1, d = c;
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141 while(true) {
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142 while (b <= c && x[b].compareTo(v) <= 0) {
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143 if (x[b] == v)
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144 swap(a++, b);
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145 b++;
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146 }
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147 while (c >= b && x[c].compareTo(v) >= 0) {
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148 if (x[c] == v)
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149 swap(c, d--);
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150 c--;
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151 }
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152 if (b > c)
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153 break;
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154 swap(b++, c--);
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155 }
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156
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157 // Swap partition elements back to middle
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158 int s, n = off + len;
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159 s = Math.min(a-off, b-a ); vecswap(off, b-s, s);
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160 s = Math.min(d-c, n-d-1); vecswap(b, n-s, s);
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161
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162 // Recursively sort non-partition-elements
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163 if ((s = b-a) > 1)
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164 sort1(off, s);
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165 if ((s = d-c) > 1)
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166 sort1(n-s, s);
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167 }
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168
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169 /**
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170 * Swaps x[a .. (a+n-1)] with x[b .. (b+n-1)].
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171 */
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172 private void vecswap(int a, int b, int n) {
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173 for (int i=0; i<n; i++, a++, b++) {
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174 swap(a, b);
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175 }
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176 }
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177
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178 /**
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179 * Returns the index of the median of the three indexed integers.
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180 */
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181 private int med3(int a, int b, int c) {
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182 Comparable<Object>[] x = comparableSorted();
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183 return (x[a].compareTo(x[b]) < 0 ?
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184 (x[b].compareTo(x[c]) < 0 ? b : x[a].compareTo(x[c]) < 0 ? c : a) :
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185 (x[b].compareTo(x[c]) > 0 ? b : x[a].compareTo(x[c]) > 0 ? c : a));
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186 }
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187
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188 private Comparable<Object>[] comparableSorted() {
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189 // Comparable<Object>[] x = (Comparable<Object>[]) sorted
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190 // eclipse compiler is ok with the line above, while javac doesn't understand it:
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191 // inconvertible types found : T[] required: java.lang.Comparable<java.lang.Object>[]
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192 // so need to add another step
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193 Comparable<?>[] oo = sorted;
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194 @SuppressWarnings("unchecked")
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195 Comparable<Object>[] x = (Comparable<Object>[]) oo;
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196 return x;
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197 }
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198
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199 /**
307
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200 * Swaps x[a] with x[b].
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201 */
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202 private void swap(int a, int b) {
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203 Object[] x = sorted;
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204 Object t = x[a];
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205 x[a] = x[b];
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206 x[b] = t;
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207 int z1 = reverse[a];
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208 int z2 = reverse[b];
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209 reverse[b] = z1;
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210 reverse[a] = z2;
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211 }
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212
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213 // copied from Arrays.binarySearch0, update to be instance method and to use reverse indexes
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214 private int binarySearchWithReverse(int fromIndex, int toIndex, T key) {
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215 int low = fromIndex;
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216 int high = toIndex - 1;
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217
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218 while (low <= high) {
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219 int mid = (low + high) >>> 1;
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220 // data[reverse[x]] gives sorted value at index x
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221 T midVal = data[reverse[mid]];
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222 int cmp = midVal.compareTo(key);
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223
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224 if (cmp < 0)
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225 low = mid + 1;
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226 else if (cmp > 0)
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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
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234 }