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annotate src/org/tmatesoft/hg/internal/IntSliceSeq.java @ 681:4f93bbc73b64

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Do not instantiate thousands of small arrays(numerous readInt/readLong calls)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:48:05 +0200
parents 58a6900f845d
children
rev   line source
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1 /*
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2 * Copyright (c) 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.Iterator;
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20 import java.util.NoSuchElementException;
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21
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22 /**
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23 *
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24 * @author Artem Tikhomirov
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25 * @author TMate Software Ltd.
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26 */
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27 public final class IntSliceSeq implements Iterable<IntTuple>, Cloneable {
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28 private final IntVector slices;
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29 private final int slice;
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30
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31 public IntSliceSeq(int sliceSize) {
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32 // initial size/grow values are pure guess
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33 this(sliceSize, 10, 5);
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34 }
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35
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36 public IntSliceSeq(int sliceSize, int initialSlices, int slicesToGrow) {
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37 slices = new IntVector(sliceSize * initialSlices, sliceSize*slicesToGrow);
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38 slice = sliceSize;
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39 }
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40
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41 public IntSliceSeq add(int... values) {
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42 checkValuesAny(values);
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43 slices.add(values);
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44 return this;
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45 }
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46
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47 public IntSliceSeq set(int sliceIndex, int... values) {
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48 checkValuesExact(values);
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49 for (int i = 0, j = sliceIndex*slice; i < slice; i++,j++) {
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50 slices.set(j, values[i]);
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51 }
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52 return this;
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53 }
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54
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55 public IntTuple get(int sliceIndex) {
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56 checkArgRange(size(), sliceIndex);
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57 return new IntTuple(slice).set(slices, sliceIndex*slice);
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58 }
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59
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60 public int get(int sliceIndex, int valueIndex) {
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61 checkArgRange(size(), sliceIndex);
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62 checkArgRange(slice, valueIndex);
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63 return slices.get(sliceIndex*slice + valueIndex);
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64 }
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65
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66 public void addAll(IntSliceSeq other) {
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67 if (other.slice != this.slice) {
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68 throw new IllegalArgumentException(String.format("Tuple size doesn't match: %d and %d", slice, other.slice));
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69 }
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70 slices.addAll(other.slices);
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71 }
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72
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73 public int size() {
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74 return slices.size() / slice;
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75 }
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76
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77 public int sliceSize() {
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78 return slice;
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79 }
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80
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81 public void clear() {
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82 slices.clear();
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83 }
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84
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85 public IntTuple last() {
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86 int lastElementIndex = (size() - 1);
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87 if (lastElementIndex < 0) {
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88 throw new NoSuchElementException();
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89 }
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90 return get(lastElementIndex);
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91 }
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92
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93 public Iterator<IntTuple> iterator() {
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94 return new Iterator<IntTuple>() {
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95 private final IntTuple t = new IntTuple(slice);
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96 private int next = 0;
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97
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98 public boolean hasNext() {
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99 return next < size();
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100 }
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101
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102 public IntTuple next() {
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103 return t.set(slices, next++*slice);
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104 }
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105
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106 public void remove() {
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107 throw new UnsupportedOperationException();
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108 }
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109 };
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110 }
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111
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112 @Override
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113 public String toString() {
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114 StringBuilder sb = new StringBuilder();
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115 for (int i = 0; i < size(); i++) {
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116 sb.append('(');
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117 for (int j = 0; j < slice; j++) {
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118 sb.append(slices.get(i*slice + j));
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119 sb.append(',');
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120 }
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121 sb.setLength(sb.length() - 1);
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122 sb.append(')');
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123 sb.append(' ');
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124 }
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125 return sb.toString();
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126 }
680
58a6900f845d Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
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127
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128 @Override
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129 public IntSliceSeq clone() {
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130 try {
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131 return (IntSliceSeq) super.clone();
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132 } catch (CloneNotSupportedException ex) {
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133 throw new Error(ex);
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134 }
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135 }
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136
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137 private void checkArgRange(int rangeSize, int index) {
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138 if (index >= 0 && index < rangeSize) {
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139 return;
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140 }
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141 throw new IllegalArgumentException(String.valueOf(index));
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142 }
680
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143 private void checkValuesExact(int[] values) {
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144 if (values == null || values.length != slice) {
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145 throw new IllegalArgumentException(String.valueOf(values == null ? values : values.length));
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146 }
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147 }
680
58a6900f845d Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
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148 private void checkValuesAny(int[] values) {
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149 if (values == null || values.length % slice != 0) {
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150 throw new IllegalArgumentException(String.valueOf(values == null ? values : values.length));
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151 }
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152 }
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153 }