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annotate src/org/tmatesoft/hg/internal/RevisionSet.java @ 680:58a6900f845d

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Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:15:34 +0200
parents 629a7370554c
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 static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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20
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21 import java.util.ArrayList;
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22 import java.util.Arrays;
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23 import java.util.Collection;
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24 import java.util.Collections;
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25 import java.util.HashSet;
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26 import java.util.Iterator;
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27 import java.util.List;
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28 import java.util.Set;
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29
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30 import org.tmatesoft.hg.core.Nodeid;
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31 import org.tmatesoft.hg.repo.HgChangelog;
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32 import org.tmatesoft.hg.repo.HgParentChildMap;
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33 import org.tmatesoft.hg.repo.HgRepository;
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34
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35 /**
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36 * Unmodifiable collection of revisions with handy set operations
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public final class RevisionSet implements Iterable<Nodeid> {
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42
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43 private final Set<Nodeid> elements;
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44
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45 public RevisionSet(Nodeid... revisions) {
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46 this(revisions == null ? null : Arrays.asList(revisions));
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47 }
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48
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49 public RevisionSet(Collection<Nodeid> revisions) {
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50 this(revisions == null ? new HashSet<Nodeid>() : new HashSet<Nodeid>(revisions));
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51 }
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52
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53 private RevisionSet(HashSet<Nodeid> revisions) {
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54 if (revisions.isEmpty()) {
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55 elements = Collections.<Nodeid>emptySet();
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56 } else {
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57 elements = revisions;
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58 }
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59 }
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60
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61 /**
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62 * elements of the set with no parents or parents not from the same set
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63 */
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64 public RevisionSet roots(HgParentChildMap<HgChangelog> ph) {
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65 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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66 for (Nodeid n : elements) {
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67 assert ph.knownNode(n);
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68 Nodeid p1 = ph.firstParent(n);
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69 if (p1 != null && elements.contains(p1)) {
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70 copy.remove(n);
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71 continue;
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72 }
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73 Nodeid p2 = ph.secondParent(n);
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74 if (p2 != null && elements.contains(p2)) {
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75 copy.remove(n);
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76 continue;
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77 }
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78 }
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79 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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80 }
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81
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82 /**
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83 * Same as {@link #roots(HgParentChildMap)}, but doesn't require a parent-child map
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84 */
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85 public RevisionSet roots(HgRepository repo) {
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86 // TODO introduce parent access interface, use it here, provide implementations
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87 // that delegate to HgParentChildMap or HgRepository
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88 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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89 final HgChangelog clog = repo.getChangelog();
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90 byte[] parent1 = new byte[Nodeid.SIZE], parent2 = new byte[Nodeid.SIZE];
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91 int[] parentRevs = new int[2];
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92 for (Nodeid n : elements) {
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93 assert clog.isKnown(n);
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94 clog.parents(clog.getRevisionIndex(n), parentRevs, parent1, parent2);
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95 if (parentRevs[0] != NO_REVISION && elements.contains(new Nodeid(parent1, false))) {
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96 copy.remove(n);
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97 continue;
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98 }
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99 if (parentRevs[1] != NO_REVISION && elements.contains(new Nodeid(parent2, false))) {
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100 copy.remove(n);
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101 continue;
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102 }
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103 }
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104 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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105 }
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106
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107 /**
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108 * elements of the set that has no children in this set
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109 */
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110 public RevisionSet heads(HgParentChildMap<HgChangelog> ph) {
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111 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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112 // can't do copy.removeAll(ph.childrenOf(asList())); as actual heads are indeed children of some other node
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113 for (Nodeid n : elements) {
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114 assert ph.knownNode(n);
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115 Nodeid p1 = ph.firstParent(n);
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116 Nodeid p2 = ph.secondParent(n);
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117 if (p1 != null && elements.contains(p1)) {
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118 copy.remove(p1);
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119 }
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120 if (p2 != null && elements.contains(p2)) {
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121 copy.remove(p2);
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122 }
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123 }
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124 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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125 }
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126
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127 /**
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128 * Any ancestor of an element from the supplied child set found in this one.
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129 * Elements of the supplied child set are not part of return value.
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130 */
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131 public RevisionSet ancestors(RevisionSet children, HgParentChildMap<HgChangelog> parentHelper) {
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132 if (isEmpty()) {
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133 return this;
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134 }
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135 if (children.isEmpty()) {
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136 return children;
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137 }
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138 RevisionSet chRoots = children.roots(parentHelper);
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139 HashSet<Nodeid> ancestors = new HashSet<Nodeid>();
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140 Set<Nodeid> childrenToCheck = chRoots.elements;
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141 while (!childrenToCheck.isEmpty()) {
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142 HashSet<Nodeid> nextRound = new HashSet<Nodeid>();
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143 for (Nodeid n : childrenToCheck) {
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144 Nodeid p1 = parentHelper.firstParent(n);
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145 Nodeid p2 = parentHelper.secondParent(n);
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146 if (p1 != null && elements.contains(p1)) {
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147 nextRound.add(p1);
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148 }
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149 if (p2 != null && elements.contains(p2)) {
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150 nextRound.add(p2);
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151 }
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152 }
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153 ancestors.addAll(nextRound);
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154 childrenToCheck = nextRound;
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155 }
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156 return new RevisionSet(ancestors);
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157 }
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158
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159 /**
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160 * Revisions that are both direct and indirect children of elements of this revision set
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161 * as known in supplied parent-child map
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162 */
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163 public RevisionSet children(HgParentChildMap<HgChangelog> parentHelper) {
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164 if (isEmpty()) {
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165 return this;
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166 }
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167 List<Nodeid> children = parentHelper.childrenOf(elements);
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168 return new RevisionSet(new HashSet<Nodeid>(children));
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169 }
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170
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171 public RevisionSet intersect(RevisionSet other) {
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172 if (isEmpty()) {
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173 return this;
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174 }
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175 if (other.isEmpty()) {
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176 return other;
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177 }
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178 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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179 copy.retainAll(other.elements);
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180 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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181 }
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182
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183 public RevisionSet subtract(RevisionSet other) {
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184 if (isEmpty() || other.isEmpty()) {
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185 return this;
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186 }
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187 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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188 copy.removeAll(other.elements);
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189 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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190 }
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191
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192 public RevisionSet union(RevisionSet other) {
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193 if (isEmpty()) {
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194 return other;
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195 }
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196 if (other.isEmpty()) {
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197 return this;
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198 }
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199 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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200 copy.addAll(other.elements);
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201 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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202 }
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203
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204 /**
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205 * A ^ B := (A\B).union(B\A)
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206 * A ^ B := A.union(B) \ A.intersect(B)
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207 */
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208 public RevisionSet symmetricDifference(RevisionSet other) {
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209 if (isEmpty()) {
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210 return this;
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211 }
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212 if (other.isEmpty()) {
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213 return other;
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214 }
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215 HashSet<Nodeid> copyA = new HashSet<Nodeid>(elements);
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216 HashSet<Nodeid> copyB = new HashSet<Nodeid>(other.elements);
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217 copyA.removeAll(other.elements);
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218 copyB.removeAll(elements);
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219 copyA.addAll(copyB);
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220 return new RevisionSet(copyA);
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221 }
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222
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223 public boolean isEmpty() {
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224 return elements.isEmpty();
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225 }
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226
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227 public int size() {
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228 return elements.size();
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229 }
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230
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231 public List<Nodeid> asList() {
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232 return new ArrayList<Nodeid>(elements);
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233 }
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234
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235 public Iterator<Nodeid> iterator() {
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236 return elements.iterator();
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237 }
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238
648
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239 @Override
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240 public String toString() {
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241 StringBuilder sb = new StringBuilder();
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242 sb.append('<');
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243 if (!isEmpty()) {
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244 sb.append(elements.size());
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245 sb.append(':');
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246 }
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247 for (Nodeid n : elements) {
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248 sb.append(n.shortNotation());
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249 sb.append(',');
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250 }
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251 if (sb.length() > 1) {
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252 sb.setCharAt(sb.length() - 1, '>');
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253 } else {
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254 sb.append('>');
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255 }
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256 return sb.toString();
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257 }
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258
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259 @Override
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260 public boolean equals(Object obj) {
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261 if (false == obj instanceof RevisionSet) {
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262 return false;
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263 }
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264 return elements.equals(((RevisionSet) obj).elements);
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265 }
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266
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267 @Override
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268 public int hashCode() {
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269 return elements.hashCode();
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270 }
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271 }