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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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 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 }