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annotate src/org/tmatesoft/hg/internal/RevisionSet.java @ 650:3b275cc2d2aa

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Push: phase4 - settle local and remote phases, push updated phases regardless of server publishing state, do not push secret changesets
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 28 Jun 2013 19:27:26 +0200
parents e79cf9a8130b
children 6e98d34eaca8
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.ArrayList;
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20 import java.util.Collection;
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21 import java.util.Collections;
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22 import java.util.HashSet;
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23 import java.util.Iterator;
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24 import java.util.List;
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25 import java.util.Set;
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26
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.repo.HgChangelog;
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29 import org.tmatesoft.hg.repo.HgParentChildMap;
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30
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31 /**
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32 * Unmodifiable collection of revisions with handy set operations
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public final class RevisionSet implements Iterable<Nodeid> {
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38
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39 private final Set<Nodeid> elements;
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40
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41 public RevisionSet(Collection<Nodeid> revisions) {
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42 this(revisions == null ? new HashSet<Nodeid>() : new HashSet<Nodeid>(revisions));
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43 }
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44
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45 private RevisionSet(HashSet<Nodeid> revisions) {
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46 if (revisions.isEmpty()) {
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47 elements = Collections.<Nodeid>emptySet();
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48 } else {
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49 elements = revisions;
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50 }
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51 }
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52
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53 /**
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54 * elements of the set with no parents or parents not from the same set
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55 */
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56 public RevisionSet roots(HgParentChildMap<HgChangelog> ph) {
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57 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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58 for (Nodeid n : elements) {
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59 assert ph.knownNode(n);
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60 Nodeid p1 = ph.firstParent(n);
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61 if (p1 != null && elements.contains(p1)) {
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62 copy.remove(n);
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63 continue;
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64 }
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65 Nodeid p2 = ph.secondParent(n);
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66 if (p2 != null && elements.contains(p2)) {
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67 copy.remove(n);
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68 continue;
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69 }
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70 }
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71 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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72 }
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73
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74 /**
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75 * elements of the set that has no children in this set
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76 */
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77 public RevisionSet heads(HgParentChildMap<HgChangelog> ph) {
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78 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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79 // can't do copy.removeAll(ph.childrenOf(asList())); as actual heads are indeed children of some other node
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80 for (Nodeid n : elements) {
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81 assert ph.knownNode(n);
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82 Nodeid p1 = ph.firstParent(n);
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83 Nodeid p2 = ph.secondParent(n);
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84 if (p1 != null && elements.contains(p1)) {
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85 copy.remove(p1);
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86 }
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87 if (p2 != null && elements.contains(p2)) {
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88 copy.remove(p2);
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89 }
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90 }
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91 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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92 }
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93
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94 /**
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95 * Any ancestor of an element from the supplied children set found in this one.
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96 */
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97 public RevisionSet ancestors(RevisionSet children, HgParentChildMap<HgChangelog> parentHelper) {
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98 if (isEmpty()) {
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99 return this;
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100 }
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101 if (children.isEmpty()) {
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102 return children;
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103 }
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104 RevisionSet chRoots = children.roots(parentHelper);
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105 HashSet<Nodeid> ancestors = new HashSet<Nodeid>();
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106 Set<Nodeid> childrenToCheck = chRoots.elements;
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107 while (!childrenToCheck.isEmpty()) {
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108 HashSet<Nodeid> nextRound = new HashSet<Nodeid>();
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109 for (Nodeid n : childrenToCheck) {
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110 Nodeid p1 = parentHelper.firstParent(n);
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111 Nodeid p2 = parentHelper.secondParent(n);
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112 if (p1 != null && elements.contains(p1)) {
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113 nextRound.add(p1);
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114 }
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115 if (p2 != null && elements.contains(p2)) {
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116 nextRound.add(p2);
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117 }
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118 }
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119 ancestors.addAll(nextRound);
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120 childrenToCheck = nextRound;
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121 }
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122 return new RevisionSet(ancestors);
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123 }
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124
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125 /**
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126 * Revisions that are both direct and indirect children of elements of this revision set
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127 * as known in supplied parent-child map
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128 */
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129 public RevisionSet children(HgParentChildMap<HgChangelog> parentHelper) {
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130 if (isEmpty()) {
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131 return this;
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132 }
650
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133 List<Nodeid> children = parentHelper.childrenOf(elements);
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134 return new RevisionSet(new HashSet<Nodeid>(children));
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135 }
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136
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137 public RevisionSet intersect(RevisionSet other) {
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138 if (isEmpty()) {
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139 return this;
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140 }
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141 if (other.isEmpty()) {
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142 return other;
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143 }
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144 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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145 copy.retainAll(other.elements);
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146 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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147 }
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148
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149 public RevisionSet subtract(RevisionSet other) {
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150 if (isEmpty() || other.isEmpty()) {
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151 return this;
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152 }
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153 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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154 copy.removeAll(other.elements);
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155 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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156 }
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157
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158 public RevisionSet union(RevisionSet other) {
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159 if (isEmpty()) {
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160 return other;
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161 }
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162 if (other.isEmpty()) {
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163 return this;
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164 }
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165 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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166 copy.addAll(other.elements);
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167 return new RevisionSet(copy);
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168 }
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169
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170 /**
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171 * A ^ B := (A\B).union(B\A)
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172 * A ^ B := A.union(B) \ A.intersect(B)
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173 */
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174 public RevisionSet symmetricDifference(RevisionSet other) {
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175 if (isEmpty()) {
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176 return this;
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177 }
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178 if (other.isEmpty()) {
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179 return other;
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180 }
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181 HashSet<Nodeid> copyA = new HashSet<Nodeid>(elements);
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182 HashSet<Nodeid> copyB = new HashSet<Nodeid>(other.elements);
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183 copyA.removeAll(other.elements);
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184 copyB.removeAll(elements);
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185 copyA.addAll(copyB);
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186 return new RevisionSet(copyA);
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187 }
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188
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189 public boolean isEmpty() {
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190 return elements.isEmpty();
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191 }
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192
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193
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194 public List<Nodeid> asList() {
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195 return new ArrayList<Nodeid>(elements);
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196 }
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197
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198 public Iterator<Nodeid> iterator() {
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199 return elements.iterator();
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200 }
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201
648
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202 @Override
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203 public String toString() {
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204 StringBuilder sb = new StringBuilder();
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205 sb.append('<');
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206 if (!isEmpty()) {
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207 sb.append(elements.size());
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208 sb.append(':');
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209 }
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210 for (Nodeid n : elements) {
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211 sb.append(n.shortNotation());
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212 sb.append(',');
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213 }
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214 if (sb.length() > 1) {
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215 sb.setCharAt(sb.length() - 1, '>');
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216 } else {
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217 sb.append('>');
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218 }
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219 return sb.toString();
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220 }
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221
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222 @Override
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223 public boolean equals(Object obj) {
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224 if (false == obj instanceof RevisionSet) {
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225 return false;
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226 }
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227 return elements.equals(((RevisionSet) obj).elements);
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228 }
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229
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230 @Override
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231 public int hashCode() {
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232 return elements.hashCode();
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233 }
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234 }