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annotate src/org/tmatesoft/hg/internal/RevisionSet.java @ 648:690e71d29bf6

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Introduced RevisionSet to ease update of phase roots on push
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 25 Jun 2013 20:48:37 +0200
parents
children e79cf9a8130b
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648
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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.Collection;
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20 import java.util.Collections;
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21 import java.util.HashSet;
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22 import java.util.Set;
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23
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24 import org.tmatesoft.hg.core.Nodeid;
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25
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26 /**
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27 * Unmodifiable collection of revisions with handy set operations
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public final class RevisionSet {
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33
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34 private final Set<Nodeid> elements;
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35
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36 public RevisionSet(Collection<Nodeid> revisions) {
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37 this(revisions == null ? new HashSet<Nodeid>() : new HashSet<Nodeid>(revisions));
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38 }
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39
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40 private RevisionSet(HashSet<Nodeid> revisions) {
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41 if (revisions.isEmpty()) {
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42 elements = Collections.<Nodeid>emptySet();
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43 } else {
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44 elements = revisions;
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45 }
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46 }
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47
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48 public RevisionSet roots() {
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49 throw Internals.notImplemented();
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50 }
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51
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52 public RevisionSet heads() {
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53 throw Internals.notImplemented();
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54 }
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55
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56 public RevisionSet intersect(RevisionSet other) {
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57 if (isEmpty()) {
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58 return this;
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59 }
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60 if (other.isEmpty()) {
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61 return other;
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62 }
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63 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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64 copy.retainAll(other.elements);
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65 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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66 }
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67
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68 public RevisionSet subtract(RevisionSet other) {
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69 if (isEmpty() || other.isEmpty()) {
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70 return this;
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71 }
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72 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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73 copy.removeAll(other.elements);
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74 return copy.size() == elements.size() ? this : new RevisionSet(copy);
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75 }
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76
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77 public RevisionSet union(RevisionSet other) {
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78 if (isEmpty()) {
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79 return other;
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80 }
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81 if (other.isEmpty()) {
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82 return this;
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83 }
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84 HashSet<Nodeid> copy = new HashSet<Nodeid>(elements);
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85 copy.addAll(other.elements);
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86 return new RevisionSet(copy);
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87 }
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88
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89 /**
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90 * A ^ B := (A\B).union(B\A)
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91 * A ^ B := A.union(B) \ A.intersect(B)
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92 */
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93 public RevisionSet symmetricDifference(RevisionSet other) {
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94 if (isEmpty()) {
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95 return this;
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96 }
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97 if (other.isEmpty()) {
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98 return other;
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99 }
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100 HashSet<Nodeid> copyA = new HashSet<Nodeid>(elements);
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101 HashSet<Nodeid> copyB = new HashSet<Nodeid>(other.elements);
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102 copyA.removeAll(other.elements);
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103 copyB.removeAll(elements);
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104 copyA.addAll(copyB);
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105 return new RevisionSet(copyA);
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106 }
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107
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108 public boolean isEmpty() {
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109 return elements.isEmpty();
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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 sb.append('<');
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116 if (!isEmpty()) {
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117 sb.append(elements.size());
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118 sb.append(':');
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119 }
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120 for (Nodeid n : elements) {
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121 sb.append(n.shortNotation());
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122 sb.append(',');
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123 }
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124 if (sb.length() > 1) {
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125 sb.setCharAt(sb.length() - 1, '>');
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126 } else {
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127 sb.append('>');
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128 }
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129 return sb.toString();
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130 }
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131
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132 @Override
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133 public boolean equals(Object obj) {
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134 if (false == obj instanceof RevisionSet) {
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135 return false;
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136 }
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137 return elements.equals(((RevisionSet) obj).elements);
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138 }
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139
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140 @Override
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141 public int hashCode() {
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142 return elements.hashCode();
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143 }
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144 }