1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.conflict;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.util.ArrayList;
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7 | import java.util.Collection;
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8 | import java.util.HashSet;
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9 | import java.util.Iterator;
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10 | import java.util.List;
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11 | import java.util.Objects;
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12 | import java.util.Set;
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13 | import java.util.concurrent.CopyOnWriteArrayList;
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14 |
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15 | import org.openstreetmap.josm.data.osm.Node;
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16 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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17 | import org.openstreetmap.josm.data.osm.Relation;
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18 | import org.openstreetmap.josm.data.osm.Way;
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19 | import org.openstreetmap.josm.tools.CheckParameterUtil;
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20 | import org.openstreetmap.josm.tools.Predicate;
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21 | import org.openstreetmap.josm.tools.Utils;
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22 |
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23 | /**
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24 | * This is a collection of {@link Conflict}s. This collection is {@link Iterable}, i.e.
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25 | * it can be used in <code>for</code>-loops as follows:
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26 | * <pre>
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27 | * ConflictCollection conflictCollection = ....
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28 | *
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29 | * for (Conflict c : conflictCollection) {
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30 | * // do something
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31 | * }
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32 | * </pre>
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33 | *
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34 | * This collection emits an event when the content of the collection changes. You can register
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35 | * and unregister for these events using:
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36 | * <ul>
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37 | * <li>{@link #addConflictListener(IConflictListener)}</li>
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38 | * <li>{@link #removeConflictListener(IConflictListener)}</li>
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39 | * </ul>
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40 | */
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41 | public class ConflictCollection implements Iterable<Conflict<? extends OsmPrimitive>> {
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42 | private final List<Conflict<? extends OsmPrimitive>> conflicts;
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43 | private final CopyOnWriteArrayList<IConflictListener> listeners;
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44 |
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45 | private static class FilterPredicate implements Predicate<Conflict<? extends OsmPrimitive>> {
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46 |
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47 | private final Class<? extends OsmPrimitive> c;
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48 |
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49 | FilterPredicate(Class<? extends OsmPrimitive> c) {
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50 | this.c = c;
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51 | }
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52 |
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53 | @Override
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54 | public boolean evaluate(Conflict<? extends OsmPrimitive> conflict) {
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55 | return conflict != null && c.isInstance(conflict.getMy());
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56 | }
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57 | }
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58 |
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59 | private static final FilterPredicate NODE_FILTER_PREDICATE = new FilterPredicate(Node.class);
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60 | private static final FilterPredicate WAY_FILTER_PREDICATE = new FilterPredicate(Way.class);
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61 | private static final FilterPredicate RELATION_FILTER_PREDICATE = new FilterPredicate(Relation.class);
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62 |
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63 | /**
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64 | * Constructs a new {@code ConflictCollection}.
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65 | */
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66 | public ConflictCollection() {
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67 | conflicts = new ArrayList<>();
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68 | listeners = new CopyOnWriteArrayList<>();
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69 | }
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70 |
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71 | /**
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72 | * Adds the specified conflict listener, if not already present.
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73 | * @param listener The conflict listener to add
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74 | */
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75 | public void addConflictListener(IConflictListener listener) {
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76 | if (listener != null) {
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77 | listeners.addIfAbsent(listener);
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78 | }
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79 | }
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80 |
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81 | /**
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82 | * Removes the specified conflict listener.
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83 | * @param listener The conflict listener to remove
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84 | */
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85 | public void removeConflictListener(IConflictListener listener) {
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86 | listeners.remove(listener);
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87 | }
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88 |
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89 | protected void fireConflictAdded() {
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90 | for (IConflictListener listener : listeners) {
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91 | listener.onConflictsAdded(this);
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92 | }
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93 | }
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94 |
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95 | protected void fireConflictRemoved() {
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96 | for (IConflictListener listener : listeners) {
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97 | listener.onConflictsRemoved(this);
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98 | }
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99 | }
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100 |
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101 | /**
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102 | * Adds a conflict to the collection
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103 | *
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104 | * @param conflict the conflict
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105 | * @throws IllegalStateException if this collection already includes a conflict for conflict.getMy()
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106 | */
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107 | protected void addConflict(Conflict<?> conflict) {
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108 | if (hasConflictForMy(conflict.getMy()))
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109 | throw new IllegalStateException(tr("Already registered a conflict for primitive ''{0}''.", conflict.getMy().toString()));
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110 | if (!conflicts.contains(conflict)) {
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111 | conflicts.add(conflict);
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112 | }
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113 | }
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114 |
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115 | /**
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116 | * Adds a conflict to the collection of conflicts.
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117 | *
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118 | * @param conflict the conflict to add. Must not be null.
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119 | * @throws IllegalArgumentException if conflict is null
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120 | * @throws IllegalStateException if this collection already includes a conflict for conflict.getMy()
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121 | */
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122 | public void add(Conflict<?> conflict) {
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123 | CheckParameterUtil.ensureParameterNotNull(conflict, "conflict");
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124 | addConflict(conflict);
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125 | fireConflictAdded();
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126 | }
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127 |
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128 | /**
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129 | * Add the conflicts in <code>otherConflicts</code> to this collection of conflicts
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130 | *
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131 | * @param otherConflicts the collection of conflicts. Does nothing is conflicts is null.
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132 | */
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133 | public void add(Collection<Conflict<?>> otherConflicts) {
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134 | if (otherConflicts == null) return;
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135 | for (Conflict<?> c : otherConflicts) {
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136 | addConflict(c);
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137 | }
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138 | fireConflictAdded();
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139 | }
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140 |
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141 | /**
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142 | * Adds a conflict for the pair of {@link OsmPrimitive}s given by <code>my</code> and
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143 | * <code>their</code>.
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144 | *
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145 | * @param my my primitive
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146 | * @param their their primitive
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147 | */
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148 | public void add(OsmPrimitive my, OsmPrimitive their) {
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149 | addConflict(new Conflict<>(my, their));
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150 | fireConflictAdded();
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151 | }
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152 |
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153 | /**
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154 | * removes a conflict from this collection
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155 | *
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156 | * @param conflict the conflict
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157 | */
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158 | public void remove(Conflict<?> conflict) {
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159 | conflicts.remove(conflict);
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160 | fireConflictRemoved();
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161 | }
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162 |
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163 | /**
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164 | * removes the conflict registered for {@link OsmPrimitive} <code>my</code> if any
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165 | *
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166 | * @param my the primitive
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167 | */
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168 | public void remove(OsmPrimitive my) {
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169 | Iterator<Conflict<?>> it = iterator();
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170 | while (it.hasNext()) {
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171 | if (it.next().isMatchingMy(my)) {
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172 | it.remove();
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173 | }
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174 | }
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175 | fireConflictRemoved();
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176 | }
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177 |
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178 | /**
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179 | * Replies the conflict for the {@link OsmPrimitive} <code>my</code>, null
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180 | * if no such conflict exists.
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181 | *
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182 | * @param my my primitive
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183 | * @return the conflict for the {@link OsmPrimitive} <code>my</code>, null
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184 | * if no such conflict exists.
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185 | */
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186 | public Conflict<?> getConflictForMy(OsmPrimitive my) {
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187 | for (Conflict<?> c : conflicts) {
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188 | if (c.isMatchingMy(my))
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189 | return c;
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190 | }
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191 | return null;
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192 | }
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193 |
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194 | /**
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195 | * Replies the conflict for the {@link OsmPrimitive} <code>their</code>, null
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196 | * if no such conflict exists.
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197 | *
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198 | * @param their their primitive
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199 | * @return the conflict for the {@link OsmPrimitive} <code>their</code>, null
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200 | * if no such conflict exists.
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201 | */
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202 | public Conflict<?> getConflictForTheir(OsmPrimitive their) {
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203 | for (Conflict<?> c : conflicts) {
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204 | if (c.isMatchingTheir(their))
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205 | return c;
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206 | }
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207 | return null;
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208 | }
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209 |
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210 | /**
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211 | * Replies true, if this collection includes a conflict for <code>my</code>.
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212 | *
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213 | * @param my my primitive
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214 | * @return true, if this collection includes a conflict for <code>my</code>; false, otherwise
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215 | */
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216 | public boolean hasConflictForMy(OsmPrimitive my) {
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217 | return getConflictForMy(my) != null;
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218 | }
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219 |
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220 | /**
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221 | * Replies true, if this collection includes a given conflict
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222 | *
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223 | * @param c the conflict
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224 | * @return true, if this collection includes the conflict; false, otherwise
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225 | */
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226 | public boolean hasConflict(Conflict<?> c) {
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227 | return hasConflictForMy(c.getMy());
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228 | }
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229 |
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230 | /**
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231 | * Replies true, if this collection includes a conflict for <code>their</code>.
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232 | *
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233 | * @param their their primitive
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234 | * @return true, if this collection includes a conflict for <code>their</code>; false, otherwise
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235 | */
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236 | public boolean hasConflictForTheir(OsmPrimitive their) {
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237 | return getConflictForTheir(their) != null;
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238 | }
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239 |
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240 | /**
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241 | * Removes any conflicts for the {@link OsmPrimitive} <code>my</code>.
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242 | *
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243 | * @param my the primitive
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244 | */
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245 | public void removeForMy(OsmPrimitive my) {
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246 | Iterator<Conflict<?>> it = iterator();
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247 | while (it.hasNext()) {
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248 | if (it.next().isMatchingMy(my)) {
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249 | it.remove();
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250 | }
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251 | }
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252 | }
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253 |
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254 | /**
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255 | * Removes any conflicts for the {@link OsmPrimitive} <code>their</code>.
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256 | *
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257 | * @param their the primitive
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258 | */
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259 | public void removeForTheir(OsmPrimitive their) {
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260 | Iterator<Conflict<?>> it = iterator();
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261 | while (it.hasNext()) {
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262 | if (it.next().isMatchingTheir(their)) {
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263 | it.remove();
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264 | }
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265 | }
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266 | }
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267 |
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268 | /**
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269 | * Replies the conflicts as list.
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270 | *
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271 | * @return the list of conflicts
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272 | */
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273 | public List<Conflict<?>> get() {
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274 | return conflicts;
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275 | }
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276 |
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277 | /**
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278 | * Replies the size of the collection
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279 | *
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280 | * @return the size of the collection
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281 | */
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282 | public int size() {
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283 | return conflicts.size();
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284 | }
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285 |
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286 | /**
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287 | * Replies the conflict at position <code>idx</code>
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288 | *
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289 | * @param idx the index
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290 | * @return the conflict at position <code>idx</code>
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291 | */
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292 | public Conflict<?> get(int idx) {
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293 | return conflicts.get(idx);
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294 | }
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295 |
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296 | /**
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297 | * Replies the iterator for this collection.
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298 | *
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299 | * @return the iterator
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300 | */
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301 | @Override
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302 | public Iterator<Conflict<?>> iterator() {
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303 | return conflicts.iterator();
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304 | }
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305 |
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306 | /**
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307 | * Adds all conflicts from another collection.
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308 | * @param other The other collection of conflicts to add
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309 | */
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310 | public void add(ConflictCollection other) {
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311 | for (Conflict<?> c : other) {
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312 | add(c);
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313 | }
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314 | }
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315 |
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316 | /**
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317 | * Replies the set of {@link OsmPrimitive} which participate in the role
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318 | * of "my" in the conflicts managed by this collection.
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319 | *
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320 | * @return the set of {@link OsmPrimitive} which participate in the role
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321 | * of "my" in the conflicts managed by this collection.
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322 | */
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323 | public Set<OsmPrimitive> getMyConflictParties() {
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324 | Set<OsmPrimitive> ret = new HashSet<>();
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325 | for (Conflict<?> c: conflicts) {
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326 | ret.add(c.getMy());
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327 | }
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328 | return ret;
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329 | }
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330 |
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331 | /**
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332 | * Replies the set of {@link OsmPrimitive} which participate in the role
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333 | * of "their" in the conflicts managed by this collection.
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334 | *
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335 | * @return the set of {@link OsmPrimitive} which participate in the role
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336 | * of "their" in the conflicts managed by this collection.
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337 | */
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338 | public Set<OsmPrimitive> getTheirConflictParties() {
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339 | Set<OsmPrimitive> ret = new HashSet<>();
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340 | for (Conflict<?> c: conflicts) {
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341 | ret.add(c.getTheir());
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342 | }
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343 | return ret;
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344 | }
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345 |
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346 | /**
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347 | * Replies true if this collection is empty
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348 | *
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349 | * @return true, if this collection is empty; false, otherwise
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350 | */
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351 | public boolean isEmpty() {
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352 | return size() == 0;
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353 | }
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354 |
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355 | @Override
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356 | public String toString() {
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357 | return conflicts.toString();
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358 | }
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359 |
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360 | /**
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361 | * Returns the list of conflicts involving nodes.
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362 | * @return The list of conflicts involving nodes.
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363 | * @since 6555
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364 | */
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365 | public final Collection<Conflict<? extends OsmPrimitive>> getNodeConflicts() {
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366 | return Utils.filter(conflicts, NODE_FILTER_PREDICATE);
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367 | }
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368 |
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369 | /**
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370 | * Returns the list of conflicts involving nodes.
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371 | * @return The list of conflicts involving nodes.
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372 | * @since 6555
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373 | */
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374 | public final Collection<Conflict<? extends OsmPrimitive>> getWayConflicts() {
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375 | return Utils.filter(conflicts, WAY_FILTER_PREDICATE);
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376 | }
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377 |
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378 | /**
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379 | * Returns the list of conflicts involving nodes.
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380 | * @return The list of conflicts involving nodes.
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381 | * @since 6555
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382 | */
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383 | public final Collection<Conflict<? extends OsmPrimitive>> getRelationConflicts() {
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384 | return Utils.filter(conflicts, RELATION_FILTER_PREDICATE);
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385 | }
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386 |
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387 | @Override
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388 | public int hashCode() {
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389 | return Objects.hash(conflicts, listeners);
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390 | }
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391 |
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392 | @Override
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393 | public boolean equals(Object obj) {
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394 | if (this == obj) return true;
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395 | if (obj == null || getClass() != obj.getClass()) return false;
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396 | ConflictCollection conflicts1 = (ConflictCollection) obj;
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397 | return Objects.equals(conflicts, conflicts1.conflicts) &&
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398 | Objects.equals(listeners, conflicts1.listeners);
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399 | }
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400 | }
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