1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.osm;
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3 |
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4 | import java.util.Collections;
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5 | import java.util.HashSet;
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6 | import java.util.LinkedHashSet;
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7 | import java.util.Set;
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8 | import java.util.stream.Collectors;
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9 | import java.util.stream.Stream;
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10 |
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11 | import org.openstreetmap.josm.tools.CheckParameterUtil;
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12 |
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13 | /**
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14 | * This is a listener that listens to selection change events in the data set.
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15 | * @author Michael Zangl
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16 | * @since 12048
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17 | */
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18 | @FunctionalInterface
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19 | public interface DataSelectionListener {
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20 |
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21 | /**
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22 | * Called whenever the selection is changed.
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23 | * @param e The selection change event.
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24 | */
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25 | void selectionChanged(SelectionChangeEvent e);
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26 |
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27 | /**
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28 | * The event that is fired when the selection changed.
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29 | * @author Michael Zangl
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30 | * @since 12048
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31 | */
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32 | interface SelectionChangeEvent {
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33 | /**
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34 | * Gets the previous selection
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35 | * <p>
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36 | * This collection cannot be modified and will not change.
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37 | * @return The old selection
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38 | */
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39 | Set<OsmPrimitive> getOldSelection();
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40 |
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41 | /**
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42 | * Gets the new selection. New elements are added to the end of the collection.
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43 | * <p>
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44 | * This collection cannot be modified and will not change.
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45 | * @return The new selection
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46 | */
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47 | Set<OsmPrimitive> getSelection();
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48 |
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49 | /**
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50 | * Gets the primitives that have been removed from the selection.
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51 | * <p>
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52 | * Those are the primitives contained in {@link #getOldSelection()} but not in {@link #getSelection()}
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53 | * <p>
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54 | * This collection cannot be modified and will not change.
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55 | * @return The primitives
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56 | */
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57 | Set<OsmPrimitive> getRemoved();
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58 |
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59 | /**
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60 | * Gets the primitives that have been added to the selection.
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61 | * <p>
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62 | * Those are the primitives contained in {@link #getSelection()} but not in {@link #getOldSelection()}
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63 | * <p>
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64 | * This collection cannot be modified and will not change.
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65 | * @return The primitives
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66 | */
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67 | Set<OsmPrimitive> getAdded();
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68 |
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69 | /**
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70 | * Gets the data set that triggered this selection event.
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71 | * @return The data set.
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72 | */
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73 | DataSet getSource();
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74 |
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75 | /**
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76 | * Test if this event did not change anything.
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77 | * <p>
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78 | * Should return true for all events that are fired.
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79 | * @return <code>true</code> if this did not change the selection.
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80 | */
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81 | default boolean isNop() {
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82 | return getAdded().isEmpty() && getRemoved().isEmpty();
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83 | }
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84 | }
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85 |
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86 | /**
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87 | * The base class for selection events
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88 | * @author Michael Zangl
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89 | * @since 12048
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90 | */
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91 | abstract class AbstractSelectionEvent implements SelectionChangeEvent {
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92 | private final DataSet source;
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93 | private final Set<OsmPrimitive> old;
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94 |
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95 | public AbstractSelectionEvent(DataSet source, Set<OsmPrimitive> old) {
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96 | CheckParameterUtil.ensureParameterNotNull(source, "source");
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97 | CheckParameterUtil.ensureParameterNotNull(old, "old");
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98 | this.source = source;
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99 | this.old = Collections.unmodifiableSet(old);
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100 | }
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101 |
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102 | @Override
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103 | public Set<OsmPrimitive> getOldSelection() {
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104 | return old;
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105 | }
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106 |
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107 | @Override
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108 | public DataSet getSource() {
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109 | return source;
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110 | }
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111 | }
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112 |
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113 |
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114 | /**
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115 | * The selection is replaced by a new selection
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116 | * @author Michael Zangl
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117 | * @since 12048
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118 | */
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119 | class SelectionReplaceEvent extends AbstractSelectionEvent {
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120 | private final Set<OsmPrimitive> current;
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121 | private Set<OsmPrimitive> removed;
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122 | private Set<OsmPrimitive> added;
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123 |
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124 | /**
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125 | * Create a {@link SelectionReplaceEvent}
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126 | * @param source The source dataset
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127 | * @param old The old primitves that were previously selected. The caller needs to ensure that this set is not modifed.
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128 | * @param newSelection The primitives of the new selection.
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129 | */
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130 | public SelectionReplaceEvent(DataSet source, Set<OsmPrimitive> old, Stream<OsmPrimitive> newSelection) {
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131 | super(source, old);
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132 | this.current = newSelection.collect(Collectors.toSet());
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133 | }
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134 |
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135 | @Override
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136 | public Set<OsmPrimitive> getSelection() {
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137 | return current;
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138 | }
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139 |
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140 | @Override
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141 | public synchronized Set<OsmPrimitive> getRemoved() {
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142 | if (removed == null) {
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143 | removed = getOldSelection().stream().filter(p -> !current.contains(p)).collect(Collectors.toSet());
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144 | }
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145 | return removed;
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146 | }
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147 |
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148 | @Override
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149 | public synchronized Set<OsmPrimitive> getAdded() {
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150 | if (added == null) {
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151 | added = current.stream().filter(p -> !getOldSelection().contains(p)).collect(Collectors.toSet());
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152 | }
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153 | return added;
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154 | }
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155 | }
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156 |
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157 | /**
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158 | * Primitives are added to the selection
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159 | * @author Michael Zangl
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160 | * @since 12048
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161 | */
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162 | class SelectionAddEvent extends AbstractSelectionEvent {
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163 | private final Set<OsmPrimitive> add;
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164 | private final Set<OsmPrimitive> current;
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165 |
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166 | /**
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167 | * Create a {@link SelectionAddEvent}
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168 | * @param source The source dataset
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169 | * @param old The old primitves that were previously selected. The caller needs to ensure that this set is not modifed.
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170 | * @param toAdd The primitives to add.
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171 | */
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172 | public SelectionAddEvent(DataSet source, Set<OsmPrimitive> old, Stream<OsmPrimitive> toAdd) {
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173 | super(source, old);
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174 | this.add = toAdd.filter(p -> !old.contains(p)).collect(Collectors.toSet());
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175 | if (this.add.isEmpty()) {
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176 | this.current = this.getOldSelection();
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177 | } else {
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178 | this.current = new LinkedHashSet<>(old);
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179 | this.current.addAll(add);
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180 | }
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181 | }
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182 |
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183 | @Override
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184 | public Set<OsmPrimitive> getSelection() {
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185 | return Collections.unmodifiableSet(current);
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186 | }
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187 |
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188 | @Override
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189 | public Set<OsmPrimitive> getRemoved() {
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190 | return Collections.emptySet();
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191 | }
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192 |
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193 | @Override
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194 | public Set<OsmPrimitive> getAdded() {
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195 | return Collections.unmodifiableSet(add);
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196 | }
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197 | }
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198 |
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199 | /**
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200 | * Primitives are removed from the selection
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201 | * @author Michael Zangl
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202 | * @since 12048
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203 | */
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204 | class SelectionRemoveEvent extends AbstractSelectionEvent {
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205 | private final Set<OsmPrimitive> remove;
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206 | private final Set<OsmPrimitive> current;
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207 |
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208 | /**
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209 | * Create a {@link SelectionRemoveEvent}
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210 | * @param source The source dataset
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211 | * @param old The old primitves that were previously selected. The caller needs to ensure that this set is not modifed.
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212 | * @param toRemove The primitives to remove.
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213 | */
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214 | public SelectionRemoveEvent(DataSet source, Set<OsmPrimitive> old, Stream<OsmPrimitive> toRemove) {
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215 | super(source, old);
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216 | this.remove = toRemove.filter(old::contains).collect(Collectors.toSet());
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217 | if (this.remove.isEmpty()) {
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218 | this.current = this.getOldSelection();
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219 | } else {
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220 | HashSet<OsmPrimitive> currentSet = new LinkedHashSet<>(old);
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221 | currentSet.removeAll(remove);
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222 | current = Collections.unmodifiableSet(currentSet);
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223 | }
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224 | }
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225 |
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226 | @Override
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227 | public Set<OsmPrimitive> getSelection() {
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228 | return Collections.unmodifiableSet(current);
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229 | }
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230 |
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231 | @Override
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232 | public Set<OsmPrimitive> getRemoved() {
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233 | return Collections.unmodifiableSet(remove);
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234 | }
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235 |
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236 | @Override
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237 | public Set<OsmPrimitive> getAdded() {
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238 | return Collections.emptySet();
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239 | }
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240 | }
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241 |
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242 | /**
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243 | * Toggle the selected state of a primitive
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244 | * @author Michael Zangl
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245 | * @since 12048
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246 | */
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247 | class SelectionToggleEvent extends AbstractSelectionEvent {
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248 | private final Set<OsmPrimitive> current;
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249 | private final Set<OsmPrimitive> remove;
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250 | private final Set<OsmPrimitive> add;
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251 |
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252 | /**
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253 | * Create a {@link SelectionToggleEvent}
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254 | * @param source The source dataset
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255 | * @param old The old primitves that were previously selected. The caller needs to ensure that this set is not modifed.
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256 | * @param toToggle The primitives to toggle.
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257 | */
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258 | public SelectionToggleEvent(DataSet source, Set<OsmPrimitive> old, Stream<OsmPrimitive> toToggle) {
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259 | super(source, old);
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260 | HashSet<OsmPrimitive> currentSet = new LinkedHashSet<>(old);
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261 | HashSet<OsmPrimitive> removeSet = new LinkedHashSet<>();
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262 | HashSet<OsmPrimitive> addSet = new LinkedHashSet<>();
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263 | toToggle.forEach(p -> {
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264 | if (currentSet.remove(p)) {
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265 | removeSet.add(p);
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266 | } else {
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267 | addSet.add(p);
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268 | currentSet.add(p);
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269 | }
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270 | });
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271 | this.current = Collections.unmodifiableSet(currentSet);
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272 | this.remove = Collections.unmodifiableSet(removeSet);
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273 | this.add = Collections.unmodifiableSet(addSet);
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274 | }
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275 |
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276 | @Override
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277 | public Set<OsmPrimitive> getSelection() {
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278 | return Collections.unmodifiableSet(current);
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279 | }
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280 |
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281 | @Override
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282 | public Set<OsmPrimitive> getRemoved() {
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283 | return Collections.unmodifiableSet(remove);
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284 | }
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285 |
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286 | @Override
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287 | public Set<OsmPrimitive> getAdded() {
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288 | return Collections.unmodifiableSet(add);
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289 | }
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290 | }
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291 | }
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