| 1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others |
|---|
| 2 | package org.openstreetmap.josm.actions; |
|---|
| 3 | |
|---|
| 4 | import static org.openstreetmap.josm.gui.conflict.tags.TagConflictResolutionUtil.combineTigerTags; |
|---|
| 5 | import static org.openstreetmap.josm.gui.conflict.tags.TagConflictResolutionUtil.completeTagCollectionForEditing; |
|---|
| 6 | import static org.openstreetmap.josm.gui.conflict.tags.TagConflictResolutionUtil.normalizeTagCollectionBeforeEditing; |
|---|
| 7 | import static org.openstreetmap.josm.gui.help.HelpUtil.ht; |
|---|
| 8 | import static org.openstreetmap.josm.tools.I18n.tr; |
|---|
| 9 | |
|---|
| 10 | import java.awt.event.ActionEvent; |
|---|
| 11 | import java.awt.event.KeyEvent; |
|---|
| 12 | import java.util.ArrayList; |
|---|
| 13 | import java.util.Collection; |
|---|
| 14 | import java.util.Collections; |
|---|
| 15 | import java.util.HashMap; |
|---|
| 16 | import java.util.HashSet; |
|---|
| 17 | import java.util.LinkedHashMap; |
|---|
| 18 | import java.util.LinkedHashSet; |
|---|
| 19 | import java.util.LinkedList; |
|---|
| 20 | import java.util.List; |
|---|
| 21 | import java.util.Set; |
|---|
| 22 | import java.util.Stack; |
|---|
| 23 | |
|---|
| 24 | import javax.swing.JOptionPane; |
|---|
| 25 | import javax.swing.SwingUtilities; |
|---|
| 26 | |
|---|
| 27 | import org.openstreetmap.josm.Main; |
|---|
| 28 | import org.openstreetmap.josm.command.ChangeCommand; |
|---|
| 29 | import org.openstreetmap.josm.command.Command; |
|---|
| 30 | import org.openstreetmap.josm.command.DeleteCommand; |
|---|
| 31 | import org.openstreetmap.josm.command.SequenceCommand; |
|---|
| 32 | import org.openstreetmap.josm.corrector.ReverseWayTagCorrector; |
|---|
| 33 | import org.openstreetmap.josm.corrector.UserCancelException; |
|---|
| 34 | import org.openstreetmap.josm.data.osm.Node; |
|---|
| 35 | import org.openstreetmap.josm.data.osm.OsmPrimitive; |
|---|
| 36 | import org.openstreetmap.josm.data.osm.Relation; |
|---|
| 37 | import org.openstreetmap.josm.data.osm.TagCollection; |
|---|
| 38 | import org.openstreetmap.josm.data.osm.Way; |
|---|
| 39 | import org.openstreetmap.josm.data.preferences.BooleanProperty; |
|---|
| 40 | import org.openstreetmap.josm.gui.ExtendedDialog; |
|---|
| 41 | import org.openstreetmap.josm.gui.conflict.tags.CombinePrimitiveResolverDialog; |
|---|
| 42 | import org.openstreetmap.josm.tools.Pair; |
|---|
| 43 | import org.openstreetmap.josm.tools.Shortcut; |
|---|
| 44 | |
|---|
| 45 | /** |
|---|
| 46 | * Combines multiple ways into one. |
|---|
| 47 | * |
|---|
| 48 | */ |
|---|
| 49 | public class CombineWayAction extends JosmAction { |
|---|
| 50 | |
|---|
| 51 | private static final BooleanProperty PROP_REVERSE_WAY = new BooleanProperty("tag-correction.reverse-way", true); |
|---|
| 52 | |
|---|
| 53 | public CombineWayAction() { |
|---|
| 54 | super(tr("Combine Way"), "combineway", tr("Combine several ways into one."), |
|---|
| 55 | Shortcut.registerShortcut("tools:combineway", tr("Tool: {0}", tr("Combine Way")), KeyEvent.VK_C, Shortcut.GROUP_EDIT), true); |
|---|
| 56 | putValue("help", ht("/Action/CombineWay")); |
|---|
| 57 | } |
|---|
| 58 | |
|---|
| 59 | protected static boolean confirmChangeDirectionOfWays() { |
|---|
| 60 | ExtendedDialog ed = new ExtendedDialog(Main.parent, |
|---|
| 61 | tr("Change directions?"), |
|---|
| 62 | new String[] {tr("Reverse and Combine"), tr("Cancel")}); |
|---|
| 63 | ed.setButtonIcons(new String[] {"wayflip.png", "cancel.png"}); |
|---|
| 64 | ed.setContent(tr("The ways can not be combined in their current directions. " |
|---|
| 65 | + "Do you want to reverse some of them?")); |
|---|
| 66 | ed.showDialog(); |
|---|
| 67 | return ed.getValue() == 1; |
|---|
| 68 | } |
|---|
| 69 | |
|---|
| 70 | protected static void warnCombiningImpossible() { |
|---|
| 71 | String msg = tr("Could not combine ways " |
|---|
| 72 | + "(They could not be merged into a single string of nodes)"); |
|---|
| 73 | JOptionPane.showMessageDialog( |
|---|
| 74 | Main.parent, |
|---|
| 75 | msg, |
|---|
| 76 | tr("Information"), |
|---|
| 77 | JOptionPane.INFORMATION_MESSAGE |
|---|
| 78 | ); |
|---|
| 79 | return; |
|---|
| 80 | } |
|---|
| 81 | |
|---|
| 82 | protected static Way getTargetWay(Collection<Way> combinedWays) { |
|---|
| 83 | // init with an arbitrary way |
|---|
| 84 | Way targetWay = combinedWays.iterator().next(); |
|---|
| 85 | |
|---|
| 86 | // look for the first way already existing on |
|---|
| 87 | // the server |
|---|
| 88 | for (Way w : combinedWays) { |
|---|
| 89 | targetWay = w; |
|---|
| 90 | if (!w.isNew()) { |
|---|
| 91 | break; |
|---|
| 92 | } |
|---|
| 93 | } |
|---|
| 94 | return targetWay; |
|---|
| 95 | } |
|---|
| 96 | |
|---|
| 97 | /** |
|---|
| 98 | * Replies the set of referring relations |
|---|
| 99 | * |
|---|
| 100 | * @return the set of referring relations |
|---|
| 101 | */ |
|---|
| 102 | public static Set<Relation> getParentRelations(Collection<Way> ways) { |
|---|
| 103 | HashSet<Relation> ret = new HashSet<Relation>(); |
|---|
| 104 | for (Way w: ways) { |
|---|
| 105 | ret.addAll(OsmPrimitive.getFilteredList(w.getReferrers(), Relation.class)); |
|---|
| 106 | } |
|---|
| 107 | return ret; |
|---|
| 108 | } |
|---|
| 109 | |
|---|
| 110 | /** |
|---|
| 111 | * @param ways |
|---|
| 112 | * @return null if ways cannot be combined. Otherwise returns the combined |
|---|
| 113 | * ways and the commands to combine |
|---|
| 114 | * @throws UserCancelException |
|---|
| 115 | */ |
|---|
| 116 | public static Pair<Way, Command> combineWaysWorker(Collection<Way> ways) throws UserCancelException { |
|---|
| 117 | |
|---|
| 118 | // prepare and clean the list of ways to combine |
|---|
| 119 | // |
|---|
| 120 | if (ways == null || ways.isEmpty()) |
|---|
| 121 | return null; |
|---|
| 122 | ways.remove(null); // just in case - remove all null ways from the collection |
|---|
| 123 | |
|---|
| 124 | // remove duplicates, preserving order |
|---|
| 125 | ways = new LinkedHashSet<Way>(ways); |
|---|
| 126 | |
|---|
| 127 | // try to build a new way which includes all the combined |
|---|
| 128 | // ways |
|---|
| 129 | // |
|---|
| 130 | NodeGraph graph = NodeGraph.createUndirectedGraphFromNodeWays(ways); |
|---|
| 131 | List<Node> path = graph.buildSpanningPath(); |
|---|
| 132 | if (path == null) { |
|---|
| 133 | warnCombiningImpossible(); |
|---|
| 134 | return null; |
|---|
| 135 | } |
|---|
| 136 | // check whether any ways have been reversed in the process |
|---|
| 137 | // and build the collection of tags used by the ways to combine |
|---|
| 138 | // |
|---|
| 139 | TagCollection wayTags = TagCollection.unionOfAllPrimitives(ways); |
|---|
| 140 | |
|---|
| 141 | List<Way> reversedWays = new LinkedList<Way>(); |
|---|
| 142 | List<Way> unreversedWays = new LinkedList<Way>(); |
|---|
| 143 | for (Way w: ways) { |
|---|
| 144 | if ((path.indexOf(w.getNode(0)) + 1) == path.lastIndexOf(w.getNode(1))) { |
|---|
| 145 | unreversedWays.add(w); |
|---|
| 146 | } else { |
|---|
| 147 | reversedWays.add(w); |
|---|
| 148 | } |
|---|
| 149 | } |
|---|
| 150 | // reverse path if all ways have been reversed |
|---|
| 151 | if (unreversedWays.isEmpty()) { |
|---|
| 152 | Collections.reverse(path); |
|---|
| 153 | unreversedWays = reversedWays; |
|---|
| 154 | reversedWays = null; |
|---|
| 155 | } |
|---|
| 156 | if ((reversedWays != null) && !reversedWays.isEmpty()) { |
|---|
| 157 | if (!confirmChangeDirectionOfWays()) return null; |
|---|
| 158 | // filter out ways that have no direction-dependent tags |
|---|
| 159 | unreversedWays = ReverseWayTagCorrector.irreversibleWays(unreversedWays); |
|---|
| 160 | reversedWays = ReverseWayTagCorrector.irreversibleWays(reversedWays); |
|---|
| 161 | // reverse path if there are more reversed than unreversed ways with direction-dependent tags |
|---|
| 162 | if (reversedWays.size() > unreversedWays.size()) { |
|---|
| 163 | Collections.reverse(path); |
|---|
| 164 | List<Way> tempWays = unreversedWays; |
|---|
| 165 | unreversedWays = reversedWays; |
|---|
| 166 | reversedWays = tempWays; |
|---|
| 167 | } |
|---|
| 168 | // if there are still reversed ways with direction-dependent tags, reverse their tags |
|---|
| 169 | if (!reversedWays.isEmpty() && PROP_REVERSE_WAY.get()) { |
|---|
| 170 | List<Way> unreversedTagWays = new ArrayList<Way>(ways); |
|---|
| 171 | unreversedTagWays.removeAll(reversedWays); |
|---|
| 172 | ReverseWayTagCorrector reverseWayTagCorrector = new ReverseWayTagCorrector(); |
|---|
| 173 | List<Way> reversedTagWays = new ArrayList<Way>(); |
|---|
| 174 | Collection<Command> changePropertyCommands = null; |
|---|
| 175 | for (Way w : reversedWays) { |
|---|
| 176 | Way wnew = new Way(w); |
|---|
| 177 | reversedTagWays.add(wnew); |
|---|
| 178 | changePropertyCommands = reverseWayTagCorrector.execute(w, wnew); |
|---|
| 179 | } |
|---|
| 180 | if ((changePropertyCommands != null) && !changePropertyCommands.isEmpty()) { |
|---|
| 181 | for (Command c : changePropertyCommands) { |
|---|
| 182 | c.executeCommand(); |
|---|
| 183 | } |
|---|
| 184 | } |
|---|
| 185 | wayTags = TagCollection.unionOfAllPrimitives(reversedTagWays); |
|---|
| 186 | wayTags.add(TagCollection.unionOfAllPrimitives(unreversedTagWays)); |
|---|
| 187 | } |
|---|
| 188 | } |
|---|
| 189 | |
|---|
| 190 | // create the new way and apply the new node list |
|---|
| 191 | // |
|---|
| 192 | Way targetWay = getTargetWay(ways); |
|---|
| 193 | Way modifiedTargetWay = new Way(targetWay); |
|---|
| 194 | modifiedTargetWay.setNodes(path); |
|---|
| 195 | |
|---|
| 196 | TagCollection completeWayTags = new TagCollection(wayTags); |
|---|
| 197 | combineTigerTags(completeWayTags); |
|---|
| 198 | normalizeTagCollectionBeforeEditing(completeWayTags, ways); |
|---|
| 199 | TagCollection tagsToEdit = new TagCollection(completeWayTags); |
|---|
| 200 | completeTagCollectionForEditing(tagsToEdit); |
|---|
| 201 | |
|---|
| 202 | CombinePrimitiveResolverDialog dialog = CombinePrimitiveResolverDialog.getInstance(); |
|---|
| 203 | dialog.getTagConflictResolverModel().populate(tagsToEdit, completeWayTags.getKeysWithMultipleValues()); |
|---|
| 204 | dialog.setTargetPrimitive(targetWay); |
|---|
| 205 | Set<Relation> parentRelations = getParentRelations(ways); |
|---|
| 206 | dialog.getRelationMemberConflictResolverModel().populate( |
|---|
| 207 | parentRelations, |
|---|
| 208 | ways |
|---|
| 209 | ); |
|---|
| 210 | dialog.prepareDefaultDecisions(); |
|---|
| 211 | |
|---|
| 212 | // resolve tag conflicts if necessary |
|---|
| 213 | // |
|---|
| 214 | if (!completeWayTags.isApplicableToPrimitive() || !parentRelations.isEmpty()) { |
|---|
| 215 | dialog.setVisible(true); |
|---|
| 216 | if (dialog.isCanceled()) |
|---|
| 217 | throw new UserCancelException(); |
|---|
| 218 | } |
|---|
| 219 | |
|---|
| 220 | LinkedList<Command> cmds = new LinkedList<Command>(); |
|---|
| 221 | LinkedList<Way> deletedWays = new LinkedList<Way>(ways); |
|---|
| 222 | deletedWays.remove(targetWay); |
|---|
| 223 | |
|---|
| 224 | cmds.add(new ChangeCommand(targetWay, modifiedTargetWay)); |
|---|
| 225 | cmds.addAll(dialog.buildResolutionCommands()); |
|---|
| 226 | cmds.add(new DeleteCommand(deletedWays)); |
|---|
| 227 | final SequenceCommand sequenceCommand = new SequenceCommand(tr("Combine {0} ways", ways.size()), cmds); |
|---|
| 228 | |
|---|
| 229 | return new Pair<Way, Command>(targetWay, sequenceCommand); |
|---|
| 230 | } |
|---|
| 231 | |
|---|
| 232 | public void actionPerformed(ActionEvent event) { |
|---|
| 233 | if (getCurrentDataSet() == null) |
|---|
| 234 | return; |
|---|
| 235 | Collection<OsmPrimitive> selection = getCurrentDataSet().getSelected(); |
|---|
| 236 | Set<Way> selectedWays = OsmPrimitive.getFilteredSet(selection, Way.class); |
|---|
| 237 | if (selectedWays.size() < 2) { |
|---|
| 238 | JOptionPane.showMessageDialog( |
|---|
| 239 | Main.parent, |
|---|
| 240 | tr("Please select at least two ways to combine."), |
|---|
| 241 | tr("Information"), |
|---|
| 242 | JOptionPane.INFORMATION_MESSAGE |
|---|
| 243 | ); |
|---|
| 244 | return; |
|---|
| 245 | } |
|---|
| 246 | // combine and update gui |
|---|
| 247 | Pair<Way, Command> combineResult; |
|---|
| 248 | try { |
|---|
| 249 | combineResult = combineWaysWorker(selectedWays); |
|---|
| 250 | } catch (UserCancelException ex) { |
|---|
| 251 | return; |
|---|
| 252 | } |
|---|
| 253 | |
|---|
| 254 | if (combineResult == null) |
|---|
| 255 | return; |
|---|
| 256 | final Way selectedWay = combineResult.a; |
|---|
| 257 | Main.main.undoRedo.add(combineResult.b); |
|---|
| 258 | if(selectedWay != null) |
|---|
| 259 | { |
|---|
| 260 | Runnable guiTask = new Runnable() { |
|---|
| 261 | public void run() { |
|---|
| 262 | getCurrentDataSet().setSelected(selectedWay); |
|---|
| 263 | } |
|---|
| 264 | }; |
|---|
| 265 | if (SwingUtilities.isEventDispatchThread()) { |
|---|
| 266 | guiTask.run(); |
|---|
| 267 | } else { |
|---|
| 268 | SwingUtilities.invokeLater(guiTask); |
|---|
| 269 | } |
|---|
| 270 | } |
|---|
| 271 | } |
|---|
| 272 | |
|---|
| 273 | @Override |
|---|
| 274 | protected void updateEnabledState() { |
|---|
| 275 | if (getCurrentDataSet() == null) { |
|---|
| 276 | setEnabled(false); |
|---|
| 277 | return; |
|---|
| 278 | } |
|---|
| 279 | Collection<OsmPrimitive> selection = getCurrentDataSet().getSelected(); |
|---|
| 280 | updateEnabledState(selection); |
|---|
| 281 | } |
|---|
| 282 | |
|---|
| 283 | @Override |
|---|
| 284 | protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) { |
|---|
| 285 | int numWays = 0; |
|---|
| 286 | for (OsmPrimitive osm : selection) |
|---|
| 287 | if (osm instanceof Way) { |
|---|
| 288 | numWays++; |
|---|
| 289 | } |
|---|
| 290 | setEnabled(numWays >= 2); |
|---|
| 291 | } |
|---|
| 292 | |
|---|
| 293 | static public class NodePair { |
|---|
| 294 | private Node a; |
|---|
| 295 | private Node b; |
|---|
| 296 | public NodePair(Node a, Node b) { |
|---|
| 297 | this.a =a; |
|---|
| 298 | this.b = b; |
|---|
| 299 | } |
|---|
| 300 | |
|---|
| 301 | public NodePair(Pair<Node,Node> pair) { |
|---|
| 302 | this.a = pair.a; |
|---|
| 303 | this.b = pair.b; |
|---|
| 304 | } |
|---|
| 305 | |
|---|
| 306 | public NodePair(NodePair other) { |
|---|
| 307 | this.a = other.a; |
|---|
| 308 | this.b = other.b; |
|---|
| 309 | } |
|---|
| 310 | |
|---|
| 311 | public Node getA() { |
|---|
| 312 | return a; |
|---|
| 313 | } |
|---|
| 314 | |
|---|
| 315 | public Node getB() { |
|---|
| 316 | return b; |
|---|
| 317 | } |
|---|
| 318 | |
|---|
| 319 | public boolean isAdjacentToA(NodePair other) { |
|---|
| 320 | return other.getA() == a || other.getB() == a; |
|---|
| 321 | } |
|---|
| 322 | |
|---|
| 323 | public boolean isAdjacentToB(NodePair other) { |
|---|
| 324 | return other.getA() == b || other.getB() == b; |
|---|
| 325 | } |
|---|
| 326 | |
|---|
| 327 | public boolean isSuccessorOf(NodePair other) { |
|---|
| 328 | return other.getB() == a; |
|---|
| 329 | } |
|---|
| 330 | |
|---|
| 331 | public boolean isPredecessorOf(NodePair other) { |
|---|
| 332 | return b == other.getA(); |
|---|
| 333 | } |
|---|
| 334 | |
|---|
| 335 | public NodePair swap() { |
|---|
| 336 | return new NodePair(b,a); |
|---|
| 337 | } |
|---|
| 338 | |
|---|
| 339 | @Override |
|---|
| 340 | public String toString() { |
|---|
| 341 | return new StringBuilder() |
|---|
| 342 | .append("[") |
|---|
| 343 | .append(a.getId()) |
|---|
| 344 | .append(",") |
|---|
| 345 | .append(b.getId()) |
|---|
| 346 | .append("]") |
|---|
| 347 | .toString(); |
|---|
| 348 | } |
|---|
| 349 | |
|---|
| 350 | public boolean contains(Node n) { |
|---|
| 351 | return a == n || b == n; |
|---|
| 352 | } |
|---|
| 353 | |
|---|
| 354 | @Override |
|---|
| 355 | public int hashCode() { |
|---|
| 356 | final int prime = 31; |
|---|
| 357 | int result = 1; |
|---|
| 358 | result = prime * result + ((a == null) ? 0 : a.hashCode()); |
|---|
| 359 | result = prime * result + ((b == null) ? 0 : b.hashCode()); |
|---|
| 360 | return result; |
|---|
| 361 | } |
|---|
| 362 | @Override |
|---|
| 363 | public boolean equals(Object obj) { |
|---|
| 364 | if (this == obj) |
|---|
| 365 | return true; |
|---|
| 366 | if (obj == null) |
|---|
| 367 | return false; |
|---|
| 368 | if (getClass() != obj.getClass()) |
|---|
| 369 | return false; |
|---|
| 370 | NodePair other = (NodePair) obj; |
|---|
| 371 | if (a == null) { |
|---|
| 372 | if (other.a != null) |
|---|
| 373 | return false; |
|---|
| 374 | } else if (!a.equals(other.a)) |
|---|
| 375 | return false; |
|---|
| 376 | if (b == null) { |
|---|
| 377 | if (other.b != null) |
|---|
| 378 | return false; |
|---|
| 379 | } else if (!b.equals(other.b)) |
|---|
| 380 | return false; |
|---|
| 381 | return true; |
|---|
| 382 | } |
|---|
| 383 | } |
|---|
| 384 | |
|---|
| 385 | static public class NodeGraph { |
|---|
| 386 | static public List<NodePair> buildNodePairs(Way way, boolean directed) { |
|---|
| 387 | ArrayList<NodePair> pairs = new ArrayList<NodePair>(); |
|---|
| 388 | for (Pair<Node,Node> pair: way.getNodePairs(false /* don't sort */)) { |
|---|
| 389 | pairs.add(new NodePair(pair)); |
|---|
| 390 | if (!directed) { |
|---|
| 391 | pairs.add(new NodePair(pair).swap()); |
|---|
| 392 | } |
|---|
| 393 | } |
|---|
| 394 | return pairs; |
|---|
| 395 | } |
|---|
| 396 | |
|---|
| 397 | static public List<NodePair> buildNodePairs(List<Way> ways, boolean directed) { |
|---|
| 398 | ArrayList<NodePair> pairs = new ArrayList<NodePair>(); |
|---|
| 399 | for (Way w: ways) { |
|---|
| 400 | pairs.addAll(buildNodePairs(w, directed)); |
|---|
| 401 | } |
|---|
| 402 | return pairs; |
|---|
| 403 | } |
|---|
| 404 | |
|---|
| 405 | static public List<NodePair> eliminateDuplicateNodePairs(List<NodePair> pairs) { |
|---|
| 406 | ArrayList<NodePair> cleaned = new ArrayList<NodePair>(); |
|---|
| 407 | for(NodePair p: pairs) { |
|---|
| 408 | if (!cleaned.contains(p) && !cleaned.contains(p.swap())) { |
|---|
| 409 | cleaned.add(p); |
|---|
| 410 | } |
|---|
| 411 | } |
|---|
| 412 | return cleaned; |
|---|
| 413 | } |
|---|
| 414 | |
|---|
| 415 | static public NodeGraph createDirectedGraphFromNodePairs(List<NodePair> pairs) { |
|---|
| 416 | NodeGraph graph = new NodeGraph(); |
|---|
| 417 | for (NodePair pair: pairs) { |
|---|
| 418 | graph.add(pair); |
|---|
| 419 | } |
|---|
| 420 | return graph; |
|---|
| 421 | } |
|---|
| 422 | |
|---|
| 423 | static public NodeGraph createDirectedGraphFromWays(Collection<Way> ways) { |
|---|
| 424 | NodeGraph graph = new NodeGraph(); |
|---|
| 425 | for (Way w: ways) { |
|---|
| 426 | graph.add(buildNodePairs(w, true /* directed */)); |
|---|
| 427 | } |
|---|
| 428 | return graph; |
|---|
| 429 | } |
|---|
| 430 | |
|---|
| 431 | static public NodeGraph createUndirectedGraphFromNodeList(List<NodePair> pairs) { |
|---|
| 432 | NodeGraph graph = new NodeGraph(); |
|---|
| 433 | for (NodePair pair: pairs) { |
|---|
| 434 | graph.add(pair); |
|---|
| 435 | graph.add(pair.swap()); |
|---|
| 436 | } |
|---|
| 437 | return graph; |
|---|
| 438 | } |
|---|
| 439 | |
|---|
| 440 | static public NodeGraph createUndirectedGraphFromNodeWays(Collection<Way> ways) { |
|---|
| 441 | NodeGraph graph = new NodeGraph(); |
|---|
| 442 | for (Way w: ways) { |
|---|
| 443 | graph.add(buildNodePairs(w, false /* undirected */)); |
|---|
| 444 | } |
|---|
| 445 | return graph; |
|---|
| 446 | } |
|---|
| 447 | |
|---|
| 448 | private Set<NodePair> edges; |
|---|
| 449 | private int numUndirectedEges = 0; |
|---|
| 450 | private HashMap<Node, List<NodePair>> successors; |
|---|
| 451 | private HashMap<Node, List<NodePair>> predecessors; |
|---|
| 452 | |
|---|
| 453 | protected void rememberSuccessor(NodePair pair) { |
|---|
| 454 | if (successors.containsKey(pair.getA())) { |
|---|
| 455 | if (!successors.get(pair.getA()).contains(pair)) { |
|---|
| 456 | successors.get(pair.getA()).add(pair); |
|---|
| 457 | } |
|---|
| 458 | } else { |
|---|
| 459 | ArrayList<NodePair> l = new ArrayList<NodePair>(); |
|---|
| 460 | l.add(pair); |
|---|
| 461 | successors.put(pair.getA(), l); |
|---|
| 462 | } |
|---|
| 463 | } |
|---|
| 464 | |
|---|
| 465 | protected void rememberPredecessors(NodePair pair) { |
|---|
| 466 | if (predecessors.containsKey(pair.getB())) { |
|---|
| 467 | if (!predecessors.get(pair.getB()).contains(pair)) { |
|---|
| 468 | predecessors.get(pair.getB()).add(pair); |
|---|
| 469 | } |
|---|
| 470 | } else { |
|---|
| 471 | ArrayList<NodePair> l = new ArrayList<NodePair>(); |
|---|
| 472 | l.add(pair); |
|---|
| 473 | predecessors.put(pair.getB(), l); |
|---|
| 474 | } |
|---|
| 475 | } |
|---|
| 476 | |
|---|
| 477 | protected boolean isTerminalNode(Node n) { |
|---|
| 478 | if (successors.get(n) == null) return false; |
|---|
| 479 | if (successors.get(n).size() != 1) return false; |
|---|
| 480 | if (predecessors.get(n) == null) return true; |
|---|
| 481 | if (predecessors.get(n).size() == 1) { |
|---|
| 482 | NodePair p1 = successors.get(n).iterator().next(); |
|---|
| 483 | NodePair p2 = predecessors.get(n).iterator().next(); |
|---|
| 484 | return p1.equals(p2.swap()); |
|---|
| 485 | } |
|---|
| 486 | return false; |
|---|
| 487 | } |
|---|
| 488 | |
|---|
| 489 | protected void prepare() { |
|---|
| 490 | Set<NodePair> undirectedEdges = new LinkedHashSet<NodePair>(); |
|---|
| 491 | successors = new LinkedHashMap<Node, List<NodePair>>(); |
|---|
| 492 | predecessors = new LinkedHashMap<Node, List<NodePair>>(); |
|---|
| 493 | |
|---|
| 494 | for (NodePair pair: edges) { |
|---|
| 495 | if (!undirectedEdges.contains(pair) && ! undirectedEdges.contains(pair.swap())) { |
|---|
| 496 | undirectedEdges.add(pair); |
|---|
| 497 | } |
|---|
| 498 | rememberSuccessor(pair); |
|---|
| 499 | rememberPredecessors(pair); |
|---|
| 500 | } |
|---|
| 501 | numUndirectedEges = undirectedEdges.size(); |
|---|
| 502 | } |
|---|
| 503 | |
|---|
| 504 | public NodeGraph() { |
|---|
| 505 | edges = new LinkedHashSet<NodePair>(); |
|---|
| 506 | } |
|---|
| 507 | |
|---|
| 508 | public void add(NodePair pair) { |
|---|
| 509 | if (!edges.contains(pair)) { |
|---|
| 510 | edges.add(pair); |
|---|
| 511 | } |
|---|
| 512 | } |
|---|
| 513 | |
|---|
| 514 | public void add(List<NodePair> pairs) { |
|---|
| 515 | for (NodePair pair: pairs) { |
|---|
| 516 | add(pair); |
|---|
| 517 | } |
|---|
| 518 | } |
|---|
| 519 | |
|---|
| 520 | protected Node getStartNode() { |
|---|
| 521 | Set<Node> nodes = getNodes(); |
|---|
| 522 | for (Node n: nodes) { |
|---|
| 523 | if (successors.get(n) != null && successors.get(n).size() ==1) |
|---|
| 524 | return n; |
|---|
| 525 | } |
|---|
| 526 | return null; |
|---|
| 527 | } |
|---|
| 528 | |
|---|
| 529 | protected Set<Node> getTerminalNodes() { |
|---|
| 530 | Set<Node> ret = new LinkedHashSet<Node>(); |
|---|
| 531 | for (Node n: getNodes()) { |
|---|
| 532 | if (isTerminalNode(n)) { |
|---|
| 533 | ret.add(n); |
|---|
| 534 | } |
|---|
| 535 | } |
|---|
| 536 | return ret; |
|---|
| 537 | } |
|---|
| 538 | |
|---|
| 539 | protected Set<Node> getNodes(Stack<NodePair> pairs) { |
|---|
| 540 | HashSet<Node> nodes = new LinkedHashSet<Node>(); |
|---|
| 541 | for (NodePair pair: pairs) { |
|---|
| 542 | nodes.add(pair.getA()); |
|---|
| 543 | nodes.add(pair.getB()); |
|---|
| 544 | } |
|---|
| 545 | return nodes; |
|---|
| 546 | } |
|---|
| 547 | |
|---|
| 548 | protected List<NodePair> getOutboundPairs(NodePair pair) { |
|---|
| 549 | return getOutboundPairs(pair.getB()); |
|---|
| 550 | } |
|---|
| 551 | |
|---|
| 552 | protected List<NodePair> getOutboundPairs(Node node) { |
|---|
| 553 | List<NodePair> l = successors.get(node); |
|---|
| 554 | if (l == null) |
|---|
| 555 | return Collections.emptyList(); |
|---|
| 556 | return l; |
|---|
| 557 | } |
|---|
| 558 | |
|---|
| 559 | protected Set<Node> getNodes() { |
|---|
| 560 | Set<Node> nodes = new LinkedHashSet<Node>(); |
|---|
| 561 | for (NodePair pair: edges) { |
|---|
| 562 | nodes.add(pair.getA()); |
|---|
| 563 | nodes.add(pair.getB()); |
|---|
| 564 | } |
|---|
| 565 | return nodes; |
|---|
| 566 | } |
|---|
| 567 | |
|---|
| 568 | protected boolean isSpanningWay(Stack<NodePair> way) { |
|---|
| 569 | return numUndirectedEges == way.size(); |
|---|
| 570 | } |
|---|
| 571 | |
|---|
| 572 | protected List<Node> buildPathFromNodePairs(Stack<NodePair> path) { |
|---|
| 573 | LinkedList<Node> ret = new LinkedList<Node>(); |
|---|
| 574 | for (NodePair pair: path) { |
|---|
| 575 | ret.add(pair.getA()); |
|---|
| 576 | } |
|---|
| 577 | ret.add(path.peek().getB()); |
|---|
| 578 | return ret; |
|---|
| 579 | } |
|---|
| 580 | |
|---|
| 581 | /** |
|---|
| 582 | * Tries to find a spanning path starting from node <code>startNode</code>. |
|---|
| 583 | * |
|---|
| 584 | * Traverses the path in depth-first order. |
|---|
| 585 | * |
|---|
| 586 | * @param startNode the start node |
|---|
| 587 | * @return the spanning path; null, if no path is found |
|---|
| 588 | */ |
|---|
| 589 | protected List<Node> buildSpanningPath(Node startNode) { |
|---|
| 590 | if (startNode == null) |
|---|
| 591 | return null; |
|---|
| 592 | Stack<NodePair> path = new Stack<NodePair>(); |
|---|
| 593 | Stack<NodePair> nextPairs = new Stack<NodePair>(); |
|---|
| 594 | nextPairs.addAll(getOutboundPairs(startNode)); |
|---|
| 595 | while(!nextPairs.isEmpty()) { |
|---|
| 596 | NodePair cur= nextPairs.pop(); |
|---|
| 597 | if (! path.contains(cur) && ! path.contains(cur.swap())) { |
|---|
| 598 | while(!path.isEmpty() && !path.peek().isPredecessorOf(cur)) { |
|---|
| 599 | path.pop(); |
|---|
| 600 | } |
|---|
| 601 | path.push(cur); |
|---|
| 602 | if (isSpanningWay(path)) return buildPathFromNodePairs(path); |
|---|
| 603 | nextPairs.addAll(getOutboundPairs(path.peek())); |
|---|
| 604 | } |
|---|
| 605 | } |
|---|
| 606 | return null; |
|---|
| 607 | } |
|---|
| 608 | |
|---|
| 609 | /** |
|---|
| 610 | * Tries to find a path through the graph which visits each edge (i.e. |
|---|
| 611 | * the segment of a way) exactly one. |
|---|
| 612 | * |
|---|
| 613 | * @return the path; null, if no path was found |
|---|
| 614 | */ |
|---|
| 615 | public List<Node> buildSpanningPath() { |
|---|
| 616 | prepare(); |
|---|
| 617 | // try to find a path from each "terminal node", i.e. from a |
|---|
| 618 | // node which is connected by exactly one undirected edges (or |
|---|
| 619 | // two directed edges in opposite direction) to the graph. A |
|---|
| 620 | // graph built up from way segments is likely to include such |
|---|
| 621 | // nodes, unless all ways are closed. |
|---|
| 622 | // In the worst case this loops over all nodes which is |
|---|
| 623 | // very slow for large ways. |
|---|
| 624 | // |
|---|
| 625 | Set<Node> nodes = getTerminalNodes(); |
|---|
| 626 | nodes = nodes.isEmpty() ? getNodes() : nodes; |
|---|
| 627 | for (Node n: nodes) { |
|---|
| 628 | List<Node> path = buildSpanningPath(n); |
|---|
| 629 | if (path != null) |
|---|
| 630 | return path; |
|---|
| 631 | } |
|---|
| 632 | return null; |
|---|
| 633 | } |
|---|
| 634 | } |
|---|
| 635 | } |
|---|