001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.gui.conflict.tags;
003
004import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
005import static org.openstreetmap.josm.tools.I18n.tr;
006import static org.openstreetmap.josm.tools.I18n.trn;
007
008import java.awt.BorderLayout;
009import java.awt.Component;
010import java.awt.Dimension;
011import java.awt.FlowLayout;
012import java.awt.GraphicsEnvironment;
013import java.awt.event.ActionEvent;
014import java.awt.event.HierarchyBoundsListener;
015import java.awt.event.HierarchyEvent;
016import java.awt.event.WindowAdapter;
017import java.awt.event.WindowEvent;
018import java.beans.PropertyChangeEvent;
019import java.beans.PropertyChangeListener;
020import java.util.Collection;
021import java.util.LinkedList;
022import java.util.List;
023import java.util.Set;
024
025import javax.swing.AbstractAction;
026import javax.swing.Action;
027import javax.swing.JDialog;
028import javax.swing.JLabel;
029import javax.swing.JOptionPane;
030import javax.swing.JPanel;
031import javax.swing.JSplitPane;
032
033import org.openstreetmap.josm.Main;
034import org.openstreetmap.josm.actions.ExpertToggleAction;
035import org.openstreetmap.josm.command.ChangePropertyCommand;
036import org.openstreetmap.josm.command.Command;
037import org.openstreetmap.josm.data.osm.Node;
038import org.openstreetmap.josm.data.osm.OsmPrimitive;
039import org.openstreetmap.josm.data.osm.Relation;
040import org.openstreetmap.josm.data.osm.TagCollection;
041import org.openstreetmap.josm.data.osm.Way;
042import org.openstreetmap.josm.gui.ConditionalOptionPaneUtil;
043import org.openstreetmap.josm.gui.DefaultNameFormatter;
044import org.openstreetmap.josm.gui.SideButton;
045import org.openstreetmap.josm.gui.help.ContextSensitiveHelpAction;
046import org.openstreetmap.josm.gui.help.HelpUtil;
047import org.openstreetmap.josm.gui.util.GuiHelper;
048import org.openstreetmap.josm.tools.CheckParameterUtil;
049import org.openstreetmap.josm.tools.ImageProvider;
050import org.openstreetmap.josm.tools.UserCancelException;
051import org.openstreetmap.josm.tools.Utils;
052import org.openstreetmap.josm.tools.Utils.Function;
053import org.openstreetmap.josm.tools.WindowGeometry;
054
055/**
056 * This dialog helps to resolve conflicts occurring when ways are combined or
057 * nodes are merged.
058 *
059 * Usage: {@link #launchIfNecessary} followed by {@link #buildResolutionCommands}.
060 *
061 * Prior to {@link #launchIfNecessary}, the following usage sequence was needed:
062 *
063 * There is a singleton instance of this dialog which can be retrieved using
064 * {@link #getInstance()}.
065 *
066 * The dialog uses two models: one  for resolving tag conflicts, the other
067 * for resolving conflicts in relation memberships. For both models there are accessors,
068 * i.e {@link #getTagConflictResolverModel()} and {@link #getRelationMemberConflictResolverModel()}.
069 *
070 * Models have to be <strong>populated</strong> before the dialog is launched. Example:
071 * <pre>
072 *    CombinePrimitiveResolverDialog dialog = CombinePrimitiveResolverDialog.getInstance();
073 *    dialog.getTagConflictResolverModel().populate(aTagCollection);
074 *    dialog.getRelationMemberConflictResolverModel().populate(aRelationLinkCollection);
075 *    dialog.prepareDefaultDecisions();
076 * </pre>
077 *
078 * You should also set the target primitive which other primitives (ways or nodes) are
079 * merged to, see {@link #setTargetPrimitive(OsmPrimitive)}.
080 *
081 * After the dialog is closed use {@link #isApplied()} to check whether the dialog has been
082 * applied. If it was applied you may build a collection of {@link Command} objects
083 * which reflect the conflict resolution decisions the user made in the dialog:
084 * see {@link #buildResolutionCommands()}
085 */
086public class CombinePrimitiveResolverDialog extends JDialog {
087
088    /** the unique instance of the dialog */
089    private static CombinePrimitiveResolverDialog instance;
090
091    /**
092     * Replies the unique instance of the dialog
093     *
094     * @return the unique instance of the dialog
095     * @deprecated use {@link #launchIfNecessary} instead.
096     */
097    @Deprecated
098    public static synchronized CombinePrimitiveResolverDialog getInstance() {
099        if (instance == null) {
100            GuiHelper.runInEDTAndWait(new Runnable() {
101                @Override public void run() {
102                    instance = new CombinePrimitiveResolverDialog(Main.parent);
103                }
104            });
105        }
106        return instance;
107    }
108
109    private AutoAdjustingSplitPane spTagConflictTypes;
110    private TagConflictResolver pnlTagConflictResolver;
111    protected RelationMemberConflictResolver pnlRelationMemberConflictResolver;
112    private boolean applied;
113    private JPanel pnlButtons;
114    protected transient OsmPrimitive targetPrimitive;
115
116    /** the private help action */
117    private ContextSensitiveHelpAction helpAction;
118    /** the apply button */
119    private SideButton btnApply;
120
121    /**
122     * Replies the target primitive the collection of primitives is merged
123     * or combined to.
124     *
125     * @return the target primitive
126     */
127    public OsmPrimitive getTargetPrimitmive() {
128        return targetPrimitive;
129    }
130
131    /**
132     * Sets the primitive the collection of primitives is merged or combined to.
133     *
134     * @param primitive the target primitive
135     */
136    public void setTargetPrimitive(final OsmPrimitive primitive) {
137        this.targetPrimitive = primitive;
138        GuiHelper.runInEDTAndWait(new Runnable() {
139            @Override public void run() {
140                updateTitle();
141                if (primitive instanceof Way) {
142                    pnlRelationMemberConflictResolver.initForWayCombining();
143                } else if (primitive instanceof Node) {
144                    pnlRelationMemberConflictResolver.initForNodeMerging();
145                }
146            }
147        });
148    }
149
150    protected void updateTitle() {
151        if (targetPrimitive == null) {
152            setTitle(tr("Conflicts when combining primitives"));
153            return;
154        }
155        if (targetPrimitive instanceof Way) {
156            setTitle(tr("Conflicts when combining ways - combined way is ''{0}''", targetPrimitive
157                    .getDisplayName(DefaultNameFormatter.getInstance())));
158            helpAction.setHelpTopic(ht("/Action/CombineWay#ResolvingConflicts"));
159            getRootPane().putClientProperty("help", ht("/Action/CombineWay#ResolvingConflicts"));
160        } else if (targetPrimitive instanceof Node) {
161            setTitle(tr("Conflicts when merging nodes - target node is ''{0}''", targetPrimitive
162                    .getDisplayName(DefaultNameFormatter.getInstance())));
163            helpAction.setHelpTopic(ht("/Action/MergeNodes#ResolvingConflicts"));
164            getRootPane().putClientProperty("help", ht("/Action/MergeNodes#ResolvingConflicts"));
165        }
166    }
167
168    protected final void build() {
169        getContentPane().setLayout(new BorderLayout());
170        updateTitle();
171        spTagConflictTypes = new AutoAdjustingSplitPane(JSplitPane.VERTICAL_SPLIT);
172        spTagConflictTypes.setTopComponent(buildTagConflictResolverPanel());
173        spTagConflictTypes.setBottomComponent(buildRelationMemberConflictResolverPanel());
174        getContentPane().add(pnlButtons = buildButtonPanel(), BorderLayout.SOUTH);
175        addWindowListener(new AdjustDividerLocationAction());
176        HelpUtil.setHelpContext(getRootPane(), ht("/"));
177    }
178
179    protected JPanel buildTagConflictResolverPanel() {
180        pnlTagConflictResolver = new TagConflictResolver();
181        return pnlTagConflictResolver;
182    }
183
184    protected JPanel buildRelationMemberConflictResolverPanel() {
185        pnlRelationMemberConflictResolver = new RelationMemberConflictResolver(new RelationMemberConflictResolverModel());
186        return pnlRelationMemberConflictResolver;
187    }
188
189    protected ApplyAction buildApplyAction() {
190        return new ApplyAction();
191    }
192
193    protected JPanel buildButtonPanel() {
194        JPanel pnl = new JPanel(new FlowLayout(FlowLayout.CENTER));
195
196        // -- apply button
197        ApplyAction applyAction = buildApplyAction();
198        pnlTagConflictResolver.getModel().addPropertyChangeListener(applyAction);
199        pnlRelationMemberConflictResolver.getModel().addPropertyChangeListener(applyAction);
200        btnApply = new SideButton(applyAction);
201        btnApply.setFocusable(true);
202        pnl.add(btnApply);
203
204        // -- cancel button
205        CancelAction cancelAction = new CancelAction();
206        pnl.add(new SideButton(cancelAction));
207
208        // -- help button
209        helpAction = new ContextSensitiveHelpAction();
210        pnl.add(new SideButton(helpAction));
211
212        return pnl;
213    }
214
215    /**
216     * Constructs a new {@code CombinePrimitiveResolverDialog}.
217     * @param parent The parent component in which this dialog will be displayed.
218     */
219    public CombinePrimitiveResolverDialog(Component parent) {
220        super(JOptionPane.getFrameForComponent(parent), ModalityType.DOCUMENT_MODAL);
221        build();
222    }
223
224    /**
225     * Replies the tag conflict resolver model.
226     * @return The tag conflict resolver model.
227     */
228    public TagConflictResolverModel getTagConflictResolverModel() {
229        return pnlTagConflictResolver.getModel();
230    }
231
232    /**
233     * Replies the relation membership conflict resolver model.
234     * @return The relation membership conflict resolver model.
235     */
236    public RelationMemberConflictResolverModel getRelationMemberConflictResolverModel() {
237        return pnlRelationMemberConflictResolver.getModel();
238    }
239
240    /**
241     * Replies true if all tag and relation member conflicts have been decided.
242     *
243     * @return true if all tag and relation member conflicts have been decided; false otherwise
244     */
245    public boolean isResolvedCompletely() {
246        return getTagConflictResolverModel().isResolvedCompletely()
247                && getRelationMemberConflictResolverModel().isResolvedCompletely();
248    }
249
250    protected List<Command> buildTagChangeCommand(OsmPrimitive primitive, TagCollection tc) {
251        List<Command> cmds = new LinkedList<>();
252        for (String key : tc.getKeys()) {
253            if (tc.hasUniqueEmptyValue(key)) {
254                if (primitive.get(key) != null) {
255                    cmds.add(new ChangePropertyCommand(primitive, key, null));
256                }
257            } else {
258                String value = tc.getJoinedValues(key);
259                if (!value.equals(primitive.get(key))) {
260                    cmds.add(new ChangePropertyCommand(primitive, key, value));
261                }
262            }
263        }
264        return cmds;
265    }
266
267    /**
268     * Replies the list of {@link Command commands} needed to apply resolution choices.
269     * @return The list of {@link Command commands} needed to apply resolution choices.
270     */
271    public List<Command> buildResolutionCommands() {
272        List<Command> cmds = new LinkedList<>();
273
274        TagCollection allResolutions = getTagConflictResolverModel().getAllResolutions();
275        if (!allResolutions.isEmpty()) {
276            cmds.addAll(buildTagChangeCommand(targetPrimitive, allResolutions));
277        }
278        for (String p : OsmPrimitive.getDiscardableKeys()) {
279            if (targetPrimitive.get(p) != null) {
280                cmds.add(new ChangePropertyCommand(targetPrimitive, p, null));
281            }
282        }
283
284        if (getRelationMemberConflictResolverModel().getNumDecisions() > 0) {
285            cmds.addAll(getRelationMemberConflictResolverModel().buildResolutionCommands(targetPrimitive));
286        }
287
288        Command cmd = pnlRelationMemberConflictResolver.buildTagApplyCommands(getRelationMemberConflictResolverModel()
289                .getModifiedRelations(targetPrimitive));
290        if (cmd != null) {
291            cmds.add(cmd);
292        }
293        return cmds;
294    }
295
296    /**
297     * Prepares the default decisions for populated tag and relation membership conflicts.
298     */
299    public void prepareDefaultDecisions() {
300        getTagConflictResolverModel().prepareDefaultTagDecisions();
301        getRelationMemberConflictResolverModel().prepareDefaultRelationDecisions();
302    }
303
304    protected JPanel buildEmptyConflictsPanel() {
305        JPanel pnl = new JPanel(new BorderLayout());
306        pnl.add(new JLabel(tr("No conflicts to resolve")));
307        return pnl;
308    }
309
310    protected void prepareGUIBeforeConflictResolutionStarts() {
311        RelationMemberConflictResolverModel relModel = getRelationMemberConflictResolverModel();
312        TagConflictResolverModel tagModel = getTagConflictResolverModel();
313        getContentPane().removeAll();
314
315        if (relModel.getNumDecisions() > 0 && tagModel.getNumDecisions() > 0) {
316            // display both, the dialog for resolving relation conflicts and for resolving tag conflicts
317            spTagConflictTypes.setTopComponent(pnlTagConflictResolver);
318            spTagConflictTypes.setBottomComponent(pnlRelationMemberConflictResolver);
319            getContentPane().add(spTagConflictTypes, BorderLayout.CENTER);
320        } else if (relModel.getNumDecisions() > 0) {
321            // relation conflicts only
322            getContentPane().add(pnlRelationMemberConflictResolver, BorderLayout.CENTER);
323        } else if (tagModel.getNumDecisions() > 0) {
324            // tag conflicts only
325            getContentPane().add(pnlTagConflictResolver, BorderLayout.CENTER);
326        } else {
327            getContentPane().add(buildEmptyConflictsPanel(), BorderLayout.CENTER);
328        }
329
330        getContentPane().add(pnlButtons, BorderLayout.SOUTH);
331        validate();
332        adjustDividerLocation();
333        pnlRelationMemberConflictResolver.prepareForEditing();
334    }
335
336    protected void setApplied(boolean applied) {
337        this.applied = applied;
338    }
339
340    /**
341     * Determines if this dialog has been closed with "Apply".
342     * @return true if this dialog has been closed with "Apply", false otherwise.
343     */
344    public boolean isApplied() {
345        return applied;
346    }
347
348    @Override
349    public void setVisible(boolean visible) {
350        if (visible) {
351            prepareGUIBeforeConflictResolutionStarts();
352            setMinimumSize(new Dimension(400, 400));
353            new WindowGeometry(getClass().getName() + ".geometry", WindowGeometry.centerInWindow(Main.parent,
354                    new Dimension(800, 600))).applySafe(this);
355            setApplied(false);
356            btnApply.requestFocusInWindow();
357        } else if (isShowing()) { // Avoid IllegalComponentStateException like in #8775
358            new WindowGeometry(this).remember(getClass().getName() + ".geometry");
359        }
360        super.setVisible(visible);
361    }
362
363    class CancelAction extends AbstractAction {
364
365        CancelAction() {
366            putValue(Action.SHORT_DESCRIPTION, tr("Cancel conflict resolution"));
367            putValue(Action.NAME, tr("Cancel"));
368            putValue(Action.SMALL_ICON, ImageProvider.get("", "cancel"));
369            setEnabled(true);
370        }
371
372        @Override
373        public void actionPerformed(ActionEvent arg0) {
374            setVisible(false);
375        }
376    }
377
378    protected class ApplyAction extends AbstractAction implements PropertyChangeListener {
379
380        public ApplyAction() {
381            putValue(Action.SHORT_DESCRIPTION, tr("Apply resolved conflicts"));
382            putValue(Action.NAME, tr("Apply"));
383            putValue(Action.SMALL_ICON, ImageProvider.get("ok"));
384            updateEnabledState();
385        }
386
387        @Override
388        public void actionPerformed(ActionEvent arg0) {
389            setApplied(true);
390            setVisible(false);
391            pnlTagConflictResolver.rememberPreferences();
392        }
393
394        protected final void updateEnabledState() {
395            setEnabled(pnlTagConflictResolver.getModel().getNumConflicts() == 0
396                    && pnlRelationMemberConflictResolver.getModel().getNumConflicts() == 0);
397        }
398
399        @Override
400        public void propertyChange(PropertyChangeEvent evt) {
401            if (evt.getPropertyName().equals(TagConflictResolverModel.NUM_CONFLICTS_PROP)) {
402                updateEnabledState();
403            }
404            if (evt.getPropertyName().equals(RelationMemberConflictResolverModel.NUM_CONFLICTS_PROP)) {
405                updateEnabledState();
406            }
407        }
408    }
409
410    private void adjustDividerLocation() {
411        int numTagDecisions = getTagConflictResolverModel().getNumDecisions();
412        int numRelationDecisions = getRelationMemberConflictResolverModel().getNumDecisions();
413        if (numTagDecisions > 0 && numRelationDecisions > 0) {
414            double nTop = 1.0 + numTagDecisions;
415            double nBottom = 2.5 + numRelationDecisions;
416            spTagConflictTypes.setDividerLocation(nTop/(nTop+nBottom));
417        }
418    }
419
420    class AdjustDividerLocationAction extends WindowAdapter {
421        @Override
422        public void windowOpened(WindowEvent e) {
423            adjustDividerLocation();
424        }
425    }
426
427    static class AutoAdjustingSplitPane extends JSplitPane implements PropertyChangeListener, HierarchyBoundsListener {
428        private double dividerLocation;
429
430        AutoAdjustingSplitPane(int newOrientation) {
431            super(newOrientation);
432            addPropertyChangeListener(JSplitPane.DIVIDER_LOCATION_PROPERTY, this);
433            addHierarchyBoundsListener(this);
434        }
435
436        @Override
437        public void ancestorResized(HierarchyEvent e) {
438            setDividerLocation((int) (dividerLocation * getHeight()));
439        }
440
441        @Override
442        public void ancestorMoved(HierarchyEvent e) {
443            // do nothing
444        }
445
446        @Override
447        public void propertyChange(PropertyChangeEvent evt) {
448            if (JSplitPane.DIVIDER_LOCATION_PROPERTY.equals(evt.getPropertyName())) {
449                int newVal = (Integer) evt.getNewValue();
450                if (getHeight() != 0) {
451                    dividerLocation = (double) newVal / (double) getHeight();
452                }
453            }
454        }
455    }
456
457    /**
458     * Replies the list of {@link Command commands} needed to resolve specified conflicts,
459     * by displaying if necessary a {@link CombinePrimitiveResolverDialog} to the user.
460     * This dialog will allow the user to choose conflict resolution actions.
461     *
462     * Non-expert users are informed first of the meaning of these operations, allowing them to cancel.
463     *
464     * @param tagsOfPrimitives The tag collection of the primitives to be combined.
465     *                         Should generally be equal to {@code TagCollection.unionOfAllPrimitives(primitives)}
466     * @param primitives The primitives to be combined
467     * @param targetPrimitives The primitives the collection of primitives are merged or combined to.
468     * @return The list of {@link Command commands} needed to apply resolution actions.
469     * @throws UserCancelException If the user cancelled a dialog.
470     */
471    public static List<Command> launchIfNecessary(
472            final TagCollection tagsOfPrimitives,
473            final Collection<? extends OsmPrimitive> primitives,
474            final Collection<? extends OsmPrimitive> targetPrimitives) throws UserCancelException {
475
476        CheckParameterUtil.ensureParameterNotNull(tagsOfPrimitives, "tagsOfPrimitives");
477        CheckParameterUtil.ensureParameterNotNull(primitives, "primitives");
478        CheckParameterUtil.ensureParameterNotNull(targetPrimitives, "targetPrimitives");
479
480        final TagCollection completeWayTags = new TagCollection(tagsOfPrimitives);
481        TagConflictResolutionUtil.combineTigerTags(completeWayTags);
482        TagConflictResolutionUtil.normalizeTagCollectionBeforeEditing(completeWayTags, primitives);
483        final TagCollection tagsToEdit = new TagCollection(completeWayTags);
484        TagConflictResolutionUtil.completeTagCollectionForEditing(tagsToEdit);
485
486        final Set<Relation> parentRelations = OsmPrimitive.getParentRelations(primitives);
487
488        // Show information dialogs about conflicts to non-experts
489        if (!ExpertToggleAction.isExpert()) {
490            // Tag conflicts
491            if (!completeWayTags.isApplicableToPrimitive()) {
492                informAboutTagConflicts(primitives, completeWayTags);
493            }
494            // Relation membership conflicts
495            if (!parentRelations.isEmpty()) {
496                informAboutRelationMembershipConflicts(primitives, parentRelations);
497            }
498        }
499
500        List<Command> cmds = new LinkedList<>();
501
502        if (!GraphicsEnvironment.isHeadless()) {
503            // Build conflict resolution dialog
504            final CombinePrimitiveResolverDialog dialog = CombinePrimitiveResolverDialog.getInstance();
505
506            dialog.getTagConflictResolverModel().populate(tagsToEdit, completeWayTags.getKeysWithMultipleValues());
507            dialog.getRelationMemberConflictResolverModel().populate(parentRelations, primitives);
508            dialog.prepareDefaultDecisions();
509
510            // Ensure a proper title is displayed instead of a previous target (fix #7925)
511            if (targetPrimitives.size() == 1) {
512                dialog.setTargetPrimitive(targetPrimitives.iterator().next());
513            } else {
514                dialog.setTargetPrimitive(null);
515            }
516
517            // Resolve tag conflicts if necessary
518            if (!dialog.isResolvedCompletely()) {
519                dialog.setVisible(true);
520                if (!dialog.isApplied()) {
521                    throw new UserCancelException();
522                }
523            }
524            for (OsmPrimitive i : targetPrimitives) {
525                dialog.setTargetPrimitive(i);
526                cmds.addAll(dialog.buildResolutionCommands());
527            }
528        }
529        return cmds;
530    }
531
532    /**
533     * Inform a non-expert user about what relation membership conflict resolution means.
534     * @param primitives The primitives to be combined
535     * @param parentRelations The parent relations of the primitives
536     * @throws UserCancelException If the user cancels the dialog.
537     */
538    protected static void informAboutRelationMembershipConflicts(
539            final Collection<? extends OsmPrimitive> primitives,
540            final Set<Relation> parentRelations) throws UserCancelException {
541        /* I18n: object count < 2 is not possible */
542        String msg = trn("You are about to combine {1} object, "
543                + "which is part of {0} relation:<br/>{2}"
544                + "Combining these objects may break this relation. If you are unsure, please cancel this operation.<br/>"
545                + "If you want to continue, you are shown a dialog to decide how to adapt the relation.<br/><br/>"
546                + "Do you want to continue?",
547                "You are about to combine {1} objects, "
548                + "which are part of {0} relations:<br/>{2}"
549                + "Combining these objects may break these relations. If you are unsure, please cancel this operation.<br/>"
550                + "If you want to continue, you are shown a dialog to decide how to adapt the relations.<br/><br/>"
551                + "Do you want to continue?",
552                parentRelations.size(), parentRelations.size(), primitives.size(),
553                DefaultNameFormatter.getInstance().formatAsHtmlUnorderedList(parentRelations, 20));
554
555        if (!ConditionalOptionPaneUtil.showConfirmationDialog(
556                "combine_tags",
557                Main.parent,
558                "<html>" + msg + "</html>",
559                tr("Combine confirmation"),
560                JOptionPane.YES_NO_OPTION,
561                JOptionPane.QUESTION_MESSAGE,
562                JOptionPane.YES_OPTION)) {
563            throw new UserCancelException();
564        }
565    }
566
567    /**
568     * Inform a non-expert user about what tag conflict resolution means.
569     * @param primitives The primitives to be combined
570     * @param normalizedTags The normalized tag collection of the primitives to be combined
571     * @throws UserCancelException If the user cancels the dialog.
572     */
573    protected static void informAboutTagConflicts(
574            final Collection<? extends OsmPrimitive> primitives,
575            final TagCollection normalizedTags) throws UserCancelException {
576        String conflicts = Utils.joinAsHtmlUnorderedList(Utils.transform(normalizedTags.getKeysWithMultipleValues(),
577                new Function<String, String>() {
578            @Override
579            public String apply(String key) {
580                return tr("{0} ({1})", key, Utils.join(tr(", "), Utils.transform(normalizedTags.getValues(key),
581                        new Function<String, String>() {
582                    @Override
583                    public String apply(String x) {
584                        return x == null || x.isEmpty() ? tr("<i>missing</i>") : x;
585                    }
586                })));
587            }
588        }));
589        String msg = /* for correct i18n of plural forms - see #9110 */ trn("You are about to combine {0} objects, "
590                + "but the following tags are used conflictingly:<br/>{1}"
591                + "If these objects are combined, the resulting object may have unwanted tags.<br/>"
592                + "If you want to continue, you are shown a dialog to fix the conflicting tags.<br/><br/>"
593                + "Do you want to continue?", "You are about to combine {0} objects, "
594                + "but the following tags are used conflictingly:<br/>{1}"
595                + "If these objects are combined, the resulting object may have unwanted tags.<br/>"
596                + "If you want to continue, you are shown a dialog to fix the conflicting tags.<br/><br/>"
597                + "Do you want to continue?",
598                primitives.size(), primitives.size(), conflicts);
599
600        if (!ConditionalOptionPaneUtil.showConfirmationDialog(
601                "combine_tags",
602                Main.parent,
603                "<html>" + msg + "</html>",
604                tr("Combine confirmation"),
605                JOptionPane.YES_NO_OPTION,
606                JOptionPane.QUESTION_MESSAGE,
607                JOptionPane.YES_OPTION)) {
608            throw new UserCancelException();
609        }
610    }
611}