001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm;
003
004import static org.openstreetmap.josm.tools.I18n.tr;
005
006import java.awt.BorderLayout;
007import java.awt.Component;
008import java.awt.GridBagConstraints;
009import java.awt.GridBagLayout;
010import java.awt.Window;
011import java.awt.event.ComponentEvent;
012import java.awt.event.ComponentListener;
013import java.awt.event.KeyEvent;
014import java.awt.event.WindowAdapter;
015import java.awt.event.WindowEvent;
016import java.io.File;
017import java.lang.ref.WeakReference;
018import java.net.URI;
019import java.net.URISyntaxException;
020import java.net.URL;
021import java.text.MessageFormat;
022import java.util.ArrayList;
023import java.util.Arrays;
024import java.util.Collection;
025import java.util.Collections;
026import java.util.HashMap;
027import java.util.HashSet;
028import java.util.Iterator;
029import java.util.List;
030import java.util.Locale;
031import java.util.Map;
032import java.util.Objects;
033import java.util.Set;
034import java.util.StringTokenizer;
035import java.util.concurrent.Callable;
036import java.util.concurrent.ExecutorService;
037import java.util.concurrent.Executors;
038import java.util.concurrent.Future;
039import java.util.logging.Handler;
040import java.util.logging.Level;
041import java.util.logging.LogRecord;
042import java.util.logging.Logger;
043
044import javax.swing.Action;
045import javax.swing.InputMap;
046import javax.swing.JComponent;
047import javax.swing.JFrame;
048import javax.swing.JOptionPane;
049import javax.swing.JPanel;
050import javax.swing.JTextArea;
051import javax.swing.KeyStroke;
052import javax.swing.LookAndFeel;
053import javax.swing.UIManager;
054import javax.swing.UnsupportedLookAndFeelException;
055
056import org.openstreetmap.gui.jmapviewer.FeatureAdapter;
057import org.openstreetmap.josm.actions.JosmAction;
058import org.openstreetmap.josm.actions.OpenFileAction;
059import org.openstreetmap.josm.actions.OpenLocationAction;
060import org.openstreetmap.josm.actions.downloadtasks.DownloadGpsTask;
061import org.openstreetmap.josm.actions.downloadtasks.DownloadOsmTask;
062import org.openstreetmap.josm.actions.downloadtasks.DownloadTask;
063import org.openstreetmap.josm.actions.downloadtasks.PostDownloadHandler;
064import org.openstreetmap.josm.actions.mapmode.DrawAction;
065import org.openstreetmap.josm.actions.mapmode.MapMode;
066import org.openstreetmap.josm.actions.search.SearchAction;
067import org.openstreetmap.josm.data.Bounds;
068import org.openstreetmap.josm.data.Preferences;
069import org.openstreetmap.josm.data.ProjectionBounds;
070import org.openstreetmap.josm.data.UndoRedoHandler;
071import org.openstreetmap.josm.data.ViewportData;
072import org.openstreetmap.josm.data.cache.JCSCacheManager;
073import org.openstreetmap.josm.data.coor.CoordinateFormat;
074import org.openstreetmap.josm.data.coor.LatLon;
075import org.openstreetmap.josm.data.osm.DataSet;
076import org.openstreetmap.josm.data.osm.OsmPrimitive;
077import org.openstreetmap.josm.data.osm.PrimitiveDeepCopy;
078import org.openstreetmap.josm.data.osm.visitor.BoundingXYVisitor;
079import org.openstreetmap.josm.data.projection.Projection;
080import org.openstreetmap.josm.data.projection.ProjectionChangeListener;
081import org.openstreetmap.josm.data.validation.OsmValidator;
082import org.openstreetmap.josm.gui.GettingStarted;
083import org.openstreetmap.josm.gui.MainApplication.Option;
084import org.openstreetmap.josm.gui.MainMenu;
085import org.openstreetmap.josm.gui.MapFrame;
086import org.openstreetmap.josm.gui.MapFrameListener;
087import org.openstreetmap.josm.gui.MapView;
088import org.openstreetmap.josm.gui.dialogs.LayerListDialog;
089import org.openstreetmap.josm.gui.help.HelpUtil;
090import org.openstreetmap.josm.gui.io.SaveLayersDialog;
091import org.openstreetmap.josm.gui.layer.AbstractModifiableLayer;
092import org.openstreetmap.josm.gui.layer.Layer;
093import org.openstreetmap.josm.gui.layer.OsmDataLayer;
094import org.openstreetmap.josm.gui.layer.OsmDataLayer.CommandQueueListener;
095import org.openstreetmap.josm.gui.preferences.ToolbarPreferences;
096import org.openstreetmap.josm.gui.preferences.imagery.ImageryPreference;
097import org.openstreetmap.josm.gui.preferences.map.MapPaintPreference;
098import org.openstreetmap.josm.gui.preferences.projection.ProjectionPreference;
099import org.openstreetmap.josm.gui.progress.PleaseWaitProgressMonitor;
100import org.openstreetmap.josm.gui.progress.ProgressMonitorExecutor;
101import org.openstreetmap.josm.gui.tagging.presets.TaggingPresets;
102import org.openstreetmap.josm.gui.util.RedirectInputMap;
103import org.openstreetmap.josm.gui.widgets.JMultilineLabel;
104import org.openstreetmap.josm.io.FileWatcher;
105import org.openstreetmap.josm.io.OnlineResource;
106import org.openstreetmap.josm.io.OsmApi;
107import org.openstreetmap.josm.plugins.PluginHandler;
108import org.openstreetmap.josm.tools.CheckParameterUtil;
109import org.openstreetmap.josm.tools.I18n;
110import org.openstreetmap.josm.tools.ImageProvider;
111import org.openstreetmap.josm.tools.OpenBrowser;
112import org.openstreetmap.josm.tools.OsmUrlToBounds;
113import org.openstreetmap.josm.tools.PlatformHook;
114import org.openstreetmap.josm.tools.PlatformHookOsx;
115import org.openstreetmap.josm.tools.PlatformHookUnixoid;
116import org.openstreetmap.josm.tools.PlatformHookWindows;
117import org.openstreetmap.josm.tools.Shortcut;
118import org.openstreetmap.josm.tools.Utils;
119import org.openstreetmap.josm.tools.WindowGeometry;
120
121/**
122 * Abstract class holding various static global variables and methods used in large parts of JOSM application.
123 * @since 98
124 */
125public abstract class Main {
126
127    /**
128     * The JOSM website URL.
129     * @since 6897 (was public from 6143 to 6896)
130     */
131    private static final String JOSM_WEBSITE = "https://josm.openstreetmap.de";
132
133    /**
134     * The OSM website URL.
135     * @since 6897 (was public from 6453 to 6896)
136     */
137    private static final String OSM_WEBSITE = "https://www.openstreetmap.org";
138
139    /**
140     * Replies true if JOSM currently displays a map view. False, if it doesn't, i.e. if
141     * it only shows the MOTD panel.
142     *
143     * @return <code>true</code> if JOSM currently displays a map view
144     */
145    public static boolean isDisplayingMapView() {
146        if (map == null) return false;
147        if (map.mapView == null) return false;
148        return true;
149    }
150
151    /**
152     * Global parent component for all dialogs and message boxes
153     */
154    public static Component parent;
155
156    /**
157     * Global application.
158     */
159    public static volatile Main main;
160
161    /**
162     * Command-line arguments used to run the application.
163     */
164    protected static final List<String> COMMAND_LINE_ARGS = new ArrayList<>();
165
166    /**
167     * The worker thread slave. This is for executing all long and intensive
168     * calculations. The executed runnables are guaranteed to be executed separately
169     * and sequential.
170     */
171    public static final ExecutorService worker = new ProgressMonitorExecutor("main-worker-%d", Thread.NORM_PRIORITY);
172
173    /**
174     * Global application preferences
175     */
176    public static Preferences pref;
177
178    /**
179     * The global paste buffer.
180     */
181    public static final PrimitiveDeepCopy pasteBuffer = new PrimitiveDeepCopy();
182
183    /**
184     * The layer source from which {@link Main#pasteBuffer} data comes from.
185     */
186    public static Layer pasteSource;
187
188    /**
189     * The MapFrame. Use {@link Main#setMapFrame} to set or clear it.
190     */
191    public static MapFrame map;
192
193    /**
194     * The toolbar preference control to register new actions.
195     */
196    public static volatile ToolbarPreferences toolbar;
197
198    /**
199     * The commands undo/redo handler.
200     */
201    public final UndoRedoHandler undoRedo = new UndoRedoHandler();
202
203    /**
204     * The progress monitor being currently displayed.
205     */
206    public static PleaseWaitProgressMonitor currentProgressMonitor;
207
208    /**
209     * The main menu bar at top of screen.
210     */
211    public MainMenu menu;
212
213    /**
214     * The data validation handler.
215     */
216    public OsmValidator validator;
217
218    /**
219     * The file watcher service.
220     */
221    public static final FileWatcher fileWatcher = new FileWatcher();
222
223    /**
224     * The MOTD Layer.
225     */
226    public final GettingStarted gettingStarted = new GettingStarted();
227
228    private static final Collection<MapFrameListener> mapFrameListeners = new ArrayList<>();
229
230    protected static final Map<String, Throwable> NETWORK_ERRORS = new HashMap<>();
231
232    // First lines of last 5 error and warning messages, used for bug reports
233    private static final List<String> ERRORS_AND_WARNINGS = Collections.<String>synchronizedList(new ArrayList<String>());
234
235    private static final Set<OnlineResource> OFFLINE_RESOURCES = new HashSet<>();
236
237    /**
238     * Logging level (5 = trace, 4 = debug, 3 = info, 2 = warn, 1 = error, 0 = none).
239     * @since 6248
240     */
241    public static int logLevel = 3;
242
243    private static void rememberWarnErrorMsg(String msg) {
244        // Only remember first line of message
245        int idx = msg.indexOf('\n');
246        if (idx > 0) {
247            ERRORS_AND_WARNINGS.add(msg.substring(0, idx));
248        } else {
249            ERRORS_AND_WARNINGS.add(msg);
250        }
251        // Only keep 5 lines to avoid memory leak and incomplete stacktraces in bug reports
252        while (ERRORS_AND_WARNINGS.size() > 5) {
253            ERRORS_AND_WARNINGS.remove(0);
254        }
255    }
256
257    /**
258     * Replies the first lines of last 5 error and warning messages, used for bug reports
259     * @return the first lines of last 5 error and warning messages
260     * @since 7420
261     */
262    public static final Collection<String> getLastErrorAndWarnings() {
263        return Collections.unmodifiableList(ERRORS_AND_WARNINGS);
264    }
265
266    /**
267     * Clears the list of last error and warning messages.
268     * @since 8959
269     */
270    public static void clearLastErrorAndWarnings() {
271        ERRORS_AND_WARNINGS.clear();
272    }
273
274    /**
275     * Prints an error message if logging is on.
276     * @param msg The message to print.
277     * @since 6248
278     */
279    public static void error(String msg) {
280        if (logLevel < 1)
281            return;
282        if (msg != null && !msg.isEmpty()) {
283            System.err.println(tr("ERROR: {0}", msg));
284            rememberWarnErrorMsg("E: "+msg);
285        }
286    }
287
288    /**
289     * Prints a warning message if logging is on.
290     * @param msg The message to print.
291     */
292    public static void warn(String msg) {
293        if (logLevel < 2)
294            return;
295        if (msg != null && !msg.isEmpty()) {
296            System.err.println(tr("WARNING: {0}", msg));
297            rememberWarnErrorMsg("W: "+msg);
298        }
299    }
300
301    /**
302     * Prints an informational message if logging is on.
303     * @param msg The message to print.
304     */
305    public static void info(String msg) {
306        if (logLevel < 3)
307            return;
308        if (msg != null && !msg.isEmpty()) {
309            System.out.println(tr("INFO: {0}", msg));
310        }
311    }
312
313    /**
314     * Prints a debug message if logging is on.
315     * @param msg The message to print.
316     */
317    public static void debug(String msg) {
318        if (logLevel < 4)
319            return;
320        if (msg != null && !msg.isEmpty()) {
321            System.out.println(tr("DEBUG: {0}", msg));
322        }
323    }
324
325    /**
326     * Prints a trace message if logging is on.
327     * @param msg The message to print.
328     */
329    public static void trace(String msg) {
330        if (logLevel < 5)
331            return;
332        if (msg != null && !msg.isEmpty()) {
333            System.out.print("TRACE: ");
334            System.out.println(msg);
335        }
336    }
337
338    /**
339     * Determines if debug log level is enabled.
340     * Useful to avoid costly construction of debug messages when not enabled.
341     * @return {@code true} if log level is at least debug, {@code false} otherwise
342     * @since 6852
343     */
344    public static boolean isDebugEnabled() {
345        return logLevel >= 4;
346    }
347
348    /**
349     * Determines if trace log level is enabled.
350     * Useful to avoid costly construction of trace messages when not enabled.
351     * @return {@code true} if log level is at least trace, {@code false} otherwise
352     * @since 6852
353     */
354    public static boolean isTraceEnabled() {
355        return logLevel >= 5;
356    }
357
358    /**
359     * Prints a formatted error message if logging is on. Calls {@link MessageFormat#format}
360     * function to format text.
361     * @param msg The formatted message to print.
362     * @param objects The objects to insert into format string.
363     * @since 6248
364     */
365    public static void error(String msg, Object... objects) {
366        error(MessageFormat.format(msg, objects));
367    }
368
369    /**
370     * Prints a formatted warning message if logging is on. Calls {@link MessageFormat#format}
371     * function to format text.
372     * @param msg The formatted message to print.
373     * @param objects The objects to insert into format string.
374     */
375    public static void warn(String msg, Object... objects) {
376        warn(MessageFormat.format(msg, objects));
377    }
378
379    /**
380     * Prints a formatted informational message if logging is on. Calls {@link MessageFormat#format}
381     * function to format text.
382     * @param msg The formatted message to print.
383     * @param objects The objects to insert into format string.
384     */
385    public static void info(String msg, Object... objects) {
386        info(MessageFormat.format(msg, objects));
387    }
388
389    /**
390     * Prints a formatted debug message if logging is on. Calls {@link MessageFormat#format}
391     * function to format text.
392     * @param msg The formatted message to print.
393     * @param objects The objects to insert into format string.
394     */
395    public static void debug(String msg, Object... objects) {
396        debug(MessageFormat.format(msg, objects));
397    }
398
399    /**
400     * Prints a formatted trace message if logging is on. Calls {@link MessageFormat#format}
401     * function to format text.
402     * @param msg The formatted message to print.
403     * @param objects The objects to insert into format string.
404     */
405    public static void trace(String msg, Object... objects) {
406        trace(MessageFormat.format(msg, objects));
407    }
408
409    /**
410     * Prints an error message for the given Throwable.
411     * @param t The throwable object causing the error
412     * @since 6248
413     */
414    public static void error(Throwable t) {
415        error(t, true);
416    }
417
418    /**
419     * Prints a warning message for the given Throwable.
420     * @param t The throwable object causing the error
421     * @since 6248
422     */
423    public static void warn(Throwable t) {
424        warn(t, true);
425    }
426
427    /**
428     * Prints an error message for the given Throwable.
429     * @param t The throwable object causing the error
430     * @param stackTrace {@code true}, if the stacktrace should be displayed
431     * @since 6642
432     */
433    public static void error(Throwable t, boolean stackTrace) {
434        error(getErrorMessage(t));
435        if (stackTrace) {
436            t.printStackTrace();
437        }
438    }
439
440    /**
441     * Prints a warning message for the given Throwable.
442     * @param t The throwable object causing the error
443     * @param stackTrace {@code true}, if the stacktrace should be displayed
444     * @since 6642
445     */
446    public static void warn(Throwable t, boolean stackTrace) {
447        warn(getErrorMessage(t));
448        if (stackTrace) {
449            t.printStackTrace();
450        }
451    }
452
453    /**
454     * Returns a human-readable message of error, also usable for developers.
455     * @param t The error
456     * @return The human-readable error message
457     * @since 6642
458     */
459    public static String getErrorMessage(Throwable t) {
460        if (t == null) {
461            return null;
462        }
463        StringBuilder sb = new StringBuilder(t.getClass().getName());
464        String msg = t.getMessage();
465        if (msg != null) {
466            sb.append(": ").append(msg.trim());
467        }
468        Throwable cause = t.getCause();
469        if (cause != null && !cause.equals(t)) {
470            sb.append(". ").append(tr("Cause: ")).append(getErrorMessage(cause));
471        }
472        return sb.toString();
473    }
474
475    /**
476     * Platform specific code goes in here.
477     * Plugins may replace it, however, some hooks will be called before any plugins have been loeaded.
478     * So if you need to hook into those early ones, split your class and send the one with the early hooks
479     * to the JOSM team for inclusion.
480     */
481    public static volatile PlatformHook platform;
482
483    /**
484     * Whether or not the java vm is openjdk
485     * We use this to work around openjdk bugs
486     */
487    public static boolean isOpenjdk;
488
489    /**
490     * Initializes {@code Main.pref} in normal application context.
491     * @since 6471
492     */
493    public static void initApplicationPreferences() {
494        Main.pref = new Preferences();
495    }
496
497    /**
498     * Set or clear (if passed <code>null</code>) the map.
499     * @param map The map to set {@link Main#map} to. Can be null.
500     */
501    public final void setMapFrame(final MapFrame map) {
502        MapFrame old = Main.map;
503        panel.setVisible(false);
504        panel.removeAll();
505        if (map != null) {
506            map.fillPanel(panel);
507        } else {
508            old.destroy();
509            panel.add(gettingStarted, BorderLayout.CENTER);
510        }
511        panel.setVisible(true);
512        redoUndoListener.commandChanged(0, 0);
513
514        Main.map = map;
515
516        for (MapFrameListener listener : mapFrameListeners) {
517            listener.mapFrameInitialized(old, map);
518        }
519        if (map == null && currentProgressMonitor != null) {
520            currentProgressMonitor.showForegroundDialog();
521        }
522    }
523
524    /**
525     * Remove the specified layer from the map. If it is the last layer,
526     * remove the map as well.
527     * @param layer The layer to remove
528     */
529    public final synchronized void removeLayer(final Layer layer) {
530        if (map != null) {
531            map.mapView.removeLayer(layer);
532            if (isDisplayingMapView() && map.mapView.getAllLayers().isEmpty()) {
533                setMapFrame(null);
534            }
535        }
536    }
537
538    private static volatile InitStatusListener initListener;
539
540    public interface InitStatusListener {
541
542        Object updateStatus(String event);
543
544        void finish(Object status);
545    }
546
547    public static void setInitStatusListener(InitStatusListener listener) {
548        CheckParameterUtil.ensureParameterNotNull(listener);
549        initListener = listener;
550    }
551
552    /**
553     * Constructs new {@code Main} object. A lot of global variables are initialized here.
554     */
555    public Main() {
556        main = this;
557        isOpenjdk = System.getProperty("java.vm.name").toUpperCase(Locale.ENGLISH).indexOf("OPENJDK") != -1;
558
559        new InitializationTask(tr("Executing platform startup hook")) {
560            @Override
561            public void initialize() {
562                platform.startupHook();
563            }
564        }.call();
565
566        new InitializationTask(tr("Building main menu")) {
567
568            @Override
569            public void initialize() {
570                contentPanePrivate.add(panel, BorderLayout.CENTER);
571                panel.add(gettingStarted, BorderLayout.CENTER);
572                menu = new MainMenu();
573            }
574        }.call();
575
576        undoRedo.addCommandQueueListener(redoUndoListener);
577
578        // creating toolbar
579        contentPanePrivate.add(toolbar.control, BorderLayout.NORTH);
580
581        registerActionShortcut(menu.help, Shortcut.registerShortcut("system:help", tr("Help"),
582                KeyEvent.VK_F1, Shortcut.DIRECT));
583
584        // contains several initialization tasks to be executed (in parallel) by a ExecutorService
585        List<Callable<Void>> tasks = new ArrayList<>();
586
587        tasks.add(new InitializationTask(tr("Initializing OSM API")) {
588
589            @Override
590            public void initialize() {
591                // We try to establish an API connection early, so that any API
592                // capabilities are already known to the editor instance. However
593                // if it goes wrong that's not critical at this stage.
594                try {
595                    OsmApi.getOsmApi().initialize(null, true);
596                } catch (Exception e) {
597                    Main.warn(getErrorMessage(Utils.getRootCause(e)));
598                }
599            }
600        });
601
602        tasks.add(new InitializationTask(tr("Initializing validator")) {
603
604            @Override
605            public void initialize() {
606                validator = new OsmValidator();
607                MapView.addLayerChangeListener(validator);
608            }
609        });
610
611        tasks.add(new InitializationTask(tr("Initializing presets")) {
612
613            @Override
614            public void initialize() {
615                TaggingPresets.initialize();
616            }
617        });
618
619        tasks.add(new InitializationTask(tr("Initializing map styles")) {
620
621            @Override
622            public void initialize() {
623                MapPaintPreference.initialize();
624            }
625        });
626
627        tasks.add(new InitializationTask(tr("Loading imagery preferences")) {
628
629            @Override
630            public void initialize() {
631                ImageryPreference.initialize();
632            }
633        });
634
635        try {
636            final ExecutorService service = Executors.newFixedThreadPool(
637                    Runtime.getRuntime().availableProcessors(), Utils.newThreadFactory("main-init-%d", Thread.NORM_PRIORITY));
638            for (Future<Void> i : service.invokeAll(tasks)) {
639                i.get();
640            }
641            service.shutdown();
642        } catch (Exception ex) {
643            throw new RuntimeException(ex);
644        }
645
646        // hooks for the jmapviewer component
647        FeatureAdapter.registerBrowserAdapter(new FeatureAdapter.BrowserAdapter() {
648            @Override
649            public void openLink(String url) {
650                OpenBrowser.displayUrl(url);
651            }
652        });
653        FeatureAdapter.registerTranslationAdapter(I18n.getTranslationAdapter());
654        FeatureAdapter.registerLoggingAdapter(new FeatureAdapter.LoggingAdapter() {
655            @Override
656            public Logger getLogger(String name) {
657                Logger logger = Logger.getAnonymousLogger();
658                logger.setUseParentHandlers(false);
659                logger.setLevel(Level.ALL);
660                if (logger.getHandlers().length == 0) {
661                    logger.addHandler(new Handler() {
662                        @Override
663                        public void publish(LogRecord record) {
664                            String msg = MessageFormat.format(record.getMessage(), record.getParameters());
665                            if (record.getLevel().intValue() >= Level.SEVERE.intValue()) {
666                                Main.error(msg);
667                            } else if (record.getLevel().intValue() >= Level.WARNING.intValue()) {
668                                Main.warn(msg);
669                            } else if (record.getLevel().intValue() >= Level.INFO.intValue()) {
670                                Main.info(msg);
671                            } else if (record.getLevel().intValue() >= Level.FINE.intValue()) {
672                                Main.debug(msg);
673                            } else {
674                                Main.trace(msg);
675                            }
676                        }
677
678                        @Override
679                        public void flush() {
680                        }
681
682                        @Override
683                        public void close() {
684                        }
685                    });
686                }
687                return logger;
688            }
689        });
690
691        new InitializationTask(tr("Updating user interface")) {
692
693            @Override
694            public void initialize() {
695                toolbar.refreshToolbarControl();
696                toolbar.control.updateUI();
697                contentPanePrivate.updateUI();
698            }
699        }.call();
700    }
701
702    private abstract class InitializationTask implements Callable<Void> {
703
704        private final String name;
705
706        protected InitializationTask(String name) {
707            this.name = name;
708        }
709
710        public abstract void initialize();
711
712        @Override
713        public Void call() {
714            Object status = null;
715            if (initListener != null) {
716                status = initListener.updateStatus(name);
717            }
718            initialize();
719            if (initListener != null) {
720                initListener.finish(status);
721            }
722            return null;
723        }
724    }
725
726    /**
727     * Add a new layer to the map.
728     *
729     * If no map exists, create one.
730     *
731     * @param layer the layer
732     *
733     * @see #addLayer(Layer, ProjectionBounds)
734     * @see #addLayer(Layer, ViewportData)
735     */
736    public final void addLayer(final Layer layer) {
737        BoundingXYVisitor v = new BoundingXYVisitor();
738        layer.visitBoundingBox(v);
739        addLayer(layer, v.getBounds());
740    }
741
742    /**
743     * Add a new layer to the map.
744     *
745     * If no map exists, create one.
746     *
747     * @param layer the layer
748     * @param bounds the bounds of the layer (target zoom area); can be null, then
749     * the viewport isn't changed
750     */
751    public final synchronized void addLayer(final Layer layer, ProjectionBounds bounds) {
752        addLayer(layer, bounds == null ? null : new ViewportData(bounds));
753    }
754
755    /**
756     * Add a new layer to the map.
757     *
758     * If no map exists, create one.
759     *
760     * @param layer the layer
761     * @param viewport the viewport to zoom to; can be null, then the viewport
762     * isn't changed
763     */
764    public final synchronized void addLayer(final Layer layer, ViewportData viewport) {
765        boolean noMap = map == null;
766        if (noMap) {
767            createMapFrame(layer, viewport);
768        }
769        layer.hookUpMapView();
770        map.mapView.addLayer(layer);
771        if (noMap) {
772            Main.map.setVisible(true);
773        } else if (viewport != null) {
774            Main.map.mapView.zoomTo(viewport);
775        }
776    }
777
778    public synchronized void createMapFrame(Layer firstLayer, ViewportData viewportData) {
779        MapFrame mapFrame = new MapFrame(contentPanePrivate, viewportData);
780        setMapFrame(mapFrame);
781        if (firstLayer != null) {
782            mapFrame.selectMapMode((MapMode) mapFrame.getDefaultButtonAction(), firstLayer);
783        }
784        mapFrame.initializeDialogsPane();
785        // bootstrapping problem: make sure the layer list dialog is going to
786        // listen to change events of the very first layer
787        //
788        if (firstLayer != null) {
789            firstLayer.addPropertyChangeListener(LayerListDialog.getInstance().getModel());
790        }
791    }
792
793    /**
794     * Replies <code>true</code> if there is an edit layer
795     *
796     * @return <code>true</code> if there is an edit layer
797     */
798    public boolean hasEditLayer() {
799        if (getEditLayer() == null) return false;
800        return true;
801    }
802
803    /**
804     * Replies the current edit layer
805     *
806     * @return the current edit layer. <code>null</code>, if no current edit layer exists
807     */
808    public OsmDataLayer getEditLayer() {
809        if (!isDisplayingMapView()) return null;
810        return map.mapView.getEditLayer();
811    }
812
813    /**
814     * Replies the current data set.
815     *
816     * @return the current data set. <code>null</code>, if no current data set exists
817     */
818    public DataSet getCurrentDataSet() {
819        if (!hasEditLayer()) return null;
820        return getEditLayer().data;
821    }
822
823    /**
824     * Replies the current selected primitives, from a end-user point of view.
825     * It is not always technically the same collection of primitives than {@link DataSet#getSelected()}.
826     * Indeed, if the user is currently in drawing mode, only the way currently being drawn is returned,
827     * see {@link DrawAction#getInProgressSelection()}.
828     *
829     * @return The current selected primitives, from a end-user point of view. Can be {@code null}.
830     * @since 6546
831     */
832    public Collection<OsmPrimitive> getInProgressSelection() {
833        if (map != null && map.mapMode instanceof DrawAction) {
834            return ((DrawAction) map.mapMode).getInProgressSelection();
835        } else {
836            DataSet ds = getCurrentDataSet();
837            if (ds == null) return null;
838            return ds.getSelected();
839        }
840    }
841
842    /**
843     * Returns the currently active  layer
844     *
845     * @return the currently active layer. <code>null</code>, if currently no active layer exists
846     */
847    public Layer getActiveLayer() {
848        if (!isDisplayingMapView()) return null;
849        return map.mapView.getActiveLayer();
850    }
851
852    protected static final JPanel contentPanePrivate = new JPanel(new BorderLayout());
853
854    public static void redirectToMainContentPane(JComponent source) {
855        RedirectInputMap.redirect(source, contentPanePrivate);
856    }
857
858    public static void registerActionShortcut(JosmAction action) {
859        registerActionShortcut(action, action.getShortcut());
860    }
861
862    public static void registerActionShortcut(Action action, Shortcut shortcut) {
863        KeyStroke keyStroke = shortcut.getKeyStroke();
864        if (keyStroke == null)
865            return;
866
867        InputMap inputMap = contentPanePrivate.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
868        Object existing = inputMap.get(keyStroke);
869        if (existing != null && !existing.equals(action)) {
870            info(String.format("Keystroke %s is already assigned to %s, will be overridden by %s", keyStroke, existing, action));
871        }
872        inputMap.put(keyStroke, action);
873
874        contentPanePrivate.getActionMap().put(action, action);
875    }
876
877    public static void unregisterShortcut(Shortcut shortcut) {
878        contentPanePrivate.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).remove(shortcut.getKeyStroke());
879    }
880
881    public static void unregisterActionShortcut(JosmAction action) {
882        unregisterActionShortcut(action, action.getShortcut());
883    }
884
885    public static void unregisterActionShortcut(Action action, Shortcut shortcut) {
886        unregisterShortcut(shortcut);
887        contentPanePrivate.getActionMap().remove(action);
888    }
889
890    /**
891     * Replies the registered action for the given shortcut
892     * @param shortcut The shortcut to look for
893     * @return the registered action for the given shortcut
894     * @since 5696
895     */
896    public static Action getRegisteredActionShortcut(Shortcut shortcut) {
897        KeyStroke keyStroke = shortcut.getKeyStroke();
898        if (keyStroke == null)
899            return null;
900        Object action = contentPanePrivate.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).get(keyStroke);
901        if (action instanceof Action)
902            return (Action) action;
903        return null;
904    }
905
906    ///////////////////////////////////////////////////////////////////////////
907    //  Implementation part
908    ///////////////////////////////////////////////////////////////////////////
909
910    /**
911     * Global panel.
912     */
913    public static final JPanel panel = new JPanel(new BorderLayout());
914
915    protected static volatile WindowGeometry geometry;
916    protected static int windowState = JFrame.NORMAL;
917
918    private final CommandQueueListener redoUndoListener = new CommandQueueListener() {
919        @Override
920        public void commandChanged(final int queueSize, final int redoSize) {
921            menu.undo.setEnabled(queueSize > 0);
922            menu.redo.setEnabled(redoSize > 0);
923        }
924    };
925
926    /**
927     * Should be called before the main constructor to setup some parameter stuff
928     * @param args The parsed argument list.
929     */
930    public static void preConstructorInit(Map<Option, Collection<String>> args) {
931        ProjectionPreference.setProjection();
932
933        try {
934            String defaultlaf = platform.getDefaultStyle();
935            String laf = Main.pref.get("laf", defaultlaf);
936            try {
937                UIManager.setLookAndFeel(laf);
938            } catch (final NoClassDefFoundError | ClassNotFoundException e) {
939                // Try to find look and feel in plugin classloaders
940                Class<?> klass = null;
941                for (ClassLoader cl : PluginHandler.getResourceClassLoaders()) {
942                    try {
943                        klass = cl.loadClass(laf);
944                        break;
945                    } catch (ClassNotFoundException ex) {
946                        // Do nothing
947                        if (Main.isTraceEnabled()) {
948                            Main.trace(ex.getMessage());
949                        }
950                    }
951                }
952                if (klass != null && LookAndFeel.class.isAssignableFrom(klass)) {
953                    try {
954                        UIManager.setLookAndFeel((LookAndFeel) klass.newInstance());
955                    } catch (Exception ex) {
956                        warn("Cannot set Look and Feel: " + laf + ": "+ex.getMessage());
957                    }
958                } else {
959                    info("Look and Feel not found: " + laf);
960                    Main.pref.put("laf", defaultlaf);
961                }
962            } catch (final UnsupportedLookAndFeelException e) {
963                info("Look and Feel not supported: " + laf);
964                Main.pref.put("laf", defaultlaf);
965            }
966            toolbar = new ToolbarPreferences();
967            contentPanePrivate.updateUI();
968            panel.updateUI();
969        } catch (final Exception e) {
970            error(e);
971        }
972        UIManager.put("OptionPane.okIcon", ImageProvider.get("ok"));
973        UIManager.put("OptionPane.yesIcon", UIManager.get("OptionPane.okIcon"));
974        UIManager.put("OptionPane.cancelIcon", ImageProvider.get("cancel"));
975        UIManager.put("OptionPane.noIcon", UIManager.get("OptionPane.cancelIcon"));
976
977        I18n.translateJavaInternalMessages();
978
979        // init default coordinate format
980        //
981        try {
982            CoordinateFormat.setCoordinateFormat(CoordinateFormat.valueOf(Main.pref.get("coordinates")));
983        } catch (IllegalArgumentException iae) {
984            CoordinateFormat.setCoordinateFormat(CoordinateFormat.DECIMAL_DEGREES);
985        }
986
987        geometry = WindowGeometry.mainWindow("gui.geometry",
988            args.containsKey(Option.GEOMETRY) ? args.get(Option.GEOMETRY).iterator().next() : null,
989            !args.containsKey(Option.NO_MAXIMIZE) && Main.pref.getBoolean("gui.maximized", false));
990    }
991
992    protected static void postConstructorProcessCmdLine(Map<Option, Collection<String>> args) {
993        if (args.containsKey(Option.DOWNLOAD)) {
994            List<File> fileList = new ArrayList<>();
995            for (String s : args.get(Option.DOWNLOAD)) {
996                DownloadParamType.paramType(s).download(s, fileList);
997            }
998            if (!fileList.isEmpty()) {
999                OpenFileAction.openFiles(fileList, true);
1000            }
1001        }
1002        if (args.containsKey(Option.DOWNLOADGPS)) {
1003            for (String s : args.get(Option.DOWNLOADGPS)) {
1004                DownloadParamType.paramType(s).downloadGps(s);
1005            }
1006        }
1007        if (args.containsKey(Option.SELECTION)) {
1008            for (String s : args.get(Option.SELECTION)) {
1009                SearchAction.search(s, SearchAction.SearchMode.add);
1010            }
1011        }
1012    }
1013
1014    /**
1015     * Asks user to perform "save layer" operations (save on disk and/or upload data to server) for all
1016     * {@link AbstractModifiableLayer} before JOSM exits.
1017     * @return {@code true} if there was nothing to save, or if the user wants to proceed to save operations.
1018     *         {@code false} if the user cancels.
1019     * @since 2025
1020     */
1021    public static boolean saveUnsavedModifications() {
1022        if (!isDisplayingMapView()) return true;
1023        return saveUnsavedModifications(map.mapView.getLayersOfType(AbstractModifiableLayer.class), true);
1024    }
1025
1026    /**
1027     * Asks user to perform "save layer" operations (save on disk and/or upload data to server) before data layers deletion.
1028     *
1029     * @param selectedLayers The layers to check. Only instances of {@link AbstractModifiableLayer} are considered.
1030     * @param exit {@code true} if JOSM is exiting, {@code false} otherwise.
1031     * @return {@code true} if there was nothing to save, or if the user wants to proceed to save operations.
1032     *         {@code false} if the user cancels.
1033     * @since 5519
1034     */
1035    public static boolean saveUnsavedModifications(Iterable<? extends Layer> selectedLayers, boolean exit) {
1036        SaveLayersDialog dialog = new SaveLayersDialog(parent);
1037        List<AbstractModifiableLayer> layersWithUnmodifiedChanges = new ArrayList<>();
1038        for (Layer l: selectedLayers) {
1039            if (!(l instanceof AbstractModifiableLayer)) {
1040                continue;
1041            }
1042            AbstractModifiableLayer odl = (AbstractModifiableLayer) l;
1043            if ((odl.requiresSaveToFile() || (odl.requiresUploadToServer() && !odl.isUploadDiscouraged())) && odl.isModified()) {
1044                layersWithUnmodifiedChanges.add(odl);
1045            }
1046        }
1047        if (exit) {
1048            dialog.prepareForSavingAndUpdatingLayersBeforeExit();
1049        } else {
1050            dialog.prepareForSavingAndUpdatingLayersBeforeDelete();
1051        }
1052        if (!layersWithUnmodifiedChanges.isEmpty()) {
1053            dialog.getModel().populate(layersWithUnmodifiedChanges);
1054            dialog.setVisible(true);
1055            switch(dialog.getUserAction()) {
1056            case PROCEED: return true;
1057            case CANCEL:
1058            default: return false;
1059            }
1060        }
1061
1062        return true;
1063    }
1064
1065    /**
1066     * Closes JOSM and optionally terminates the Java Virtual Machine (JVM).
1067     * If there are some unsaved data layers, asks first for user confirmation.
1068     * @param exit If {@code true}, the JVM is terminated by running {@link System#exit} with a given return code.
1069     * @param exitCode The return code
1070     * @return {@code true} if JOSM has been closed, {@code false} if the user has cancelled the operation.
1071     * @since 3378
1072     */
1073    public static boolean exitJosm(boolean exit, int exitCode) {
1074        if (Main.saveUnsavedModifications()) {
1075            worker.shutdown();
1076            ImageProvider.shutdown(false);
1077            JCSCacheManager.shutdown();
1078            geometry.remember("gui.geometry");
1079            if (map != null) {
1080                map.rememberToggleDialogWidth();
1081            }
1082            pref.put("gui.maximized", (windowState & JFrame.MAXIMIZED_BOTH) != 0);
1083            // Remove all layers because somebody may rely on layerRemoved events (like AutosaveTask)
1084            if (Main.isDisplayingMapView()) {
1085                Collection<Layer> layers = new ArrayList<>(Main.map.mapView.getAllLayers());
1086                for (Layer l: layers) {
1087                    Main.main.removeLayer(l);
1088                }
1089            }
1090            worker.shutdownNow();
1091            ImageProvider.shutdown(true);
1092
1093            if (exit) {
1094                System.exit(exitCode);
1095            }
1096            return true;
1097        }
1098        return false;
1099    }
1100
1101    /**
1102     * The type of a command line parameter, to be used in switch statements.
1103     * @see #paramType
1104     */
1105    enum DownloadParamType {
1106        httpUrl {
1107            @Override
1108            void download(String s, Collection<File> fileList) {
1109                new OpenLocationAction().openUrl(false, s);
1110            }
1111
1112            @Override
1113            void downloadGps(String s) {
1114                final Bounds b = OsmUrlToBounds.parse(s);
1115                if (b == null) {
1116                    JOptionPane.showMessageDialog(
1117                            Main.parent,
1118                            tr("Ignoring malformed URL: \"{0}\"", s),
1119                            tr("Warning"),
1120                            JOptionPane.WARNING_MESSAGE
1121                    );
1122                    return;
1123                }
1124                downloadFromParamBounds(true, b);
1125            }
1126        }, fileUrl {
1127            @Override
1128            void download(String s, Collection<File> fileList) {
1129                File f = null;
1130                try {
1131                    f = new File(new URI(s));
1132                } catch (URISyntaxException e) {
1133                    JOptionPane.showMessageDialog(
1134                            Main.parent,
1135                            tr("Ignoring malformed file URL: \"{0}\"", s),
1136                            tr("Warning"),
1137                            JOptionPane.WARNING_MESSAGE
1138                    );
1139                }
1140                if (f != null) {
1141                    fileList.add(f);
1142                }
1143            }
1144        }, bounds {
1145
1146            /**
1147             * Download area specified on the command line as bounds string.
1148             * @param rawGps Flag to download raw GPS tracks
1149             * @param s The bounds parameter
1150             */
1151            private void downloadFromParamBounds(final boolean rawGps, String s) {
1152                final StringTokenizer st = new StringTokenizer(s, ",");
1153                if (st.countTokens() == 4) {
1154                    Bounds b = new Bounds(
1155                            new LatLon(Double.parseDouble(st.nextToken()), Double.parseDouble(st.nextToken())),
1156                            new LatLon(Double.parseDouble(st.nextToken()), Double.parseDouble(st.nextToken()))
1157                    );
1158                    Main.downloadFromParamBounds(rawGps, b);
1159                }
1160            }
1161
1162            @Override
1163            void download(String param, Collection<File> fileList) {
1164                downloadFromParamBounds(false, param);
1165            }
1166
1167            @Override
1168            void downloadGps(String param) {
1169                downloadFromParamBounds(true, param);
1170            }
1171        }, fileName {
1172            @Override
1173            void download(String s, Collection<File> fileList) {
1174                fileList.add(new File(s));
1175            }
1176        };
1177
1178        /**
1179         * Performs the download
1180         * @param param represents the object to be downloaded
1181         * @param fileList files which shall be opened, should be added to this collection
1182         */
1183        abstract void download(String param, Collection<File> fileList);
1184
1185        /**
1186         * Performs the GPS download
1187         * @param param represents the object to be downloaded
1188         */
1189        void downloadGps(String param) {
1190            JOptionPane.showMessageDialog(
1191                    Main.parent,
1192                    tr("Parameter \"downloadgps\" does not accept file names or file URLs"),
1193                    tr("Warning"),
1194                    JOptionPane.WARNING_MESSAGE
1195            );
1196        }
1197
1198        /**
1199         * Guess the type of a parameter string specified on the command line with --download= or --downloadgps.
1200         *
1201         * @param s A parameter string
1202         * @return The guessed parameter type
1203         */
1204        static DownloadParamType paramType(String s) {
1205            if (s.startsWith("http:") || s.startsWith("https:")) return DownloadParamType.httpUrl;
1206            if (s.startsWith("file:")) return DownloadParamType.fileUrl;
1207            String coorPattern = "\\s*[+-]?[0-9]+(\\.[0-9]+)?\\s*";
1208            if (s.matches(coorPattern + "(," + coorPattern + "){3}")) return DownloadParamType.bounds;
1209            // everything else must be a file name
1210            return DownloadParamType.fileName;
1211        }
1212    }
1213
1214    /**
1215     * Download area specified as Bounds value.
1216     * @param rawGps Flag to download raw GPS tracks
1217     * @param b The bounds value
1218     */
1219    private static void downloadFromParamBounds(final boolean rawGps, Bounds b) {
1220        DownloadTask task = rawGps ? new DownloadGpsTask() : new DownloadOsmTask();
1221        // asynchronously launch the download task ...
1222        Future<?> future = task.download(true, b, null);
1223        // ... and the continuation when the download is finished (this will wait for the download to finish)
1224        Main.worker.execute(new PostDownloadHandler(task, future));
1225    }
1226
1227    /**
1228     * Identifies the current operating system family and initializes the platform hook accordingly.
1229     * @since 1849
1230     */
1231    public static void determinePlatformHook() {
1232        String os = System.getProperty("os.name");
1233        if (os == null) {
1234            warn("Your operating system has no name, so I'm guessing its some kind of *nix.");
1235            platform = new PlatformHookUnixoid();
1236        } else if (os.toLowerCase(Locale.ENGLISH).startsWith("windows")) {
1237            platform = new PlatformHookWindows();
1238        } else if ("Linux".equals(os) || "Solaris".equals(os) ||
1239                "SunOS".equals(os) || "AIX".equals(os) ||
1240                "FreeBSD".equals(os) || "NetBSD".equals(os) || "OpenBSD".equals(os)) {
1241            platform = new PlatformHookUnixoid();
1242        } else if (os.toLowerCase(Locale.ENGLISH).startsWith("mac os x")) {
1243            platform = new PlatformHookOsx();
1244        } else {
1245            warn("I don't know your operating system '"+os+"', so I'm guessing its some kind of *nix.");
1246            platform = new PlatformHookUnixoid();
1247        }
1248    }
1249
1250    private static class WindowPositionSizeListener extends WindowAdapter implements
1251    ComponentListener {
1252        @Override
1253        public void windowStateChanged(WindowEvent e) {
1254            Main.windowState = e.getNewState();
1255        }
1256
1257        @Override
1258        public void componentHidden(ComponentEvent e) {
1259        }
1260
1261        @Override
1262        public void componentMoved(ComponentEvent e) {
1263            handleComponentEvent(e);
1264        }
1265
1266        @Override
1267        public void componentResized(ComponentEvent e) {
1268            handleComponentEvent(e);
1269        }
1270
1271        @Override
1272        public void componentShown(ComponentEvent e) {
1273        }
1274
1275        private static void handleComponentEvent(ComponentEvent e) {
1276            Component c = e.getComponent();
1277            if (c instanceof JFrame && c.isVisible()) {
1278                if (Main.windowState == JFrame.NORMAL) {
1279                    Main.geometry = new WindowGeometry((JFrame) c);
1280                } else {
1281                    Main.geometry.fixScreen((JFrame) c);
1282                }
1283            }
1284        }
1285    }
1286
1287    protected static void addListener() {
1288        parent.addComponentListener(new WindowPositionSizeListener());
1289        ((JFrame) parent).addWindowStateListener(new WindowPositionSizeListener());
1290    }
1291
1292    /**
1293     * Determines if JOSM currently runs with Java 8 or later.
1294     * @return {@code true} if the current JVM is at least Java 8, {@code false} otherwise
1295     * @since 7894
1296     */
1297    public static boolean isJava8orLater() {
1298        String version = System.getProperty("java.version");
1299        return version != null && !version.matches("^(1\\.)?[7].*");
1300    }
1301
1302    /**
1303     * Checks that JOSM is at least running with Java 7.
1304     * @since 7001
1305     */
1306    public static void checkJavaVersion() {
1307        String version = System.getProperty("java.version");
1308        if (version != null) {
1309            if (version.matches("^(1\\.)?[789].*"))
1310                return;
1311            if (version.matches("^(1\\.)?[56].*")) {
1312                JMultilineLabel ho = new JMultilineLabel("<html>"+
1313                        tr("<h2>JOSM requires Java version {0}.</h2>"+
1314                                "Detected Java version: {1}.<br>"+
1315                                "You can <ul><li>update your Java (JRE) or</li>"+
1316                                "<li>use an earlier (Java {2} compatible) version of JOSM.</li></ul>"+
1317                                "More Info:", "7", version, "6")+"</html>");
1318                JTextArea link = new JTextArea(HelpUtil.getWikiBaseHelpUrl()+"/Help/SystemRequirements");
1319                link.setEditable(false);
1320                link.setBackground(panel.getBackground());
1321                JPanel panel = new JPanel(new GridBagLayout());
1322                GridBagConstraints gbc = new GridBagConstraints();
1323                gbc.gridwidth = GridBagConstraints.REMAINDER;
1324                gbc.anchor = GridBagConstraints.WEST;
1325                gbc.weightx = 1.0;
1326                panel.add(ho, gbc);
1327                panel.add(link, gbc);
1328                final String EXIT = tr("Exit JOSM");
1329                final String CONTINUE = tr("Continue, try anyway");
1330                int ret = JOptionPane.showOptionDialog(null, panel, tr("Error"), JOptionPane.YES_NO_OPTION,
1331                        JOptionPane.ERROR_MESSAGE, null, new String[] {EXIT, CONTINUE}, EXIT);
1332                if (ret == 0) {
1333                    System.exit(0);
1334                }
1335                return;
1336            }
1337        }
1338        error("Could not recognize Java Version: "+version);
1339    }
1340
1341    /* ----------------------------------------------------------------------------------------- */
1342    /* projection handling  - Main is a registry for a single, global projection instance        */
1343    /*                                                                                           */
1344    /* TODO: For historical reasons the registry is implemented by Main. An alternative approach */
1345    /* would be a singleton org.openstreetmap.josm.data.projection.ProjectionRegistry class.     */
1346    /* ----------------------------------------------------------------------------------------- */
1347    /**
1348     * The projection method used.
1349     * use {@link #getProjection()} and {@link #setProjection(Projection)} for access.
1350     * Use {@link #setProjection(Projection)} in order to trigger a projection change event.
1351     */
1352    private static volatile Projection proj;
1353
1354    /**
1355     * Replies the current projection.
1356     *
1357     * @return the currently active projection
1358     */
1359    public static Projection getProjection() {
1360        return proj;
1361    }
1362
1363    /**
1364     * Sets the current projection
1365     *
1366     * @param p the projection
1367     */
1368    public static void setProjection(Projection p) {
1369        CheckParameterUtil.ensureParameterNotNull(p);
1370        Projection oldValue = proj;
1371        Bounds b = isDisplayingMapView() ? map.mapView.getRealBounds() : null;
1372        proj = p;
1373        fireProjectionChanged(oldValue, proj, b);
1374    }
1375
1376    /*
1377     * Keep WeakReferences to the listeners. This relieves clients from the burden of
1378     * explicitly removing the listeners and allows us to transparently register every
1379     * created dataset as projection change listener.
1380     */
1381    private static final List<WeakReference<ProjectionChangeListener>> listeners = new ArrayList<>();
1382
1383    private static void fireProjectionChanged(Projection oldValue, Projection newValue, Bounds oldBounds) {
1384        if (newValue == null ^ oldValue == null
1385                || (newValue != null && oldValue != null && !Objects.equals(newValue.toCode(), oldValue.toCode()))) {
1386
1387            synchronized (Main.class) {
1388                Iterator<WeakReference<ProjectionChangeListener>> it = listeners.iterator();
1389                while (it.hasNext()) {
1390                    WeakReference<ProjectionChangeListener> wr = it.next();
1391                    ProjectionChangeListener listener = wr.get();
1392                    if (listener == null) {
1393                        it.remove();
1394                        continue;
1395                    }
1396                    listener.projectionChanged(oldValue, newValue);
1397                }
1398            }
1399            if (newValue != null && oldBounds != null) {
1400                Main.map.mapView.zoomTo(oldBounds);
1401            }
1402            /* TODO - remove layers with fixed projection */
1403        }
1404    }
1405
1406    /**
1407     * Register a projection change listener.
1408     *
1409     * @param listener the listener. Ignored if <code>null</code>.
1410     */
1411    public static void addProjectionChangeListener(ProjectionChangeListener listener) {
1412        if (listener == null) return;
1413        synchronized (Main.class) {
1414            for (WeakReference<ProjectionChangeListener> wr : listeners) {
1415                // already registered ? => abort
1416                if (wr.get() == listener) return;
1417            }
1418            listeners.add(new WeakReference<>(listener));
1419        }
1420    }
1421
1422    /**
1423     * Removes a projection change listener.
1424     *
1425     * @param listener the listener. Ignored if <code>null</code>.
1426     */
1427    public static void removeProjectionChangeListener(ProjectionChangeListener listener) {
1428        if (listener == null) return;
1429        synchronized (Main.class) {
1430            Iterator<WeakReference<ProjectionChangeListener>> it = listeners.iterator();
1431            while (it.hasNext()) {
1432                WeakReference<ProjectionChangeListener> wr = it.next();
1433                // remove the listener - and any other listener which got garbage
1434                // collected in the meantime
1435                if (wr.get() == null || wr.get() == listener) {
1436                    it.remove();
1437                }
1438            }
1439        }
1440    }
1441
1442    /**
1443     * Listener for window switch events.
1444     *
1445     * These are events, when the user activates a window of another application
1446     * or comes back to JOSM. Window switches from one JOSM window to another
1447     * are not reported.
1448     */
1449    public interface WindowSwitchListener {
1450        /**
1451         * Called when the user activates a window of another application.
1452         */
1453        void toOtherApplication();
1454
1455        /**
1456         * Called when the user comes from a window of another application back to JOSM.
1457         */
1458        void fromOtherApplication();
1459    }
1460
1461    private static final List<WeakReference<WindowSwitchListener>> windowSwitchListeners = new ArrayList<>();
1462
1463    /**
1464     * Register a window switch listener.
1465     *
1466     * @param listener the listener. Ignored if <code>null</code>.
1467     */
1468    public static void addWindowSwitchListener(WindowSwitchListener listener) {
1469        if (listener == null) return;
1470        synchronized (Main.class) {
1471            for (WeakReference<WindowSwitchListener> wr : windowSwitchListeners) {
1472                // already registered ? => abort
1473                if (wr.get() == listener) return;
1474            }
1475            boolean wasEmpty = windowSwitchListeners.isEmpty();
1476            windowSwitchListeners.add(new WeakReference<>(listener));
1477            if (wasEmpty) {
1478                // The following call will have no effect, when there is no window
1479                // at the time. Therefore, MasterWindowListener.setup() will also be
1480                // called, as soon as the main window is shown.
1481                MasterWindowListener.setup();
1482            }
1483        }
1484    }
1485
1486    /**
1487     * Removes a window switch listener.
1488     *
1489     * @param listener the listener. Ignored if <code>null</code>.
1490     */
1491    public static void removeWindowSwitchListener(WindowSwitchListener listener) {
1492        if (listener == null) return;
1493        synchronized (Main.class) {
1494            Iterator<WeakReference<WindowSwitchListener>> it = windowSwitchListeners.iterator();
1495            while (it.hasNext()) {
1496                WeakReference<WindowSwitchListener> wr = it.next();
1497                // remove the listener - and any other listener which got garbage
1498                // collected in the meantime
1499                if (wr.get() == null || wr.get() == listener) {
1500                    it.remove();
1501                }
1502            }
1503            if (windowSwitchListeners.isEmpty()) {
1504                MasterWindowListener.teardown();
1505            }
1506        }
1507    }
1508
1509    /**
1510     * WindowListener, that is registered on all Windows of the application.
1511     *
1512     * Its purpose is to notify WindowSwitchListeners, that the user switches to
1513     * another application, e.g. a browser, or back to JOSM.
1514     *
1515     * When changing from JOSM to another application and back (e.g. two times
1516     * alt+tab), the active Window within JOSM may be different.
1517     * Therefore, we need to register listeners to <strong>all</strong> (visible)
1518     * Windows in JOSM, and it does not suffice to monitor the one that was
1519     * deactivated last.
1520     *
1521     * This class is only "active" on demand, i.e. when there is at least one
1522     * WindowSwitchListener registered.
1523     */
1524    protected static class MasterWindowListener extends WindowAdapter {
1525
1526        private static MasterWindowListener INSTANCE;
1527
1528        public static synchronized MasterWindowListener getInstance() {
1529            if (INSTANCE == null) {
1530                INSTANCE = new MasterWindowListener();
1531            }
1532            return INSTANCE;
1533        }
1534
1535        /**
1536         * Register listeners to all non-hidden windows.
1537         *
1538         * Windows that are created later, will be cared for in {@link #windowDeactivated(WindowEvent)}.
1539         */
1540        public static void setup() {
1541            if (!windowSwitchListeners.isEmpty()) {
1542                for (Window w : Window.getWindows()) {
1543                    if (w.isShowing()) {
1544                        if (!Arrays.asList(w.getWindowListeners()).contains(getInstance())) {
1545                            w.addWindowListener(getInstance());
1546                        }
1547                    }
1548                }
1549            }
1550        }
1551
1552        /**
1553         * Unregister all listeners.
1554         */
1555        public static void teardown() {
1556            for (Window w : Window.getWindows()) {
1557                w.removeWindowListener(getInstance());
1558            }
1559        }
1560
1561        @Override
1562        public void windowActivated(WindowEvent e) {
1563            if (e.getOppositeWindow() == null) { // we come from a window of a different application
1564                // fire WindowSwitchListeners
1565                synchronized (Main.class) {
1566                    Iterator<WeakReference<WindowSwitchListener>> it = windowSwitchListeners.iterator();
1567                    while (it.hasNext()) {
1568                        WeakReference<WindowSwitchListener> wr = it.next();
1569                        WindowSwitchListener listener = wr.get();
1570                        if (listener == null) {
1571                            it.remove();
1572                            continue;
1573                        }
1574                        listener.fromOtherApplication();
1575                    }
1576                }
1577            }
1578        }
1579
1580        @Override
1581        public void windowDeactivated(WindowEvent e) {
1582            // set up windows that have been created in the meantime
1583            for (Window w : Window.getWindows()) {
1584                if (!w.isShowing()) {
1585                    w.removeWindowListener(getInstance());
1586                } else {
1587                    if (!Arrays.asList(w.getWindowListeners()).contains(getInstance())) {
1588                        w.addWindowListener(getInstance());
1589                    }
1590                }
1591            }
1592            if (e.getOppositeWindow() == null) { // we go to a window of a different application
1593                // fire WindowSwitchListeners
1594                synchronized (Main.class) {
1595                    Iterator<WeakReference<WindowSwitchListener>> it = windowSwitchListeners.iterator();
1596                    while (it.hasNext()) {
1597                        WeakReference<WindowSwitchListener> wr = it.next();
1598                        WindowSwitchListener listener = wr.get();
1599                        if (listener == null) {
1600                            it.remove();
1601                            continue;
1602                        }
1603                        listener.toOtherApplication();
1604                    }
1605                }
1606            }
1607        }
1608    }
1609
1610    /**
1611     * Registers a new {@code MapFrameListener} that will be notified of MapFrame changes
1612     * @param listener The MapFrameListener
1613     * @param fireWhenMapViewPresent If true, will fire an initial mapFrameInitialized event
1614     * when the MapFrame is present. Otherwise will only fire when the MapFrame is created
1615     * or destroyed.
1616     * @return {@code true} if the listeners collection changed as a result of the call
1617     */
1618    public static boolean addMapFrameListener(MapFrameListener listener, boolean fireWhenMapViewPresent) {
1619        boolean changed = listener != null ? mapFrameListeners.add(listener) : false;
1620        if (fireWhenMapViewPresent && changed && map != null) {
1621            listener.mapFrameInitialized(null, map);
1622        }
1623        return changed;
1624    }
1625
1626    /**
1627     * Registers a new {@code MapFrameListener} that will be notified of MapFrame changes
1628     * @param listener The MapFrameListener
1629     * @return {@code true} if the listeners collection changed as a result of the call
1630     * @since 5957
1631     */
1632    public static boolean addMapFrameListener(MapFrameListener listener) {
1633        return addMapFrameListener(listener, false);
1634    }
1635
1636    /**
1637     * Unregisters the given {@code MapFrameListener} from MapFrame changes
1638     * @param listener The MapFrameListener
1639     * @return {@code true} if the listeners collection changed as a result of the call
1640     * @since 5957
1641     */
1642    public static boolean removeMapFrameListener(MapFrameListener listener) {
1643        return listener != null ? mapFrameListeners.remove(listener) : false;
1644    }
1645
1646    /**
1647     * Adds a new network error that occur to give a hint about broken Internet connection.
1648     * Do not use this method for errors known for sure thrown because of a bad proxy configuration.
1649     *
1650     * @param url The accessed URL that caused the error
1651     * @param t The network error
1652     * @return The previous error associated to the given resource, if any. Can be {@code null}
1653     * @since 6642
1654     */
1655    public static Throwable addNetworkError(URL url, Throwable t) {
1656        if (url != null && t != null) {
1657            Throwable old = addNetworkError(url.toExternalForm(), t);
1658            if (old != null) {
1659                Main.warn("Already here "+old);
1660            }
1661            return old;
1662        }
1663        return null;
1664    }
1665
1666    /**
1667     * Adds a new network error that occur to give a hint about broken Internet connection.
1668     * Do not use this method for errors known for sure thrown because of a bad proxy configuration.
1669     *
1670     * @param url The accessed URL that caused the error
1671     * @param t The network error
1672     * @return The previous error associated to the given resource, if any. Can be {@code null}
1673     * @since 6642
1674     */
1675    public static Throwable addNetworkError(String url, Throwable t) {
1676        if (url != null && t != null) {
1677            return NETWORK_ERRORS.put(url, t);
1678        }
1679        return null;
1680    }
1681
1682    /**
1683     * Returns the network errors that occured until now.
1684     * @return the network errors that occured until now, indexed by URL
1685     * @since 6639
1686     */
1687    public static Map<String, Throwable> getNetworkErrors() {
1688        return new HashMap<>(NETWORK_ERRORS);
1689    }
1690
1691    /**
1692     * Returns the command-line arguments used to run the application.
1693     * @return the command-line arguments used to run the application
1694     * @since 8356
1695     */
1696    public static List<String> getCommandLineArgs() {
1697        return Collections.unmodifiableList(COMMAND_LINE_ARGS);
1698    }
1699
1700    /**
1701     * Returns the JOSM website URL.
1702     * @return the josm website URL
1703     * @since 6897
1704     */
1705    public static String getJOSMWebsite() {
1706        if (Main.pref != null)
1707            return Main.pref.get("josm.url", JOSM_WEBSITE);
1708        return JOSM_WEBSITE;
1709    }
1710
1711    /**
1712     * Returns the JOSM XML URL.
1713     * @return the josm XML URL
1714     * @since 6897
1715     */
1716    public static String getXMLBase() {
1717        // Always return HTTP (issues reported with HTTPS)
1718        return "http://josm.openstreetmap.de";
1719    }
1720
1721    /**
1722     * Returns the OSM website URL.
1723     * @return the OSM website URL
1724     * @since 6897
1725     */
1726    public static String getOSMWebsite() {
1727        if (Main.pref != null)
1728            return Main.pref.get("osm.url", OSM_WEBSITE);
1729        return OSM_WEBSITE;
1730    }
1731
1732    /**
1733     * Replies the base URL for browsing information about a primitive.
1734     * @return the base URL, i.e. https://www.openstreetmap.org
1735     * @since 7678
1736     */
1737    public static String getBaseBrowseUrl() {
1738        if (Main.pref != null)
1739            return Main.pref.get("osm-browse.url", getOSMWebsite());
1740        return getOSMWebsite();
1741    }
1742
1743    /**
1744     * Replies the base URL for browsing information about a user.
1745     * @return the base URL, i.e. https://www.openstreetmap.org/user
1746     * @since 7678
1747     */
1748    public static String getBaseUserUrl() {
1749        if (Main.pref != null)
1750            return Main.pref.get("osm-user.url", getOSMWebsite() + "/user");
1751        return getOSMWebsite() + "/user";
1752    }
1753
1754    /**
1755     * Determines if we are currently running on OSX.
1756     * @return {@code true} if we are currently running on OSX
1757     * @since 6957
1758     */
1759    public static boolean isPlatformOsx() {
1760        return Main.platform instanceof PlatformHookOsx;
1761    }
1762
1763    /**
1764     * Determines if we are currently running on Windows.
1765     * @return {@code true} if we are currently running on Windows
1766     * @since 7335
1767     */
1768    public static boolean isPlatformWindows() {
1769        return Main.platform instanceof PlatformHookWindows;
1770    }
1771
1772    /**
1773     * Determines if the given online resource is currently offline.
1774     * @param r the online resource
1775     * @return {@code true} if {@code r} is offline and should not be accessed
1776     * @since 7434
1777     */
1778    public static boolean isOffline(OnlineResource r) {
1779        return OFFLINE_RESOURCES.contains(r) || OFFLINE_RESOURCES.contains(OnlineResource.ALL);
1780    }
1781
1782    /**
1783     * Sets the given online resource to offline state.
1784     * @param r the online resource
1785     * @return {@code true} if {@code r} was not already offline
1786     * @since 7434
1787     */
1788    public static boolean setOffline(OnlineResource r) {
1789        return OFFLINE_RESOURCES.add(r);
1790    }
1791
1792    /**
1793     * Sets the given online resource to online state.
1794     * @param r the online resource
1795     * @return {@code true} if {@code r} was offline
1796     * @since 8506
1797     */
1798    public static boolean setOnline(OnlineResource r) {
1799        return OFFLINE_RESOURCES.remove(r);
1800    }
1801
1802    /**
1803     * Replies the set of online resources currently offline.
1804     * @return the set of online resources currently offline
1805     * @since 7434
1806     */
1807    public static Set<OnlineResource> getOfflineResources() {
1808        return new HashSet<>(OFFLINE_RESOURCES);
1809    }
1810}