1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.osm.event;
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3 |
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4 | import java.util.Queue;
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5 | import java.util.concurrent.CopyOnWriteArrayList;
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6 | import java.util.concurrent.LinkedBlockingQueue;
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7 |
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8 | import javax.swing.SwingUtilities;
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9 |
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10 | import org.openstreetmap.josm.data.osm.event.DataSetListenerAdapter.Listener;
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11 | import org.openstreetmap.josm.gui.MapView;
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12 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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13 |
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14 |
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15 | /**
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16 | * This class allows to add DatasetListener to currently active dataset. If active
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17 | * layer is changed, listeners are automatically registered at new active dataset
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18 | * (it's no longer necessary to register for layer events and reregister every time
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19 | * new layer is selected)
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20 | *
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21 | * Events in EDT are supported, see {@link #addDatasetListener(DataSetListener, boolean)}
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22 | *
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23 | */
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24 | public class DatasetEventManager implements MapView.EditLayerChangeListener, Listener {
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25 |
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26 | private static final DatasetEventManager instance = new DatasetEventManager();
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27 |
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28 | public static DatasetEventManager getInstance() {
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29 | return instance;
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30 | }
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31 |
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32 | private final Queue<AbstractDatasetChangedEvent> eventsInEDT = new LinkedBlockingQueue<AbstractDatasetChangedEvent>();
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33 | private final CopyOnWriteArrayList<DataSetListener> inEDTListeners = new CopyOnWriteArrayList<DataSetListener>();
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34 | private final CopyOnWriteArrayList<DataSetListener> normalListeners = new CopyOnWriteArrayList<DataSetListener>();
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35 | private final DataSetListener myListener = new DataSetListenerAdapter(this);
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36 |
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37 | public DatasetEventManager() {
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38 | MapView.addEditLayerChangeListener(this);
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39 | }
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40 |
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41 | /**
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42 | * Register listener, that will receive events from currently active dataset
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43 | * @param listener
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44 | * @param fireInEDT If true, listener will be notified in event dispatch thread
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45 | * instead of thread that caused the dataset change
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46 | */
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47 | public void addDatasetListener(DataSetListener listener, boolean fireInEDT) {
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48 | if (fireInEDT) {
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49 | inEDTListeners.addIfAbsent(listener);
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50 | } else {
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51 | normalListeners.addIfAbsent(listener);
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52 | }
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53 | }
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54 |
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55 | public void removeDatasetListener(DataSetListener listener) {
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56 | inEDTListeners.remove(listener);
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57 | normalListeners.remove(listener);
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58 | }
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59 |
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60 | public void editLayerChanged(OsmDataLayer oldLayer, OsmDataLayer newLayer) {
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61 | if (oldLayer != null) {
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62 | oldLayer.data.removeDataSetListener(myListener);
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63 | }
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64 |
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65 | if (newLayer != null) {
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66 | newLayer.data.addDataSetListener(myListener);
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67 | processDatasetEvent(new DataChangedEvent(newLayer.data));
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68 | } else {
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69 | processDatasetEvent(new DataChangedEvent(null));
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70 | }
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71 | }
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72 |
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73 | public void processDatasetEvent(AbstractDatasetChangedEvent event) {
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74 | for (DataSetListener listener: normalListeners) {
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75 | event.fire(listener);
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76 | }
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77 | eventsInEDT.add(event);
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78 | SwingUtilities.invokeLater(edtRunnable);
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79 | }
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80 |
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81 | private final Runnable edtRunnable = new Runnable() {
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82 | public void run() {
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83 | AbstractDatasetChangedEvent event = null;
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84 | while ((event = eventsInEDT.poll()) != null) {
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85 | for (DataSetListener listener: inEDTListeners) {
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86 | event.fire(listener);
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87 | }
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88 | }
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89 | }
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90 | };
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91 | }
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