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.ArrayList;
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5 | import java.util.Arrays;
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6 | import java.util.List;
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7 | import java.util.Objects;
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8 | import java.util.Queue;
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9 | import java.util.concurrent.CopyOnWriteArrayList;
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10 | import java.util.concurrent.LinkedBlockingQueue;
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11 |
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12 | import javax.swing.SwingUtilities;
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13 |
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14 | import org.openstreetmap.josm.data.osm.DataSet;
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15 | import org.openstreetmap.josm.data.osm.event.DataSetListenerAdapter.Listener;
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16 | import org.openstreetmap.josm.gui.MapView;
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17 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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18 |
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19 | /**
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20 | * This class allows to add DatasetListener to currently active dataset. If active
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21 | * layer is changed, listeners are automatically registered at new active dataset
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22 | * (it's no longer necessary to register for layer events and reregister every time
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23 | * new layer is selected)
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24 | *
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25 | * Events in EDT are supported, see {@link #addDatasetListener(DataSetListener, FireMode)}
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26 | *
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27 | */
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28 | public class DatasetEventManager implements MapView.EditLayerChangeListener, Listener {
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29 |
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30 | private static final DatasetEventManager instance = new DatasetEventManager();
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31 |
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32 | private final class EdtRunnable implements Runnable {
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33 | @Override
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34 | public void run() {
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35 | while (!eventsInEDT.isEmpty()) {
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36 | DataSet dataSet = null;
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37 | AbstractDatasetChangedEvent consolidatedEvent = null;
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38 | AbstractDatasetChangedEvent event = null;
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39 |
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40 | while ((event = eventsInEDT.poll()) != null) {
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41 | fireEvents(inEDTListeners, event);
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42 |
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43 | // DataSet changed - fire consolidated event early
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44 | if (consolidatedEvent != null && dataSet != event.getDataset()) {
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45 | fireConsolidatedEvents(inEDTListeners, consolidatedEvent);
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46 | consolidatedEvent = null;
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47 | }
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48 |
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49 | dataSet = event.getDataset();
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50 |
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51 | // Build consolidated event
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52 | if (event instanceof DataChangedEvent) {
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53 | // DataChangeEvent can contains other events, so it gets special handling
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54 | DataChangedEvent dataEvent = (DataChangedEvent) event;
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55 | if (dataEvent.getEvents() == null) {
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56 | consolidatedEvent = dataEvent; // Dataset was completely changed, we can ignore older events
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57 | } else {
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58 | if (consolidatedEvent == null) {
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59 | consolidatedEvent = new DataChangedEvent(dataSet, dataEvent.getEvents());
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60 | } else if (consolidatedEvent instanceof DataChangedEvent) {
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61 | List<AbstractDatasetChangedEvent> evts = ((DataChangedEvent) consolidatedEvent).getEvents();
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62 | if (evts != null) {
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63 | evts.addAll(dataEvent.getEvents());
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64 | }
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65 | } else {
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66 | AbstractDatasetChangedEvent oldConsolidateEvent = consolidatedEvent;
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67 | consolidatedEvent = new DataChangedEvent(dataSet, dataEvent.getEvents());
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68 | ((DataChangedEvent) consolidatedEvent).getEvents().add(oldConsolidateEvent);
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69 | }
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70 | }
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71 | } else {
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72 | // Normal events
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73 | if (consolidatedEvent == null) {
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74 | consolidatedEvent = event;
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75 | } else if (consolidatedEvent instanceof DataChangedEvent) {
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76 | List<AbstractDatasetChangedEvent> evs = ((DataChangedEvent) consolidatedEvent).getEvents();
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77 | if (evs != null) {
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78 | evs.add(event);
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79 | }
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80 | } else {
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81 | consolidatedEvent = new DataChangedEvent(dataSet, new ArrayList<>(Arrays.asList(consolidatedEvent)));
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82 | }
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83 | }
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84 | }
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85 |
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86 | // Fire consolidated event
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87 | fireConsolidatedEvents(inEDTListeners, consolidatedEvent);
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88 | }
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89 | }
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90 | }
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91 |
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92 | public enum FireMode {
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93 | /**
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94 | * Fire in calling thread immediately.
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95 | */
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96 | IMMEDIATELY,
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97 | /**
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98 | * Fire in event dispatch thread.
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99 | */
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100 | IN_EDT,
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101 | /**
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102 | * Fire in event dispatch thread. If more than one event arrived when event queue is checked, merged them to one event
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103 | */
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104 | IN_EDT_CONSOLIDATED
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105 | }
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106 |
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107 | private static class ListenerInfo {
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108 | private final DataSetListener listener;
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109 | private final boolean consolidate;
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110 |
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111 | ListenerInfo(DataSetListener listener, boolean consolidate) {
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112 | this.listener = listener;
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113 | this.consolidate = consolidate;
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114 | }
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115 |
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116 | @Override
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117 | public int hashCode() {
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118 | return Objects.hash(listener);
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119 | }
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120 |
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121 | @Override
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122 | public boolean equals(Object o) {
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123 | if (this == o) return true;
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124 | if (o == null || getClass() != o.getClass()) return false;
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125 | ListenerInfo that = (ListenerInfo) o;
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126 | return Objects.equals(listener, that.listener);
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127 | }
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128 | }
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129 |
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130 | /**
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131 | * Replies the unique instance.
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132 | * @return the unique instance
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133 | */
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134 | public static DatasetEventManager getInstance() {
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135 | return instance;
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136 | }
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137 |
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138 | private final Queue<AbstractDatasetChangedEvent> eventsInEDT = new LinkedBlockingQueue<>();
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139 | private final CopyOnWriteArrayList<ListenerInfo> inEDTListeners = new CopyOnWriteArrayList<>();
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140 | private final CopyOnWriteArrayList<ListenerInfo> normalListeners = new CopyOnWriteArrayList<>();
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141 | private final DataSetListener myListener = new DataSetListenerAdapter(this);
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142 | private final Runnable edtRunnable = new EdtRunnable();
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143 |
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144 | /**
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145 | * Constructs a new {@code DatasetEventManager}.
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146 | */
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147 | public DatasetEventManager() {
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148 | MapView.addEditLayerChangeListener(this);
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149 | }
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150 |
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151 | /**
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152 | * Register listener, that will receive events from currently active dataset
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153 | * @param listener the listener to be registered
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154 | * @param fireMode If {@link FireMode#IN_EDT} or {@link FireMode#IN_EDT_CONSOLIDATED},
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155 | * listener will be notified in event dispatch thread instead of thread that caused
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156 | * the dataset change
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157 | */
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158 | public void addDatasetListener(DataSetListener listener, FireMode fireMode) {
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159 | if (fireMode == FireMode.IN_EDT || fireMode == FireMode.IN_EDT_CONSOLIDATED) {
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160 | inEDTListeners.addIfAbsent(new ListenerInfo(listener, fireMode == FireMode.IN_EDT_CONSOLIDATED));
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161 | } else {
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162 | normalListeners.addIfAbsent(new ListenerInfo(listener, false));
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163 | }
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164 | }
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165 |
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166 | public void removeDatasetListener(DataSetListener listener) {
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167 | ListenerInfo searchListener = new ListenerInfo(listener, false);
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168 | inEDTListeners.remove(searchListener);
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169 | normalListeners.remove(searchListener);
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170 | }
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171 |
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172 | @Override
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173 | public void editLayerChanged(OsmDataLayer oldLayer, OsmDataLayer newLayer) {
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174 | if (oldLayer != null) {
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175 | oldLayer.data.removeDataSetListener(myListener);
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176 | }
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177 |
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178 | if (newLayer != null) {
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179 | newLayer.data.addDataSetListener(myListener);
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180 | processDatasetEvent(new DataChangedEvent(newLayer.data));
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181 | } else {
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182 | processDatasetEvent(new DataChangedEvent(null));
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183 | }
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184 | }
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185 |
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186 | private void fireEvents(List<ListenerInfo> listeners, AbstractDatasetChangedEvent event) {
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187 | for (ListenerInfo listener: listeners) {
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188 | if (!listener.consolidate) {
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189 | event.fire(listener.listener);
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190 | }
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191 | }
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192 | }
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193 |
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194 | private void fireConsolidatedEvents(List<ListenerInfo> listeners, AbstractDatasetChangedEvent event) {
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195 | for (ListenerInfo listener: listeners) {
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196 | if (listener.consolidate) {
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197 | event.fire(listener.listener);
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198 | }
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199 | }
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200 | }
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201 |
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202 | @Override
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203 | public void processDatasetEvent(AbstractDatasetChangedEvent event) {
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204 | fireEvents(normalListeners, event);
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205 | eventsInEDT.add(event);
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206 | SwingUtilities.invokeLater(edtRunnable);
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207 | }
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208 | }
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