1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.g2d.layers;
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14 import java.util.Collections;
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15 import java.util.Comparator;
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16 import java.util.Set;
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17 import java.util.TreeSet;
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18 import java.util.concurrent.CopyOnWriteArrayList;
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21 * @author Antti Villberg
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23 public class SimpleLayers implements ILayersEditor {
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25 private static final Comparator<ILayer> LAYER_COMPARATOR = new Comparator<ILayer>() {
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27 public int compare(ILayer o1, ILayer o2) {
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28 return o1.getName().compareTo(o2.getName());
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32 private Set<ILayer> all = new TreeSet<ILayer>(LAYER_COMPARATOR);
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33 private volatile Set<ILayer> allSnapshot;
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35 private Set<ILayer> visible = new TreeSet<ILayer>(LAYER_COMPARATOR);
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36 private volatile Set<ILayer> visibleSnapshot;
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38 private CopyOnWriteArrayList<ILayersEditorListener> listeners = new CopyOnWriteArrayList<ILayersEditorListener>();
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40 private boolean ignoreFocusSettings = false;
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42 private boolean ignoreVisibilitySettings = false;
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44 public SimpleLayers() {
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47 public SimpleLayers(String... content) {
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48 for (String s : content) {
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49 ILayer layer = new SimpleLayer(s);
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54 visibleSnapshot = null;
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58 public Set<ILayer> getLayers() {
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59 // Double-checked locking idiom: http://en.wikipedia.org/wiki/Double-checked_locking
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60 // Works with acquire/release semantics for volatile
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61 // Broken under Java 1.4 and earlier semantics for volatile
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62 if (allSnapshot == null) {
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63 synchronized (this) {
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64 if (allSnapshot == null) {
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65 TreeSet<ILayer> ss = new TreeSet<ILayer>(LAYER_COMPARATOR);
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67 allSnapshot = Collections.unmodifiableSet(ss);
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75 public Set<ILayer> getVisibleLayers() {
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76 // Double-checked locking idiom: http://en.wikipedia.org/wiki/Double-checked_locking
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77 // Works with acquire/release semantics for volatile
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78 // Broken under Java 1.4 and earlier semantics for volatile
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79 if (visibleSnapshot == null) {
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80 synchronized (this) {
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81 if (visibleSnapshot == null) {
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82 TreeSet<ILayer> ss = new TreeSet<ILayer>(LAYER_COMPARATOR);
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84 visibleSnapshot = Collections.unmodifiableSet(ss);
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88 return visibleSnapshot;
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92 public boolean isActive(ILayer layer) {
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93 synchronized (this) {
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94 return visible.contains(layer);
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99 public void deactivate(ILayer layer) {
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100 boolean deactivated = false;
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101 synchronized (this) {
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102 deactivated = visible.remove(layer);
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105 synchronized (this) {
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106 visibleSnapshot = null;
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108 for (ILayersEditorListener listener : listeners) {
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109 listener.layerDeactivated(layer);
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115 public void activate(ILayer layer) {
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116 boolean activated = false;
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117 synchronized (this) {
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118 activated = visible.add(layer);
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121 synchronized (this) {
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122 visibleSnapshot = null;
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124 for (ILayersEditorListener listener : listeners) {
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125 listener.layerActivated(layer);
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131 public void addLayer(ILayer layer) {
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132 boolean added = false;
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133 synchronized (this) {
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134 added = all.add(layer);
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137 synchronized (this) {
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138 allSnapshot = null;
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140 for (ILayersEditorListener listener : listeners) {
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141 listener.layerAdded(layer);
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147 public void removeLayer(ILayer layer) {
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148 boolean removed = false;
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149 synchronized (this) {
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150 removed = all.remove(layer);
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151 visible.remove(layer);
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154 synchronized (this) {
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155 allSnapshot = null;
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156 visibleSnapshot = null;
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158 for (ILayersEditorListener listener : listeners) {
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159 listener.layerRemoved(layer);
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165 public void addListener(ILayersEditorListener listener) {
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166 listeners.add(listener);
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170 public void removeListener(ILayersEditorListener listener) {
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171 listeners.remove(listener);
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175 public boolean getIgnoreFocusSettings() {
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176 return ignoreFocusSettings;
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180 public void setIgnoreFocusSettings(boolean value) {
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181 boolean changed = ignoreFocusSettings != value;
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182 ignoreFocusSettings = value;
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184 for (ILayersEditorListener listener : listeners) {
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185 listener.ignoreFocusChanged(value);
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191 public boolean getIgnoreVisibilitySettings() {
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192 return ignoreVisibilitySettings;
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196 public void setIgnoreVisibilitySettings(boolean value) {
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197 boolean changed = ignoreVisibilitySettings != value;
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198 ignoreVisibilitySettings = value;
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200 for (ILayersEditorListener listener : listeners) {
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201 listener.ignoreVisibilityChanged(value);
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