Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.g2d / src / org / simantics / g2d / layers / SimpleLayers.java

diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/layers/SimpleLayers.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/layers/SimpleLayers.java
new file mode 100644 (file)
index 0000000..19393f4
--- /dev/null
+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/layers/SimpleLayers.java
@@ -0,0 +1,206 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.g2d.layers;\r
+\r
+import java.util.Collections;\r
+import java.util.Comparator;\r
+import java.util.Set;\r
+import java.util.TreeSet;\r
+import java.util.concurrent.CopyOnWriteArrayList;\r
+\r
+/**\r
+ * @author Antti Villberg\r
+ */\r
+public class SimpleLayers implements ILayersEditor {\r
+\r
+    private static final Comparator<ILayer> LAYER_COMPARATOR = new Comparator<ILayer>() {\r
+        @Override\r
+        public int compare(ILayer o1, ILayer o2) {\r
+            return o1.getName().compareTo(o2.getName());\r
+        }\r
+    };\r
+\r
+    private Set<ILayer>                                 all                      = new TreeSet<ILayer>(LAYER_COMPARATOR);\r
+    private volatile Set<ILayer>                        allSnapshot;\r
+\r
+    private Set<ILayer>                                 visible                  = new TreeSet<ILayer>(LAYER_COMPARATOR);\r
+    private volatile Set<ILayer>                        visibleSnapshot;\r
+\r
+    private CopyOnWriteArrayList<ILayersEditorListener> listeners                = new CopyOnWriteArrayList<ILayersEditorListener>();\r
+\r
+    private boolean                                     ignoreFocusSettings      = false;\r
+\r
+    private boolean                                     ignoreVisibilitySettings = false;\r
+\r
+    public SimpleLayers() {\r
+    }\r
+\r
+    public SimpleLayers(String... content) {\r
+        for (String s : content) {\r
+            ILayer layer = new SimpleLayer(s);\r
+            all.add(layer);\r
+            visible.add(layer);\r
+        }\r
+        allSnapshot = null;\r
+        visibleSnapshot = null;\r
+    }\r
+\r
+    @Override\r
+    public Set<ILayer> getLayers() {\r
+        // Double-checked locking idiom: http://en.wikipedia.org/wiki/Double-checked_locking\r
+        // Works with acquire/release semantics for volatile\r
+        // Broken under Java 1.4 and earlier semantics for volatile\r
+        if (allSnapshot == null) {\r
+            synchronized (this) {\r
+                if (allSnapshot == null) {\r
+                    TreeSet<ILayer> ss = new TreeSet<ILayer>(LAYER_COMPARATOR);\r
+                    ss.addAll(all);\r
+                    allSnapshot = Collections.unmodifiableSet(ss);\r
+                }\r
+            }\r
+        }\r
+        return allSnapshot;\r
+    }\r
+\r
+    @Override\r
+    public Set<ILayer> getVisibleLayers() {\r
+        // Double-checked locking idiom: http://en.wikipedia.org/wiki/Double-checked_locking\r
+        // Works with acquire/release semantics for volatile\r
+        // Broken under Java 1.4 and earlier semantics for volatile\r
+        if (visibleSnapshot == null) {\r
+            synchronized (this) {\r
+                if (visibleSnapshot == null) {\r
+                    TreeSet<ILayer> ss = new TreeSet<ILayer>(LAYER_COMPARATOR);\r
+                    ss.addAll(visible);\r
+                    visibleSnapshot = Collections.unmodifiableSet(ss);\r
+                }\r
+            }\r
+        }\r
+        return visibleSnapshot;\r
+    }\r
+\r
+    @Override\r
+    public boolean isActive(ILayer layer) {\r
+        synchronized (this) {\r
+            return visible.contains(layer);\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public void deactivate(ILayer layer) {\r
+        boolean deactivated = false;\r
+        synchronized (this) {\r
+            deactivated = visible.remove(layer);\r
+        }\r
+        if (deactivated) {\r
+            synchronized (this) {\r
+                visibleSnapshot = null;\r
+            }\r
+            for (ILayersEditorListener listener : listeners) {\r
+                listener.layerDeactivated(layer);\r
+            }\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public void activate(ILayer layer) {\r
+        boolean activated = false;\r
+        synchronized (this) {\r
+            activated = visible.add(layer);\r
+        }\r
+        if (activated) {\r
+            synchronized (this) {\r
+                visibleSnapshot = null;\r
+            }\r
+            for (ILayersEditorListener listener : listeners) {\r
+                listener.layerActivated(layer);\r
+            }\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public void addLayer(ILayer layer) {\r
+        boolean added = false;\r
+        synchronized (this) {\r
+            added = all.add(layer);\r
+        }\r
+        if (added) {\r
+            synchronized (this) {\r
+                allSnapshot = null;\r
+            }\r
+            for (ILayersEditorListener listener : listeners) {\r
+                listener.layerAdded(layer);\r
+            }\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public void removeLayer(ILayer layer) {\r
+        boolean removed = false;\r
+        synchronized (this) {\r
+            removed = all.remove(layer);\r
+            visible.remove(layer);\r
+        }\r
+        if (removed) {\r
+            synchronized (this) {\r
+                allSnapshot = null;\r
+                visibleSnapshot = null;\r
+            }\r
+            for (ILayersEditorListener listener : listeners) {\r
+                listener.layerRemoved(layer);\r
+            }\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public void addListener(ILayersEditorListener listener) {\r
+        listeners.add(listener);\r
+    }\r
+\r
+    @Override\r
+    public void removeListener(ILayersEditorListener listener) {\r
+        listeners.remove(listener);\r
+    }\r
+\r
+    @Override\r
+    public boolean getIgnoreFocusSettings() {\r
+        return ignoreFocusSettings;\r
+    }\r
+\r
+    @Override\r
+    public void setIgnoreFocusSettings(boolean value) {\r
+        boolean changed = ignoreFocusSettings != value;\r
+        ignoreFocusSettings = value;\r
+        if (changed) {\r
+            for (ILayersEditorListener listener : listeners) {\r
+                listener.ignoreFocusChanged(value);\r
+            }\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public boolean getIgnoreVisibilitySettings() {\r
+        return ignoreVisibilitySettings;\r
+    }\r
+\r
+    @Override\r
+    public void setIgnoreVisibilitySettings(boolean value) {\r
+        boolean changed = ignoreVisibilitySettings != value;\r
+        ignoreVisibilitySettings = value;\r
+        if (changed) {\r
+            for (ILayersEditorListener listener : listeners) {\r
+                listener.ignoreVisibilityChanged(value);\r
+            }\r
+        }\r
+    }\r
+\r
+}\r