Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.ui / src / org / simantics / ui / DoubleClickExtensionManager.java

diff --git a/bundles/org.simantics.ui/src/org/simantics/ui/DoubleClickExtensionManager.java b/bundles/org.simantics.ui/src/org/simantics/ui/DoubleClickExtensionManager.java
new file mode 100644 (file)
index 0000000..a93e61b
--- /dev/null
+++ b/bundles/org.simantics.ui/src/org/simantics/ui/DoubleClickExtensionManager.java
@@ -0,0 +1,138 @@
+/*******************************************************************************\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.ui;\r
+\r
+import java.util.ArrayList;\r
+import java.util.Arrays;\r
+import java.util.Collections;\r
+import java.util.Comparator;\r
+import java.util.HashSet;\r
+import java.util.List;\r
+import java.util.Set;\r
+\r
+import org.eclipse.core.runtime.IConfigurationElement;\r
+import org.eclipse.core.runtime.IExtension;\r
+import org.eclipse.core.runtime.IExtensionPoint;\r
+import org.eclipse.core.runtime.Platform;\r
+import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;\r
+import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;\r
+import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;\r
+import org.eclipse.core.runtime.dynamichelpers.IFilter;\r
+import org.simantics.ui.internal.Activator;\r
+import org.simantics.utils.strings.StringUtils;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class DoubleClickExtensionManager implements IExtensionChangeHandler {\r
+\r
+    private final static String                NAMESPACE    = Activator.PLUGIN_ID;\r
+\r
+    private final static String                EP_NAME      = "doubleClick";\r
+\r
+    private ExtensionTracker                   tracker;\r
+\r
+    private IDoubleClickExtension[]            extensions   = new IDoubleClickExtension[0];\r
+\r
+    private static DoubleClickExtensionManager INSTANCE;\r
+\r
+\r
+    public static synchronized DoubleClickExtensionManager getInstance() {\r
+        if (INSTANCE == null)\r
+            INSTANCE = new DoubleClickExtensionManager();\r
+        return INSTANCE;\r
+    }\r
+\r
+    public static synchronized void dispose() {\r
+        if (INSTANCE != null) {\r
+            INSTANCE.close();\r
+            INSTANCE = null;\r
+        }\r
+    }\r
+\r
+\r
+    private DoubleClickExtensionManager() {\r
+        tracker = new ExtensionTracker();\r
+\r
+        // Cache defined actions\r
+        IExtensionPoint expt = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE, EP_NAME);\r
+        loadExtensions(expt.getConfigurationElements());\r
+\r
+        // Start tracking for new and removed extensions\r
+        IFilter filter = ExtensionTracker.createExtensionPointFilter(expt);\r
+        tracker.registerHandler(this, filter);\r
+    }\r
+\r
+    private void close() {\r
+        tracker.close();\r
+        tracker = null;\r
+        extensions = new IDoubleClickExtension[0];\r
+    }\r
+\r
+    public IDoubleClickExtension[] getExtensions() {\r
+        return extensions;\r
+    }\r
+\r
+    private void loadExtensions(IConfigurationElement[] elements) {\r
+        Set<IDoubleClickExtension> newExtensions = new HashSet<IDoubleClickExtension>(Arrays.asList(extensions));\r
+\r
+        for (IConfigurationElement el : elements) {\r
+            String name = StringUtils.safeString(el.getAttribute("name"));\r
+            double priority = 0;\r
+            try {\r
+                String p = el.getAttribute("priority");\r
+                if (p != null) {\r
+                    priority = Double.parseDouble(p);\r
+                }\r
+            } catch (NumberFormatException e) {\r
+            }\r
+            IDoubleClickExtension ext = new DoubleClickExtension(el, name, priority);\r
+\r
+            // Start tracking the new extension object, its removal will be notified of\r
+            // with removeExtension(extension, Object[]).\r
+            tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);\r
+\r
+            newExtensions.add(ext);\r
+        }\r
+\r
+        // Sort in descending priority order\r
+        List<IDoubleClickExtension> unsorted = new ArrayList<IDoubleClickExtension>(newExtensions);\r
+        Collections.sort(unsorted, new Comparator<IDoubleClickExtension>() {\r
+            @Override\r
+            public int compare(IDoubleClickExtension o1, IDoubleClickExtension o2) {\r
+                return Double.compare(o2.getPriority(), o1.getPriority());\r
+            }\r
+        });\r
+\r
+        // Atomic assignment\r
+        this.extensions = unsorted.toArray(new IDoubleClickExtension[unsorted.size()]);\r
+    }\r
+\r
+    @Override\r
+    public void addExtension(IExtensionTracker tracker, IExtension extension) {\r
+        loadExtensions(extension.getConfigurationElements());\r
+    }\r
+\r
+    @Override\r
+    public void removeExtension(IExtension extension, Object[] objects) {\r
+        Set<IDoubleClickExtension> newExtensions = new HashSet<IDoubleClickExtension>(Arrays.asList(extensions));\r
+\r
+        for (Object o : objects) {\r
+            tracker.unregisterObject(extension, o);\r
+            newExtensions.remove(o);\r
+        }\r
+\r
+        // Atomic assignment\r
+        this.extensions = newExtensions.toArray(new IDoubleClickExtension[newExtensions.size()]);\r
+    }\r
+\r
+}\r