Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.ui/src/org/simantics/ui/workbench/PerspectiveContextBindingManager.java b/bundles/org.simantics.ui/src/org/simantics/ui/workbench/PerspectiveContextBindingManager.java
new file mode 100644 (file)
index 0000000..4da7b36
--- /dev/null
+++ b/bundles/org.simantics.ui/src/org/simantics/ui/workbench/PerspectiveContextBindingManager.java
@@ -0,0 +1,111 @@
+/*******************************************************************************\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.workbench;\r
+\r
+import java.util.Arrays;\r
+import java.util.Collections;\r
+import java.util.List;\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.datastructures.MapList;\r
+\r
+public class PerspectiveContextBindingManager implements IExtensionChangeHandler {\r
+\r
+    private final static String                           NAMESPACE  = Activator.PLUGIN_ID;\r
+\r
+    private final static String                           EP_NAME    = "perspectiveContextBinding";\r
+\r
+    private ExtensionTracker                              tracker;\r
+\r
+    private MapList<String, IPerspectiveContextExtension> extensions = new MapList<String, IPerspectiveContextExtension>();\r
+\r
+    private static PerspectiveContextBindingManager       INSTANCE;\r
+\r
+    public static synchronized PerspectiveContextBindingManager getInstance() {\r
+        if (INSTANCE == null)\r
+            INSTANCE = new PerspectiveContextBindingManager();\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
+    private PerspectiveContextBindingManager() {\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 MapList<String, IPerspectiveContextExtension>();\r
+    }\r
+\r
+    public synchronized List<IPerspectiveContextExtension> getExtensions(String perspectiveId) {\r
+        List<IPerspectiveContextExtension> exts = extensions.getValues(perspectiveId);\r
+        if (exts == null)\r
+            return Arrays.asList();\r
+        return Collections.unmodifiableList(exts);\r
+    }\r
+\r
+    private synchronized void loadExtensions(IConfigurationElement[] elements) {\r
+        for (IConfigurationElement el : elements) {\r
+            String perspectiveId = el.getAttribute("perspectiveId");\r
+            String contextId = el.getAttribute("contextIds");\r
+            String[] contextIds = contextId.split(",");\r
+\r
+            IPerspectiveContextExtension ext = new IPerspectiveContextExtension.Stub(perspectiveId, contextIds);\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
+            extensions.add(perspectiveId, ext);\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public void addExtension(IExtensionTracker tracker, IExtension extension) {\r
+        loadExtensions(extension.getConfigurationElements());\r
+    }\r
+\r
+    @Override\r
+    public synchronized void removeExtension(IExtension extension, Object[] objects) {\r
+       \r
+        for (Object o : objects) {\r
+            IPerspectiveContextExtension ext = (IPerspectiveContextExtension) o;\r
+            tracker.unregisterObject(extension, ext);\r
+            extensions.remove(ext.getPerspectiveId(), ext);\r
+        }\r
+\r
+    }\r
+\r
+}\r