X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.ui%2Fsrc%2Forg%2Fsimantics%2Fui%2FDoubleClickExtensionManager.java;fp=bundles%2Forg.simantics.ui%2Fsrc%2Forg%2Fsimantics%2Fui%2FDoubleClickExtensionManager.java;h=a93e61b2e2cf4e63ab3676f615ec001798b9501c;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

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
index 000000000..a93e61b2e
--- /dev/null
+++ b/bundles/org.simantics.ui/src/org/simantics/ui/DoubleClickExtensionManager.java
@@ -0,0 +1,138 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.ui;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.IExtension;
+import org.eclipse.core.runtime.IExtensionPoint;
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;
+import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;
+import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;
+import org.eclipse.core.runtime.dynamichelpers.IFilter;
+import org.simantics.ui.internal.Activator;
+import org.simantics.utils.strings.StringUtils;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class DoubleClickExtensionManager implements IExtensionChangeHandler {
+
+    private final static String                NAMESPACE    = Activator.PLUGIN_ID;
+
+    private final static String                EP_NAME      = "doubleClick";
+
+    private ExtensionTracker                   tracker;
+
+    private IDoubleClickExtension[]            extensions   = new IDoubleClickExtension[0];
+
+    private static DoubleClickExtensionManager INSTANCE;
+
+
+    public static synchronized DoubleClickExtensionManager getInstance() {
+        if (INSTANCE == null)
+            INSTANCE = new DoubleClickExtensionManager();
+        return INSTANCE;
+    }
+
+    public static synchronized void dispose() {
+        if (INSTANCE != null) {
+            INSTANCE.close();
+            INSTANCE = null;
+        }
+    }
+
+
+    private DoubleClickExtensionManager() {
+        tracker = new ExtensionTracker();
+
+        // Cache defined actions
+        IExtensionPoint expt = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE, EP_NAME);
+        loadExtensions(expt.getConfigurationElements());
+
+        // Start tracking for new and removed extensions
+        IFilter filter = ExtensionTracker.createExtensionPointFilter(expt);
+        tracker.registerHandler(this, filter);
+    }
+
+    private void close() {
+        tracker.close();
+        tracker = null;
+        extensions = new IDoubleClickExtension[0];
+    }
+
+    public IDoubleClickExtension[] getExtensions() {
+        return extensions;
+    }
+
+    private void loadExtensions(IConfigurationElement[] elements) {
+        Set<IDoubleClickExtension> newExtensions = new HashSet<IDoubleClickExtension>(Arrays.asList(extensions));
+
+        for (IConfigurationElement el : elements) {
+            String name = StringUtils.safeString(el.getAttribute("name"));
+            double priority = 0;
+            try {
+                String p = el.getAttribute("priority");
+                if (p != null) {
+                    priority = Double.parseDouble(p);
+                }
+            } catch (NumberFormatException e) {
+            }
+            IDoubleClickExtension ext = new DoubleClickExtension(el, name, priority);
+
+            // Start tracking the new extension object, its removal will be notified of
+            // with removeExtension(extension, Object[]).
+            tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);
+
+            newExtensions.add(ext);
+        }
+
+        // Sort in descending priority order
+        List<IDoubleClickExtension> unsorted = new ArrayList<IDoubleClickExtension>(newExtensions);
+        Collections.sort(unsorted, new Comparator<IDoubleClickExtension>() {
+            @Override
+            public int compare(IDoubleClickExtension o1, IDoubleClickExtension o2) {
+                return Double.compare(o2.getPriority(), o1.getPriority());
+            }
+        });
+
+        // Atomic assignment
+        this.extensions = unsorted.toArray(new IDoubleClickExtension[unsorted.size()]);
+    }
+
+    @Override
+    public void addExtension(IExtensionTracker tracker, IExtension extension) {
+        loadExtensions(extension.getConfigurationElements());
+    }
+
+    @Override
+    public void removeExtension(IExtension extension, Object[] objects) {
+        Set<IDoubleClickExtension> newExtensions = new HashSet<IDoubleClickExtension>(Arrays.asList(extensions));
+
+        for (Object o : objects) {
+            tracker.unregisterObject(extension, o);
+            newExtensions.remove(o);
+        }
+
+        // Atomic assignment
+        this.extensions = newExtensions.toArray(new IDoubleClickExtension[newExtensions.size()]);
+    }
+
+}