Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.ui/src/org/simantics/ui/DoubleClickExtension.java b/bundles/org.simantics.ui/src/org/simantics/ui/DoubleClickExtension.java
new file mode 100644 (file)
index 0000000..3407f21
--- /dev/null
+++ b/bundles/org.simantics.ui/src/org/simantics/ui/DoubleClickExtension.java
@@ -0,0 +1,76 @@
+/*******************************************************************************\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 org.eclipse.core.runtime.CoreException;\r
+import org.eclipse.core.runtime.IConfigurationElement;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.utils.ui.ExceptionUtils;\r
+\r
+public class DoubleClickExtension implements IDoubleClickExtension {\r
+\r
+    /**\r
+     * A fallback action for replacing {@link #cachedAction} if action\r
+     * instantiation fails.\r
+     */\r
+    private static final IDoubleClickAction NO_ACTION = new IDoubleClickAction() {\r
+        @Override\r
+        public void doubleClickEvent(DoubleClickEvent e) throws DatabaseException {\r
+        }\r
+    };\r
+\r
+    private final IConfigurationElement config;\r
+\r
+    private final String                name;\r
+\r
+    private final double                priority;\r
+\r
+    private IDoubleClickAction          cachedAction;\r
+\r
+    DoubleClickExtension(IConfigurationElement config, String name, double priority) {\r
+        this.config = config;\r
+        this.name = name;\r
+        this.priority = priority;\r
+    }\r
+\r
+    @Override\r
+    public String getName() {\r
+        return name;\r
+    }\r
+\r
+    @Override\r
+    public double getPriority() {\r
+        return priority;\r
+    }\r
+\r
+    @Override\r
+    public synchronized IDoubleClickAction getAction() {\r
+        if (cachedAction == null) {\r
+            try {\r
+                cachedAction = (IDoubleClickAction) config.createExecutableExtension("class");\r
+            } catch (CoreException e) {\r
+                ExceptionUtils.logError("Failed to instantiate " + config.getName()\r
+                        + " extension with name \"" + config.getAttribute("name") + "\": "\r
+                        + e.getMessage(), e);\r
+                // This prevents informing of an error in the extension.\r
+                cachedAction = NO_ACTION;\r
+            }\r
+        }\r
+        return cachedAction;\r
+    }\r
+\r
+    @Override\r
+    public String toString() {\r
+        return "DoubleClickExtension [name=" + name + ", class=" + config.getAttribute("class") + ", priority=" + priority + "]";\r
+    }\r
+\r
+}\r