1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.ui;
14 import org.eclipse.core.runtime.CoreException;
15 import org.eclipse.core.runtime.IConfigurationElement;
16 import org.simantics.db.exception.DatabaseException;
17 import org.simantics.utils.ui.ExceptionUtils;
19 public class DoubleClickExtension implements IDoubleClickExtension {
22 * A fallback action for replacing {@link #cachedAction} if action
23 * instantiation fails.
25 private static final IDoubleClickAction NO_ACTION = new IDoubleClickAction() {
27 public void doubleClickEvent(DoubleClickEvent e) throws DatabaseException {
31 private final IConfigurationElement config;
33 private final String name;
35 private final double priority;
37 private IDoubleClickAction cachedAction;
39 DoubleClickExtension(IConfigurationElement config, String name, double priority) {
42 this.priority = priority;
46 public String getName() {
51 public double getPriority() {
56 public synchronized IDoubleClickAction getAction() {
57 if (cachedAction == null) {
59 cachedAction = (IDoubleClickAction) config.createExecutableExtension("class");
60 } catch (CoreException e) {
61 ExceptionUtils.logError("Failed to instantiate " + config.getName()
62 + " extension with name \"" + config.getAttribute("name") + "\": "
64 // This prevents informing of an error in the extension.
65 cachedAction = NO_ACTION;
72 public String toString() {
73 return "DoubleClickExtension [name=" + name + ", class=" + config.getAttribute("class") + ", priority=" + priority + "]";