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