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/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.compare.internal;
import org.eclipse.compare.CompareConfiguration;
import org.eclipse.compare.IViewerCreator;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.widgets.Composite;
/**
* Creates <code>Viewer</code>s from an <code>IConfigurationElement</code>.
*/
public class ViewerDescriptor implements IViewerDescriptor {
private final static String CLASS_ATTRIBUTE= "class"; //$NON-NLS-1$
private final static String EXTENSIONS_ATTRIBUTE= "extensions"; //$NON-NLS-1$
private final static String LABEL_ATTRIBUTE = "label"; //$NON-NLS-1$
private IConfigurationElement fConfiguration;
private IViewerCreator fViewerCreator;
private Class fViewerClass;
public ViewerDescriptor(IConfigurationElement config) {
fConfiguration= config;
}
public Viewer createViewer(Viewer currentViewer, Composite parent, CompareConfiguration mp) {
if (currentViewer != null && currentViewer.getClass() == fViewerClass) {
//System.out.println("reused viewer: " + currentViewer.getClass().getName());
return currentViewer;
}
if (fViewerCreator == null) {
try {
fViewerCreator= (IViewerCreator) fConfiguration.createExecutableExtension(CLASS_ATTRIBUTE);
} catch (CoreException e) {
CompareUIPlugin.log(e);
}
}
if (fViewerCreator != null) {
// If we are going to return a new viewer, we want to preemptively deregister
// any handlers to avoid the logging of conflict warnings
if (currentViewer != null) {
CompareHandlerService[] compareHandlerService = (CompareHandlerService[]) Utilities.getAdapter(currentViewer, CompareHandlerService[].class);
if (compareHandlerService != null) {
for (int i = 0; i < compareHandlerService.length; i++) {
compareHandlerService[i].dispose();
}
}
}
Viewer viewer= fViewerCreator.createViewer(parent, mp);
if (viewer != null)
fViewerClass= viewer.getClass();
return viewer;
}
return null;
}
public String getExtension() {
return fConfiguration.getAttribute(EXTENSIONS_ATTRIBUTE);
}
String getLabel() {
return fConfiguration.getAttribute(LABEL_ATTRIBUTE);
}
}
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