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/*
* Licensed Materials - Property of IBM,
* WebSphere Studio Workbench
* (c) Copyright IBM Corp 2000, 2001
*/
package org.eclipse.compare.internal;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.compare.*;
import org.eclipse.jface.viewers.Viewer;
/**
* Creates <code>Viewer</code>s from an <code>IConfigurationElement</code>.
*/
public class ViewerDescriptor implements IViewerDescriptor {
private final static String CLASS_ATTRIBUTE= "class";
private final static String EXTENSIONS_ATTRIBUTE= "extensions";
private IConfigurationElement fConfiguration;
private IViewerCreator fViewerCreator;
public ViewerDescriptor(IConfigurationElement config) {
fConfiguration= config;
}
public Viewer createViewer(Viewer currentViewer, Composite parent, CompareConfiguration mp) {
String className= fConfiguration.getAttribute(CLASS_ATTRIBUTE);
if (currentViewer != null && currentViewer.getClass().getName().equals(className)) {
return currentViewer;
}
if (fViewerCreator == null) {
try {
fViewerCreator= (IViewerCreator) fConfiguration.createExecutableExtension(CLASS_ATTRIBUTE);
} catch (CoreException e) {
}
}
if (fViewerCreator != null) {
Viewer viewer= fViewerCreator.createViewer(parent, mp);
//if (viewer != null && currentViewer != null && viewer.getClass() == currentViewer.getClass())
// return currentViewer;
return viewer;
}
return null;
}
public String getExtension() {
return fConfiguration.getAttribute(EXTENSIONS_ATTRIBUTE);
}
}
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