plugins/org.eclipse.epsilon.dt.epackageregistryexplorer/src/org/eclipse/epsilon/dt/epackageregistryexplorer/AlphabeticalSorter.java

/*******************************************************************************
 * Copyright (c) 2008 The University of York.
 * 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:
 *     Dimitrios Kolovos - initial API and implementation
 ******************************************************************************/
package org.eclipse.epsilon.dt.epackageregistryexplorer;

import org.eclipse.jface.viewers.ContentViewer;
import org.eclipse.jface.viewers.IBaseLabelProvider;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerSorter;

public class AlphabeticalSorter extends ViewerSorter 
{ 
	
    @Override
	public int category(Object element) {
    	return 0;
    }

    @Override
	public int compare(Viewer viewer, Object e1, Object e2) {
		String name1, name2;
		if (viewer == null || !(viewer instanceof ContentViewer)) {
			name1 = e1.toString();
			name2 = e2.toString();
		} 
		else {
			IBaseLabelProvider prov = ((ContentViewer) viewer).getLabelProvider();
			if (prov instanceof ILabelProvider) {
				ILabelProvider lprov = (ILabelProvider) prov;
				name1 = lprov.getText(e1);
				name2 = lprov.getText(e2);
			} 
			else {
				name1 = e1.toString();
				name2 = e2.toString();
			}
		}
		if (name1 == null)
			name1 = "";
		if (name2 == null)
			name2 = "";
		return collator.compare(name1, name2);
	}
    
    
}