ContactViewerComparator.java

/*******************************************************************************
 * Copyright (c) 2011 Kai Toedter 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:
 *     Kai Toedter - initial API and implementation
 ******************************************************************************/

package com.toedter.e4.demo.contacts.swt.views;

import com.toedter.e4.demo.contacts.generic.model.Contact;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;

class ContactViewerComparator extends ViewerComparator {

	@Override
	public int compare(final Viewer viewer, final Object obj1, final Object obj2) {

		if (obj1 instanceof Contact && obj2 instanceof Contact) {
			String lastName1 = ((Contact) obj1).getLastName();
			String lastName2 = ((Contact) obj2).getLastName();
			if (lastName1 == null) {
				lastName1 = "";
			}
			if (lastName2 == null) {
				lastName2 = "";
			}
			return lastName1.compareTo(lastName2);
		} else {
			throw new IllegalArgumentException("Can only compare two Contacts.");
		}

	}
}