/*=============================================================================#
 # Copyright (c) 2012, 2021 Original NatTable authors and others.
 # 
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License 2.0 which is available at
 # https://www.eclipse.org/legal/epl-2.0.
 # 
 # SPDX-License-Identifier: EPL-2.0
 # 
 # Contributors:
 #     Original NatTable authors and others - initial API and implementation
 #=============================================================================*/

package org.eclipse.statet.ecommons.waltable.config;

import java.util.Comparator;


@SuppressWarnings("unchecked")
public class DefaultComparator implements Comparator<Object> {

	private static DefaultComparator singleton;

	public static final DefaultComparator getInstance() {
		if (singleton == null) {
			singleton= new DefaultComparator();
		}
		return singleton;
	}

	@Override
	@SuppressWarnings("rawtypes")
	public int compare(final Object o1, final Object o2) {
		if (o1 == null) {
			if (o2 == null) {
				return 0;
			} else {
				return -1;
			}
		} else if (o2 == null) {
			return 1;
		} else if (o1 instanceof Comparable && o2 instanceof Comparable) {
			return ((Comparable) o1).compareTo(o2);
		} else {
			return o1.toString().compareTo(o2.toString());
		}
	}

}