MethodComparator.java

/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.kernel.util;

import java.lang.reflect.Method;

import java.util.Comparator;

/**
 * @author Shuyang Zhou
 * @author Brian Wing Shun Chan
 */
public class MethodComparator implements Comparator<Method> {

	@Override
	public int compare(Method method1, Method method2) {
		String name1 = method1.getName();
		String name2 = method2.getName();

		int value = name1.compareTo(name2);

		if (value != 0) {
			return value;
		}

		Class<?>[] parameterTypes1 = method1.getParameterTypes();
		Class<?>[] parameterTypes2 = method2.getParameterTypes();

		int index = 0;

		while ((index < parameterTypes1.length) &&
			   (index < parameterTypes2.length)) {

			Class<?> parameterType1 = parameterTypes1[index];
			Class<?> parameterType2 = parameterTypes2[index];

			String parameterTypeName1 = parameterType1.getName();
			String parameterTypeName2 = parameterType2.getName();

			value = parameterTypeName1.compareTo(parameterTypeName2);

			if (value != 0) {
				return value;
			}

			index++;
		}

		if (index < (parameterTypes1.length - 1)) {
			return -1;
		}
		else {
			return 1;
		}
	}

}