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Kuali Utilities

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/**
 * Copyright 2010-2014 The Kuali Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.opensource.org/licenses/ecl2.php
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.kuali.common.util;

import java.util.HashSet;
import java.util.Set;

public class SetUtils {

	/**
	 * Return a new Set containing only those elements that appear in both a and b
	 */
	public static  Set intersection(Set a, Set b) {
		Set result = new HashSet();
		result.addAll(a);
		result.retainAll(b);
		return result;
	}

	/**
	 * Return a new Set containing all of the elements from both a and b
	 */
	public static  Set union(Set a, Set b) {
		Set result = new HashSet();
		result.addAll(a);
		result.addAll(b);
		return result;
	}

	/**
	 * Return a new Set containing only those elements that appear in a but not b
	 */
	public static  Set difference(Set a, Set b) {
		Set result = new HashSet();
		result.addAll(a);
		result.removeAll(b);
		return result;
	}

}