001/**
002 * Copyright 2005-2016 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.kuali.rice.krms.framework.engine.expression;
017
018import java.util.Comparator;
019
020/**
021 *
022 * For creating custom ComparisonOperator.
023 *
024 * @link ComparisonOperator
025 *
026 * @author Kuali Rice Team (rice.collab@kuali.org)
027 */
028public interface EngineComparatorExtension<A> extends Comparator<A> {
029
030    /**
031     *
032     * @param lhs
033     * @param rhs
034     * @return int where 0 is equals - is less than and + is greater than
035     */
036    public int compare(A lhs, A rhs);
037
038    /**
039     * Return Object created from the value passed in.
040     *
041     * @param s
042     * @return
043     */
044//    A coerce(String s);
045
046    /**
047     *
048     * @param lhs
049     * @param rhs
050     * @return able to compare lhs and rhs
051     */
052    boolean canCompare(Object lhs, Object rhs);
053}