1 /**
2 * Copyright 2005-2012 The Kuali Foundation
3 *
4 * Licensed under the Educational Community License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.opensource.org/licenses/ecl2.php
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.kuali.rice.krms.framework.engine.expression;
17
18 import java.util.Comparator;
19
20 /**
21 *
22 * For creating custom ComparisonOperator.
23 *
24 * @link ComparisonOperator
25 *
26 * @author Kuali Rice Team (rice.collab@kuali.org)
27 */
28 public interface EngineComparatorExtension<A> extends Comparator<A> {
29
30 /**
31 *
32 * @param lhs
33 * @param rhs
34 * @return int where 0 is equals - is less than and + is greater than
35 */
36 public int compare(A lhs, A rhs);
37
38 /**
39 * Return Object created from the value passed in.
40 *
41 * @param s
42 * @return
43 */
44 // A coerce(String s);
45
46 /**
47 *
48 * @param lhs
49 * @param rhs
50 * @return able to compare lhs and rhs
51 */
52 boolean canCompare(Object lhs, Object rhs);
53 }