1 /*
2 * Copyright 2006 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.ole.gl;
17
18 /**
19 * This class is used to compare objects with one another
20 */
21 public class ObjectHelper {
22 protected ObjectHelper() {
23 }
24
25 /**
26 * Returns true if object on left side is equal to object on right side
27 *
28 * @param lhs object on left side of equation
29 * @param rhs object on right side of equation
30 * @return true if both lhs and rhs are null or if lhs.equals(rhs)
31 */
32 static public boolean isEqual(Object lhs, Object rhs) {
33 return (null == lhs && null == rhs) || (null != lhs && lhs.equals(rhs));
34 }
35
36 /**
37 * Return true if object on left side is one of the items in array of objects
38 *
39 * @param lhs object on left side of equation
40 * @param rhs object on right side of equation
41 * @return false if rhs is null. true if isEqual(lhs, rhs[i]) for any ith element of rhs.
42 */
43 static public boolean isOneOf(Object lhs, Object[] rhs) {
44 if (rhs == null)
45 return false;
46
47 // simple linear search. Arrays.binarySearch isn't appropriate
48 // because the elements of rhs aren't in natural order.
49 for (int i = 0; i < rhs.length; i++) {
50 if (isEqual(lhs, rhs[i])) {
51 return true;
52 }
53 }
54
55 return false;
56 }
57 }