1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.collections4.junit;
19
20 import java.io.Serializable;
21 import java.util.Comparator;
22
23 public final class ObjectToStringComparator implements Comparator<Object>, Serializable {
24
25 /**
26 * Singleton instance.
27 */
28 public static final ObjectToStringComparator INSTANCE = new ObjectToStringComparator();
29
30 private static final long serialVersionUID = 1L;
31
32 @Override
33 public int compare(final Object o1, final Object o2) {
34 if (o1 == null && o2 == null) {
35 return 0;
36 }
37 if (o1 == null) {
38 return 1;
39 }
40 if (o2 == null) {
41 return -1;
42 }
43 return o1.toString().compareTo(o2.toString());
44 }
45 }
46