1 /*
2  * Copyright (C) 2009 The Guava Authors
3  *
4  * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
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 
17 package com.google.common.collect.testing;
18 
19 import com.google.common.annotations.GwtCompatible;
20 
21 /**
22  * An unhashable object to be used in testing as values in our collections.
23  *
24  * @author Regina O'Dell
25  */
26 @GwtCompatible
27 public class UnhashableObject implements Comparable<UnhashableObject> {
28   private final int value;
29 
30   public UnhashableObject(int value) {
31     this.value = value;
32   }
33 
34   @Override public boolean equals(Object object) {
35     if (object instanceof UnhashableObject) {
36       UnhashableObject that = (UnhashableObject) object;
37       return this.value == that.value;
38     }
39     return false;
40   }
41 
42   @Override public int hashCode() {
43     throw new UnsupportedOperationException();
44   }
45 
46   // needed because otherwise Object.toString() calls hashCode()
47   @Override public String toString() {
48     return "DontHashMe" + value;
49   }
50 
51   @Override
52   public int compareTo(UnhashableObject o) {
53     return (this.value < o.value) ? -1 : (this.value > o.value) ? 1 : 0;
54   }
55 }
56