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
17package com.google.common.collect.testing;
18
19import 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
27public 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