Java
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;20import org.checkerframework.checker.nullness.qual.Nullable;21
22/**
23* An unhashable object to be used in testing as values in our collections.
24*
25* @author Regina O'Dell
26*/
27@GwtCompatible
28public class UnhashableObject implements Comparable<UnhashableObject> {29private final int value;30
31public UnhashableObject(int value) {32this.value = value;33}34
35@Override36public boolean equals(@Nullable Object object) {37if (object instanceof UnhashableObject) {38UnhashableObject that = (UnhashableObject) object;39return this.value == that.value;40}41return false;42}43
44@Override45public int hashCode() {46throw new UnsupportedOperationException();47}48
49// needed because otherwise Object.toString() calls hashCode()50@Override51public String toString() {52return "DontHashMe" + value;53}54
55@Override56public int compareTo(UnhashableObject o) {57return (this.value < o.value) ? -1 : (this.value > o.value) ? 1 : 0;58}59}
60