001/* 002 * Copyright (C) 2009 The Guava Authors 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package com.google.common.collect.testing; 018 019import com.google.common.annotations.GwtCompatible; 020 021/** 022 * An unhashable object to be used in testing as values in our collections. 023 * 024 * @author Regina O'Dell 025 */ 026@GwtCompatible 027public class UnhashableObject implements Comparable<UnhashableObject> { 028 private final int value; 029 030 public UnhashableObject(int value) { 031 this.value = value; 032 } 033 034 @Override 035 public boolean equals(Object object) { 036 if (object instanceof UnhashableObject) { 037 UnhashableObject that = (UnhashableObject) object; 038 return this.value == that.value; 039 } 040 return false; 041 } 042 043 @Override 044 public int hashCode() { 045 throw new UnsupportedOperationException(); 046 } 047 048 // needed because otherwise Object.toString() calls hashCode() 049 @Override 050 public String toString() { 051 return "DontHashMe" + value; 052 } 053 054 @Override 055 public int compareTo(UnhashableObject o) { 056 return (this.value < o.value) ? -1 : (this.value > o.value) ? 1 : 0; 057 } 058}