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 /** 20 * An unhashable object to be used in testing as values in our collections. 21 * 22 * <p>This class is GWT compatible. 23 * 24 * @author Regina O'Dell 25 */ 26 public class UnhashableObject implements Comparable<UnhashableObject> { 27 private final int value; 28 29 public UnhashableObject(int value) { 30 this.value = value; 31 } 32 33 @Override public boolean equals(Object object) { 34 if (object instanceof UnhashableObject) { 35 UnhashableObject that = (UnhashableObject) object; 36 return this.value == that.value; 37 } 38 return false; 39 } 40 41 @Override public int hashCode() { 42 throw new UnsupportedOperationException(); 43 } 44 45 // needed because otherwise Object.toString() calls hashCode() 46 @Override public String toString() { 47 return "DontHashMe" + value; 48 } 49 50 @Override 51 public int compareTo(UnhashableObject o) { 52 return (this.value < o.value) ? -1 : (this.value > o.value) ? 1 : 0; 53 } 54 } 55
