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 import 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 28 public class UnhashableObject implements Comparable<UnhashableObject> { 29 private final int value; 30 UnhashableObject(int value)31 public UnhashableObject(int value) { 32 this.value = value; 33 } 34 35 @Override equals(@ullable Object object)36 public boolean equals(@Nullable Object object) { 37 if (object instanceof UnhashableObject) { 38 UnhashableObject that = (UnhashableObject) object; 39 return this.value == that.value; 40 } 41 return false; 42 } 43 44 @Override hashCode()45 public int hashCode() { 46 throw new UnsupportedOperationException(); 47 } 48 49 // needed because otherwise Object.toString() calls hashCode() 50 @Override toString()51 public String toString() { 52 return "DontHashMe" + value; 53 } 54 55 @Override compareTo(UnhashableObject o)56 public int compareTo(UnhashableObject o) { 57 return (this.value < o.value) ? -1 : (this.value > o.value) ? 1 : 0; 58 } 59 } 60