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;
020import org.checkerframework.checker.nullness.qual.Nullable;
021
022/**
023 * An unhashable object to be used in testing as values in our collections.
024 *
025 * @author Regina O'Dell
026 */
027@GwtCompatible
028public class UnhashableObject implements Comparable<UnhashableObject> {
029  private final int value;
030
031  public UnhashableObject(int value) {
032    this.value = value;
033  }
034
035  @Override
036  public boolean equals(@Nullable Object object) {
037    if (object instanceof UnhashableObject) {
038      UnhashableObject that = (UnhashableObject) object;
039      return this.value == that.value;
040    }
041    return false;
042  }
043
044  @Override
045  public int hashCode() {
046    throw new UnsupportedOperationException();
047  }
048
049  // needed because otherwise Object.toString() calls hashCode()
050  @Override
051  public String toString() {
052    return "DontHashMe" + value;
053  }
054
055  @Override
056  public int compareTo(UnhashableObject o) {
057    return (this.value < o.value) ? -1 : (this.value > o.value) ? 1 : 0;
058  }
059}