guava

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/*
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 * Copyright (C) 2009 The Guava Authors
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 * http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.google.common.collect.testing;
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import com.google.common.annotations.GwtCompatible;
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import org.checkerframework.checker.nullness.qual.Nullable;
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/**
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 * An unhashable object to be used in testing as values in our collections.
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 *
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 * @author Regina O'Dell
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 */
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@GwtCompatible
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public class UnhashableObject implements Comparable<UnhashableObject> {
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  private final int value;
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  public UnhashableObject(int value) {
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    this.value = value;
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  }
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  @Override
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  public boolean equals(@Nullable Object object) {
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    if (object instanceof UnhashableObject) {
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      UnhashableObject that = (UnhashableObject) object;
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      return this.value == that.value;
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    }
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    return false;
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  }
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  @Override
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  public int hashCode() {
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    throw new UnsupportedOperationException();
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  }
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  // needed because otherwise Object.toString() calls hashCode()
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  @Override
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  public String toString() {
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    return "DontHashMe" + value;
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  }
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  @Override
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  public int compareTo(UnhashableObject o) {
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    return (this.value < o.value) ? -1 : (this.value > o.value) ? 1 : 0;
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  }
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}
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