70 lines
1.7 KiB
Java
70 lines
1.7 KiB
Java
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/*
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* Copyright (C) 2007 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;
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import java.util.Map.Entry;
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import javax.annotation.Nullable;
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import com.google.common.annotations.GwtCompatible;
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import com.google.common.base.Objects;
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/**
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* Implementation of the {@code equals}, {@code hashCode}, and {@code toString}
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* methods of {@code Entry}.
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*
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* @author Jared Levy
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*/
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@GwtCompatible
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abstract class AbstractMapEntry<K, V> implements Entry<K, V> {
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@Override
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public abstract K getKey();
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@Override
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public abstract V getValue();
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@Override
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public V setValue(V value) {
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throw new UnsupportedOperationException();
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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 Entry) {
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Entry<?, ?> that = (Entry<?, ?>) object;
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return Objects.equal(this.getKey(), that.getKey()) && Objects.equal(this.getValue(), that.getValue());
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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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K k = getKey();
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V v = getValue();
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return ((k == null) ? 0 : k.hashCode()) ^ ((v == null) ? 0 : v.hashCode());
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}
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/**
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* Returns a string representation of the form {@code {key}={value}}.
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*/
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@Override
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public String toString() {
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return getKey() + "=" + getValue();
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}
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}
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