/*
* Copyright (C) 2007 Google Inc. Licensed under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law
* or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
package com.github.droidfu.com.google.common.collect;
import java.util.Map.Entry;
import com.github.droidfu.com.google.common.base.Objects;
/**
* Implementation of the {@code equals}, {@code hashCode}, and {@code toString}
* methods of {@code Entry}.
*
* @author Jared Levy
*/
abstract class AbstractMapEntry<K, V> implements Entry<K, V> {
public abstract K getKey();
public abstract V getValue();
public V setValue(V value) {
throw new UnsupportedOperationException();
}
@Override
public boolean equals(Object object) {
if (object instanceof Entry) {
Entry<?, ?> that = (Entry<?, ?>) object;
return Objects.equal(this.getKey(), that.getKey())
&& Objects.equal(this.getValue(), that.getValue());
}
return false;
}
@Override
public int hashCode() {
K k = getKey();
V v = getValue();
return ((k == null) ? 0 : k.hashCode()) ^ ((v == null) ? 0 : v.hashCode());
}
/**
* Returns a string representation of the form <code>{key}={value}</code>.
*/
@Override
public String toString() {
return getKey() + "=" + getValue();
}
}