/*
* Copyright 2008 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 java.util;
import static java.util.Utility.equalsWithNullCheck;
/**
* Basic {@link Map.Entry} implementation that implements hashCode, equals, and
* toString.
*/
abstract class AbstractMapEntry<K, V> implements Map.Entry<K, V> {
@Override
public final boolean equals(Object other) {
if (other instanceof Map.Entry) {
Map.Entry<?, ?> entry = (Map.Entry<?, ?>) other;
if (equalsWithNullCheck(getKey(), entry.getKey())
&& equalsWithNullCheck(getValue(), entry.getValue())) {
return true;
}
}
return false;
}
/**
* Calculate the hash code using Sun's specified algorithm.
*/
@Override
public final int hashCode() {
int keyHash = 0;
int valueHash = 0;
if (getKey() != null) {
keyHash = getKey().hashCode();
}
if (getValue() != null) {
valueHash = getValue().hashCode();
}
return keyHash ^ valueHash;
}
@Override
public final String toString() {
return getKey() + "=" + getValue();
}
}