/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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 org.glassfish.jersey.internal.guava;

import java.util.Map.Entry;
import java.util.Objects;

A notification of the removal of a single entry. The key and/or value may be null if they were
already garbage collected.

Like other Map.Entry instances associated with CacheBuilder, this class holds strong references to the key and value, regardless of the type of references the cache may be using. 
Author:
Charles Fry
Since:
10.0/**
 * A notification of the removal of a single entry. The key and/or value may be null if they were
 * already garbage collected.
 * <p>
 * <p>Like other {@code Map.Entry} instances associated with {@code CacheBuilder}, this class holds
 * strong references to the key and value, regardless of the type of references the cache may be
 * using.
 *
 * @author Charles Fry
 * @since 10.0
 */
final class RemovalNotification<K, V> implements Entry<K, V> {
    private static final long serialVersionUID = 0;
    private final K key;
    private final V value;

    RemovalNotification(K key, V value, RemovalCause cause) {
        this.key = key;
        this.value = value;
    }

    @Override
    public K getKey() {
        return key;
    }

    @Override
    public V getValue() {
        return value;
    }

    @Override
    public final V setValue(V value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean equals(Object object) {
        if (object instanceof Entry) {
            Entry<?, ?> that = (Entry<?, ?>) object;
            return Objects.equals(this.getKey(), that.getKey())
                    && Objects.equals(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 {key}={value}.
/**
     * Returns a string representation of the form <code>{key}={value}</code>.
     */
    @Override
    public String toString() {
        return getKey() + "=" + getValue();
    }
}