EntryProxy.java

/*
 * Copyright 2015 Ben Manes. All Rights Reserved.
 *
 * 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.benmanes.caffeine.jcache;

import java.util.AbstractMap.SimpleImmutableEntry;

import javax.cache.Cache;

/**
 * An implementation of JSR-107 {@link Cache.Entry}.
 *
 * @author ben.manes@gmail.com (Ben Manes)
 */
public final class EntryProxy<K, V> extends SimpleImmutableEntry<K, V>
    implements Cache.Entry<K, V> {
  private static final long serialVersionUID = 1L;

  EntryProxy(K key, V value) {
    super(key, value);
  }

  @Override
  public <T> T unwrap(Class<T> clazz) {
    if (!clazz.isInstance(this)) {
      throw new IllegalArgumentException("Class " + clazz + " is unknown to this implementation");
    }
    @SuppressWarnings("unchecked")
    T castedEntry = (T) this;
    return castedEntry;
  }
}