com.hazelcast.cache.impl.CacheEntry Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, Hazelcast, Inc. 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.hazelcast.cache.impl;
import javax.cache.Cache;
import java.util.Map;
/**
* Simple {@link javax.cache.Cache.Entry} implementation for wrapping a "key,value" pair.
*
* This implementation is used by {@link javax.cache.integration.CacheWriter}s and
* {@link javax.cache.Cache#iterator()}.
*
* @param the type of key.
* @param the type of value.
* @see javax.cache.integration.CacheWriter
* @see javax.cache.Cache#iterator()
*/
public class CacheEntry
implements Cache.Entry, Map.Entry {
private final K key;
private V value;
public CacheEntry(K key, V value) {
this.key = key;
this.value = value;
}
@Override
public K getKey() {
return key;
}
@Override
public V getValue() {
return value;
}
@Override
public T unwrap(Class clazz) {
if (clazz.isAssignableFrom(((Object) this).getClass())) {
return clazz.cast(this);
}
throw new IllegalArgumentException("Unwrapping to " + clazz + " is not supported by this implementation");
}
@Override
public V setValue(V value) {
throw new UnsupportedOperationException();
}
}