src/main/java/org/apache/sling/commons/cache/impl/MapDeligate.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.sling.commons.cache.impl;

import java.util.Collection;
import java.util.Map;
import java.util.Set;

import org.apache.sling.commons.cache.api.Cache;

public class MapDeligate<K, V> implements Map<K, V> {

	private Cache<V> cache;

	public MapDeligate(Cache<V> cache) {
		this.cache = cache;
	}

	public void clear() {
		cache.clear();
	}

	public boolean containsKey(Object key) {
		return cache.containsKey((java.lang.String) key);
	}

	public boolean containsValue(Object value) {
		throw new UnsupportedOperationException("This map is lookup only.");
	}

	public Set<Entry<K, V>> entrySet() {
		throw new UnsupportedOperationException("This map is lookup only.");
	}

	public V get(Object key) {
		return cache.get((String) key);
	}

	public boolean isEmpty() {
		return false;
	}

	public Set<K> keySet() {
		throw new UnsupportedOperationException("This map is lookup only.");
	}

	public V put(K key, V value) {
		return cache.put((String) key, value);
	}

	public void putAll(Map<? extends K, ? extends V> m) {
		throw new UnsupportedOperationException(
				"This map is singly add only, use an iterator or loop.");
	}

	public int size() {
		throw new UnsupportedOperationException("This map is lookup only.");
	}

	public V remove(Object key) {
		V value = cache.get((String) key);
		cache.remove((String) key);
		return value;
	}

	public Collection<V> values() {
		throw new UnsupportedOperationException("This map is lookup only.");
	}

}