001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.commons.jcs.jcache;
020
021import javax.cache.integration.CacheLoader;
022import javax.cache.integration.CacheLoaderException;
023import java.util.HashMap;
024import java.util.Map;
025
026public class NoLoader<K, V> implements CacheLoader<K, V>
027{
028    public static final NoLoader INSTANCE = new NoLoader();
029
030    private NoLoader()
031    {
032        // no-op
033    }
034
035    @Override
036    public V load(K key) throws CacheLoaderException
037    {
038        return null;
039    }
040
041    @Override
042    public Map<K, V> loadAll(final Iterable<? extends K> keys) throws CacheLoaderException
043    {
044        final Map<K, V> entries = new HashMap<K, V>();
045        for (final K k : keys)
046        {
047            entries.put(k, null);
048        }
049        return entries;
050    }
051}