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.jcs3.jcache;
020
021import java.util.HashMap;
022import java.util.Map;
023
024import javax.cache.integration.CacheLoader;
025import javax.cache.integration.CacheLoaderException;
026
027public class NoLoader<K, V> implements CacheLoader<K, V>
028{
029    public static final NoLoader<?, ?> INSTANCE = new NoLoader<>();
030
031    private NoLoader()
032    {
033        // no-op
034    }
035
036    @Override
037    public V load(final K key) throws CacheLoaderException
038    {
039        return null;
040    }
041
042    @Override
043    public Map<K, V> loadAll(final Iterable<? extends K> keys) throws CacheLoaderException
044    {
045        final Map<K, V> entries = new HashMap<>();
046        for (final K k : keys)
047        {
048            entries.put(k, null);
049        }
050        return entries;
051    }
052}