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.extras.loader;
020
021import javax.cache.configuration.Factory;
022import javax.cache.integration.CacheLoader;
023import javax.cache.integration.CacheLoaderException;
024import java.util.HashMap;
025import java.util.Map;
026
027public abstract class CacheLoaderAdapter<K, V> implements CacheLoader<K, V>, Factory<CacheLoader<K, V>>
028{
029    @Override
030    public Map<K, V> loadAll(final Iterable<? extends K> keys) throws CacheLoaderException
031    {
032        final Map<K, V> result = new HashMap<>();
033        for (final K k : keys)
034        {
035            final V v = load(k);
036            if (v != null)
037            {
038                result.put(k, v);
039            }
040        }
041        return result;
042    }
043
044    @Override
045    public CacheLoader<K, V> create()
046    {
047        return this;
048    }
049}