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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.commons.jcs.jcache;
20  
21  import javax.cache.integration.CacheLoader;
22  import javax.cache.integration.CacheLoaderException;
23  import java.util.HashMap;
24  import java.util.Map;
25  
26  public class NoLoader<K, V> implements CacheLoader<K, V>
27  {
28      public static final NoLoader INSTANCE = new NoLoader();
29  
30      private NoLoader()
31      {
32          // no-op
33      }
34  
35      @Override
36      public V load(K key) throws CacheLoaderException
37      {
38          return null;
39      }
40  
41      @Override
42      public Map<K, V> loadAll(final Iterable<? extends K> keys) throws CacheLoaderException
43      {
44          final Map<K, V> entries = new HashMap<K, V>();
45          for (final K k : keys)
46          {
47              entries.put(k, null);
48          }
49          return entries;
50      }
51  }