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.jcs3.jcache;
20
21 import java.util.HashMap;
22 import java.util.Map;
23
24 import javax.cache.integration.CacheLoader;
25 import javax.cache.integration.CacheLoaderException;
26
27 public class NoLoader<K, V> implements CacheLoader<K, V>
28 {
29 public static final NoLoader<?, ?> INSTANCE = new NoLoader<>();
30
31 private NoLoader()
32 {
33 // no-op
34 }
35
36 @Override
37 public V load(final K key) throws CacheLoaderException
38 {
39 return null;
40 }
41
42 @Override
43 public Map<K, V> loadAll(final Iterable<? extends K> keys) throws CacheLoaderException
44 {
45 final Map<K, V> entries = new HashMap<>();
46 for (final K k : keys)
47 {
48 entries.put(k, null);
49 }
50 return entries;
51 }
52 }