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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.jcs3.jcache;
20  
21  import javax.cache.Cache;
22  import javax.cache.processor.MutableEntry;
23  
24  public class JCSMutableEntry<K, V> implements MutableEntry<K, V>
25  {
26      private final Cache<K, V> cache;
27      private final K key;
28  
29      public JCSMutableEntry(final Cache<K, V> cache, final K key)
30      {
31          this.cache = cache;
32          this.key = key;
33      }
34  
35      @Override
36      public boolean exists()
37      {
38          return cache.containsKey(key);
39      }
40  
41      @Override
42      public void remove()
43      {
44          cache.remove(key);
45      }
46  
47      @Override
48      public void setValue(final V value)
49      {
50          cache.put(key, value);
51      }
52  
53      @Override
54      public K getKey()
55      {
56          return key;
57      }
58  
59      @Override
60      public V getValue()
61      {
62          return cache.get(key);
63      }
64  
65      @Override
66      public <T> T unwrap(final Class<T> clazz)
67      {
68          if (clazz.isInstance(this))
69          {
70              return clazz.cast(this);
71          }
72          throw new IllegalArgumentException(clazz.getName() + " not supported in unwrap");
73      }
74  }