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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  package org.apache.http.impl.client.cache;
28  
29  import java.io.IOException;
30  import java.io.InputStream;
31  import java.io.ObjectInputStream;
32  import java.io.ObjectOutputStream;
33  import java.io.OutputStream;
34  
35  import org.apache.http.annotation.Contract;
36  import org.apache.http.annotation.ThreadingBehavior;
37  import org.apache.http.client.cache.HttpCacheEntry;
38  import org.apache.http.client.cache.HttpCacheEntrySerializationException;
39  import org.apache.http.client.cache.HttpCacheEntrySerializer;
40  
41  /**
42   * {@link HttpCacheEntrySerializer} implementation that uses the default (native)
43   * serialization.
44   *
45   * @see java.io.Serializable
46   *
47   * @since 4.1
48   */
49  @Contract(threading = ThreadingBehavior.IMMUTABLE)
50  public class DefaultHttpCacheEntrySerializer implements HttpCacheEntrySerializer {
51  
52      @Override
53      public void writeTo(final HttpCacheEntry cacheEntry, final OutputStream os) throws IOException {
54          final ObjectOutputStream oos = new ObjectOutputStream(os);
55          try {
56              oos.writeObject(cacheEntry);
57          } finally {
58              oos.close();
59          }
60      }
61  
62      @Override
63      public HttpCacheEntry readFrom(final InputStream is) throws IOException {
64          final ObjectInputStream ois = new ObjectInputStream(is);
65          try {
66              return (HttpCacheEntry) ois.readObject();
67          } catch (final ClassNotFoundException ex) {
68              throw new HttpCacheEntrySerializationException("Class not found: " + ex.getMessage(), ex);
69          } finally {
70              ois.close();
71          }
72      }
73  
74  }