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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   */
20  package org.apache.mina.codec.delimited.serialization;
21  
22  
23  import org.apache.mina.codec.IoBuffer;
24  import org.apache.mina.codec.ProtocolDecoderException;
25  import org.apache.mina.codec.delimited.IoBufferDecoder;
26  import org.apache.thrift.TBase;
27  import org.apache.thrift.TDeserializer;
28  import org.apache.thrift.TException;
29  import org.apache.thrift.protocol.TBinaryProtocol;
30  
31  /**
32   * Decode {@link IoBuffer} into Thrift messages.
33   * 
34   * @param <OUTPUT> the base type for decoded messages.
35   * 
36   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
37   */
38  public class ThriftMessageDecoder<OUTPUT extends TBase<?, ?>> extends IoBufferDecoder<OUTPUT> {
39      private final TDeserializer deserializer = new TDeserializer(new TBinaryProtocol.Factory());
40  
41      private final Class<OUTPUT> clazz;
42  
43      /**
44       * Create thrift message decoder
45       * 
46       * @param clazz the base class for decoded messages
47       */
48      public ThriftMessageDecoder(Class<OUTPUT> clazz) {
49          super();
50          this.clazz = clazz;
51      }
52  
53      public static <L extends TBase<?, ?>> ThriftMessageDecoder<L> newInstance(Class<L> clazz) {
54          return new ThriftMessageDecoder<L>(clazz);
55      }
56  
57      /**
58       * {@inheritDoc}
59       */
60      @Override
61      public OUTPUT decode(IoBuffer input) {
62          OUTPUT object;
63          try {
64              byte array[] = new byte[input.remaining()];
65              input.get(array);
66              object = clazz.newInstance();
67              deserializer.deserialize(object, array);
68              return object;
69          } catch (TException e) {
70              throw new ProtocolDecoderException(e);
71          } catch (InstantiationException e) {
72              throw new ProtocolDecoderException(e);
73          } catch (IllegalAccessException e) {
74              throw new ProtocolDecoderException(e);
75          }
76      }
77  
78  }