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.directory.mitosis.operation;
21
22
23 import java.io.ByteArrayInputStream;
24 import java.io.ByteArrayOutputStream;
25 import java.io.IOException;
26 import java.io.ObjectInputStream;
27 import java.io.ObjectOutputStream;
28 import java.io.ObjectStreamConstants;
29
30 import org.apache.directory.server.schema.registries.Registries;
31
32
33 /**
34 * Encodes {@link Operation}s to <tt>byte[]</tt> and vice versa so an
35 * {@link Operation} can be transferred via TCP/IP communication.
36 *
37 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
38 */
39 public class OperationCodec
40 {
41 public OperationCodec()
42 {
43 }
44
45
46 /**
47 * Transforms the specified {@link Operation} into a byte array.
48 */
49 public byte[] encode( Operation op )
50 {
51 ByteArrayOutputStream bout = new ByteArrayOutputStream();
52 try
53 {
54 ObjectOutputStream out = new ObjectOutputStream( bout );
55 out.useProtocolVersion( ObjectStreamConstants.PROTOCOL_VERSION_2 );
56 Operation.serialize( op, out );
57 out.flush();
58 out.close();
59 }
60 catch ( IOException e )
61 {
62 throw ( InternalError ) new InternalError().initCause( e );
63 }
64 catch ( ClassNotFoundException cnfe )
65 {
66 throw ( InternalError ) new InternalError().initCause( cnfe );
67 }
68
69 return bout.toByteArray();
70 }
71
72
73 /**
74 * Transforms the specified byte array into an {@link Operation}.
75 */
76 public Operation decode( Registries registries, byte[] data )
77 {
78 ObjectInputStream in;
79
80 try
81 {
82 in = new ObjectInputStream( new ByteArrayInputStream( data ) );
83 return Operation.deserialize( registries, in );
84 }
85 catch ( IOException e )
86 {
87 throw ( InternalError ) new InternalError().initCause( e );
88 }
89 catch ( ClassNotFoundException e )
90 {
91 throw ( InternalError ) new InternalError().initCause( e );
92 }
93 }
94 }