Source code: org/activemq/io/impl/WireFormatInfoReader.java
1 /**
2 *
3 * Copyright 2004 Protique Ltd
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 **/
18
19 package org.activemq.io.impl;
20 import java.io.DataInput;
21 import java.io.IOException;
22 import org.activemq.message.Packet;
23 import org.activemq.message.WireFormatInfo;
24
25 /**
26 * Reads a ConnnectionInfo object from a Stream
27 *
28 * @version $Revision: 1.1.1.1 $
29 */
30 public class WireFormatInfoReader extends AbstractPacketReader {
31
32 AbstractDefaultWireFormat wireFormat;
33
34 WireFormatInfoReader(){
35 }
36
37 WireFormatInfoReader(AbstractDefaultWireFormat format){
38 this.wireFormat = format;
39 }
40 /**
41 * Return the type of Packet
42 *
43 * @return integer representation of the type of Packet
44 */
45 public int getPacketType() {
46 return Packet.WIRE_FORMAT_INFO;
47 }
48
49 /**
50 * @return a new Packet instance
51 */
52 public Packet createPacket() {
53 return new WireFormatInfo();
54 }
55
56 /**
57 * build a Packet instance from the data input stream
58 *
59 * @param packet A Packet object
60 * @param dataIn the data input stream to build the packet from
61 * @throws IOException
62 */
63 public void buildPacket(Packet packet, DataInput dataIn) throws IOException {
64
65 // The Magic has to match.
66 for( int i=0; i < WireFormatInfo.MAGIC.length; i++ ) {
67 if( dataIn.readByte() != WireFormatInfo.MAGIC[i]) {
68 throw new IOException("Invalid WireFormatInfo packet.");
69 }
70 }
71
72 super.buildPacket(packet, dataIn);
73 WireFormatInfo info = (WireFormatInfo) packet;
74 info.setVersion(dataIn.readInt());
75 if (wireFormat != null){
76 wireFormat.setCurrentWireFormatVersion(info.getVersion());
77 }
78 }
79 }