001 /** 002 * 003 * Copyright 2004 Protique Ltd 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 **/ 018 019 package org.activemq.io.impl; 020 import java.io.DataInput; 021 import java.io.IOException; 022 import org.activemq.message.Packet; 023 import org.activemq.message.WireFormatInfo; 024 025 /** 026 * Reads a ConnnectionInfo object from a Stream 027 * 028 * @version $Revision: 1.1.1.1 $ 029 */ 030 public class WireFormatInfoReader extends AbstractPacketReader { 031 032 AbstractDefaultWireFormat wireFormat; 033 034 WireFormatInfoReader(){ 035 } 036 037 WireFormatInfoReader(AbstractDefaultWireFormat format){ 038 this.wireFormat = format; 039 } 040 /** 041 * Return the type of Packet 042 * 043 * @return integer representation of the type of Packet 044 */ 045 public int getPacketType() { 046 return Packet.WIRE_FORMAT_INFO; 047 } 048 049 /** 050 * @return a new Packet instance 051 */ 052 public Packet createPacket() { 053 return new WireFormatInfo(); 054 } 055 056 /** 057 * build a Packet instance from the data input stream 058 * 059 * @param packet A Packet object 060 * @param dataIn the data input stream to build the packet from 061 * @throws IOException 062 */ 063 public void buildPacket(Packet packet, DataInput dataIn) throws IOException { 064 065 // The Magic has to match. 066 for( int i=0; i < WireFormatInfo.MAGIC.length; i++ ) { 067 if( dataIn.readByte() != WireFormatInfo.MAGIC[i]) { 068 throw new IOException("Invalid WireFormatInfo packet."); 069 } 070 } 071 072 super.buildPacket(packet, dataIn); 073 WireFormatInfo info = (WireFormatInfo) packet; 074 info.setVersion(dataIn.readInt()); 075 if (wireFormat != null){ 076 wireFormat.setCurrentWireFormatVersion(info.getVersion()); 077 } 078 } 079 }