package org.moparscape.msc.gs.connection.codec;
import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoder;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;
import org.moparscape.msc.gs.connection.LSPacket;
import org.moparscape.msc.gs.util.Logger;
/**
* Encodes the high level <code>LSPacket</code> class into the proper protocol
* data required for transmission.
*/
public class LSProtocolEncoder implements ProtocolEncoder {
/**
* Releases all resources used by this encoder.
*
* @param session
* The IO session
*/
public void dispose(IoSession session) {
}
/**
* Converts a <code>LSPacket</code> object into the raw data needed for
* transmission.
*
* @param session
* The IO session associated with the packet
* @param message
* A <code>LSPacket</code> to encode
* @param out
* The output stream to which to write the data
*/
public void encode(IoSession session, Object message,
ProtocolEncoderOutput out) {
if (!(message instanceof LSPacket)) {
Logger.error(new Exception("Wrong packet type! "
+ message.toString()));
return;
}
LSPacket p = (LSPacket) message;
byte[] data = p.getData();
int packetLength = data.length;
ByteBuffer buffer;
if (!p.isBare()) {
buffer = ByteBuffer.allocate(data.length + 13);
packetLength += 9;
buffer.putInt(packetLength);
buffer.put((byte) p.getID());
buffer.putLong(p.getUID());
} else {
buffer = ByteBuffer.allocate(data.length);
}
buffer.put(data, 0, data.length);
buffer.flip();
out.write(buffer);
}
}