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.CumulativeProtocolDecoder;
import org.apache.mina.filter.codec.ProtocolDecoderOutput;
import org.moparscape.msc.gs.connection.LSPacket;
/**
* A decoder for the LS protocol. Parses the incoming data from an IoSession and
* outputs it as a <code>LSPacket</code> object.
*/
public class LSProtocolDecoder extends CumulativeProtocolDecoder {
/**
* Releases the buffer used by the given session.
*
* @param session
* The session for which to release the buffer
* @throws Exception
* if failed to dispose all resources
*/
public void dispose(IoSession session) throws Exception {
super.dispose(session);
}
/**
* Parses the data in the provided byte buffer and writes it to
* <code>out</code> as a <code>LSPacket</code>.
*
* @param session
* The IoSession the data was read from
* @param in
* The buffer
* @param out
* The decoder output stream to which to write the
* <code>LSPacket</code>
* @return Whether enough data was available to create a packet
*/
protected boolean doDecode(IoSession session, ByteBuffer in,
ProtocolDecoderOutput out) {
if (in.remaining() >= 13) {
int length = in.getInt();
if (length <= in.remaining()) {
byte[] payload = new byte[length - 9];
int id = in.getUnsigned();
long uid = in.getLong();
in.get(payload);
out.write(new LSPacket(session, id, uid, payload));
return true;
} else {
in.rewind();
return false;
}
}
return false;
}
}