//Receiving the packet
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
    ChannelBuffer buf = (ChannelBuffer) e.getMessage();
    byte header = buf.readByte();
    ph.getMessage(header).parse(nh.getSH(), (ChannelBuffer) e.getMessage(), e.getChannel());
}

//Which is handled here:
package network.packet.out;

import handling.ServerHandler;

import java.util.ArrayList;

import network.packet.out.messages.AskDecksMessage;
import network.packet.out.messages.AskMatchesMessage;
import network.packet.out.messages.CreateRoomMessage;
import network.packet.out.messages.EnterRoomMessage;
import network.packet.out.messages.ExitGameMessage;
import network.packet.out.messages.LeaveRoomMessage;
import network.packet.out.messages.LoginMessage;

public class PacketHandler {

    private ArrayList<PacketMessage> messages = new ArrayList<PacketMessage>();

    public PacketHandler() {
        register();
    }

    public void register() {
        messages.add(new LoginMessage());
        messages.add(new ExitGameMessage());
        messages.add(new AskDecksMessage());
        messages.add(new CreateRoomMessage());
        messages.add(new AskMatchesMessage());
        messages.add(new LeaveRoomMessage());
        messages.add(new EnterRoomMessage());
    }

    //Here
    public PacketMessage getMessage(int i) {
        return messages.get(i);
    }
}

//Which makes it go to an alternative class, which all have PacketMessage als implementation (with the method Parse):
package network.packet.out.messages;

import handling.ServerHandler;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;

import network.packet.in.ServerPacketCreator;
import network.packet.out.PacketMessage;

public class AskMatchesMessage implements PacketMessage{

    @Override
    public void parse(ServerHandler sh, ChannelBuffer buf, Channel c) {

        sh.getChannelServer().get(c).write(ServerPacketCreator.sendMatches(sh.getMatchHandler().getAllMatches()));

    }

}