Packet Handler

package advancedscience.core;

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.network.INetworkManager;
import net.minecraft.network.packet.Packet250CustomPayload;
import net.minecraft.world.World;
import advancedscience.research.TileEntityResearchTable;
import cpw.mods.fml.common.network.IPacketHandler;
import cpw.mods.fml.common.network.PacketDispatcher;
import cpw.mods.fml.common.network.Player;

public class PacketHandler implements IPacketHandler {

    @Override
    public void onPacketData(INetworkManager manager,
                    Packet250CustomPayload packet, Player player) {

            if (packet.channel.equals("DanielScienceGui")) {
                    handleGui(packet, player);
            }
    }

    private void handleGui(Packet250CustomPayload packet, Player player) {
        DataInputStream inputStream = new DataInputStream(new ByteArrayInputStream(packet.data));

           EntityPlayer entityPlayer = (EntityPlayer) player;
           World world = entityPlayer.worldObj;

        if(world.isRemote) System.out.println("@World is remote.");
        if(!world.isRemote) System.out.println("@World is not remote.");

           int xCoord;
           int yCoord;
           int zCoord;
           String action;

           try {
                   xCoord = inputStream.readInt();
                   yCoord = inputStream.readInt();
                   zCoord = inputStream.readInt();
                   action = inputStream.readUTF();
           } catch (IOException e) {
                   e.printStackTrace();
                   return;
           }
           System.out.println(xCoord + " " + yCoord + " " + zCoord + " " + action);
           System.out.println(action.substring(0, 5));

           if(action.substring(0, 5).equals("rsach")){
               TileEntityResearchTable tileEntity = (TileEntityResearchTable)world.getBlockTileEntity(xCoord, yCoord, zCoord);
               tileEntity.recieveResearchCommand(Integer.parseInt(action.substring(action.length() - 3, action.length())));
           }

            if(!world.isRemote){
                PacketDispatcher.sendPacketToServer(packet);
            }
    }
}