OpenGuiMessage.java

package thatmartinguy.jeopardy.network;

import io.netty.buffer.ByteBuf;
import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.util.math.BlockPos;
import net.minecraftforge.fml.common.network.simpleimpl.IMessage;
import net.minecraftforge.fml.common.network.simpleimpl.IMessageHandler;
import net.minecraftforge.fml.common.network.simpleimpl.MessageContext;
import thatmartinguy.jeopardy.Jeopardy;

public class OpenGuiMessage implements IMessage
{
    private int guiID = -1;
    private int posX;
    private int posY;
    private int posZ;

    public OpenGuiMessage() {}

    public OpenGuiMessage(int id, Entity entity)
    {
        this(id, (int) entity.posX, (int) entity.posY, (int) entity.posZ);
    }

    public OpenGuiMessage(int id, BlockPos pos)
    {
        this(id, pos.getX(), pos.getY(), pos.getZ());
    }

    public OpenGuiMessage(int id, int posX, int posY, int posZ)
    {
        this.guiID = id;
        this.posX = posX;
        this.posY = posY;
        this.posZ = posZ;
    }

    @Override
    public void fromBytes(ByteBuf buf)
    {
        guiID = buf.readInt();
        posX = buf.readInt();
        posY = buf.readInt();
        posZ = buf.readInt();
    }

    @Override
    public void toBytes(ByteBuf buf)
    {
        buf.writeInt(guiID);
        buf.writeInt(posX);
        buf.writeInt(posY);
        buf.writeInt(posZ);
    }

    public static class Handler implements IMessageHandler<OpenGuiMessage, IMessage>
    {
        @Override
        public IMessage onMessage(OpenGuiMessage message, MessageContext ctx)
        {
            Jeopardy.proxy.getThreadListener(ctx).addScheduledTask(() ->
            {
               final EntityPlayer player = Jeopardy.proxy.getPlayer(ctx);

               player.openGui(Jeopardy.instance, message.guiID, player.world, message.posX, message.posY, message.posZ);
            });

            return null;
        }
    }
}