ContainerSynchronised.java

package codechicken.core.inventory;

import codechicken.lib.packet.PacketCustom;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.inventory.Container;
import net.minecraft.item.ItemStack;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public abstract class ContainerSynchronised extends ContainerExtended {
    private ArrayList<IContainerSyncVar> syncVars = new ArrayList<IContainerSyncVar>();

    public abstract PacketCustom createSyncPacket();

    @Override
    public final void detectAndSendChanges() {
        super.detectAndSendChanges();

        for (int i = 0; i < syncVars.size(); i++) {
            IContainerSyncVar var = syncVars.get(i);
            if (var.changed()) {
                PacketCustom packet = createSyncPacket();
                packet.writeByte(i);
                var.writeChange(packet);
                sendContainerPacket(packet);
                var.reset();
            }
        }
    }

    @Override
    public void sendContainerAndContentsToPlayer(Container container, List<ItemStack> list, List<EntityPlayerMP> playerCrafters) {
        super.sendContainerAndContentsToPlayer(container, list, playerCrafters);
        for (int i = 0; i < syncVars.size(); i++) {
            IContainerSyncVar var = syncVars.get(i);
            PacketCustom packet = createSyncPacket();
            packet.writeByte(i);
            var.writeChange(packet);
            var.reset();
            for (EntityPlayerMP player : playerCrafters) {
                packet.sendToPlayer(player);
            }
        }
    }

    public void addSyncVar(IContainerSyncVar var) {
        syncVars.add(var);
    }

    @Override
    public final void handleOutputPacket(PacketCustom packet) {
        syncVars.get(packet.readUByte()).readChange(packet);
    }

    public List<IContainerSyncVar> getSyncedVars() {
        return Collections.unmodifiableList(syncVars);
    }
}