[1.9]Add a variable to a player

[Ironfists]

I have to create a new variable for the player class. It's an integer that goes up by one every tick and goes back to 0 when we right click.

 

In forge 1.8 I guess I would use IExtendedProperties but it's not there anymore and it's replaced by capabilities. Can someone tell me how can I do it, and if I have to use capabilities, make an example of how to do it because I saw some examples of this new thing but they were too complicated

[Ironfists]

So I came up with this code, it seems to work but I'd like to ask you if everything is correct.

 

IOffHandAttack.class

public interface IOffHandAttack
{
public int getTicksSinceLastSwing2();
public void setTicksSinceLastSwing2(int amount);
public void tick();
}

 

EventHandler.class

public class EventHandler 
{
    @CapabilityInject(IOffHandAttack.class)
    private static final Capability<IOffHandAttack> OFFHAND_CAP = null;

@SubscribeEvent
public void onAttack(AttackEntityEvent event) 
{
    	final IOffHandAttack atk = event.getEntityPlayer().getCapability(OFFHAND_CAP, null);
    	atk.setTicksSinceLastSwing2(0);
}

@SubscribeEvent
public void onLivingUpdate(LivingUpdateEvent event) 
{
	if(event.getEntityLiving() instanceof EntityPlayer)
	{
    	final IOffHandAttack atk = event.getEntityLiving().getCapability(OFFHAND_CAP, null);
    	atk.tick();
	}
}

    @SubscribeEvent
    public void onEntityConstruct(AttachCapabilitiesEvent.Entity evt)
    {
        evt.addCapability(new ResourceLocation(Reference.MOD_ID, "IOffHandAttack"), new ICapabilitySerializable<NBTPrimitive>()
        {
            IOffHandAttack inst = OFFHAND_CAP.getDefaultInstance();
            @Override
            public boolean hasCapability(Capability<?> capability, EnumFacing facing) {
                return capability == OFFHAND_CAP;
            }

            @Override
            public <T> T getCapability(Capability<T> capability, EnumFacing facing) {
                return capability == OFFHAND_CAP ? OFFHAND_CAP.<T>cast(inst) : null;
            }

            @Override
            public NBTPrimitive serializeNBT() {
                return (NBTPrimitive)OFFHAND_CAP.getStorage().writeNBT(OFFHAND_CAP, inst, null);
            }

            @Override
            public void deserializeNBT(NBTPrimitive nbt) {
            	OFFHAND_CAP.getStorage().readNBT(OFFHAND_CAP, inst, null, nbt);
            }
        });    
    }
}

 

Storage.class

public class Storage implements IStorage<IOffHandAttack>
{
@Override
public NBTBase writeNBT(Capability<IOffHandAttack> capability, IOffHandAttack instance, EnumFacing side) {
	return new NBTTagInt(instance.getTicksSinceLastSwing2());
}

@Override
public void readNBT(Capability<IOffHandAttack> capability, IOffHandAttack instance, EnumFacing side, NBTBase nbt) {
	instance.setTicksSinceLastSwing2(((NBTPrimitive)nbt).getInt());
}
}

 

DefaultImpl.class

public class DefaultImpl implements IOffHandAttack
{
private int ticksSinceLastSwing2;

@Override
public int getTicksSinceLastSwing2() {

	return ticksSinceLastSwing2;
}

@Override
public void setTicksSinceLastSwing2(int amount) {
	this.ticksSinceLastSwing2 = amount;	
}

@Override
public void tick() {
	this.ticksSinceLastSwing2++;
}
}

 

CommonProxy.class

public class CommonProxy 
{	

 public void preInit(FMLPreInitializationEvent e) 
 {
              CapabilityManager.INSTANCE.register(IOffHandAttack.class, new Storage(), DefaultImpl.class);
         }

}

 

[Ernio]

Looks fine to me

 

(You could rename AttachCaps method, since it is not exacly EntityConstructing event)

[Ironfists]

Ok, I found that pretty strange that setting the value will also change the server side value without using packets.

 

Also, how would you explain how this method works?

  @Override
            public <T> T getCapability(Capability<T> capability, EnumFacing facing) {
                return capability == OFFHAND_CAP ? OFFHAND_CAP.<T>cast(inst) : null;
            }

 

I know the 1 line "if-else" thing but I don't understand the whole idea of this method

[Ernio]

Ok, I found that pretty strange that setting the value will also change the server side value without using packets.

 

This is impossible. You must be calling setter method from server.

 

Also, how would you explain how this method works?

  @Override
            public <T> T getCapability(Capability<T> capability, EnumFacing facing) {
                return capability == OFFHAND_CAP ? OFFHAND_CAP.<T>cast(inst) : null;
            }

 

Method itself - it is used to return Capability attached to given thing (ItemStack, Entity, Tile, etc.) when you ask for it. Basically - you ask for "OFFHAND_CAP", it will give you instance of it assigned to thing you ask capability for. Pretty much whole point of CapabilityProvider class, which apparently is NOT even needed (I read it somewhere).

Just look at callbacks bruh