To create Primed TNT I need to have an "Igniter"

 

EntityTNTPrimed(World worldIn, double x, double y, double z, EntityLivingBase igniter)

 

But what happens if I dont have an entity to associate the event with? This needs to be called within onNeighborBlockChange

 

How would I go around this?

If the TNT wasn't ignited by an entity, just pass

null

.

 

If you look at the doc comment or usages of

EntityTNTPrimed#getTntPlacedBy

(which returns the

EntityLivingBase

passed to the constructor), you'll see that

null

is a valid and expected return value.

Other project I was working with named a paramter like that as "[ x ]OrNull" e.g. "igniterOrNull" to make it clear that it was a parameter that wouldn't throw NPE if you passed in null, as it was intended to handle such things.

I didn't know about @Nullable. Not that I'm surprised.

 

The thing I was talking about was a function parameter not a return value on an interface.

 

For example, using the OP's method:

public void EntityTNTPrimed(World worldIn, double x, double y, double z, EntityLivingBase igniterOrNull) {...}

 

Is there a cleaner way of doing it there?  The point I was trying to raise is "MCP could note this kind of stuff and it would be useful." (I just don't care how)

Ah, neat.

Learn something new every day.

Poked around in C# (my Unity3D project) seeing if it had nullable parameters and it does, but for the simple types (e.g.

someMethod(int? nullableIntVar){}

) but not for the complex types, as complex objects can already be assumed to be capable of being null.  So the project I was working in that had a "[ x ]OrNull" parameter was justified in making the name indicate that the method could handle null values being pased vs. a "this object must not be null" method.

 

I should note that the .NET version for Unity is garbage: 2.0, updating to a newer version is under the "research" category on the roadmap.  I.e. not even on the "long term development" track yet, much less the next two releases.