Are blockstates created only once and do they have some kind of index? 1.15.2

[AntonBespoiasov 0]

Creating multiblock system I decided that I will store original blockstate in TEs of blocks of a multiblock because my multiblocks are pretty dynamic and some 3-dimensional array storing their structure wouldn't work. This blockstate will replace corresponding block of the multiblock with itself when the multiblock is dissassembled(some of its blocks are destroyed). But I don't know if each block in the world is unique blockstate or just reference to certain blockstate.

Doing some researches I came across StateContainer that is filled with blockstates in constructor of Block and stored there. This is a proof of blockstates being created only once for each combination of properties.

Do blockstates have fixed indexes? Because I want to store the indexes in unloaded chunks instead of map of properties and values(since O(1) is better than O(n)). "Fixed indexes" means that the same blockstate will have the same index each time game loads.

Edited May 13, 2020 by AntonBespoiasov

[Draco18s 2425]

2 hours ago, AntonBespoiasov said:

But I don't know if each block in the world is unique blockstate or just reference to certain blockstate.

Why not dig into the World and Chunk classes to find out what happens when you call setBlockState().

2 hours ago, AntonBespoiasov said:

Do blockstates have fixed indexes?

They don't have indexes at all.

[diesieben07 7786]

The only way to reliably store block states is NBTUtil.writeBlockState, which will serialize a map of properties and their values.

Chunks use IDs to store the states, but these IDs are only valid within that chunk and might change.