개념
환경설정
All blocks are of a base type. Examples of base types include redstone dust, brick stairs, and chest. However, to further differentiate these base types, each block has set of different properties, of which each can take a limited set of values (i.e. activated redstone, corner brick stairs, double chest). A block can have multiple properties (such as corner,*upsidedown* stairs).
Examples of block properties
minecraft:dirt[snowy=false,variant=default] minecraft:dirt[snowy=true,variant=default] minecraft:dirt[snowy=false,variant=grassless] minecraft:dirt[snowy=true,variant=grassless] minecraft:redstone_wire[east=up,north=up,power=0,south=up,west=up] minecraft:redstone_wire[east=side,north=up,power=0,south=up,west=up] minecraft:redstone_wire[east=none,north=up,power=0,south=up,west=up] minecraft:redstone_wire[east=up,north=side,power=0,south=up,west=up]
Some properties, however, are ephemeral – they exist only when the game is running. Their values are not written to
the save file because their values can be detected automatically. For example, with Redstone wire, whether they are
powered or not can be detected based on the environment (is there a lever that is on?). In this case, the power
property of minecraft:redstone_wire as illustrated above is an ephemeral property.
Each property will have a finite number of valid values that can be assigned to the property. Exampeles would be that redstone power can only be a value between 0 and 15. This means that Minecraft knows each possible state of a block prior to fully booting the server. This is required knowledge as sending blocks over the network are compressed to a number.
Block Entity Data
With block properties having a known preset of possible values, these cannot be used when attempting to store data whereby there is a infinite amount of possibilities. Examples include sign text and block inventories.
Minecraft’s solution to this is block entities, which are Java objects that store additional data on a Location the block is at in NBT format. Examples of block entities are Chest
Example use would be to receive the inventory of a chest. This can be done as follows
import org.spongepowered.api.world.server.ServerLocation;
import org.spongepowered.api.block.entity.BlockEntity;
import org.spongepowered.api.block.entity.carrier.chest.Chest;
import org.spongepowered.api.item.inventory.type.BlockEntityInventory;
public Optional<BlockEntityInventory<Chest>> getChestInventory(ServerLocation location){
Optional<BlockEntity> optionalBlockEntity = location.blockEntity();
if(optionalBlockEntity.isPresent()){
BlockEntity blockEntity = optionalBlockEntity.get();
if(blockEntity instanceof Chest){
Chest chest = (Chest) blockEntity;
return Optional.of(chest.inventory());
}
}
return Optional.empty();
}
팁
Some things, like paintings, are actually entities.
However, tile entities can also override rendering so they don’t look like a regular block, although this is generally inefficient and causes a client framerate drop.
