Konzept
Eigenschaften
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).
Beispiele für Blockeigenschaften
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]
Einige Eigenschaften sind flüchtig – sie existieren nur, wenn das Spiel läuft. Ihre Werte werden nicht auf der Festplatte gespeichert, da sie automatisch erkannt werden können. Beispielsweise kann die Signalstärke eines Redstone-Kabels durch die Umgebung bestimmt werden (ist ein aktivierter Hebel verbunden?). In diesem Fall ist die oben genannte power-Eigenschaft von minecraft:redstone_wire eine flüchtige Eigenschaft.
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();
}
Tipp
Manche Dinge, wie Bilder, sind in Wirklichkeit Entities.
Jedoch können Tile Entities ihre Darstellung (engl. rendering) überschreiben, sodass sie nicht wie ein normaler Block aussehen, obwohl dies generell ineffizient ist und bewirken kann, dass die Client-Bildrate einbricht.
