minecraft-src/net/minecraft/advancements/critereon/BlockPredicate.java

package net.minecraft.advancements.critereon;

import com.mojang.serialization.Codec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.Arrays;
import java.util.Collection;
import java.util.Optional;
import net.minecraft.core.BlockPos;
import net.minecraft.core.HolderGetter;
import net.minecraft.core.HolderSet;
import net.minecraft.core.RegistryCodecs;
import net.minecraft.core.component.DataComponentGetter;
import net.minecraft.core.registries.Registries;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.network.RegistryFriendlyByteBuf;
import net.minecraft.network.codec.ByteBufCodecs;
import net.minecraft.network.codec.StreamCodec;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.tags.TagKey;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.entity.BlockEntity;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.pattern.BlockInWorld;
import org.jetbrains.annotations.Nullable;

public record BlockPredicate(
	Optional<HolderSet<Block>> blocks, Optional<StatePropertiesPredicate> properties, Optional<NbtPredicate> nbt, DataComponentMatchers components
) {
	public static final Codec<BlockPredicate> CODEC = RecordCodecBuilder.create(
		instance -> instance.group(
				RegistryCodecs.homogeneousList(Registries.BLOCK).optionalFieldOf("blocks").forGetter(BlockPredicate::blocks),
				StatePropertiesPredicate.CODEC.optionalFieldOf("state").forGetter(BlockPredicate::properties),
				NbtPredicate.CODEC.optionalFieldOf("nbt").forGetter(BlockPredicate::nbt),
				DataComponentMatchers.CODEC.forGetter(BlockPredicate::components)
			)
			.apply(instance, BlockPredicate::new)
	);
	public static final StreamCodec<RegistryFriendlyByteBuf, BlockPredicate> STREAM_CODEC = StreamCodec.composite(
		ByteBufCodecs.optional(ByteBufCodecs.holderSet(Registries.BLOCK)),
		BlockPredicate::blocks,
		ByteBufCodecs.optional(StatePropertiesPredicate.STREAM_CODEC),
		BlockPredicate::properties,
		ByteBufCodecs.optional(NbtPredicate.STREAM_CODEC),
		BlockPredicate::nbt,
		DataComponentMatchers.STREAM_CODEC,
		BlockPredicate::components,
		BlockPredicate::new
	);

	public boolean matches(ServerLevel level, BlockPos pos) {
		if (!level.isLoaded(pos)) {
			return false;
		} else if (!this.matchesState(level.getBlockState(pos))) {
			return false;
		} else {
			if (this.nbt.isPresent() || !this.components.isEmpty()) {
				BlockEntity blockEntity = level.getBlockEntity(pos);
				if (this.nbt.isPresent() && !matchesBlockEntity(level, blockEntity, (NbtPredicate)this.nbt.get())) {
					return false;
				}

				if (!this.components.isEmpty() && !matchesComponents(blockEntity, this.components)) {
					return false;
				}
			}

			return true;
		}
	}

	public boolean matches(BlockInWorld block) {
		return !this.matchesState(block.getState())
			? false
			: !this.nbt.isPresent() || matchesBlockEntity(block.getLevel(), block.getEntity(), (NbtPredicate)this.nbt.get());
	}

	private boolean matchesState(BlockState state) {
		return this.blocks.isPresent() && !state.is((HolderSet<Block>)this.blocks.get())
			? false
			: !this.properties.isPresent() || ((StatePropertiesPredicate)this.properties.get()).matches(state);
	}

	private static boolean matchesBlockEntity(LevelReader level, @Nullable BlockEntity blockEntity, NbtPredicate nbtPredicate) {
		return blockEntity != null && nbtPredicate.matches(blockEntity.saveWithFullMetadata(level.registryAccess()));
	}

	private static boolean matchesComponents(@Nullable BlockEntity entity, DataComponentMatchers components) {
		return entity != null && components.test((DataComponentGetter)entity.collectComponents());
	}

	public boolean requiresNbt() {
		return this.nbt.isPresent();
	}

	public static class Builder {
		private Optional<HolderSet<Block>> blocks = Optional.empty();
		private Optional<StatePropertiesPredicate> properties = Optional.empty();
		private Optional<NbtPredicate> nbt = Optional.empty();
		private DataComponentMatchers components = DataComponentMatchers.ANY;

		private Builder() {
		}

		public static BlockPredicate.Builder block() {
			return new BlockPredicate.Builder();
		}

		public BlockPredicate.Builder of(HolderGetter<Block> blockRegistry, Block... blocks) {
			return this.of(blockRegistry, Arrays.asList(blocks));
		}

		public BlockPredicate.Builder of(HolderGetter<Block> blockRegistry, Collection<Block> blocks) {
			this.blocks = Optional.of(HolderSet.direct(Block::builtInRegistryHolder, blocks));
			return this;
		}

		public BlockPredicate.Builder of(HolderGetter<Block> blockRegistry, TagKey<Block> blockTag) {
			this.blocks = Optional.of(blockRegistry.getOrThrow(blockTag));
			return this;
		}

		public BlockPredicate.Builder hasNbt(CompoundTag nbt) {
			this.nbt = Optional.of(new NbtPredicate(nbt));
			return this;
		}

		public BlockPredicate.Builder setProperties(StatePropertiesPredicate.Builder properties) {
			this.properties = properties.build();
			return this;
		}

		public BlockPredicate.Builder components(DataComponentMatchers components) {
			this.components = components;
			return this;
		}

		public BlockPredicate build() {
			return new BlockPredicate(this.blocks, this.properties, this.nbt, this.components);
		}
	}
}