minecraft-src/net/minecraft/core/component/DataComponentPredicate.java

package net.minecraft.core.component;

import com.google.common.collect.ImmutableList;
import com.mojang.serialization.Codec;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import net.minecraft.network.RegistryFriendlyByteBuf;
import net.minecraft.network.codec.ByteBufCodecs;
import net.minecraft.network.codec.StreamCodec;

public final class DataComponentPredicate implements Predicate<DataComponentMap> {
	public static final Codec<DataComponentPredicate> CODEC = DataComponentType.VALUE_MAP_CODEC
		.xmap(
			map -> new DataComponentPredicate(
				(List<TypedDataComponent<?>>)map.entrySet().stream().map(TypedDataComponent::fromEntryUnchecked).collect(Collectors.toList())
			),
			dataComponentPredicate -> (Map)dataComponentPredicate.expectedComponents
				.stream()
				.filter(typedDataComponent -> !typedDataComponent.type().isTransient())
				.collect(Collectors.toMap(TypedDataComponent::type, TypedDataComponent::value))
		);
	public static final StreamCodec<RegistryFriendlyByteBuf, DataComponentPredicate> STREAM_CODEC = TypedDataComponent.STREAM_CODEC
		.apply(ByteBufCodecs.list())
		.map(DataComponentPredicate::new, dataComponentPredicate -> dataComponentPredicate.expectedComponents);
	public static final DataComponentPredicate EMPTY = new DataComponentPredicate(List.of());
	private final List<TypedDataComponent<?>> expectedComponents;

	DataComponentPredicate(List<TypedDataComponent<?>> expectedComponents) {
		this.expectedComponents = expectedComponents;
	}

	public static DataComponentPredicate.Builder builder() {
		return new DataComponentPredicate.Builder();
	}

	public static DataComponentPredicate allOf(DataComponentMap expectedComponents) {
		return new DataComponentPredicate(ImmutableList.copyOf(expectedComponents));
	}

	public static DataComponentPredicate someOf(DataComponentMap dataComponentMap, DataComponentType<?>... dataComponentTypes) {
		DataComponentPredicate.Builder builder = new DataComponentPredicate.Builder();

		for (DataComponentType<?> dataComponentType : dataComponentTypes) {
			TypedDataComponent<?> typedDataComponent = dataComponentMap.getTyped(dataComponentType);
			if (typedDataComponent != null) {
				builder.expect(typedDataComponent);
			}
		}

		return builder.build();
	}

	public boolean equals(Object object) {
		return object instanceof DataComponentPredicate dataComponentPredicate && this.expectedComponents.equals(dataComponentPredicate.expectedComponents);
	}

	public int hashCode() {
		return this.expectedComponents.hashCode();
	}

	public String toString() {
		return this.expectedComponents.toString();
	}

	public boolean test(DataComponentMap components) {
		for (TypedDataComponent<?> typedDataComponent : this.expectedComponents) {
			Object object = components.get(typedDataComponent.type());
			if (!Objects.equals(typedDataComponent.value(), object)) {
				return false;
			}
		}

		return true;
	}

	public boolean test(DataComponentHolder components) {
		return this.test(components.getComponents());
	}

	public boolean alwaysMatches() {
		return this.expectedComponents.isEmpty();
	}

	public DataComponentPatch asPatch() {
		DataComponentPatch.Builder builder = DataComponentPatch.builder();

		for (TypedDataComponent<?> typedDataComponent : this.expectedComponents) {
			builder.set(typedDataComponent);
		}

		return builder.build();
	}

	public static class Builder {
		private final List<TypedDataComponent<?>> expectedComponents = new ArrayList();

		Builder() {
		}

		public <T> DataComponentPredicate.Builder expect(TypedDataComponent<T> typedDataComponent) {
			return this.expect(typedDataComponent.type(), typedDataComponent.value());
		}

		public <T> DataComponentPredicate.Builder expect(DataComponentType<? super T> component, T value) {
			for (TypedDataComponent<?> typedDataComponent : this.expectedComponents) {
				if (typedDataComponent.type() == component) {
					throw new IllegalArgumentException("Predicate already has component of type: '" + component + "'");
				}
			}

			this.expectedComponents.add(new TypedDataComponent<>(component, value));
			return this;
		}

		public DataComponentPredicate build() {
			return new DataComponentPredicate(List.copyOf(this.expectedComponents));
		}
	}
}