src/game/java/net/minecraft/util/datafix/fixes/AbstractUUIDFix.java

package net.minecraft.util.datafix.fixes;

import com.mojang.datafixers.DSL;
import com.mojang.datafixers.DataFix;
import com.mojang.datafixers.Typed;
import com.mojang.datafixers.DSL.TypeReference;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.serialization.Dynamic;
import java.util.Arrays;
import java.util.Optional;
import java.util.UUID;
import java.util.function.Function;

public abstract class AbstractUUIDFix extends DataFix {
    protected TypeReference typeReference;

    public AbstractUUIDFix(Schema p_14572_, TypeReference p_14573_) {
        super(p_14572_, false);
        this.typeReference = p_14573_;
    }

    protected Typed<?> updateNamedChoice(Typed<?> p_14575_, String p_14576_, Function<Dynamic<?>, Dynamic<?>> p_14577_) {
        Type<?> type = this.getInputSchema().getChoiceType(this.typeReference, p_14576_);
        Type<?> type1 = this.getOutputSchema().getChoiceType(this.typeReference, p_14576_);
        return p_14575_.updateTyped(DSL.namedChoice(p_14576_, type), type1, p_14607_ -> p_14607_.update(DSL.remainderFinder(), p_14577_));
    }

    protected static Optional<Dynamic<?>> replaceUUIDString(Dynamic<?> p_14591_, String p_14592_, String p_14593_) {
        return createUUIDFromString(p_14591_, p_14592_).map(p_14616_ -> p_14591_.remove(p_14592_).set(p_14593_, (Dynamic<?>)p_14616_));
    }

    protected static Optional<Dynamic<?>> replaceUUIDMLTag(Dynamic<?> p_14609_, String p_14610_, String p_14611_) {
        return p_14609_.get(p_14610_)
            .result()
            .flatMap(AbstractUUIDFix::createUUIDFromML)
            .map(p_14598_ -> p_14609_.remove(p_14610_).set(p_14611_, (Dynamic<?>)p_14598_));
    }

    protected static Optional<Dynamic<?>> replaceUUIDLeastMost(Dynamic<?> p_14618_, String p_14619_, String p_14620_) {
        String s = p_14619_ + "Most";
        String s1 = p_14619_ + "Least";
        return createUUIDFromLongs(p_14618_, s, s1).map(p_14604_ -> p_14618_.remove(s).remove(s1).set(p_14620_, (Dynamic<?>)p_14604_));
    }

    protected static Optional<Dynamic<?>> createUUIDFromString(Dynamic<?> p_14588_, String p_14589_) {
        return p_14588_.get(p_14589_).result().flatMap(p_14586_ -> {
            String s = p_14586_.asString(null);
            if (s != null) {
                try {
                    UUID uuid = UUID.fromString(s);
                    return createUUIDTag(p_14588_, uuid.getMostSignificantBits(), uuid.getLeastSignificantBits());
                } catch (IllegalArgumentException illegalargumentexception) {
                }
            }

            return Optional.empty();
        });
    }

    protected static Optional<Dynamic<?>> createUUIDFromML(Dynamic<?> p_14579_) {
        return createUUIDFromLongs(p_14579_, "M", "L");
    }

    protected static Optional<Dynamic<?>> createUUIDFromLongs(Dynamic<?> p_14622_, String p_14623_, String p_14624_) {
        long i = p_14622_.get(p_14623_).asLong(0L);
        long j = p_14622_.get(p_14624_).asLong(0L);
        return i != 0L && j != 0L ? createUUIDTag(p_14622_, i, j) : Optional.empty();
    }

    protected static Optional<Dynamic<?>> createUUIDTag(Dynamic<?> p_14581_, long p_14582_, long p_14583_) {
        return Optional.of(p_14581_.createIntList(Arrays.stream(new int[]{(int)(p_14582_ >> 32), (int)p_14582_, (int)(p_14583_ >> 32), (int)p_14583_})));
    }
}