src/game/java/net/minecraft/client/resources/model/ModelResourceLocation.java

package net.minecraft.client.resources.model;

import java.util.Locale;
import net.minecraft.resources.ResourceLocation;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public record ModelResourceLocation(ResourceLocation id, String variant) {
    public ModelResourceLocation(ResourceLocation id, String variant) {
        variant = lowercaseVariant(variant);
        this.id = id;
        this.variant = variant;
    }

    private static String lowercaseVariant(String p_248567_) {
        return p_248567_.toLowerCase(Locale.ROOT);
    }

    public String getVariant() {
        return this.variant;
    }

    @Override
    public String toString() {
        return this.id + "#" + this.variant;
    }
}