example.java

import net.minecraft.core.component.DataComponentType;
import net.minecraft.core.component.DataComponents;
import net.minecraft.core.registries.BuiltInRegistries;
import net.minecraft.network.codec.ByteBufCodecs;
import net.minecraft.util.ExtraCodecs;
import net.minecraft.world.item.DyeItem;
import net.minecraft.world.item.Items;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.event.GatherItemComponentsEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
import net.minecraftforge.registries.DeferredRegister;
import net.minecraftforge.registries.RegistryObject;

// The value here should match an entry in the META-INF/mods.toml file
@Mod(ExampleMod.MODID)
public class ExampleMod
{
    public static final String MODID = "examplemod";
    public static final DeferredRegister<DataComponentType<?>> COMPONENT_TYPES = DeferredRegister.create(BuiltInRegistries.DATA_COMPONENT_TYPE.key(), MODID);
    public static final RegistryObject<DataComponentType<Integer>> EXAMPLE_COMPONENT = COMPONENT_TYPES.register("test", () -> {
        return DataComponentType.<Integer>builder()
                .persistent(ExtraCodecs.intRange(0, Integer.MAX_VALUE))
                .networkSynchronized(ByteBufCodecs.VAR_INT)
                .build();
    });


    public ExampleMod()
    {
        var modBus = FMLJavaModLoadingContext.get().getModEventBus();
        COMPONENT_TYPES.register(modBus);
        MinecraftForge.EVENT_BUS.addListener(this::onItem);
    }


    public void onItem(GatherItemComponentsEvent event) {
        switch (event.getItem()) {
            case DyeItem a -> {
                event.register(DataComponents.MAX_STACK_SIZE, 16);
                event.register(DataComponents.DAMAGE, 10);
                event.register(DataComponents.MAX_DAMAGE, 100);
            }
            default -> {}
        }



        if (event.getItem() == Items.BEACON) {
            event.register(DataComponents.MAX_STACK_SIZE, 16);
            event.register(DataComponents.DAMAGE, 10);
            event.register(DataComponents.MAX_DAMAGE, 100);
            event.register(EXAMPLE_COMPONENT.get(), 10);
        }
    }
}