NaturesAura/src/main/java/de/ellpeck/naturesaura/compat/BaublesCompat.java

package de.ellpeck.naturesaura.compat;

import baubles.api.BaubleType;
import baubles.api.IBauble;
import baubles.api.cap.BaublesCapabilities;
import de.ellpeck.naturesaura.NaturesAura;
import de.ellpeck.naturesaura.items.ModItems;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.ICapabilityProvider;
import net.minecraftforge.event.AttachCapabilitiesEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class BaublesCompat {

    private final IBauble eye = stack -> BaubleType.CHARM;

    @SubscribeEvent
    public void onCapabilitiesAttach(AttachCapabilitiesEvent<ItemStack> event) {
        Item item = event.getObject().getItem();
        if (item == ModItems.EYE) {
            event.addCapability(new ResourceLocation(NaturesAura.MOD_ID, "bauble"), new ICapabilityProvider() {
                @Override
                public boolean hasCapability(@Nonnull Capability<?> capability, @Nullable EnumFacing facing) {
                    return capability == BaublesCapabilities.CAPABILITY_ITEM_BAUBLE;
                }

                @Nullable
                @Override
                public <T> T getCapability(@Nonnull Capability<T> capability, @Nullable EnumFacing facing) {
                    return capability == BaublesCapabilities.CAPABILITY_ITEM_BAUBLE ? (T) BaublesCompat.this.eye : null;
                }
            });
        }
    }
}