Class TimelessAPI

src/main/java/com/tacz/guns/api/TimelessAPI.java:28–149

import java.util.Set;

public final class TimelessAPI {
    @OnlyIn(Dist.CLIENT)
    public static Optional<GunDisplayInstance> getGunDisplay(ItemStack stack) {
        if (stack.getItem() instanceof IGun iGun) {
            ResourceLocation gunId = iGun.getGunId(stack);
            if (getCommonGunIndex(gunId).isEmpty()) {
                return Optional.empty();
            }
            ResourceLocation displayId = iGun.getGunDisplayId(stack);
            if (displayId.equals(DefaultAssets.DEFAULT_GUN_DISPLAY_ID)) {
                return getClientGunIndex(gunId).map(ClientGunIndex::getDefaultDisplay);
            } else {
                return getGunDisplay(displayId, gunId);
            }
        }
        return Optional.empty();
    }

    @OnlyIn(Dist.CLIENT)
    public static Optional<ClientGunIndex> getClientGunIndex(ResourceLocation gunId) {
        return Optional.ofNullable(ClientIndexManager.GUN_INDEX.get(gunId));
    }

    @OnlyIn(Dist.CLIENT)
    public static Optional<GunDisplayInstance> getGunDisplay(ResourceLocation displayId, ResourceLocation fallbackGunId) {
        if (displayId == null || displayId.equals(DefaultAssets.DEFAULT_GUN_DISPLAY_ID)) {
            return getClientGunIndex(fallbackGunId).map(ClientGunIndex::getDefaultDisplay);
        }

        GunDisplayInstance instance = ClientIndexManager.getOrCreateGunDisplay(displayId);
        if (instance == null) {
            return getClientGunIndex(fallbackGunId).map(ClientGunIndex::getDefaultDisplay);
        }
        return Optional.of(instance);
    }

    @OnlyIn(Dist.CLIENT)
    public static Optional<ClientAttachmentIndex> getClientAttachmentIndex(ResourceLocation attachmentId) {
        return Optional.ofNullable(ClientIndexManager.ATTACHMENT_INDEX.get(attachmentId));
    }

    @OnlyIn(Dist.CLIENT)
    public static Optional<ClientAmmoIndex> getClientAmmoIndex(ResourceLocation ammoId) {
        return Optional.ofNullable(ClientIndexManager.AMMO_INDEX.get(ammoId));
    }

    @OnlyIn(Dist.CLIENT)
    public static Optional<ClientBlockIndex> getClientBlockIndex(ResourceLocation blockId) {
        return Optional.ofNullable(ClientIndexManager.BLOCK_INDEX.get(blockId));
    }

    @OnlyIn(Dist.CLIENT)
    public static Set<Map.Entry<ResourceLocation, ClientGunIndex>> getAllClientGunIndex() {
        return ClientIndexManager.getAllGuns();
    }

    @OnlyIn(Dist.CLIENT)
    public static Set<Map.Entry<ResourceLocation, ClientAmmoIndex>> getAllClientAmmoIndex() {