@EventHandler(ignoreCancelled = true)
public void on(InventoryDragEvent event) {
    if (isEnabled()) return;

    if (!(event.getView().getTopInventory() instanceof HorseInventory)) return;

    // if it's not a disabled type do nothing
    if (!DISABLED.contains(event.getOldCursor().getType())) return;

    event.getWhoClicked().sendMessage(messages.getRaw("disabled message"));
    event.setCancelled(true);
}
 

@Override
public HorseInventory getInventory();
 

@Override
public HorseInventory getInventory() {
    return new CraftInventoryHorse(getHandle().horseChest);
}
 

@Override
public void setArmour(HorseArmour a) {
    ((HorseInventory) ((InventoryHolder) getBukkitEntity()).getInventory())
            .setArmor(a.getMaterial() == null ? null : new ItemStack(a.getMaterial(), 1));
}
 

public HorseInventory getInventory() {
    return new CraftInventoryHorse(getHandle().horseChest);
}
 

@EventHandler(ignoreCancelled = true)
public void on(InventoryClickEvent event) {
    if (isEnabled()) return;

    if (!(event.getView().getTopInventory() instanceof HorseInventory)) return;

    // clicked outside of the window
    if (event.getClickedInventory() == null) return;

    final InventoryType clicked = event.getClickedInventory().getType();

    // get any relevant stack to check the type of based on the action took
    Optional<ItemStack> relevant = Optional.absent();
    switch (event.getAction()) {
        case MOVE_TO_OTHER_INVENTORY:
            // only worry about player -> horse
            if (clicked == InventoryType.PLAYER) {
                relevant = Optional.fromNullable(event.getCurrentItem());
            }
            break;
        case PLACE_ALL:
        case PLACE_SOME:
        case PLACE_ONE:
        case SWAP_WITH_CURSOR:
            // only worry about within the horse
            if (clicked != InventoryType.PLAYER) {
                relevant = Optional.fromNullable(event.getCursor());
            }
            break;
        case HOTBAR_SWAP:
            // only worry about within a horse
            if (clicked != InventoryType.PLAYER) {
                relevant = Optional.fromNullable(
                        event.getWhoClicked().getInventory().getItem(event.getHotbarButton())
                );
            }
            break;
        default:
    }

    if (relevant.isPresent() && DISABLED.contains(relevant.get().getType())) {
        event.getWhoClicked().sendMessage(messages.getRaw("disabled message"));
        event.setCancelled(true);
    }
}