MarketManager.java 文件源码

public static boolean containsBook(ItemStack item) {
    if (item.hasItemMeta() && item.getItemMeta() instanceof BlockStateMeta) {
        BlockStateMeta blockStateMeta = (BlockStateMeta) item.getItemMeta();
        if (blockStateMeta.hasBlockState() && blockStateMeta.getBlockState() instanceof InventoryHolder) {
            InventoryHolder inventoryHolder = (InventoryHolder) blockStateMeta.getBlockState();
            for (ItemStack itemStack : inventoryHolder.getInventory().getContents()) {
                if (itemStack != null && itemStack.getType() != Material.AIR &&
                        itemStack.hasItemMeta() && itemStack.getItemMeta() instanceof BookMeta) {
                    return true;
                }
            }
        }
    }
    return false;
}