Method canPlaceOn

src/main/java/net/minecraft/item/ItemStack.java:1063–1092

(Block blockIn)

    }

    public boolean canPlaceOn(Block blockIn)
    {
        if (blockIn == this.canPlaceOnCacheBlock)
        {
            return this.canPlaceOnCacheResult;
        }
        else
        {
            this.canPlaceOnCacheBlock = blockIn;

            if (this.hasTagCompound() && this.stackTagCompound.hasKey("CanPlaceOn", 9))
            {
                NBTTagList nbttaglist = this.stackTagCompound.getTagList("CanPlaceOn", 8);

                for (int i = 0; i < nbttaglist.tagCount(); ++i)
                {
                    Block block = Block.getBlockFromName(nbttaglist.getStringTagAt(i));

                    if (block == blockIn)
                    {
                        this.canPlaceOnCacheResult = true;
                        return true;
                    }
                }
            }

            this.canPlaceOnCacheResult = false;
            return false;
        }
    }
}