Method canConnectTo

src/main/java/net/minecraft/block/BlockWall.java:122–126

(IBlockAccess worldIn, BlockPos pos)

    }

    public boolean canConnectTo(IBlockAccess worldIn, BlockPos pos)
    {
        Block block = worldIn.getBlockState(pos).getBlock();
        return block == Blocks.barrier ? false : (block != this && !(block instanceof BlockFenceGate) ? (block.blockMaterial.isOpaque() && block.isFullCube() ? block.blockMaterial != Material.gourd : false) : true);
    }

    /**
     * returns a list of blocks with the same ID, but different meta (eg: wood returns 4 blocks)