Ancestor of data loaders that create the result based on a file.
The first argument of the data loader will be the path of the file.
If the path is a relative path, then it will be relative to the data root
directory (an engine level setting), or if data root is null, then relative
to the working directory (OS facility). The path can use slash (/) instead
of the OS specific separator char.
args - Arguments that the caller specifies for this directive call.
The implementation should check if it understands all arguments,
and it should throw java.lang.IllegalArgumentException
if it doesn't.
The object that will be accessed in FreeMarker templates.
The object can be of any type. FreeMarker will wrap the object so
that it is visible as an FTL variable. However, if the object
implements freemarker.template.TemplateModel, then it
will not be wrapped, as it is already an FTL variable.