How to create a Java FontDescriptor from font file?

Hi,

I'm trying to use the FOP font subsetting tools for TTF and OTF fonts 
outside of the FOP processor in a side project.
I know this is probably out of scope of this mailing list, but probably 
someone can help me anyways...

My problem at the moment is, that I just don't see how to construct a 
FontDesriptor from a system font file.

I mean, I found out how to read the font with a FontFileReader and also 
found out about the OTFSubSetFile and the TTFSubSetFile classes, but if 
I want to determine automagically whether to use the OTF or TTF class 
(as in [1]) I always get to the point where I need a FontDescriptor object.

And after some wasted hours of time digging through the FOP sources, I 
still haven't found a way to create this object directly from a source 
File/URI.

Any idea is appreciated!
Thank you very much!

Kind regards,
Tobias


[1] 
https://github.com/apache/fop/blob/trunk/fop-core/src/main/java/org/apache/fop/pdf/PDFFactory.java#L1360

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