How to feed LP files to the GLOP solver of or-tools?

I would like to use or-tools and the GLOP solver to solve linear programming problems.

I already have another program that creates LP files which are, as far as I know, fairly standard for defining linear programs.

Has anyone managed to pass those files directly to GLOP? What file format das GLOP understand and how do I pass them to GLOP?

Example lp file:

maximize 2x1 + 3x2 - x3
subject to
 x1 + x2 <= 1
 x1 + x2 + x3 <= 0
 x2 - 2x3 <= 2
bounds
 x1 free
 x2 free
 x3 free
end

Edit:

I am looking for a Java solution
LoadLinearProgramFromModelOrRequest seems to be the way. See here. I don't know how to use it though

Solution

There is not API to read LP files, we did not write a good enough LP reader. We do support reading MPS files.