We want to implement virtuals for Java at some point and for that we
need to know the package that provides the virtual because some virtuals
can be provided by the JDK or normal packages and this affects the JDK
selection at build time. One option is to call into Portage to find this
out, but of course Paludis and Pkgcore people most likely don't like
this approach. One thing that comes to mind is to allow for virtuals to
install files so we can install the provider information in a format
easy for us. We need the information in format ${PN}-${SLOT} because
that's the way we install in /usr/share. So do you think it's ok for
virtuals to install files (we can of course call the category
java-virtual/ too), should we call Portage code, or do you have an
another idea?

Regards,
Petteri
--
Gentoo/Java project lead