[Rpm-maint] read rpm database with Java

Panu Matilainen pmatilai at redhat.com
Wed Jun 4 14:20:38 UTC 2014

On 06/04/2014 03:34 PM, Peter Penzov wrote:
> Hi, thank you for the answer but I didn't understand much of your comment.
> In general what are the ways to read rpm database with Java?

In general to perform tasks / access services of a program written in 
another language there are roughly three options which are in no way 
specific to rpm or Java, each with their pros and cons:

1) Shell out to call command line utilities, parse output
2) Use language bindings to access the other programs library
3) (Try to) reimplement the whole thing in in the language

1) is typically by far the least amount of work, but also the most 
limited in what can be achieved. Since 2) doesn't exist for Java AFAIK, 
you'd need to implement the bindings on your own, and is going to be 
non-trivial amount of work. 3) is the route taken by jrpm (AFAIK) and is 
obviously by far the biggest amount of work and guaranteed to be more or 
less incompatible forevermore for anything non-trivial such as rpm

Whatever works best depends on the situation. I wont be able to tell you 
how to do any of that in Java though.

	- Panu -

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