How to get data from a database by user's role?

I'm using Hibernate ORM (with MySQL) and JavaServer Faces (PrimeFaces). Here is project structure:

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(I'm a novice here and haven't enought rights to post imeges :D)
I have a method "getAllDevices()" that returns all devices from DB. Users-Devices relations are many-to-many. An User has an role either "ADMIN" or "USER". I want to get devices relatively user's role: if "ADMIN" - all devices in the DB, else only user's devices. How do I make it clear and avoid swelling code in beans or services? May be I should use some pattern here?