Slightly OT: How to grep for two different things in a file

I have 2 patterns I need to find in a given set of files.  A file only
matches if it contains *BOTH* patterns but not in any given
relationship as to where they are in the file.   In the past I have
used piped greps when both patterns are on the same line but in my
current case they are almost certainly not on the same line.

For example my two patterns are "tid" (String variable name) and
"/tmp" [String literal] (i.e. the full string is the concatenation of
the two patterns I would do:

grep -Ri tid src/java|grep -i /tmp

But since /tmp is in a symbolic constant defined elsewhere (in a
different Java file) I need to find programmatically either the name
of the constant (has different names in different classes) and then do
the piped grep above with it or I need to look for the two patterns
separately and say a file is only accepted if it has both.

P.S. The reason for this is I am attempting to audit my code base to
see what classes leave behind orphaned temp files.

-- 
Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org