: I am using a servlet filter to alter the query parms sent to the solr ,
: now I have a problem where I want to take some extra action (like drop some
: query terms or filters ) if the current query returns no reults.

FWIW: you're probably better off implementing this as a plugin -- either 
as a SearchComponent or a whole RequestHandler

: How can i efficiently get the count of the results for a specified query ,
: so that i can take an informed decision in the servlet filter.

SolrIndexSearcher.getDocSet(yourQuery).size();


-Hoss

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