Class name of parsing the fq clause

[YouPeng Yang]

Hi
   I search the solr with fq clause,which is like:
   fq=BEGINTIME:[2013-08-25T16:00:00Z TO *] AND BUSID:(M30000 OR M90000)


   I am curious about the parsing process . I want to study it.
   What is the Java file name describes  the parsing  process of the fq
clause.


  Thanks

Regards.