Query Parser Builders
org.apache.lucene.queryParser.builders contains the interface that
builders must implement, it also contain a utility
QueryTreeBuilder, which walks the tree and
call the Builder for each node in the tree. Builder normally convert QueryNode Object into a
Lucene Query Object, and normally it's a one-to-one mapping class.
But other builders implementations can by written to convert QueryNode objects to other non lucene objects.