Please note this is exactly the same as doing:
filterFactory.literal( JTS.toGeometry( bounds ) );
author: Ian Turton, CCG version: $Id: BBoxExpressionImpl.java 25630 2007-05-24 20:15:52Z jgarnett $
Creates a new instance of BBoxExpression, with an initial box.
Parameters: env - the envelope to set as the box. throws: IllegalFilterException - if there are problems.