Implementation of the Evaluator Factory interface that creates evaluators
of string attributes in implementations of IPerson to determine if a user
gets a layout fragment.
author: mboyd@sungardsct.com version: $Revision: 35711 $ $Date: 2005-05-02 22:55:35 -0700 (Mon, 02 May 2005) $ since: uPortal 2.5
returns an Evaluator unique to the type of attribute being
evaluated. subclasses can override this method to return the
Evaluator that's appropriate to their implementation.
Parameters: name - the attribute's name. Parameters: mode - the attribute's mode. (i.e. 'equals') Parameters: value - the attribute's value. an Evaluator for evaluating attributes