A rule that can be configured to take alternate implementations
of the ExternalImplInterface.
If no implementation specified, or none found, returns
configured decision.
author: stack version: $Date: 2007-02-18 21:53:01 +0000 (Sun, 18 Feb 2007) $, $Revision: 4914 $
Get implementation, if one specified.
If none specified, will keep trying to find one. Will be messy
if the provided class is not-instantiable or not implementation
of ExternalImplInterface.
Parameters: o - A context object. Instance of ExternalImplInterface or null.
Methods inherited from org.archive.crawler.deciderules.PredicatedDecideRule