logDetail( "Not adding existing "
if ( _logger.isDetailEnabled() ) _logger.detail( "Not adding existing "
    StressInstance add( Object stress_obj, Vector new_stress_set )    {        // We need to walk the entire causation path and add every        // stress we find along the way.        StressInstance stress                 = (StressInstance) _nodes_by_object.get( stress_obj );        // First see whether or not we have already added this. We do        // not need to add anything twice.        //        if ( stress != null )        {            logDetail( "Not adding existing "                      + stress.getTypeStr()                       + " stress " + stress.getName() );            return stress;        }                stress = StressInstanceFactory.create( stress_obj );        logDetail( "Adding new "                  + stress.getTypeStr()                   + " stress " + stress.getName() );                _nodes_by_object.put( stress_obj, stress );        new_stress_set.addElement( stress );        // This will do two things: link a transitive event up to this        // stress, and rcurse down the transitive relationship.         //        connectAndRecurse( stress, new_stress_set );        return stress;    } // method add