question: public static List < String > makeFeatureIdListFromPrefixed ( Map < String , Object > parameters ) { List < String > featureIdList = FastList . newInstance ( ) ; if ( parameters == null ) return featureIdList ; for ( Map . Entry < String , Object > entry : parameters . entrySet ( ) ) { String parameterName = entry . getKey ( ) ; if ( parameterName . startsWith ( "SEARCH_FEAT" ) ) { String productFeatureId = ( String ) entry . getValue ( ) ; if ( UtilValidate . isNotEmpty ( productFeatureId ) ) { featureIdList . add ( productFeatureId ) ; } } } return featureIdList ; }
target:  Handles parameters coming in prefixed with "SEARCH_FEAT" where the parameter value is a productFeatureId; meant to be used with text entry boxes or check-boxes and such 