nl: factory to create the transformer . if the map is null , a transformer that always returns null is returned . concode_field_sep Map iMap concode_elem_sep long serialVersionUID concode_field_sep Object transform concode_elem_sep Map getMap
code: Transformer function ( Map arg0 ) { if ( arg0 == null ) { return ConstantTransformer . NULL_INSTANCE ; } return new MapTransformer ( arg0 ) ; }