def __init__(self, wfid, sub_wfid, expid, engine_id = None):
"""
@type wfid: C{string}
@param wfid: workflow instance id,
the identifier for the process instance
@type sub_wfid: C{string}
@param sub_wfid: the identifier for the
sub process within the main instance
@type expid: C{string} of form '^\d{0,2}%s\d{0,2}%s\d{0,2}$'
@param expid: the expression id, where in the process tree
@type engine_id: string
@param engine_id: only relevant in multi engine scenarii
"""
self._wfid = wfid
self._sub_wfid = sub_wfid
self._expid = expression_id_factory(expid)
self._engine_id = engine_id
def test_expression_id_factory(self):
expid = expression_id_factory("1_2_3_4")
self.assertEquals([1,2,3,4], list(expid))