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1# This file is part of pipe_base. 

2# 

3# Developed for the LSST Data Management System. 

4# This product includes software developed by the LSST Project 

5# (http://www.lsst.org). 

6# See the COPYRIGHT file at the top-level directory of this distribution 

7# for details of code ownership. 

8# 

9# This program is free software: you can redistribute it and/or modify 

10# it under the terms of the GNU General Public License as published by 

11# the Free Software Foundation, either version 3 of the License, or 

12# (at your option) any later version. 

13# 

14# This program is distributed in the hope that it will be useful, 

15# but WITHOUT ANY WARRANTY; without even the implied warranty of 

16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

17# GNU General Public License for more details. 

18# 

19# You should have received a copy of the GNU General Public License 

20# along with this program. If not, see <http://www.gnu.org/licenses/>. 

21 

22"""Module defining TaskFactory interface. 

23""" 

24 

25__all__ = ["TaskFactory"] 

26 

27from abc import ABCMeta, abstractmethod 

28 

29 

30class TaskFactory(metaclass=ABCMeta): 

31 """Abstract base class for task factory. 

32 

33 Task factory is responsible for creating instances of PipelineTask 

34 subclasses. 

35 """ 

36 

37 @abstractmethod 

38 def makeTask(self, taskClass, config, overrides, butler): 

39 """Create new PipelineTask instance from its class. 

40 

41 Parameters 

42 ---------- 

43 taskClass : `type` 

44 `PipelineTask` sub-class. 

45 config : `pex.Config` or `None` 

46 Configuration object, if `None` then use task-defined 

47 configuration class (``taskClass.ConfigClass``) to create new 

48 instance. 

49 overrides : `ConfigOverrides` or `None` 

50 Configuration overrides, this should contain all overrides to be 

51 applied to a default task config, including instrument-specific, 

52 obs-package specific, and possibly command-line overrides. This 

53 parameter is exclusive with ``config``, only one of the two can be 

54 specified as not-`None`. 

55 butler : `~lsst.daf.butler.Butler` or None 

56 Butler instance used to obtain initialization inputs for 

57 PipelineTasks. If `None`, some PipelineTasks will not be usable 

58 

59 Returns 

60 ------- 

61 task : `PipelineTask` 

62 Instance of a `PipelineTask` class or `None` on errors. 

63 

64 Raises 

65 ------ 

66 Any exceptions that are raised by PipelineTask constructor or its 

67 configuration class are propagated back to caller. 

68 """