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1# This file is part of daf_butler. 

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 

22from typing import Tuple 

23 

24__all__ = ('ButlerInMemoryURI',) 

25 

26from ._butlerUri import ButlerURI 

27 

28 

29class ButlerInMemoryURI(ButlerURI): 

30 """Internal in-memory datastore URI (`mem://`). 

31 

32 Not used for any real purpose other than indicating that the dataset 

33 is in memory. 

34 """ 

35 

36 def exists(self) -> bool: 

37 """Test for existence and always return False.""" 

38 return True 

39 

40 def _as_local(self) -> Tuple[str, bool]: 

41 raise RuntimeError(f"Do not know how to retrieve data for URI '{self}'")