Coverage for python/lsst/daf/butler/core/_butlerUri/mem.py : 75%

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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/>.
22from typing import Tuple
24__all__ = ('ButlerInMemoryURI',)
26from ._butlerUri import ButlerURI
29class ButlerInMemoryURI(ButlerURI):
30 """Internal in-memory datastore URI (`mem://`).
32 Not used for any real purpose other than indicating that the dataset
33 is in memory.
34 """
36 def exists(self) -> bool:
37 """Test for existence and always return False."""
38 return True
40 def _as_local(self) -> Tuple[str, bool]:
41 raise RuntimeError(f"Do not know how to retrieve data for URI '{self}'")