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LSST Data Management Base Package
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transformFromString.py
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1# This product includes software developed by the LSST Project
2# (https://www.lsst.org).
3# See the COPYRIGHT file at the top-level directory of this distribution
4# for details of code ownership.
5#
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10#
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14# GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License
17# along with this program. If not, see <https://www.gnu.org/licenses/>.
18
19from ._python import transformRegistry
20
21__all__ = ["transformFromString"]
22
23
24def transformFromString(data):
25 """Read a Transform from a string that was saved using
26 ``Transform.writeString``
27
28 Unlike ``Transform.readString``, you need not know the ``Transform`` class in
29 advance
30
31 Parameters
32 ----------
33 data : `str`
34 A string in the format produced by ``Transform.writeString``.
35
36 Returns
37 -------
38 transform : a ``Transform`` class
39 An object of the same type used to create ``data``.
40 """
41 version, transformClassName, remainder = data.split(" ", 2)
42 try:
43 transformClass = transformRegistry[transformClassName]
44 except LookupError:
45 raise RuntimeError(f"Unknown transform class {transformClassName!r}")
46
47 return transformClass.readString(data)