# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see .
#
# Copyright(C) 2013-2018 Max-Planck-Society
#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.
from ..operators import LinearOperator
class SelectionOperator(LinearOperator):
def __init__(self, domain, key):
from ..multi import MultiDomain
if not isinstance(domain, MultiDomain):
raise TypeError("Domain must be a MultiDomain")
self._target = domain[key]
self._domain = domain
self._key = key
@property
def domain(self):
return self._domain
@property
def target(self):
return self._target
@property
def capability(self):
return self.TIMES | self.ADJOINT_TIMES
def apply(self, x, mode):
self._check_input(x, mode)
if mode == self.TIMES:
return x[self._key].copy()
else:
from ..multi import MultiField
return MultiField({self._key: x})