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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import typing as ty
_T = ty.TypeVar('_T')
class Formatter(ty.Generic[_T]):
@classmethod
def deserialize(cls, value: ty.Any) -> _T:
"""Return a formatted object representing the value"""
raise NotImplementedError
class BoolStr(Formatter[bool]):
@classmethod
def deserialize(cls, value: ty.Any) -> bool:
"""Convert a boolean string to a boolean"""
expr = str(value).lower()
if "true" == expr:
return True
elif "false" == expr:
return False
else:
raise ValueError(f"Unable to deserialize boolean string: {value}")
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