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173 lines (130 loc) · 4.78 KB
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"""
A class that uses different static functions depending on a parameter passed
during initialization. Uses a single dictionary instead of multiple conditions.
"""
__author__ = "Ibrahim Diop <ibrahim@sikilabs.com>"
class Catalog:
"""catalog of multiple static methods that are executed depending on an init parameter"""
def __init__(self, param: str) -> None:
# dictionary that will be used to determine which static method is
# to be executed but that will be also used to store possible param
# value
self._static_method_choices = {
"param_value_1": self._static_method_1,
"param_value_2": self._static_method_2,
}
# simple test to validate param value
if param in self._static_method_choices.keys():
self.param = param
else:
raise ValueError(f"Invalid Value for Param: {param}")
@staticmethod
def _static_method_1() -> str:
return "executed method 1!"
@staticmethod
def _static_method_2() -> str:
return "executed method 2!"
def main_method(self) -> str:
"""will execute either _static_method_1 or _static_method_2
depending on self.param value
"""
return self._static_method_choices[self.param]()
# Alternative implementation for different levels of methods
class CatalogInstance:
"""catalog of multiple methods that are executed depending on an init
parameter
"""
def __init__(self, param: str) -> None:
self.x1 = "x1"
self.x2 = "x2"
# simple test to validate param value
if param in self._instance_method_choices:
self.param = param
else:
raise ValueError(f"Invalid Value for Param: {param}")
def _instance_method_1(self) -> str:
return f"Value {self.x1}"
def _instance_method_2(self) -> str:
return f"Value {self.x2}"
_instance_method_choices = {
"param_value_1": _instance_method_1,
"param_value_2": _instance_method_2,
}
def main_method(self) -> str:
"""will execute either _instance_method_1 or _instance_method_2
depending on self.param value
"""
return self._instance_method_choices[self.param].__get__(self)() # type: ignore
# type ignore reason: https://github.com/python/mypy/issues/10206
class CatalogClass:
"""catalog of multiple class methods that are executed depending on an init
parameter
"""
x1 = "x1"
x2 = "x2"
def __init__(self, param: str) -> None:
# simple test to validate param value
if param in self._class_method_choices:
self.param = param
else:
raise ValueError(f"Invalid Value for Param: {param}")
@classmethod
def _class_method_1(cls) -> str:
return f"Value {cls.x1}"
@classmethod
def _class_method_2(cls) -> str:
return f"Value {cls.x2}"
_class_method_choices = {
"param_value_1": _class_method_1,
"param_value_2": _class_method_2,
}
def main_method(self) -> str:
"""will execute either _class_method_1 or _class_method_2
depending on self.param value
"""
return self._class_method_choices[self.param].__get__(None, self.__class__)() # type: ignore
# type ignore reason: https://github.com/python/mypy/issues/10206
class CatalogStatic:
"""catalog of multiple static methods that are executed depending on an init
parameter
"""
def __init__(self, param: str) -> None:
# simple test to validate param value
if param in self._static_method_choices:
self.param = param
else:
raise ValueError(f"Invalid Value for Param: {param}")
@staticmethod
def _static_method_1() -> str:
return "executed method 1!"
@staticmethod
def _static_method_2() -> str:
return "executed method 2!"
_static_method_choices = {
"param_value_1": _static_method_1,
"param_value_2": _static_method_2,
}
def main_method(self) -> str:
"""will execute either _static_method_1 or _static_method_2
depending on self.param value
"""
return self._static_method_choices[self.param].__get__(None, self.__class__)() # type: ignore
# type ignore reason: https://github.com/python/mypy/issues/10206
def main():
"""
>>> test = Catalog('param_value_2')
>>> test.main_method()
'executed method 2!'
>>> test = CatalogInstance('param_value_1')
>>> test.main_method()
'Value x1'
>>> test = CatalogClass('param_value_2')
>>> test.main_method()
'Value x2'
>>> test = CatalogStatic('param_value_1')
>>> test.main_method()
'executed method 1!'
"""
if __name__ == "__main__":
import doctest
doctest.testmod()