#!/usr/bin/env python3

# -*- coding: utf-8 -*-

__author__ = "ipetrash"

# SOURCE: Design Patterns: Prototype - Прототип

# SOURCE: https://ru.wikipedia.org/wiki/Прототип_(шаблон_проектирования)#Пример_на_Python

import copy

from typing import Any

class Prototype:

def __init__(self) -> None:

self._objects = dict()

def register_object(self, name, obj) -> None:

"""Register an object"""

self._objects[name] = obj

def unregister_object(self, name) -> None:

"""Unregister an object"""

self._objects.pop(name)

def clone(self, name, **attr) -> Any:

"""Clone a registered object and update inner attributes dictionary"""

obj = copy.deepcopy(self._objects.get(name))

obj.__dict__.update(attr)

return obj

if __name__ == "__main__":

class A:

def __init__(self) -> None:

self.x = 3

self.y = 8

self.z = 15

self.garbage = [38, 11, 19]

def __str__(self) -> str:

return f"A({self.x}, {self.y}, {self.z}, {self.garbage})"

a = A()

prototype = Prototype()

prototype.register_object("object_a", a)

b = prototype.clone("object_a")

c = prototype.clone("object_a", x=1, y=2, garbage=[88, 1])

for x in (a, b, c):

print(x)

# A(3, 8, 15, [38, 11, 19])

# A(3, 8, 15, [38, 11, 19])

# A(1, 2, 15, [88, 1])