mirror of
https://github.com/rjNemo/design-patterns
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* doc: create package & update general TOCs * doc: add documentation * add code example * reformat using black
44 lines
1.2 KiB
Python
44 lines
1.2 KiB
Python
from behavioral.command.command import Command
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from behavioral.command.receiver import Receiver
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class SimpleCommand(Command):
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"""
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Some commands can implement simple operations on their own.
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"""
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def __init__(self, payload: str) -> None:
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self._payload = payload
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def execute(self) -> None:
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print(
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f"SimpleCommand: See, I can do simple things like printing ({self._payload})"
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)
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class ComplexCommand(Command):
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"""
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However, some commands can delegate more complex operations to other
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objects, called "receivers."
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"""
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def __init__(self, receiver: Receiver, a: str, b: str) -> None:
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"""
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Complex commands can accept one or several receiver objects along with
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any context data via the constructor.
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"""
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self._receiver = receiver
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self._a = a
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self._b = b
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def execute(self) -> None:
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"""
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Commands can delegate to any methods of a receiver.
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"""
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print(
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"ComplexCommand: Complex stuff should be done by a receiver object", end=""
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)
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self._receiver.do_something(self._a)
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self._receiver.do_something_else(self._b)
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