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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
39 lines
1 KiB
Python
39 lines
1 KiB
Python
from behavioral.chain_responsibility.concrete_handlers import (
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MonkeyHandler,
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SquirrelHandler,
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DogHandler,
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)
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from behavioral.chain_responsibility.handler import Handler
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def client_code(handler: Handler):
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"""
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The client code is usually suited to work with a single handler. In most
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cases, it is not even aware that the handler is part of a chain.
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"""
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for food in ["Nut", "Banana", "Cup of coffee"]:
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print(f"\nClient: Who wants a {food}?")
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result = handler.handle(food)
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if result:
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print(f" {result}", end="")
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else:
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print(f" {food} was left untouched.", end="")
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if __name__ == "__main__":
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monkey = MonkeyHandler()
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squirrel = SquirrelHandler()
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dog = DogHandler()
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monkey.set_next(squirrel).set_next(dog)
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# The client should be able to send a request to any handler, not just the
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# first one in the chain.
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print("Chain: Monkey > Squirrel > Dog")
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client_code(monkey)
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print("\n")
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print("Subchain: Squirrel > Dog")
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client_code(squirrel)
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