adapter.md

Adapter Design Pattern

Bridge between incompatible interfaces

In a nutshell, the adapter Design Pattern is a powerful tool for building flexible and future-proof software by creating bridges between incompatible interfaces.

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Flow

1. Client wants "A", adaptee provides "B".
2. Adapter wraps "B" and pretends to be "A".
3. Client interacts with adapter, unaware of "B".

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Benefits

• Increased compatibility Existing code and new code can work together without modifying their original interfaces.
• Improved flexibility Makes code more adaptable to changes in requirements or external components.
• Enhanced reusability Adapters promote code reuse by allowing objects to work with different interfaces.
• Simplified integration Integrating third-party libraries or legacy systems becomes smoother.

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Example

# Target interface: the interface the client expects
class Target:
    def request(self):
        pass

# Adaptee: the existing class with a different interface
class Adaptee:
    def specific_request(self):
        print("Adaptee's specific request")

# Adapter: bridges the gap between Target and Adaptee
class Adapter(Target):
    def __init__(self, adaptee):
        self.adaptee = adaptee

    def request(self):
        self.adaptee.specific_request()

# Client code
client = Client()
adapter = Adapter(Adaptee())
client.do_something(adapter)  # Client interacts with the adapter seamlessly

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Remember

• Use adapters when existing interfaces pose a compatibility issue, not just for minor differences.
• Overusing adapters can lead to a complex code structure. Balance is key.