Adapter Design Pattern
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The Adapter pattern allows classes to work together that normally could not because of incompatible interfaces. It converts the interface of a class into another interface that a client expects. Adapters are used to make existing classes work with others without modifying their code by acting as a bridge between incompatible interfaces. Some examples include data adapters that allow different data sources to work with datasets and .NET using runtime callable wrappers as adapters between .NET code and COM objects.
Adapter Design Pattern
- 1. Adapter Pattern Shahriar Iqbal Chowdhury & Monjurul Habib Code Name: Remington http://www.facebook.com/groups/netter/
- 2. What is Adapter • A device for connecting pieces of equipment that cannot be connected directly • An adapter allows classes to work together that normally could not because of incompatible interfaces
- 4. How does it work?
- 5. When we need? • Convert the interface of a class into another interface that client expects. • Allow classes to work together that couldn’t because of incompatible interfaces. • Future clients can be satisfied through the creation of additional concrete Adapter. • Adapter is meant to change the interface of an existing object. • A way to achieve OCP(Open/Closed Principle)
- 6. Client Component
- 7. Client Adapter Component/ Adaptee
- 8. Adapters in the real world
- 10. Way to use (ref. DoFactory)
- 11. Client
- 12. Adapter
- 13. Adaptee
- 15. Adapter @.NET Framework • From .NET-based code you can easily call legacy COM objects and vice versa. • Behind the scenes, Visual Studio® .NET create a Runtime Callable Wrapper (RCW) class. Inside the RCW, .NET specific format is converted into a format that the COM component expects and vise versa. • Data Adapters adapts data from different source (SQL Server, Oracle, ODBC, OLE DB) to dataset. • Different Data Adapter classes are used SqlDataAdapter OdbcDataAdapter OleDbDataAdapter
- 16. Real World Scenario’s • Most of the applications using third party libraries use adapters as a middle layer between the application and the 3rd party library. • Memory card reader software