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The Adapter pattern is found wherever there is code to be wrapped up and redirected to a different implementation. In 2002, Nigel Horspool and I developed a system called Views that enabled an XML specification of a Windows GUI to run on the cross-platform version of Windows called Rotor. The Views engine ran with the GUI program and adapted Views method calls to Windows calls. That benefited the clients (students) because they could use a simpler interface to GUI programming.
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Adapter Pattern
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A subsequent advantage was that Vista, the successor to Windows XP, used the same approach. At the time, it was a long way around to get Windows forms, but the adaptation paid off later. In 2004, the backend of the Views engine was ported by Basil Worrall to QT4, a graphics toolkit running on Linux. Immediately, all applications that were using Views for GUI programming became independent of Windows and could run with the Mono .NET Framework on Linux. The Views engine was therefore a pluggable adapter. (Our paper describing the approach is referenced in the Bibliography at the end of the book.)
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Use the Adapter pattern when You have: A domain-specific interface. A class to connect to with a mismatching interface. You want to: Create a reusable class to cooperate with yet-to-be-built classes. Change the names of methods as called and as implemented. Support different sets of methods for different purposes. Choose the Adapter you need Class adapter Simple and versatile, invisible to the client. Object adapter Extensible to subclasses of the adapter. Two-way adapter Enables different clients to view an object differently. Pluggable adapter Presence of adapter is transparent; it can be put in and taken out Several adapters can be active.
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1. Consider the Seabird program. Would it be possible to instantiate an Aircraft object instead of a Seacraft object and change the methods inside Seabird accordingly If so, make the changes. If not, explain how the present program would need to be altered to enable this and then make the changes. 2. Add a SuperPoke button to CoolBook, enabling one user to send a message to another. 3. Having two different communities for SpaceBook and CoolBook is clearly a disadvantage. Assume you can make minor changes to the SpaceBook, MySpaceBook, and MyOpenBook classes, and see whether you can remove the community collection from MyCoolBook, routing all accesses back through MyOpenBook to SpaceBook.
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4: Structural Patterns: Adapter and Fa ade
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Fa ade Pattern
Role
The role of the Fa ade pattern is to provide different high-level views of subsystems whose details are hidden from users. In general, the operations that might be desirable from a user s perspective could be made up of different selections of parts of the subsystems.
Illustration
Simple interfaces to complex subsystems abound in real life. They can be created to make frequent use of a system faster, or to differentiate between novices and power users. A good illustration is Amazon.com s 1-Click system (Figure 4-4), which simplifies the process of ordering items for well-known customers. Normally, after selecting an item to purchase, an Amazon customer has to enter delivery and bank account details before the order is accepted. If these details are stored and the customer verifies her identity in some way, 1-Click takes that customer straight to the checkout. The customer s stored bank account details and selected delivery address are used for the purchase, thus considerably speeding up (and simplifying) the ordering process. Thus, the 1-Click option forms a fa ade to the fuller system underneath.
Design
Hiding detail is a key programming concept. What makes the Fa ade pattern different from, say, the Decorator or Adapter patterns is that the interface it builds up can be entirely new. It is not coupled to existing requirements, nor must it conform to existing interfaces. There can also be several fa ades built up around an existing set of subsystems. The term subsystem is used here deliberately; we are talking at a higher level than classes. See the UML diagram in Figure 4-5; it considers the subsystems to be grouped together, so they can interact in agreed ways to form the top-level operations.
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