Design Patterns

In: Computers and Technology

Submitted By gokukaise
Words 1139
Pages 5
Design Patterns
Jon Jensen
July 2, 2012
Ken Murphy

Design Patterns
Out of all of the different design patterns the three that this paper will focus on will be the Adapter, Model–View–Controller or (MVC), and Data Access Object or (DAO). This paper will compare all three of them and try to show which one will be used for what type of project and why it was chosen to do it.
The first design that we will look at is the Adapter design which helps reuse an object or a method by adapting its interface into a more common one. The adapter pattern translates one interface for a class into a compatible interface for a new class. An adapter allows the classes to work together when they normally could not because of their incompatible interfaces. The adapter also transforms data into an appropriate form. For example, if multiple Boolean values are stored as a single integer but the client requires a 'true'/'false', the adapter would extract the appropriate values from the integer. Another example would be transforming the format of a date for instance MM/DD/YYYY to DD/MM/YYYY or YYYY/MM/DD). The adapter design is about creating an intermediary abstraction that translates the old component to a new system.

The Adapter pattern lets incompatible classes work with the interface of one class by converting it into the interface that is expected by the clients. For instance a socket wrench is a good example of an Adapter. A socket will attach to a wrench as long as the size of the drive is the same. A typical drive size in the US is 1/2” and 1/4”. There is no way a 1/2” drive on a wrench will fit in to a 1/4” drive socket unless you use an adapter. Using a 1/2” to 1/4” adapter will allow a 1/2” female connection to fit on the 1/2” drive on a wrench, and a 1/4” male connection will fit in the 1/4” drive socket.
The main reason for this pattern is for a class that…...

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