Prashanth Hs

7/30/2019 Prashanth Hs

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STRUCTURAL DESIGNPATTERNS

Presentedby

PRASHANTH HS


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STRUCTURAL DESIGN PATTERN

Structural design patterns can be used to organize your programgroups. This segregation will provide you clarity and will enable easier maintainability.


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TYPES OF STRUCTURAL DESIGN PATTRENS

1) FCADE PATTERN

2) BRIDGE PATTERN

3) DECORATOR PATTERN

4) ADAPTER PATTERN


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FCADE PATTERN

FCADE pattern provide a unified interface to a set of interfacesin a subsystem. Facade Pattern defines a higher-level interfacethat makes the subsystem easier to use.


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EXAMPLE OF FCADE PATTERN

In the above design Mercides factory creates family car andsports cars and audi factory also creates both family and sportscars. Car factory has family car and sports cars of both factory.Driver drives family car and sports cars of audi factory andmercedes factory. Thus creates unified interface b/w family car

and sports car classes .this is refferd as FCADE design pattern.


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BRIDGE PATTERN

Decouple an abstraction from its implementation so that thetwo can vary independently is the intent for bridge designpattern.

Bridge design pattern is a modified version of the notion

of prefer composition over inheritance.

It creates two different hierarchies. One for abstraction andanother for implementation.


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EXAMPLE OF BRIDGE PATTERN

Workshop can manufacture bike and also car but it violatesfundamental principle of objects:an object should responsible foitself.workshop should know specific information about vehcle(i.e type of vehcle)in order to manufacture them.shapes wouldntneed to know what type of workshop object used because I could

have vehcles refer to the workshop class. In the above designvehcle uses workshop to manifest its bahavior.


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DECORATOR PATTERN

To extend or modify the behaviour of an instance at runtimedesign pattern is used. Inheritance is used to extend the abilitiesof a class. Unlike inheritance, you can choose any single object ofa class and modify its behaviour leaving the other instancesunmodified.


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EXAMPLE OF DECORATOR PATTERN

In the above design SAMPLE ICECREAM is the concretecomponent. HONEY DECORATOR adds honey and NUTTYDECORATOR adds honey. Both are used with ICECREAM . ThenICECREAM is prepared with adding required amount of honeyand nutts. This is reffered as DEECORATOR PATTERN.


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ADAPTER PATTERN

An adapter helps two incompatible interfaces to work togetheAdapter design pattern is used when you want two differentclasses with incompatible interfaces to work together. The namsays it all. Interfaces may be incompatible but the inner

functionality should suit the need.


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EXAMPLE OF ADAPTER PATTERN

player is used to play audio and video songs. The windowsmedia plays .mp4, .mp3 files but not play .vob, .flv . To play thesetypes of files we adopt the vlc media player.


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Thank You..

Prashanth Hs

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