Chain of Responsibility in Java

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Chain of Responsibility
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The Chain of Responsibility pattern allows a sender to issue a request
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to a series or chain of objects and allowing each object a chance to handle the request The receiving objects pass the request along until some object handles the request An example is a context sensitive help system that will pass a request for help along a chain until the appropriate object can provide the help
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Command
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The Command pattern provides a way to encapsulate a command request as an object without the object that issues the command needing to know what the response will be An example is a GUI menu system that will issue a command in response to a menu selection Any menu command can issue a request to a Command object in a uniform way without having to know how the object will handle the command
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Interpreter
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The Interpreter pattern recognizes that sometimes it is better to define a language with a grammar, and to provide an interpreter for that language An object that can recognize and respond to a regular expression search pattern is an example that can use the Interpreter pattern
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Iterator
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The Iterator pattern is used to provide a means to access all the elements of some collection of objects sequentially without exposing the collection's internal representation The Iterator is so common and useful that Java provides iterators for its collection objects as a standard feature
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Mediator
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The Mediator pattern is used to define an object that knows how to
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use several other objects, and to provide a means for those objects to refer to each other using the Mediator instead of directly This increases encapsulation and decreases coupling
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Memento
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The Memento pattern is used to capture and save the current state of an object without violating its encapsulation For example, an editor program would use the Memento pattern to save the state of whatever was being edited so that it could be restored via an undo command
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Observer
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The Observer pattern is used when any number of objects (the Observers) need to be notified automatically whenever another object (the Observable) changes its state
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State
The State pattern is used to allow an object to change its behavior depending on how its internal state is changed An example is a network monitoring object that will change its behavior depending on whether the network connection is open or closed
Strategy
The Strategy pattern is used to define a family of interchangeable algorithms The client will be able to use the object that implements the Strategy without necessarily knowing which strategy is used, or how it differs from other strategies An example might be a Strategy that implements different sort algorithms, with each algorithm appropriate for different kinds of data
Template Method
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The Template Method is used to define an operation as a superclass whose implementation will be deferred to subclasses This lets the subclasses redefine an operation without affecting how the method is used
Visitor
The Visitor pattern is used to perform an operation on some structure of objects The Visitor allows new operations to be defined without changing any of the elements that are part of the structure An example would be visiting each leaf of a tree of objects to perform some operation
Example Design Patterns used by Wmvc and MovieCat
Because design patterns can be so useful, it should be no surprise that several design patterns can show up in even small applications The Wmvc framework and the MovieCat applications that we covered in 5 and 6 use several patterns We will discuss some of the details of using the patterns in this section MVC The GoF Design Patterns doesn't call Model/View/Controller a design pattern Instead, it uses MVC as a higher level design that can be implemented using patterns However, in other sources, MVC itself is called a design pattern Since we've covered MVC is some detail already, we won't cover it again here However, we will look at how the Wmvc framework uses two of the GoF design patterns for its implementation Observer Pattern
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