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Petrutiu Mihai
2016-07-20 12:26:22 +03:00
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@@ -489,6 +489,15 @@ Sequence diagram:
* Visitor pattern allows for one or more operation to be applied to a set of objects at runtime, decoupling the operations from the object structure. * Visitor pattern allows for one or more operation to be applied to a set of objects at runtime, decoupling the operations from the object structure.
* Visitor is similar to Iterator, the difference is that visitor pattern allows to process more complex structure with different types * Visitor is similar to Iterator, the difference is that visitor pattern allows to process more complex structure with different types
[VisitorClassDiagram]: https://github.com/MihaiTheCoder/BehavioralPatterns/blob/master/BehavioralPatternsDiagrams/VisitorPattern/VisitorPatternClassDiagram.png "Visitor class diagram"
[VisitorSequenceDiagram]: https://github.com/MihaiTheCoder/BehavioralPatterns/blob/master/BehavioralPatternsDiagrams/VisitorPattern/VisitorPatternSequenceDiagram.png "Visitor sequence diagram"
Class diagram for the visitor pattern:
![alt text][VisitorClassDiagram]
Sequence diagram for the visitor pattern:
![alt text][VisitorSequenceDiagram]
### b. When to use Visitor pattern ### b. When to use Visitor pattern
* Dynamic flavor: When you have a complex structure that doesn't change that much, but you need to add more types of processing * Dynamic flavor: When you have a complex structure that doesn't change that much, but you need to add more types of processing