January 2017
Intermediate to advanced
314 pages
6h 42m
English
Content preview from .NET Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Visitor pattern for document traversal
The tree-structured DOM created by us needs to be traversed to produce the content in an output format like HTML, PDF, or SVG.
Note
The composite tree created by us can be traversed using the GoF visitor pattern. Wherever composite pattern is used for composing an hierarchy of objects, the visitor pattern is a natural choice for the traversal of the tree.
In a visitor pattern implementation, every node in the composite tree will support a method called accept, which takes a visitor concrete class as a parameter. The job of the accept routine is to reflect the call to the appropriate visit method in the visitor concrete class. We declare an interface named IDocumentVisitor with methods for visiting each of the ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.