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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Composite and visitor pattern - A quick primer
Whenever we deal with hierarchies like W3C DOM, document formats, graphics database or abstract syntax tree (AST) of a compiler, we create part/whole relationship. The GoF composite pattern is natural choice for creating hierarchies. Building hierarchies and its processing can be separated using GoF visitor pattern. The visitor pattern visits each node in the hierarchy and perform some action on the node. In a compiler, the tree representation of a program will be processed for type checking, code generation, trans compilation (source to source transformation) and so on. Sometimes people would like to perform additional activities on the tree. It is not feasible to add methods for processing the nodes ...
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