Software Design

Visitor Pattern: Exporting Document AST Nodes

UML Class Diagrams · made in Skemio

UML class diagram demonstrating the Visitor pattern with Node elements (Heading, Paragraph) accepting a DocumentVisitor interface implemented by HtmlExportVisitor.
UML class diagram demonstrating the Visitor pattern with Node elements (Heading, Paragraph) accepting a DocumentVisitor interface implemented by HtmlExportVisitor.
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What it shows

  • Separates document data structures from the operations performed on them.
  • Adds new export targets (Markdown, HTML, PDF) without touching node classes.
  • Uses double dispatch via accept(visitor) to resolve the exact method call.

The takeaway

Use the Visitor pattern when your data structure is stable but operations change often.

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