How Prototype and Factory Method Patterns Power Java App ClauseGuard

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A technical walkthrough published on DEV Community explains how two classic design patterns are implemented in ClauseGuard, a Java-based document processing application. The Prototype pattern is used to clone pre-configured legal clause templates — such as StandardClause and HighRiskClause — via a central ClauseRegistry, avoiding costly object reconstruction. The Factory Method pattern handles runtime decisions about document parsing, with separate factories creating PDF or DOCX parsers using Apache PDFBox and Apache POI respectively. Both patterns work together within ClauseGuard's upload pipeline, each solving a distinct construction problem. The article concludes that the key skill lies not in understanding the patterns theoretically, but in recognising which problem each one is suited to solve.

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