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Uncommon Design Patterns
The document introduces several uncommon design patterns: 1) Null Object pattern avoids using null values by implementing a "null" object that respects the expected interface. 2) Encapsulated Context pattern encapsulates common services/data needed by different components in a single context object rather than using global objects. 3) Role Object pattern handles modeling problems where an element can have different roles by using role objects that are added to and removed from a core object. 4) ISP & Object Adaptation pattern allows objects to adapt to different protocols by checking for direct implementation, using registered adapters, or throwing exceptions. 5) Essence pattern uses an "essence" class to encapsulate an object's configuration and
