A good example of how encapsulating related functions as static helper/builder class methods (that can be reverse engineered to UML) brings immediate advantage to both the code organisation and the UML diagramming, without even considering in detail yet how this might be handled as an object.
This helper/builder class can create both a non-AJAX and an AJAX-aware entity type filter form element, as well as offering some helper functions for the actual filtering against entity type.
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