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It is important to note that both the field decoder and encoder classes must be stateless to work properly. The reason is that each UDR decoder or encoder only keeps a single instance of the corresponding field decoder or encoder class.

DRUltraFieldDecoder

A DRUltraFieldDecoder object is instantiated by the UDR decoder to handle all decoding of fields of the corresponding type.

DRUltraFieldEncoder

A DRUltraFieldEncoder object is instantiated by the UDR encoder to handle all encoding of fields of the corresponding type.