code: public VPDPage getVPDPage(int pageCode)
     {
        switch (pageCode)
        {
           case SupportedVPDPages.PAGE_CODE :
              return supportedVPDPages;
           case DeviceIdentificationVPD.PAGE_CODE :
              return deviceIdentificationVPD;
           default :
              return null;
        }
     }
docs: Returns null if a VPD is not found.
  <p>
  This method must be overridden if the another
  implementation of {@link InquiryDataRegistry} is written that contains pages that are not
  encapsulated in this abstract {@link InquiryDataRegistry}.
  
  @param pageCode
  @return