/////////////////////////////////////////////////////////
/// $Id: IMidasTripTOldHistoItr.cxx,v 1.2 2009/09/25 06:02:32 nickwest Exp $
///
/// Implement the COMET::IMidasTripTOldHistoItr class...

#include "IMidasObj.hxx"
#include "ICOMETLog.hxx"
#include "IMidasItr.cxx"
#include "IMidasTripTOldHistoItr.hxx"
#include "ITripTOldHistoBank.hxx"

// The ProHisto class is for the prototype histogram bank used in the first implementation
// of the DPT.  The ITripTHistoBank and IMidasTripTHisto banks are used for the new
// version of the DPT (developed in July 2009, installed a month or two later).


//_____________________________________________________________________________
    
COMET::IMidasTripTOldHistoItr::IMidasTripTOldHistoItr(const ITripTOldHistoBank* parent) :
  IMidasItr<IMidasTripTOldHisto>(parent->GetRawDataVer(),0,parent,parent->GetNumAllHisto()),
  fParent(parent),
  fPtrStart(parent->GetData16() + RAWDPT_HVS_OFFSET1),
  fDataStart(parent->GetHistoStart()), 
  fDataEOD(fDataStart + parent->GetSize8()),
  fSlotStart(0),
  fSlotEOD(parent->GetNumAllHisto())
{
    // fPtrStart     = parent->GetData16() + RAWDPT_HVS_OFFSET1;

    // fDataStart    = parent->GetData8() + ((RAWDPT_HVS_OFFSET1 + parent->GetNumAllHisto()) << 1); 
          // Inside () is a Short_t offset, fDataStart is UChar_t
    // fDataEOD      = fDataStart + parent->GetSize8();

    this->Rewind();   // Sets fSlotNext and fDataNext
}

//_____________________________________________________________________________
    
COMET::IMidasTripTOldHisto COMET::IMidasTripTOldHistoItr::GetImp() {

    if ( fSlotNext > fSlotEOD ) {
  COMETError("COMET::IMidasTripTOldHistoItr: Bank truncated!");
  fSlotNext = fSlotEOD;
    }
    if ( this->EODImp() ) {
  COMETError("COMET::IMidasTripTOldHistoItr: Requesting object beyond end of set; returning one marked as invalid");
  return IMidasTripTOldHisto(IMidasObj::IteratorOutOfRange);
    }

// Split the fSlotNext into tfb,trip,chan
    UInt_t ch = 16 + fParent->GetNExtraChan();
    UInt_t tt = fSlotNext/ch;   // Integer divide
    UInt_t tfb = tt>>2;
    UInt_t trip = tt&0x3;
    UInt_t chan = fSlotNext % ch;  // Integer remainder    
    IMidasTripTOldHisto histo(fParent->GetEncoding(),fDataNext,fPtrStart[fSlotNext],tfb,trip,chan);

    fDataNext += fPtrStart[fSlotNext]; 
    ++fSlotNext;

    while (!this->EODImp() && (fPtrStart[fSlotNext] == 0)) {  
                                       // Skip directly over missing histograms
     ++fSlotNext;
     // fDataNext += fPtrStart[fSlotNext];   // Superfluous because we have just checked fPtrStart[fSlotNext] == 0;
    }

    return histo;
}