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/BdbTag/BdbFastTagTFloatIter.hh

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//--------------------------------------------------------------------------
// File and Version Information:
//      $Id: BdbFastTagTFloatIter.hh,v 1.3 2002/08/19 18:59:34 becla Exp $
//
// Description:
//      Class BdbFastTagTFloatIter. Interface definition file for 
//      the float iterator for the persistent tag wrapper
//
// Environment:
//      Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author List:
//      Yemi Adesanya                Original Author
//
// Copyright Information:
//      Copyright (C) 2002              Lawrence Berkeley Laboratory
//
//------------------------------------------------------------------------

#ifndef BDBFASTTAGTFLOATITER_HH
#define BDBFASTTAGTFLOATITER_HH

//-----------------
// BaBar Headers --
//-----------------
#include "BaBar/BaBar.hh"

//----------------------
// Base Class Headers --
//----------------------
#include "AbsEventTag/AbsEventTagFloatIter.hh"

//-------------------------------
// Collaborating Class Headers --
//-------------------------------
#include "rw/tvhdict.h"
#include "rw/cstring.h"

//              ---------------------
//              -- Class Interface --
//              ---------------------
 
/**
 ** The BdbFastTagTFloarIter class. This is an interface for the iterator
 ** that retrives float tag elements from the persistent event tag wrapper.
 **
 ** The event tag contains named integer, float and boolean elements. The
 ** name of each element must be unique, independent of the data type.
 **
 ** Copyright (C) 2002              Lawrence Berkeley National Laboratory
 **
 ** @version $Id: BdbFastTagTFloatIter.hh,v 1.3 2002/08/19 18:59:34 becla Exp $ 
 **
 ** @author (David R. Quarrie)          Originator
 **/

class BdbFastTagTFloatIter : public AbsEventTagFloatIter{

//--------------------
// Instance Members --
//--------------------

public:

    // Constructors
    BdbFastTagTFloatIter( BdbFastTagT& theFastTagT )
        : _theFastTagT(theFastTagT),
          _fid(0) ,
          _returnedFloats(0),
          _key(),
          _nFields(theFastTagT._theDescr.noOfFields()),
          _maxFloats(theFastTagT.numberOfFloats()),
          _value(false)
    {


    }

  // Destructor
    virtual ~BdbFastTagTFloatIter()
    {

    }

    // Operations

    /**
     ** Return the next float element from the current tag. The
     ** function value indicates whether a new element was located
     ** or whether the iterator was exhausted.
     **/
    virtual bool next( )
    {
        
        if( _returnedFloats >= _maxFloats){
            return false; 
        }

        HepExplorableFieldType type = eTypeUnused;

        
        for(; (type != eTypeFloat) && (_fid < _nFields); _fid++){            
            type = _theFastTagT._theDescr.getFieldTypeById( _fid );
        } 

        if(type == eTypeUnused){
            return false;
        }

        _returnedFloats++;
        const char* newkey= _theFastTagT._theDescr.getFieldNameById(_fid -1);
        _key = newkey;
        return _theFastTagT.getFloat(_value,newkey);
    
       
    }

    /**
     ** Return the name of the current boolean element within the tag.
     **/
    virtual const char* key( )
    {
        return _key.c_str();
    }

    /**
     ** Return the value of the current boolean element within the tag.
     **/
    virtual float value( )
    {
        return _value;
    }

private:

    int _fid;
    BdbFastTagT _theFastTagT;
    int _returnedFloats;
    int _maxFloats;
    int _nFields;
    float _value;
    std::string _key;
};

#endif

 

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Page Owner: Jacek Becla
Last Update: October 04, 2002