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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information:
//      Copyright (C) 1998      Caltech, UCSB
//
//    Alexei Dvoretskii     2001-2002
//------------------------------------------------------------------------

// Abstract amplitude factory parameterized by a vector of 
// strings. Derived classes construct the amplitude, and PDFs for sampling
// points.

#ifndef EVT_AMP_FACTORY_HH
#define EVT_AMP_FACTORY_HH

#include <vector>
#include <string>
#include <stdio.h>
#include "EvtGenBase/EvtAmplitudeSum.hh"
#include "EvtGenBase/EvtPdfSum.hh"
#include "EvtGenBase/EvtMultiChannelParser.hh"
#include "EvtGenBase/EvtAmpPdf.hh"
#include "EvtGenBase/EvtPdfMax.hh"
#include "EvtGenBase/EvtMacros.hh"

template <class T>
class EvtAmpFactory {  
public:

  EvtAmpFactory() 
    : _amp(0), _ampConj(0), _pc(0), _dm(0.), _verbose(false)
  {}

  EvtAmpFactory(const EvtAmpFactory<T>& other) 
    : 
    _amp(other._amp ? (EvtAmplitudeSum<T>*) other._amp : 0),
    _ampConj(other._ampConj ? (EvtAmplitudeSum<T>*) other._ampConj : 0),
    _pc(other._pc ? (EvtPdfSum<T>*) other._pc : 0),
    _dm(other._dm),
    _verbose(other._verbose)
  {}
  
  virtual ~EvtAmpFactory()
  {
    if(_amp) delete _amp;
    if(_ampConj) delete _ampConj;
    if(_pc) delete _pc;
  }

  virtual EvtAmpFactory<T>* clone() const = 0;
  
  virtual void build(const EvtMultiChannelParser& parser, int nItg)
  {
    _amp = new EvtAmplitudeSum<T>();
    _ampConj = new EvtAmplitudeSum<T>();
    _pc = new EvtPdfSum<T>();

    printf("Amplitude with %d terms\n",parser.getNAmp());
    int i;
    for(i=0;i<parser.getNAmp();i++) {
      
      std::vector<std::string> v = parser.amp(i);
      EvtComplex c = parser.ampCoef(i);
      processAmp(c,v);
    }
    
    printf("Conj. amplitude with %d terms\n",parser.getNAmpConj());
    for(i=0;i<parser.getNAmpConj();i++) {      

      std::vector<std::string> v = parser.ampConj(i);
      EvtComplex c = parser.ampConjCoef(i);
      processAmp(c,v,true);
    }
   
    printf("Calculating pole compensator integrals %d steps\n",nItg);
    if(nItg > 0) _pc->getItg(nItg);
 
    printf("End build\n");
  }
  
  virtual void processAmp(EvtComplex c, std::vector<std::string> v, bool conj = false) = 0;

  inline bool isCPModel() const { return (_ampConj->nTerms() > 0 ? true : false); } 
  inline double dm() const { return _dm; }

  void setVerbose() { _verbose = true; }


  EvtAmplitudeSum<T>* getAmp() const { return _amp; }
  EvtAmplitudeSum<T>* getAmpConj() const { return _ampConj; }
  EvtPdfSum<T>* getPC() const { return _pc; }
  EvtAmplitude<T>* getAmp(int i) const { return _amp->getTerm(i); }
  EvtPdf<T>* getPC(int i) const { return _pc->getPdf(i); }
  const char* compName(int i) const { return _names[i].c_str(); }

  EvtComplex getCoeff(int i) const { return _amp->c(i); }

  double getTermCoeff(int i) const { return abs2(_amp->c(i)); }
  double getTermCoeff(int type, int i, int j) const
  {
    switch(type) {

    case 0: return 2*real(_amp->c(i)*conj(_amp->c(j)));  //posre
    case 1: return -2*real(_amp->c(i)*conj(_amp->c(j))); //negre
    case 2: return -2*imag(_amp->c(i)*conj(_amp->c(j)));  //posim
    case 3: return 2*imag(_amp->c(i)*conj(_amp->c(j)));  //negim
    default: assert(0);
    }
  }
  
protected:

  EvtAmplitudeSum<T> *_amp;      // _owned_ amplitude
  EvtAmplitudeSum<T> *_ampConj;  // _owned_ conjugate amplitude
  EvtPdfSum<T> *_pc;             // _ownded_ pole compensator
  std::vector<std::string> _names;     // names of partial amplitudes
  
  double _dm;                   // Mass difference for conjugate amplitude
  bool _verbose;
};


#endif

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