/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/SimDataFormats/CrossingFrame/interface/MixCollection.h

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#ifndef MIX_COLLECTION_H
#define MIX_COLLECTION_H
#include <utility>
#include <string>
#include <vector>

#include "SimDataFormats/CrossingFrame/interface/CrossingFrame.h"

template <class T> 
class MixCollection {

 private:

 public:
  typedef std::pair<int,int> range;
  MixCollection();
  MixCollection(const CrossingFrame<T> *cf, 
                const range bunchRange =range(-999,999));
  MixCollection(std::vector<const CrossingFrame<T> *> cfs, 
                const range bunchRange =range(-999,999));

  range bunchrange() const {return bunchRange_;}
  int size() const {return sizeSignal() + sizePileup();}
  int sizePileup() const;
  int sizeSignal() const;
  // false if at least one of the subdetectors was not found in registry
  bool inRegistry() const {return inRegistry_;}

  // get object the index of which -in the whole collection- is known
   const T & getObject(unsigned int ip) const { 
     if (ip>=(unsigned int)size()) throw cms::Exception("BadIndex")<<"MixCollection::getObject called with an invalid index!"; // ip >= 0, since ip is unsigned
     int n=ip;
/*
-    int iframe=0;
-    for (unsigned int ii=0;ii<crossingFrames_.size();++ii) {
-      iframe=ii;
-      int s=crossingFrames_[iframe]->getNrSignals()+crossingFrames_[iframe]->getNrPileups();
-      if (n<s) break;
*/
    for (unsigned int iframe=0;iframe<crossingFrames_.size();++iframe) {
      int s=crossingFrames_[iframe]->getNrSignals();
      if (n<s) return crossingFrames_[iframe]->getObject(n);
       n=n-s;
     }
/*
    return crossingFrames_[iframe]->getObject(n);
*/
    for (unsigned int iframe=0;iframe<crossingFrames_.size();++iframe) {
      int s=crossingFrames_[iframe]->getNrSignals();
      int p=crossingFrames_[iframe]->getNrPileups();
      if (n<p) return crossingFrames_[iframe]->getObject(s+n);
      n=n-p;
    }
    throw cms::Exception("InternalError")<<"MixCollection::getObject reached impossible condition"; 
   }

  class MixItr;
  friend class MixItr;

  // nested class for iterator
  class MixItr {
  public:

    MixItr():first_(true), internalCtr_(0) {;}
    MixItr(typename std::vector<const T *>::const_iterator it) : pMixItr_(it),nrDets_(0),first_(true),internalCtr_(0) {;}
       MixItr(MixCollection *shc, int nrDets) :     
       mixCol_(shc),nrDets_(nrDets),first_(true),iSignal_(0),iPileup_(0),internalCtr_(0) {;}


    virtual ~MixItr() {;}

    // default version valid for HepMCProduct
    const T* operator->() const { return *(pMixItr_.operator->()); }
    const T& operator*() const {return *(pMixItr_.operator*()); }
    MixItr operator++ () {return next();}
    MixItr operator++ (int) {return next();}
    bool operator!= (const MixItr& itr){return pMixItr_!=itr.pMixItr_;}

    int bunch() const {
      if (trigger_) return 0;
      int bcr= myCF_->getBunchCrossing(internalCtr_);
      return bcr;
    }

    bool getTrigger() const {return trigger_;}

    int getSourceType() const {return (getTrigger() ? -1 : myCF_->getSourceType(internalCtr_));}
    int getPileupEventNr() const {return (getTrigger() ? 0 : myCF_->getPileupEventNr(internalCtr_));}

  private:

    typename std::vector<const T *>::const_iterator pMixItr_;
    typename std::vector<const T *>::const_iterator pMixItrEnd_;

    const CrossingFrame<T> *    myCF_;
    MixCollection *mixCol_;
    int nrDets_;
    bool first_;
    int iSignal_, iPileup_;
    bool trigger_;
    unsigned int internalCtr_;  //this is the internal counter pointing into the vector of piled up objects
    
    MixItr next();
    void reset() {;}
    bool getNewSignal(typename std::vector<const T *>::const_iterator &first,typename std::vector<const T *>::const_iterator &last);

    bool  getNewPileups(typename std::vector<const T *>::const_iterator &first,typename std::vector<const T *>::const_iterator &last) ;
  };

  typedef MixItr iterator;
  iterator begin();
  iterator end() ;

 private:
  void init( const range bunchRange);

  range bunchRange_;
  bool inRegistry_;
  int nrDets_;

  std::vector<const CrossingFrame<T> *> crossingFrames_;

};

#include "SimDataFormats/CrossingFrame/interface/CrossingFrame.h"
//
// Exceptions
//
#include "FWCore/Utilities/interface/Exception.h"
template <class T> 
MixCollection<T>::MixCollection() : 
  bunchRange_(0,0), inRegistry_(false), nrDets_(0)
{
  crossingFrames_.push_back(NULL);
}

template <class T> 
MixCollection<T>::MixCollection(const CrossingFrame<T> *cf,const std::pair<int,int> bunchRange) : 
  inRegistry_(false),nrDets_(0) 
{
  nrDets_=1;
  inRegistry_=true;
  if (cf) {
    crossingFrames_.push_back(cf);
    init(bunchRange);
  }
  else std::cout <<"Could not construct MixCollection for "<<typeid(T).name() <<", pointer to CrossingFrame invalid!"<<std::endl;
} 

template <class T> 
MixCollection<T>::MixCollection(std::vector<const CrossingFrame<T> *> cfs, const std::pair<int,int> bunchRange) :  inRegistry_(false) , nrDets_(0)
{
  // first, verify that all CrossingFrames have the same bunchrange
  range bR=cfs[0]->getBunchRange();
  for (unsigned int i=1;i<cfs.size();++i) {
    if (bR!= cfs[i]->getBunchRange()) throw cms::Exception("Incompatible CrossingFrames")<<"You gave as input CrossingFrames with different bunchRanges!";
  }

  //set necessary variables
  for (unsigned int i=0;i<cfs.size();++i) {
    nrDets_++;
    crossingFrames_.push_back(cfs[i]);
    inRegistry_=true;  // true if at least one is present
  }

  init(bunchRange);
}

template <class T> 
void MixCollection<T>::init( const std::pair<int,int> bunchRange) {

  bunchRange_=bunchRange;

  //verify whether bunchrange is ok
  // in case of several crossingFrames, we have verified before that they have the same bunchrange
  range defaultrange=crossingFrames_[0]->getBunchRange();
  if (bunchRange_==range(-999,999)) bunchRange_=defaultrange;
  else if (bunchRange_!=defaultrange ) {
    int first=defaultrange.first;
    int last = defaultrange.second;
    if (bunchRange_.first<defaultrange.first || bunchRange_.second>defaultrange.second )  throw cms::Exception("BadRunRange")<<" You are asking for a runrange ("<<bunchRange_.first<<","<<bunchRange_.second<<"), outside of the existing runrange ("<<defaultrange.first<<", "<<defaultrange.second<<")\n";
    bunchRange_=range(first,last);
  }
}

template <class T>  int  MixCollection<T>::sizePileup() const {
  // get size cumulated for all subdetectors
  int s=0;
  for (int i=0;i<nrDets_;++i) {
    s+=crossingFrames_[i]->getNrPileups();
  }  return s;
}

template <class T>  int  MixCollection<T>::sizeSignal() const {
  int s=0;
  for (int i=0;i<nrDets_;++i) {
    s+=crossingFrames_[i]->getNrSignals();
  }
  return s;
}

template <class T>
bool MixCollection<T>::MixItr::getNewSignal(typename std::vector<const T *>::const_iterator &first,typename std::vector<const T *>::const_iterator &last) {
  // gets the next signal collection with non-zero size

  while (iSignal_<nrDets_) {
    mixCol_->crossingFrames_[iSignal_]->getSignal(first,last);
    myCF_=mixCol_->crossingFrames_[iSignal_];
    iSignal_++;
    if (first != last) return true;
  }
  return false;
}

template <class T>
bool  MixCollection<T>::MixItr::getNewPileups(typename std::vector<const T*>::const_iterator &first,typename std::vector<const T *>::const_iterator &last) {

  // gets the next pileup collection , changing subdet if necessary
  while (iPileup_<nrDets_) {
    mixCol_-> crossingFrames_[iPileup_]->getPileups(first,last);
    int s=0;
    for (typename std::vector<const T*>::const_iterator it=first;it!= last ;it++) {
      s++;
    }
    myCF_=mixCol_->crossingFrames_[iPileup_];
    iPileup_++;
    if (first!=last) return true;
  }
  return false;
}

template <class T>
typename MixCollection<T>::MixItr MixCollection<T>::MixItr::next() {

  // initialisation
  if (first_) {
    first_=false;
    trigger_=true;
  } else {
    if (!trigger_) internalCtr_++;
    if (++pMixItr_!=pMixItrEnd_) return *this;
  }

  // we have an end condition, look whether there are more collections
  bool ok;
  if (trigger_) {
    ok=this->getNewSignal(pMixItr_,pMixItrEnd_);
    if (ok) return *this;
    trigger_=false;
  } 
  ok=this->getNewPileups(pMixItr_,pMixItrEnd_);
  if (ok) {
    // debug print start
    typename std::vector<const T *>::const_iterator dbIt;
    //    for (dbIt=pMixItr_;dbIt!=pMixItrEnd_;++dbIt)  printf("Found pointer %p\n",(*dbIt));fflush(stdout);
    // debug print end
    internalCtr_=0;
    return *this;
  }
  else {
    return mixCol_->end();
  }
}

template <class T>
typename MixCollection<T>::MixItr MixCollection<T>::begin() {
  return MixItr(this,nrDets_)++;
}

template <class T>
typename  MixCollection<T>::MixItr MixCollection<T >::end() {
  typename std::vector<const T *>::const_iterator first;
  typename std::vector<const T*>::const_iterator last;
  crossingFrames_[nrDets_-1]->getPileups(first, last);
  return last;
}

#include<iosfwd>
#include<iostream>
template <class T>
std::ostream &operator<<(std::ostream& o, const MixCollection<T>& col)
{
  o << "MixCollection with bunchRange: "<<(col.bunchrange()).first<< "," << (col.bunchrange()).second <<" size of signal: "<<col.sizeSignal() <<" ,size of pileup: "<<col.sizePileup();


  return o;
}

#endif