/data/refman/pasoursint/CMSSW_6_1_2_SLHC4_patch1/src/MagneticField/GeomBuilder/src/bLayer.cc

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// #include "Utilities/Configuration/interface/Architecture.h"

/*
 *  See header file for a description of this class.
 *
 *  $Date: 2009/04/07 15:09:45 $
 *  $Revision: 1.8 $
 *  \author N. Amapane - INFN Torino
 */

#include "MagneticField/GeomBuilder/src/bLayer.h"
#include "MagneticField/VolumeGeometry/interface/MagVolume6Faces.h"
#include "MagneticField/Layers/interface/MagBLayer.h"
#include "MagneticField/Layers/interface/MagVerbosity.h"

#include "Utilities/General/interface/precomputed_value_sort.h"

using namespace SurfaceOrientation;

//The ctor is in charge of finding sectors inside the layer.
MagGeoBuilderFromDDD::bLayer::bLayer(handles::const_iterator begin,
                                        handles::const_iterator end) :
  size(end-begin),
  theVolumes(begin,end),
  mlayer(0) 
{
  // Sort in phi
  precomputed_value_sort(theVolumes.begin(), theVolumes.end(), ExtractPhi());
  
  if (MagGeoBuilderFromDDD::debug) {
    std::cout << " elements: " << theVolumes.size() << " unique volumes: ";
    volumeHandle::printUniqueNames(theVolumes.begin(), theVolumes.end());
  }
  

  // Find sectors in phi
  handles::iterator secBegin = theVolumes.begin();
  handles::iterator secEnd;
  int binOffset = 0;

  const Surface & refSurf = (*secBegin)->surface(outer);

  int newbegin=0;
  int newend=0;  

  // A sector is made of several volumes in R, and, for planar layers
  // (box and traps) also in phi, so it might cross the -phi boundary. 
  // For those, we have to look for the end of first sector and rotate the 
  // vector of volumes.
  // ASSUMPTION: all volumes in a layer must be of compatible type.


  if (size==1) { // Only one volume; this is the case for barrel
    // cylinders.
    // FIXME sectors.push_back(bSector(theVolumes.begin(),theVolumes.end());
    if (MagGeoBuilderFromDDD::debug) std::cout <<"      Sector is just one volume." << std::endl;

  } else if (size==12 || // In this case, each volume is a sector.
             (((*secBegin)->shape()!=ddtrap) && (*secBegin)->shape()!=ddbox)) {
    secEnd = secBegin+size/12;

  }  else { // there are more than one volume per sector.
    float tolerance = 0.025; // 250 micron
    do {
      if (MagGeoBuilderFromDDD::debug) std::cout << (*secBegin)->name 
                                 << " " << (*secBegin)->copyno << std::endl;
      ++secBegin;
    } while ((secBegin != theVolumes.end()) &&
             (*secBegin)->sameSurface(refSurf,outer, tolerance)); // This works only if outer surface is a plane, otherwise sameSurface returns always true!
    
    secEnd = secBegin;
    secBegin = theVolumes.begin()+bin((secEnd-theVolumes.begin())-size/12);;
    newend   = secEnd-theVolumes.begin();
    newbegin = secBegin-theVolumes.begin();
    
    // Rotate the begin of the first sector to the vector beginning.
    rotate(theVolumes.begin(),secBegin,theVolumes.end());
    secBegin = theVolumes.begin();
    secEnd   = secBegin+size/12;

    // Test it is correct...
    if (!((*secBegin)->sameSurface((*(secEnd-1))->surface(outer),
                                   outer, tolerance))) {
      std::cout << "*** ERROR: Big mess while looking for sectors "
                << (*secBegin)->name << " " << (*secBegin)->copyno << " "
                << (*(secEnd-1))->name << " " << (*(secEnd-1))->copyno
                << std::endl;
    }
  }

  if (MagGeoBuilderFromDDD::debug) {
    std::cout << "      First sector: volumes " << secEnd-theVolumes.begin()
         << " from " << newbegin
         << " (phi = " << (*secBegin)->center().phi() << ") "
         << " to " << newend
         << " (phi = " << (*secEnd)->center().phi() << ") "
         << " # " << (*secBegin)->copyno << " ";
    std::cout << GlobalVector( refSurf.rotation().zx(), refSurf.rotation().zy(),
                          refSurf.rotation().zz()) << std::endl;
  }

  if (size!=1) { // Build the 12 sectors
    int offset = size/12;
    sectors.resize(12);
    for (int i = 0; i<12; ++i) {
      int isec = (i+binOffset)%12;
      sectors[isec>=0?isec:isec+12] = bSector(theVolumes.begin()+((i)*offset),
                                              theVolumes.begin()+((i+1)*offset));
    }
  }

  if (MagGeoBuilderFromDDD::debug) std::cout << "-----------------------" << std::endl;

}

MagGeoBuilderFromDDD::bLayer::~bLayer(){}

int MagGeoBuilderFromDDD::bLayer::bin(int i) const {
  i = i%size;
  return (i>=0?i:i+size);
}

// const MagGeoBuilderFromDDD::bSector &
// MagGeoBuilderFromDDD::bLayer::sector(int i) const {
//   i = i%12;
//   return sectors[i>=0?i:i+12];
// }


double MagGeoBuilderFromDDD::bLayer::minR() const {
  // ASSUMPTION: a layer is only 1 volume thick (by construction). 
  return theVolumes.front()->minR();
}

// double MagGeoBuilderFromDDD::bLayer::maxR() const {
//   // ASSUMPTION: a layer is only 1 volume thick (by construction). 
//   return theVolumes.front()->maxR();
// }

MagBLayer * MagGeoBuilderFromDDD::bLayer::buildMagBLayer() const {
  if (mlayer==0) {

    // If we have only one volume, do not build any MagBSector.
    if (sectors.size()==0) {
      if (MagGeoBuilderFromDDD::debug && size!=0) {
        std::cout << "ERROR: bLayer::buildMagBLayer, 0 sectors but "
             << size << " volumes" << std::endl;
      }
      // Technically we might have only one bSector built and we would
      // not need a separate MagBLayer constructor...
      mlayer = new MagBLayer(theVolumes.front()->magVolume, minR());
    }

    // If we have several sectors, create the MagBSector
    std::vector<MagBSector*> mSectors;
    for (unsigned int i=0; i<sectors.size(); ++i) {
      mSectors.push_back(sectors[i].buildMagBSector());
    }
    mlayer = new MagBLayer(mSectors, minR());
  }
  return mlayer;
}