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#ifndef Alignment_KalmanAlignmentAlgorithm_KalmanAlignmentMetricsCalculator_h
#define Alignment_KalmanAlignmentAlgorithm_KalmanAlignmentMetricsCalculator_h


#include "Alignment/CommonAlignment/interface/Alignable.h"

#include "Alignment/CommonAlignment/interface/StructureType.h"
#include "CondFormats/Alignment/interface/Definitions.h"

#include "TTree.h"
#include "TFile.h"


class KalmanAlignmentMetricsCalculator
{

public:

  typedef std::map< Alignable*, short int > SingleDistancesList;
  typedef std::map< Alignable*, SingleDistancesList* > FullDistancesList;

  KalmanAlignmentMetricsCalculator( void );
  ~KalmanAlignmentMetricsCalculator( void );

  void updateDistances( const std::vector< Alignable* >& alignables );

  const SingleDistancesList& getDistances( Alignable* i ) const;

  short int operator() ( Alignable* i, Alignable* j ) const;

  inline void setMaxDistance( short int maxDistance ) { theMaxDistance = maxDistance; }

  unsigned int nDistances( void ) const;

  void clear( void );

  const std::vector< Alignable* > alignables( void ) const;

  void writeDistances( std::string filename );
  void readDistances( std::string filename );

private:

  void clearDistances( FullDistancesList& dist );

  void updateList( SingleDistancesList* thisList, SingleDistancesList* otherList );

  void insertUpdatedDistances( FullDistancesList& updated );

  void insertPropagatedDistances( FullDistancesList& propagated );

  void extractPropagatedDistances( FullDistancesList& changes, Alignable* alignable,
                                   SingleDistancesList* oldList, SingleDistancesList* newList );

  void connect( FullDistancesList& changes, SingleDistancesList* connection,
                Alignable* alignable, short int value );

  void insertDistance( FullDistancesList& dist, Alignable* i, Alignable* j, short int value );
  void insertDistance( SingleDistancesList* distList, Alignable* j, short int value );

  FullDistancesList theDistances;
  short int theMaxDistance;

  SingleDistancesList theDefaultReturnList;

  // For reading and writing

  void createBranches( TTree* tree );
  void setBranchAddresses( TTree* tree );

  align::ID theAli1Id, theAli2Id;
  align::StructureType theAli1ObjId, theAli2ObjId;
  int theDist;
};


#endif