/***************************************************************************
                           TrackParticle.h  -  Description
                              -------------------
     begin   : 27-02-2004
     authors : Andreas Wildauer (CERN PH-ATC), Fredrik Akesson (CERN PH-ATC)
     email   : andreas.wildauer@cern.ch, fredrik.akesson@cern.ch
     changes :
     
  ***************************************************************************/
 #ifndef RECPARTICLE_TRACKPARTICLE_H
 #define RECPARTICLE_TRACKPARTICLE_H
 
 // includes for inheritance
 #include "FourMom/P4PxPyPzE.h"
 #include "Navigation/Navigable.h"
 #include "EventKernel/INavigable4Momentum.h"
 
 // includes for datamembers
 #include "DataModel/ElementLink.h"
 #include "TrkTrack/TrackCollection.h"
 #include "VxVertex/VxContainer.h"
 
 #include "VxVertex/RecVertex.h"
 #include "TrkTrack/Track.h"
 #include "TrkParameters/MeasuredPerigee.h"
 #include "TrkParametersBase/ParametersBase.h"
 #include "TrkTrackSummary/TrackSummary.h"
 #include "TrkTrack/TrackCollection.h"
 #include "TrkEventPrimitives/FitQuality.h"
 
 #include "TrkParticleBase/TrackParticleBase.h"
 #include "SGTools/BaseInfo.h"
 
 class MsgStream;
 
 namespace Rec
 {
   class TrackParticle :
       virtual public INavigable4Momentum,
       public Trk::TrackParticleBase, 
       public P4PxPyPzE ,  
       public NavigableTerminalNode
 
   {
   public:
 
     /** Constructor 0
     standard constructor which sets everything to 0, needed for persistency */
     TrackParticle();
     
     /** 'Beautiful' TrackParticle Constructor. 
     @param  trk Track used to create this object. Since an ElementLink is used to store the object, 
                 setStorableObject(const TrackCollection* trackColl) must be called to set persistency.
     @param  trkPrtOrigin See TrackParticleOrigin for definitions, but should be set to NoVtx if no Trk::VxCandidate pointer is passed.
     @param  vxCandidate Pointer to the Trk::VxCandidate used to create this TrackParticle.
     @param  trkSummary Summary object of this TrackParticle (should be created with Trk::TrackSummaryTool). Will be owned by this TrackParticle.
     @param  parameters std::vector of Trk::ParametersBase which describe this Trk::TrackParticle. Ownership of these Trk::ParametersBase objects passes to TrackParticle 
             (so if you copied them from a Trk::Track, make sure you didn't just copy the pointers but actually created new objects, for example, by using clone() )
     @param  definingParameter The Trk::ParametersBase which defines the charge and 4-momentum of this TrackParticle. 
             This will be appended to the vector of parameters passed before, so please make sure that it is *NOT* already contained in that!
     @param fitQuality Trk::FitQuality which describes this Trk::TrackParticle. Will be owned by this TrackParticle. 
 
 @warning You MUST pass in a valid 'definingParameter' and this 'definingParameter' must NOT be part of the std::vector<const Trk::ParametersBase*> passed.
     */  
     TrackParticle(  const Trk::Track*                                       trk, 
                     const Trk::TrackParticleOrigin                          trkPrtOrigin, 
                     const Trk::VxCandidate*                                 vxCandidate, 
                     const Trk::TrackSummary*                                trkSummary, 
                     std::vector<const Trk::ParametersBase*>&                parameters,
                     const Trk::ParametersBase*                              definingParameter,
                     const Trk::FitQuality*                                  fitQuality);   
  
     /** Copy constructor */
     TrackParticle(const TrackParticle &);
 
     /** Assignment operator */
     TrackParticle &operator= (const TrackParticle &);
     
     /** Destructor */
     virtual ~TrackParticle();  
     
     /** Accessor method for MeasuredPerigee.
     @return MeasuredPerigee used to make this object
     @warning A TrackParticle is REQUIRED to have a Trk::MeasuredPerigee and so this pointer should never be zero, however internally it 
     is cached using a dynamic_cast and so in principle this cast could fail if the object is constructed improperly. 
     There is an assert to test this in debug.
     @warning This method should properly return the MeasuredPerigee by reference,
     but it is a bit late to make interface changes this close to 13.0.0*/
     const Trk::MeasuredPerigee* measuredPerigee() const; 
 
     /** Slimming methods used to reduce the TrackParticle content and size that may be called 
        by users when making DPDs */
 
     /** removeSummary to delete and set summary to null */ 
     void removeSummary();
 
     /** removeFitQuality to delete the fit quality object */
     void removeFitQuality();
 
     /** removeErrorMatrix to delete the error matrix. This uses the cloneWithoutError() method of
        measuredPerigee() to create a Perigee() and replace the existing MeasuredPerigee with a Perigee */
     void removeErrorMatrix();
     
     /** Dump methods to be used by the overloaded stream operator (inheritance!) */
     virtual MsgStream&    dump( MsgStream& out ) const ;
     virtual std::ostream& dump( std::ostream& out ) const ;
     
     /** set 4Momentum (will throw exception if cannot be implemented) */ 
     void set4Mom (const I4Momentum * const theI4Mom );
 
     /** set 4Momentum (will throw exception if cannot be implemented) */
     void set4Mom (const I4Momentum & theI4Mom);
 
     /** set 4Momentum (will throw exception if cannot be implemented) */
     void set4Mom (const HepLorentzVector & theHlv );
 private:
     /**Cached pointer to the MeasuredPerigee (if one was used to create this class).
     It is required that Trk::TrackParticleBase::definingParameters() is actually a MeasuredPerigee. If not then
     this call just returns a 0 pointer.*/
     mutable const Trk::MeasuredPerigee*       m_cachedMeasuredPerigee;
     };
 }
 
 
 SG_BASES2 (Rec::TrackParticle,
            SG_VIRTUAL(INavigable4Momentum),
            Trk::TrackParticleBase);
 
 inline const Trk::MeasuredPerigee* Rec::TrackParticle::measuredPerigee() const
 {
     if (0==m_cachedMeasuredPerigee){
         m_cachedMeasuredPerigee = dynamic_cast<const Trk::MeasuredPerigee*>( &definingParameters() );
     }
     return m_cachedMeasuredPerigee;
 }
   
   /**
   * Overload of << operator for MsgStream for debug output
   */ 
   MsgStream& operator << ( MsgStream& sl, const Rec::TrackParticle& trackParticle);
 
   /**
   * Overload of << operator for std::ostream for debug output
   */ 
   std::ostream& operator << ( std::ostream& sl, const Rec::TrackParticle& trackParticle);
 
 #endif

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