#ifndef OAEVENT_IRECONHIT_HXX
#define OAEVENT_IRECONHIT_HXX


#include "IHit.hxx"

namespace COMET {
    class IReconHit;
    class IWritableReconHit;

    OA_EXCEPTION(EReconHitIllegal,EoaCore);
}

/// A calibrated hit detector element where the hit information has
/// been reconstructed from the raw hits.  A IReconHit object represents a hit
/// that has been generated from one or more hits associated with a geometry
/// object.  A common usage is to represent a hit that has been constructed
/// from two hits on a bar that is read out at both ends.  The IHit objects
/// combined in a IReconHit must all come from the same geometry object
/// (i.e. the same bar or TPC MM).  If you need to combine hits from different
/// geometry objects, use a IReconCluster.
///
/// The IReconHit class can't be directly instantiated.  It is created
/// using the IWritableReconHit class and is accessed as a IHit class.
class COMET::IReconHit : public IHit {
public:
    IReconHit();
    IReconHit(const IWritableReconHit& val);
    virtual ~IReconHit();

protected:

    ClassDef(IReconHit,7);
};



/// Provide a writable interface to a IReconHit that can be used to fill the
/// object.  All of the IHit objects added to a single IReconHit object must
/// be in the same geometry object (e.g. all in the save bar).  The geometry
/// information (i.e. the geometry id, spread, &c) is taken from the first
/// hit.  The other hits are not used by this class, but are checked to make
/// sure that they are in the same geometry volume.  If you need to combine
/// hits from different geometry volumes, use a IReconCluster.
class COMET::IWritableReconHit : public IReconHit {
public:
    IWritableReconHit(const IWritableReconHit& h);

    /// A "convenience" constructor for the case where there is one
    /// constituent.  This sets the constituent fields, but the position,
    /// time, &c are not initialized.  These fields and their uncertainties
    /// must be set using SetCharge, SetTime, &c.
    explicit IWritableReconHit(COMET::IHandle<COMET::IHit> hit);

    /// A "convenience" constructor for the case where there are two
    /// constituents.  This sets the constituent fields, but the position,
    /// time, &c are not initialized.  These fields and their uncertainties
    /// must be set using SetCharge, SetTime, &c.
    explicit IWritableReconHit(COMET::IHandle<COMET::IHit> hit1,
                               COMET::IHandle<COMET::IHit> hit2);

    virtual ~IWritableReconHit();
    
    void SetGeomID(COMET::IGeometryId id);

    ClassDef(IWritableReconHit,5);
};
#endif