#ifndef THitSelection_hxx_seen
#define THitSelection_hxx_seen

#include <iostream>
#include <vector>

#include <TObject.h>
#include <TVector3.h>

#include "EoaCore.hxx"
#include "IDatum.hxx"
#include "IHit.hxx"

namespace COMET {
    class IHitSelection;
    OA_EXCEPTION(EHitSelection,EoaCore);

    /// An invalid hit was added to the hit selection.  This exception can be
    /// caught and continue, with the IHitSelection object intact.
    OA_EXCEPTION(EInvalidHit, EHitSelection);
}

/// A container of THitHandle objects for the hit detector information.  This
/// is an enhanced vector that works well with ROOT.
class COMET::IHitSelection : public IDatum, public std::vector< IHandle<IHit> > {
public:
    IHitSelection(const char* name="hits", 
                  const char* title="Hit Handles");
    virtual ~IHitSelection();

    /// This is the usual std::vector::push_back, but enhanced to make
    /// sure that only valid hits are inserted into the IHitSelection.
    virtual void push_back(const COMET::IHandle<COMET::IHit>& hit);

    /// A convenience method to make sure that a hit is only added to the
    /// IHitSelection once.  The AddHit method is much slower than a
    /// push_back(), so it should only be used when the hit might already be
    /// in the selection.
    virtual void AddHit(const COMET::IHandle<COMET::IHit>&);

    /// A convenience method to make sure that a hit is not in a
    /// IHitSelection.
    virtual void RemoveHit(const COMET::IHandle<COMET::IHit>&);

    /// Print the data vector information.
    virtual void ls(Option_t* opt = "") const;

private:
    ClassDef(IHitSelection,2);
};
#endif