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//
// INCL++ intra-nuclear cascade model
// Pekka Kaitaniemi, CEA and Helsinki Institute of Physics
// Davide Mancusi, CEA
// Alain Boudard, CEA
// Sylvie Leray, CEA
// Joseph Cugnon, University of Liege
//
// INCL++ revision: v5.0_rc3
//
#define INCLXX_IN_GEANT4_MODE 1

#include "globals.hh"

#ifndef G4INCLCluster_hh
#define G4INCLCluster_hh 1

#include "G4INCLParticle.hh"

namespace G4INCL {

  /**
   * Cluster is a particle (inherits from the Particle class) that is
   * actually a collection of elementary particles.
   */
  class Cluster : public Particle {
  public:

    /**
     * We can build dummy clusters based on Z and A and set their properties
     * later using standard setters (setEnergy, setPosition...).
     */
    Cluster(const G4int Z, const G4int A) : Particle()
    {
      setType(Composite);
      theZ = Z;
      theA = A;
      setMass(ParticleTable::getMass(theA,theZ));
      setNumberOfCollisions(1);
      makeParticipant();
    };

    /**
     * We can also build cluster starting from a single "leading"
     * particle and then incrementally add more paricles to it using
     * addParticle().
     */
    Cluster(Particle* p) : Particle()
    {
      setType(Composite);
      addParticle(p);
      setMass(ParticleTable::getMass(theA,theZ));
      adjustMomentumFromEnergy();
      setNumberOfCollisions(1);
      makeParticipant();
    };

    /**
     * A cluster can be directly built from a list of particles.
     */
    Cluster(ParticleList *pl) : Particle()
    {
      setType(Composite);
      for(ParticleIter i = pl->begin(); i != pl->end(); ++i) {
	addParticle((*i));
      }
      thePosition /= theA;
      setMass(ParticleTable::getMass(theA,theZ));
      adjustMomentumFromEnergy();
      setNumberOfCollisions(1);
      makeParticipant();
    };

    /**
     * A cluster can be directly built from a list of particles.
     */
    Cluster(const ParticleList &pl) : Particle()
    {
      setType(Composite);
      for(ParticleIter i = pl.begin(); i != pl.end(); ++i) {
	addParticle((*i));
      }
      thePosition /= theA;
      setMass(ParticleTable::getMass(theA,theZ));
      adjustMomentumFromEnergy();
      setNumberOfCollisions(1);
      makeParticipant();
    };

    virtual ~Cluster() {};

    /// \brief Set the charge number of the cluster
    void setZ(const G4int Z) { theZ = Z; }

    /// \brief Set the mass number of the cluster
    void setA(const G4int A) { theA = A; }

    /**
     * Get the list of particles in the cluster.
     */
    ParticleList const *getParticles() const { return &particles; }

    /**
     * Add one particle to the cluster. This updates the cluster mass,
     * energy, size, etc.
     */
    void addParticle(Particle * const p) {
      particles.push_back(p);
      theEnergy += p->getEnergy();
      thePotentialEnergy += p->getPotentialEnergy();
      theMomentum += p->getMomentum();
      thePosition += p->getPosition();
      theA += p->getA();
      theZ += p->getZ();
    };

    /// \brief Returns the list of particles that make up the cluster
    ParticleList getParticleList() const { return particles; }

    std::string prG4int() const {
      std::stringstream ss;
      ss << "Cluster (ID = " << ID << ") type = ";
      ss << ParticleTable::getName(theType);
      ss << std::endl
        << "   energy = " << theEnergy << std::endl
        << "   momentum = "
        << theMomentum.prG4int()
        << std::endl
        << "   position = "
        << thePosition.prG4int()
        << std::endl
        << "Contains the following particles:"
        << std::endl;
      for(ParticleIter i=particles.begin(); i!=particles.end(); ++i)
        ss << (*i)->prG4int();
      return ss.str();
    }

  private:
    ParticleList particles;
  };

}

#endif