PConstraint.h

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// Class PConstraint
//
// Author: Jenny Boehme, Bennmo List
// Last update: $Date: 2005/01/12 10:11:45 $
//          by: $Author: blist $
// 
// Description: constraint 
// a*sum(px)+b*sum(py)+c*sum(pz)+d*sum(E)=e
//               

#ifndef __PCONSTRAINT_H
#define __PCONSTRAINT_H

#include "jbltools/kinfit/ParticleConstraint.h"

class ParticleFitObject;

class PConstraint : public ParticleConstraint {
  public:
    PConstraint (double pxfact_=1, double pyfact_=0, double pzfact_=0,
                 double efact_=0, double value_ = 0);
    virtual ~PConstraint();
    virtual double getValue() const;
    virtual void getDerivatives (int idim, double der[]) const;
    virtual void add1stDerivativesToMatrix(int idim, double *M) const;
    virtual void add2ndDerivativesToMatrix(int idim, double *M, double lambda) const;
    
    virtual void addToGlobalDerMatrix (double lambda, int idim, double *M) const;
    
    virtual void invalidateCache() const;
  
  protected:
    void updateCache() const;
  
  
    double pxfact;
    double pyfact;
    double pzfact;
    double efact;
    double value;
    
    mutable bool cachevalid;
    mutable int  nparams;
};

#endif // __PCONSTRAINT_H

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