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 // -*- C++ -*-
 //
 // NJetsAmplitude.h is a part of Herwig - A multi-purpose Monte Carlo event generator
 // Copyright (C) 2002-2019 The Herwig Collaboration
 //
 // Herwig is licenced under version 3 of the GPL, see COPYING for details.
 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
 //
 #ifndef Herwig_NJetsAmplitude_H
 #define Herwig_NJetsAmplitude_H
 //
 // This is the declaration of the NJetsAmplitude class.
 //
 
 #include "Herwig/MatrixElement/Matchbox/Base/MatchboxOLPME.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * \ingroup Matchbox
  * \author Simon Platzer
  *
  * \brief NJetsAmplitude implements an interface to NJets
  */
 class NJetsAmplitude: public MatchboxOLPME {
 
 public:
 
   /**
    * The default constructor.
    */
   NJetsAmplitude();
 
 public:
 
   /**
    * Return true, if this amplitude already includes averaging over
    * incoming parton's quantum numbers.
    */
   virtual bool hasInitialAverage() const { return false; }
 
   /**
    * Return true, if this amplitude already includes symmetry factors
    * for identical outgoing particles.
    */
   virtual bool hasFinalStateSymmetry() const { return false; }
 
   /**
    * Start the one loop provider, if appropriate, giving order and
    * contract files
    */
   virtual void signOLP(const string&, const string&);
 
   /**
    * Start the one loop provider, if appropriate
    */
   virtual void startOLP(const string&, int& status);
 
   /**
    * Start the one loop provider, if appropriate. This default
    * implementation writes an BLHA 2.0 order file and starts the OLP
    */
   virtual bool startOLP(const map<pair<Process,int>,int>& procs);
 
   /**
    * Call OLP_EvalSubProcess and fill in the results
    */
   virtual void evalSubProcess() const;
 
   /**
    * Fill in results for the given colour correlator
    */
   virtual void evalColourCorrelator(pair<int,int> ij) const;
 
   /**
    * Return a positive helicity polarization vector for a gluon of
    * momentum p (with reference vector n) to be used when evaluating
    * spin correlations.
    */
   virtual LorentzVector<Complex> plusPolarization(const Lorentz5Momentum& p,
                           const Lorentz5Momentum& n,
                           int id = -1) const;
 
   /**
    * Fill in results for the given colour/spin correlator
    */
   virtual void evalSpinColourCorrelator(pair<int,int> ij) const;
 
 public:
 
   /** @name Functions used by the persistent I/O system. */
   //@{
   /**
    * Function used to write out object persistently.
    * @param os the persistent output stream written to.
    */
   void persistentOutput(PersistentOStream & os) const;
 
   /**
    * Function used to read in object persistently.
    * @param is the persistent input stream read from.
    * @param version the version number of the object when written.
    */
   void persistentInput(PersistentIStream & is, int version);
   //@}
 
   /**
    * The standard Init function used to initialize the interfaces.
    * Called exactly once for each class by the class description system
    * before the main function starts or
    * when this class is dynamically loaded.
    */
   static void Init();
 
 protected:
 
   /** @name Standard Interfaced functions. */
   //@{
 
   /**
    * Initialize this object after the setup phase before saving an
    * EventGenerator to disk.
    * @throws InitException if object could not be initialized properly.
    */
   virtual void doinit();
 
   /**
    * Initialize this object. Called in the run phase just before
    * a run begins.
    */
   virtual void doinitrun();
   //@}
 
 protected:
 
   /** @name Clone Methods. */
   //@{
   /**
    * Make a simple clone of this object.
    * @return a pointer to the new object.
    */
   virtual IBPtr clone() const;
 
   /** Make a clone of this object, possibly modifying the cloned object
    * to make it sane.
    * @return a pointer to the new object.
    */
   virtual IBPtr fullclone() const;
   //@}
 
 
 // If needed, insert declarations of virtual function defined in the
 // InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).
 
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   NJetsAmplitude & operator=(const NJetsAmplitude &) = delete;
 
   /**
    * Store colour correlator results
    */
   mutable vector<double> colourCorrelatorResults;
 
   /**
    * Store spin colour correlator results
    */
   mutable vector<double> spinColourCorrelatorResults;
 
   /**
    *  Location of NJETs
    */
   string NJetsPrefix_;
 
   /**
    *  Location of NJET librarys
    */
   string NJetsLibs_;
 
   /**
    * Load the NJET library
    */
   void loadNJET();
 
 };
 
 }
 
 #endif /* Herwig_NJetsAmplitude_H */

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