lcm_sts_min_norm2_recursive.h

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// -*- C++ -*-
 
/*! @file
 * @brief Intgrator for exp(S dt)
 *
 * A component integrator to integrate exp(Sdt) for some 
 * monomial list S (ie this is a leapP like component)
 */
 
#ifndef LCM_MIN_NORM2_RECURSIVE_H
#define LCM_MIN_NORM2_RECURSIVE_H
 
 
#include "chromabase.h"
#include "update/molecdyn/hamiltonian/abs_hamiltonian.h"
#include "update/molecdyn/integrator/abs_integrator.h"
#include "update/molecdyn/integrator/integrator_shared.h"
 
namespace Chroma 
{
 
  /*! @ingroup integrator */
  namespace LatColMatSTSMinNorm2RecursiveIntegratorEnv 
  {
    extern const std::string name;
    bool registerAll();
  }
 
 
  /*! @ingroup integrator */
  struct  LatColMatSTSMinNorm2RecursiveIntegratorParams
  {
    LatColMatSTSMinNorm2RecursiveIntegratorParams();
    LatColMatSTSMinNorm2RecursiveIntegratorParams(XMLReader& xml, const std::string& path);
    int  n_steps;
    Real lambda;
    multi1d<std::string> monomial_ids;
    std::string subintegrator_xml;
  };
 
  /*! @ingroup integrator */
  void read(XMLReader& xml_in, 
            const std::string& path,
            LatColMatSTSMinNorm2RecursiveIntegratorParams& p);
 
  /*! @ingroup integrator */
  void write(XMLWriter& xml_out,
             const std::string& path, 
             const LatColMatSTSMinNorm2RecursiveIntegratorParams& p);
 
  //! MD integrator interface for PQP leapfrog
  /*! @ingroup integrator
   *  Specialised to multi1d<LatticeColorMatrix>
   */
  class LatColMatSTSMinNorm2RecursiveIntegrator 
    : public AbsRecursiveIntegrator<multi1d<LatticeColorMatrix>,
                                    multi1d<LatticeColorMatrix> > 
  {
  public:
 
    // Simplest Constructor
    LatColMatSTSMinNorm2RecursiveIntegrator(int  n_steps_, 
                                         const multi1d<std::string>& monomial_ids_,
                                         Real lambda_, 
 
                                         Handle< AbsComponentIntegrator< multi1d<LatticeColorMatrix>, multi1d<LatticeColorMatrix> > >& SubIntegrator_) : n_steps(n_steps_), lambda(lambda_), SubIntegrator(SubIntegrator_) {
 
      IntegratorShared::bindMonomials(monomial_ids_, monomials);
    };
 
    // Construct from params struct and Hamiltonian
    LatColMatSTSMinNorm2RecursiveIntegrator(
                                         const LatColMatSTSMinNorm2RecursiveIntegratorParams& p) : n_steps(p.n_steps), lambda(p.lambda), SubIntegrator(IntegratorShared::createSubIntegrator(p.subintegrator_xml)) {
 
      IntegratorShared::bindMonomials(p.monomial_ids, monomials);
      
    }
 
 
    // Copy constructor
    LatColMatSTSMinNorm2RecursiveIntegrator(const LatColMatSTSMinNorm2RecursiveIntegrator& l) :
      n_steps(l.n_steps), monomials(l.monomials), lambda(l.lambda), SubIntegrator(l.SubIntegrator) {}
 
    // ! Destruction is automagic
    ~LatColMatSTSMinNorm2RecursiveIntegrator(void) {};
 
 
    void operator()( AbsFieldState<multi1d<LatticeColorMatrix>,
                                   multi1d<LatticeColorMatrix> >& s, 
                     const Real& traj_length) const;
                            
    AbsComponentIntegrator<multi1d<LatticeColorMatrix>,
                           multi1d<LatticeColorMatrix> >& getSubIntegrator() const {
      return (*SubIntegrator);
    }
    
  protected:
    //! Refresh fields in just this level
    void refreshFieldsThisLevel(AbsFieldState<multi1d<LatticeColorMatrix>,
                                multi1d<LatticeColorMatrix> >& s) const {
      for(int i=0; i < monomials.size(); i++) { 
        monomials[i].mon->refreshInternalFields(s);
      }
    }
 
    //! Reset Predictors in just this level
    void resetPredictorsThisLevel(void) const {
      for(int i=0; i < monomials.size(); ++i) {
        monomials[i].mon->resetPredictors();
      }
    }
 
  private:
    
    int  n_steps;
    Real lambda;
 
    multi1d< IntegratorShared::MonomialPair > monomials;
 
    Handle< AbsComponentIntegrator<multi1d<LatticeColorMatrix>,
                                   multi1d<LatticeColorMatrix> > > SubIntegrator;
                      
 
  };
 
}
 
 
#endif