//                                               -*- C++ -*-
/**
 *  @file  NumericalMathHessianImplementation.hxx
 *  @brief Abstract top-level class for all numerical math hessian implementations
 *
 *  (C) Copyright 2005-2012 EDF-EADS-Phimeca
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License.
 *
 *  This library is distributed in the hope that it will be useful
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 *  @author schueller
 *  @date   2012-02-17 19:35:43 +0100 (Fri, 17 Feb 2012)
 *  Id      NumericalMathHessianImplementation.hxx 2392 2012-02-17 18:35:43Z schueller
 */
#ifndef OPENTURNS_NUMERICALMATHHESSIANIMPLEMENTATION_HXX
#define OPENTURNS_NUMERICALMATHHESSIANIMPLEMENTATION_HXX

#include "PersistentObject.hxx"
#include "NumericalPoint.hxx"
#include "Description.hxx"
#include "Indices.hxx"
#include "SymmetricTensor.hxx"
#include "Pointer.hxx"
#include "StorageManager.hxx"

BEGIN_NAMESPACE_OPENTURNS




/**
 * @class NumericalMathHessianImplementation
 *
 * This class offers an abstract interface for the implementation
 * of an real numerical mathematical hessian into the platform.
 */
class NumericalMathHessianImplementation
  : public PersistentObject
{
  CLASSNAME;
public:

  typedef Pointer<NumericalMathHessianImplementation> Implementation;


  /** Default constructor */
  NumericalMathHessianImplementation();

  /** Virtual constructor */
  virtual NumericalMathHessianImplementation * clone() const;

  /** Comparison operator */
  Bool operator ==(const NumericalMathHessianImplementation & other) const;

  /** String converter */
  virtual String __repr__() const;
  virtual String __str__(const String & offset = "") const;


  /** Description Accessor */
  void setDescription(const Description & description);
  Description getDescription() const;

  /** Test for actual implementation */
  virtual Bool isActualImplementation() const;

  /** Get the i-th marginal evaluation */
  virtual Implementation getMarginal(const UnsignedLong i) const;

  /** Get the evaluation corresponding to indices components */
  virtual Implementation getMarginal(const Indices & indices) const;



  /* Here is the interface that all derived class must implement */

  /** Hessian method */
  virtual SymmetricTensor hessian(const NumericalPoint & inP) const;

  /** Accessor for input point dimension */
  virtual UnsignedLong getInputDimension() const;

  /** Accessor for output point dimension */
  virtual UnsignedLong getOutputDimension() const;

  /** Get the number of calls to operator() */
  UnsignedLong getCallsNumber() const;

  /** Method save() stores the object through the StorageManager */
  void save(Advocate & adv) const;

  /** Method load() reloads the object from the StorageManager */
  void load(Advocate & adv);

protected:

  /** Number of calls since the construction */
  mutable UnsignedLong callsNumber_;

private:

  /** The description of all components */
  Description description_;


}; /* class NumericalMathHessianImplementation */


END_NAMESPACE_OPENTURNS

#endif /* OPENTURNS_NUMERICALMATHHESSIANIMPLEMENTATION_HXX */
