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// Copyright (C) 2004, 2007 International Business Machines and others.
// All Rights Reserved.
// This code is published under the Common Public License.
//
// $Id: IpScaledMatrix.hpp 1001 2007-06-18 20:36:53Z andreasw $
//
// Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13

#ifndef __IPSCALEDMATRIX_HPP__
#define __IPSCALEDMATRIX_HPP__

#include "IpUtils.hpp"
#include "IpMatrix.hpp"

namespace Ipopt
{

  /* forward declarations */
  class ScaledMatrixSpace;

  class ScaledMatrix : public Matrix
  {
  public:


    ScaledMatrix(const ScaledMatrixSpace* owner_space);

    ~ScaledMatrix();

    void SetUnscaledMatrix(const SmartPtr<const Matrix> unscaled_matrix);

    void SetUnscaledMatrixNonConst(const SmartPtr<Matrix>& unscaled_matrix);

    SmartPtr<const Matrix> GetUnscaledMatrix() const;

    SmartPtr<Matrix> GetUnscaledMatrixNonConst();

    SmartPtr<const Vector> RowScaling() const;

    SmartPtr<const Vector> ColumnScaling() const;

  protected:
    virtual void MultVectorImpl(Number alpha, const Vector& x,
                                Number beta, Vector& y) const;

    virtual void TransMultVectorImpl(Number alpha, const Vector& x,
                                     Number beta, Vector& y) const;

    virtual bool HasValidNumbersImpl() const;

    virtual void PrintImpl(const Journalist& jnlst,
                           EJournalLevel level,
                           EJournalCategory category,
                           const std::string& name,
                           Index indent,
                           const std::string& prefix) const;

    virtual void AddMSinvZImpl(Number alpha, const Vector& S, const Vector& Z,
                               Vector& X) const;

    virtual void SinvBlrmZMTdBrImpl(Number alpha, const Vector& S,
                                    const Vector& R, const Vector& Z,
                                    const Vector& D, Vector& X) const;

  private:
    ScaledMatrix();

    ScaledMatrix(const ScaledMatrix&);

    void operator=(const ScaledMatrix&);

    SmartPtr<const Matrix> matrix_;
    SmartPtr<Matrix> nonconst_matrix_;

    SmartPtr<const ScaledMatrixSpace> owner_space_;
  };

  class ScaledMatrixSpace : public MatrixSpace
  {
  public:
    ScaledMatrixSpace(const SmartPtr<const Vector>& row_scaling,
                      bool row_scaling_reciprocal,
                      const SmartPtr<const MatrixSpace>& unscaled_matrix_space,
                      const SmartPtr<const Vector>& column_scaling,
                      bool column_scaling_reciprocal);

    ~ScaledMatrixSpace()
    {}

    ScaledMatrix* MakeNewScaledMatrix(bool allocate_unscaled_matrix = false) const
    {
      ScaledMatrix* ret = new ScaledMatrix(this);
      if (allocate_unscaled_matrix) {
        SmartPtr<Matrix> unscaled_matrix = unscaled_matrix_space_->MakeNew();
        ret->SetUnscaledMatrixNonConst(unscaled_matrix);
      }
      return ret;
    }

    virtual Matrix* MakeNew() const
    {
      return MakeNewScaledMatrix();
    }

    SmartPtr<const Vector> RowScaling() const
    {
      return ConstPtr(row_scaling_);
    }

    SmartPtr<const MatrixSpace> UnscaledMatrixSpace() const
    {
      return unscaled_matrix_space_;
    }

    SmartPtr<const Vector> ColumnScaling() const
    {
      return ConstPtr(column_scaling_);
    }

  private:
    ScaledMatrixSpace();

    ScaledMatrixSpace(const ScaledMatrixSpace&);

    ScaledMatrixSpace& operator=(const ScaledMatrixSpace&);

    SmartPtr<Vector> row_scaling_;
    SmartPtr<const MatrixSpace> unscaled_matrix_space_;
    SmartPtr<Vector> column_scaling_;
  };

  inline
  void ScaledMatrix::SetUnscaledMatrix(const SmartPtr<const Matrix> unscaled_matrix)
  {
    matrix_ = unscaled_matrix;
    nonconst_matrix_ = NULL;
    ObjectChanged();
  }

  inline
  void ScaledMatrix::SetUnscaledMatrixNonConst(const SmartPtr<Matrix>& unscaled_matrix)
  {
    nonconst_matrix_ = unscaled_matrix;
    matrix_ = GetRawPtr(unscaled_matrix);
    ObjectChanged();
  }

  inline
  SmartPtr<const Matrix> ScaledMatrix::GetUnscaledMatrix() const
  {
    return matrix_;
  }

  inline
  SmartPtr<Matrix> ScaledMatrix::GetUnscaledMatrixNonConst()
  {
    DBG_ASSERT(IsValid(nonconst_matrix_));
    ObjectChanged();
    return nonconst_matrix_;
  }

  inline
  SmartPtr<const Vector> ScaledMatrix::RowScaling() const
  {
    return ConstPtr(owner_space_->RowScaling());
  }

  inline
  SmartPtr<const Vector> ScaledMatrix::ColumnScaling() const
  {
    return ConstPtr(owner_space_->ColumnScaling());
  }

} // namespace Ipopt

#endif

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