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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: IpSymScaledMatrix.hpp 1001 2007-06-18 20:36:53Z andreasw $
//
// Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13

#ifndef __IPSYMSCALEDMATRIX_HPP__
#define __IPSYMSCALEDMATRIX_HPP__

#include "IpUtils.hpp"
#include "IpSymMatrix.hpp"

namespace Ipopt
{

  /* forward declarations */
  class SymScaledMatrixSpace;

  class SymScaledMatrix : public SymMatrix
  {
  public:


    SymScaledMatrix(const SymScaledMatrixSpace* owner_space);

    ~SymScaledMatrix();

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

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

    SmartPtr<const SymMatrix> GetUnscaledMatrix() const;

    SmartPtr<SymMatrix> GetUnscaledMatrixNonConst();

    SmartPtr<const Vector> RowColScaling() const;

  protected:
    virtual void MultVectorImpl(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;

  private:
    SymScaledMatrix();

    SymScaledMatrix(const SymScaledMatrix&);

    void operator=(const SymScaledMatrix&);

    SmartPtr<const SymMatrix> matrix_;
    SmartPtr<SymMatrix> nonconst_matrix_;

    SmartPtr<const SymScaledMatrixSpace> owner_space_;
  };

  class SymScaledMatrixSpace : public SymMatrixSpace
  {
  public:
    SymScaledMatrixSpace(const SmartPtr<const Vector>& row_col_scaling,
                         bool row_col_scaling_reciprocal,
                         const SmartPtr<const SymMatrixSpace>& unscaled_matrix_space)
        :
        SymMatrixSpace(unscaled_matrix_space->Dim()),
        unscaled_matrix_space_(unscaled_matrix_space)
    {
      scaling_ = row_col_scaling->MakeNewCopy();
      if (row_col_scaling_reciprocal) {
        scaling_->ElementWiseReciprocal();
      }
    }

    ~SymScaledMatrixSpace()
    {}

    SymScaledMatrix* MakeNewSymScaledMatrix(bool allocate_unscaled_matrix = false) const
    {
      SymScaledMatrix* ret = new SymScaledMatrix(this);
      if (allocate_unscaled_matrix) {
        SmartPtr<SymMatrix> unscaled_matrix = unscaled_matrix_space_->MakeNewSymMatrix();
        ret->SetUnscaledMatrixNonConst(unscaled_matrix);
      }
      return ret;
    }

    virtual SymMatrix* MakeNewSymMatrix() const
    {
      return MakeNewSymScaledMatrix();
    }
    virtual Matrix* MakeNew() const
    {
      return MakeNewSymScaledMatrix();
    }

    SmartPtr<const Vector> RowColScaling() const
    {
      return ConstPtr(scaling_);
    }

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

  private:
    SymScaledMatrixSpace();

    SymScaledMatrixSpace(const SymScaledMatrixSpace&);

    SymScaledMatrixSpace& operator=(const SymScaledMatrixSpace&);

    SmartPtr<Vector> scaling_;
    SmartPtr<const SymMatrixSpace> unscaled_matrix_space_;
  };

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

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

  inline
  SmartPtr<const SymMatrix> SymScaledMatrix::GetUnscaledMatrix() const
  {
    return matrix_;
  }

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

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

} // namespace Ipopt

#endif

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