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// Copyright (C) 2004, 2006 International Business Machines and others.
// All Rights Reserved.
// This code is published under the Common Public License.
//
// $Id: IpIdentityMatrix.hpp 735 2006-06-04 06:10:05Z andreasw $
//
// Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13

#ifndef __IPIDENTITYMATRIX_HPP__
#define __IPIDENTITYMATRIX_HPP__

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

namespace Ipopt
{

  class IdentityMatrix : public SymMatrix
  {
  public:


    IdentityMatrix(const SymMatrixSpace* owner_space);

    ~IdentityMatrix();

    void SetFactor(Number factor)
    {
      factor_ = factor;
    }

    Number GetFactor() const
    {
      return factor_;
    }

    Index Dim() const;

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

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

    IdentityMatrix(const IdentityMatrix&);

    void operator=(const IdentityMatrix&);

    Number factor_;
  };

  class IdentityMatrixSpace : public SymMatrixSpace
  {
  public:
    IdentityMatrixSpace(Index dim)
        :
        SymMatrixSpace(dim)
    {}

    virtual ~IdentityMatrixSpace()
    {}

    virtual SymMatrix* MakeNewSymMatrix() const
    {
      return MakeNewIdentityMatrix();
    }

    IdentityMatrix* MakeNewIdentityMatrix() const
    {
      return new IdentityMatrix(this);
    }

  private:
    IdentityMatrixSpace();

    IdentityMatrixSpace(const IdentityMatrixSpace&);

    void operator=(const IdentityMatrixSpace&);
  };

} // namespace Ipopt
#endif

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