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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: IpZeroMatrix.hpp 735 2006-06-04 06:10:05Z andreasw $
//
// Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13

#ifndef __IPZEROMATRIX_HPP__
#define __IPZEROMATRIX_HPP__

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

namespace Ipopt
{

  class ZeroMatrix : public Matrix
  {
  public:


    ZeroMatrix(const MatrixSpace* owner_space);

    ~ZeroMatrix();

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

  private:
    ZeroMatrix();

    ZeroMatrix(const ZeroMatrix&);

    void operator=(const ZeroMatrix&);
  };

  class ZeroMatrixSpace : public MatrixSpace
  {
  public:
    ZeroMatrixSpace(Index nrows, Index ncols)
        :
        MatrixSpace(nrows, ncols)
    {}

    virtual ~ZeroMatrixSpace()
    {}

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

    ZeroMatrix* MakeNewZeroMatrix() const
    {
      return new ZeroMatrix(this);
    }
  private:
    ZeroMatrixSpace();

    ZeroMatrixSpace(const ZeroMatrixSpace&);

    void operator=(const ZeroMatrixSpace&);
  };
} // namespace Ipopt
#endif

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