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

#ifndef __IPSUMMATRIX_HPP__
#define __IPSUMMATRIX_HPP__

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

namespace Ipopt
{

  /* forward declarations */
  class SumMatrixSpace;

  class SumMatrix : public Matrix
  {
  public:

    SumMatrix(const SumMatrixSpace* owner_space);

    virtual ~SumMatrix();

    void SetTerm(Index iterm, Number factor, const Matrix& matrix);

    void GetTerm(Index iterm, Number& factor, SmartPtr<const Matrix>& matrix) const;

    Index NTerms() 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;

  private:
    SumMatrix();

    SumMatrix(const SumMatrix&);

    void operator=(const SumMatrix&);

    std::vector<Number> factors_;

    std::vector<SmartPtr<const Matrix> > matrices_;

    const SumMatrixSpace* owner_space_;
  };

  class SumMatrixSpace : public MatrixSpace
  {
  public:
    SumMatrixSpace(Index nrows, Index ncols, Index nterms)
        :
        MatrixSpace(nrows, ncols),
        nterms_(nterms)
    {}

    virtual ~SumMatrixSpace()
    {}

    Index NTerms() const
    {
      return nterms_;
    }

    void SetTermSpace(Index term_idx, const MatrixSpace& mat_space);

    SmartPtr<const MatrixSpace> GetTermSpace(Index term_idx) const;

    SumMatrix* MakeNewSumMatrix() const;

    virtual Matrix* MakeNew() const;

  private:
    SumMatrixSpace();

    SumMatrixSpace(const SumMatrixSpace&);

    SumMatrixSpace& operator=(const SumMatrixSpace&);

    const Index nterms_;

    std::vector< SmartPtr<const MatrixSpace> > term_spaces_;
  };

} // namespace Ipopt
#endif

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