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// ***********************************************************************
//
// Thyra: Interfaces and Support for Abstract Numerical Algorithms
// Copyright (2004) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
// @HEADER
#ifndef THYRA_BLOCKED_LINEAR_OP_BASE_HPP
#define THYRA_BLOCKED_LINEAR_OP_BASE_HPP
#include "Thyra_LinearOpBase.hpp"
namespace Thyra {
/** \brief . */
template <class Scalar> class ProductVectorSpaceBase;
/** \brief Base interface for linear operators that can be accessed as
* sub-blocks.
*
* ToDo: Finish Documentation.
*
* \ingroup Thyra_Op_Vec_extended_interfaces_code_grp
*/
template<class Scalar>
class BlockedLinearOpBase
: virtual public LinearOpBase<Scalar>
{
public:
/** \brief Return the product space for the range.
*
* A return value of <tt>return.get()==NULL</tt> is an indication that
* <tt>*this</tt> is not fully initialized.
*/
virtual Teuchos::RCP<const ProductVectorSpaceBase<Scalar> >
productRange() const = 0;
/** \brief Return the product space for the domain.
*
* A return value of <tt>return.get()==NULL</tt> is an indication that
* <tt>*this</tt> is not fully initialized.
*/
virtual Teuchos::RCP<const ProductVectorSpaceBase<Scalar> >
productDomain() const = 0;
/** \brief Return if the block <tt>(i,j)</tt> exists or not.
*
* \param i [in] Zero-based index for the block row.
* \param j [in] Zero-based index for the block column.
*
* <b>Preconditions:</b><ul>
* <li><tt>0 <= i && i < this->productRange()->numBlocks()</tt>
* <li><tt>0 <= j && j < this->productDomain()->numBlocks()</tt>
* </ul>
*/
virtual bool blockExists(const int i, const int j) const = 0;
/** \brief Return if the block <tt>(i,j)</tt> is const only or not.
*
* \param i [in] Zero-based index for the block row.
* \param j [in] Zero-based index for the block column.
*
* <b>Preconditions:</b><ul>
* <li><tt>0 <= i && i < this->productRange()->numBlocks()</tt>
* <li><tt>0 <= j && j < this->productDomain()->numBlocks()</tt>
* </ul>
*/
virtual bool blockIsConst(const int i, const int j) const = 0;
/** \brief Return a non-const view of the block <tt>(i,j)</tt> if it exists.
*
* \param i [in] Zero-based index for the block row.
* \param j [in] Zero-based index for the block column.
*
* <b>Preconditions:</b><ul>
* <li><tt>this->blockIsConst(i,j)==false</tt>
* <li><tt>0 <= i && i < this->productRange()->numBlocks()</tt>
* <li><tt>0 <= j && j < this->productDomain()->numBlocks()</tt>
* </ul>
*
* <b>Postconditions:</b><ul>
* <li>[<tt>this->blockExists(i,j)==true</tt>] <tt>return.get()!=NULL</tt>
* <li>[<tt>this->blockExists(i,j)==false</tt>] <tt>return.get()==NULL</tt>
* </ul>
*/
virtual Teuchos::RCP<LinearOpBase<Scalar> >
getNonconstBlock(const int i, const int j) = 0;
/** \brief Return a const view of the block <tt>(i,j)</tt> if it exists.
*
* \param i [in] Zero-based index for the block row.
* \param j [in] Zero-based index for the block column.
*
* <b>Preconditions:</b><ul>
* <li><tt>0 <= i && i < this->productRange()->numBlocks()</tt>
* <li><tt>0 <= j && j < this->productDomain()->numBlocks()</tt>
* </ul>
*
* <b>Postconditions:</b><ul>
* <li>[<tt>this->blockExists(i,j)==true</tt>] <tt>return.get()!=NULL</tt>
* <li>[<tt>this->blockExists(i,j)==false</tt>] <tt>return.get()==NULL</tt>
* </ul>
*/
virtual Teuchos::RCP<const LinearOpBase<Scalar> >
getBlock(const int i, const int j) const = 0;
};
} // namespace Thyra
#endif // THYRA_BLOCKED_LINEAR_OP_BASE_HPP
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