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/*
// @HEADER
// 
// ***********************************************************************
// 
//      Teko: A package for block and physics based preconditioning
//                  Copyright 2010 Sandia Corporation 
//  
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//  
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//  
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//  
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//  
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission. 
//  
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//  
// Questions? Contact Eric C. Cyr (eccyr@sandia.gov)
// 
// ***********************************************************************
// 
// @HEADER

*/

#ifndef __Teko_InterlacedEpetra_hpp__
#define __Teko_InterlacedEpetra_hpp__

// Teuchos includes
#include "Teuchos_RCP.hpp"

// include basic Epetra information
#ifdef HAVE_MPI
   #include "Epetra_MpiComm.h"
#else
   #include "Epetra_SerialComm.h"
#endif
#include "Epetra_Map.h"
#include "Epetra_CrsMatrix.h"
#include "Epetra_MultiVector.h"
#include "Epetra_Vector.h"
#include "Epetra_Export.h"
#include "Epetra_Import.h"

#include <vector>

namespace Teko {
namespace Epetra {
namespace Strided {

/** Build maps to make other conversions. This functions build maps assuming
  * that there are number of variables and you want to break them all up
  * into single blocks.
  *
  * \param[in] numGlobals The number of global unknowns in the original map
  * \param[in] numVars The number of sub maps to build
  * \param[in] comm Communicator to use in construction of the maps
  * \param[in,out] subMaps The maps for each block of unknowns. This vector
  *                        will be of length <code>numVars</code>. The integer
  *                        in the pair is the number of local variables being
  *                        represented. For this function it will always be 1.
  *                        The map itself will contain the global indices from
  *                        the original problem. This is useful for Export/Import
  *                        operations. The RCP for the map contains another map
  *                        associated with the string "contigMap" based on a
  *                        contiguous unknown numbering.
  *
  * \note <code> numGlobals % numVars == 0 </code>
  */
void buildSubMaps(int numGlobals,int numVars,const Epetra_Comm & comm,
                  std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > & subMaps);

/** Build maps to make other conversions. This functions build maps assuming
  * that there are number of variables and you want to break them all up
  * into blocks with sizes (in the number of varaibles) specified in <code>vars</code>
  *
  * \param[in] numGlobals The number of global unknowns in the original map
  * \param[in] vars Breakdown of each varaible to build.
  * \param[in] comm Communicator to use in construction of the maps
  * \param[in,out] subMaps The maps for each block of unknowns. This vector
  *                        will be of length <code>vars.size()</code>. The integer
  *                        in the pair is the number of local variables being
  *                        represented (this will be from <code>vars</code>). 
  *                        The map itself will contain the global indices from
  *                        the original problem. This is useful for Export/Import
  *                        operations. The RCP for the map contains another map
  *                        associated with the string "contigMap" based on a
  *                        contiguous unknown numbering.
  *
  * \note <code> numGlobals % sum(vars) == 0 </code>
  */
void buildSubMaps(int numGlobals,const std::vector<int> & vars,const Epetra_Comm & comm,
                  std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > & subMaps);

/** Build maps to make other conversions. This functions build maps assuming
  * that there are number of variables and you want to break them all up
  * into blocks with sizes (in the number of varaibles) specified in <code>vars</code>
  *
  * \param[in] numGlobals The number of global unknowns in the original map
  * \param[in] numMyElements Number of nodes in this processor.
  * \param[in] minMyGID Minimum global ID on this processor.
  * \param[in] vars Breakdown of each varaible to build.
  * \param[in] comm Communicator to use in construction of the maps
  * \param[in,out] subMaps The maps for each block of unknowns. This vector
  *                        will be of length <code>vars.size()</code>. The integer
  *                        in the pair is the number of local variables being
  *                        represented (this will be from <code>vars</code>). 
  *                        The map itself will contain the global indices from
  *                        the original problem. This is useful for Export/Import
  *                        operations. The RCP for the map contains another map
  *                        associated with the string "contigMap" based on a
  *                        contiguous unknown numbering.
  *
  * \note <code> numGlobals % sum(vars) == 0 </code>
  */
void buildSubMaps(int numGlobals,int numMyElements,int minMyGID,const std::vector<int> & vars,const Epetra_Comm & comm,
                  std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > & subMaps);

/** Build maps to make other conversions. This functions build maps assuming
  * that there are number of variables and you want to break them all up
  * into blocks with sizes (in the number of varaibles) specified in <code>vars</code>
  *
  * \param[in] globalMap Parent map that describes the parallel layout of the new
  *                      sub maps.
  * \param[in] vars Breakdown of each varaible to build.
  * \param[in] comm Communicator to use in construction of the maps
  * \param[in,out] subMaps The maps for each block of unknowns. This vector
  *                        will be of length <code>vars.size()</code>. The integer
  *                        in the pair is the number of local variables being
  *                        represented (this will be from <code>vars</code>). 
  *                        The map itself will contain the global indices from
  *                        the original problem. This is useful for Export/Import
  *                        operations. The RCP for the map contains another map
  *                        associated with the string "contigMap" based on a
  *                        contiguous unknown numbering.
  *
  * \note <code> numGlobals % sum(vars) == 0 </code>
  */
void buildSubMaps(const Epetra_Map & globalMap,const std::vector<int> & vars,const Epetra_Comm & comm,
                  std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > & subMaps);

// build conversion import and export operators
void buildExportImport(const Epetra_Map & baseMap, 
                       const std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > & subMaps,
                       std::vector<Teuchos::RCP<Epetra_Export> > & subExport,
                       std::vector<Teuchos::RCP<Epetra_Import> > & subImport);

// build a vector of subVectors
void buildSubVectors(const std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > & subMaps,
                     std::vector<Teuchos::RCP<Epetra_MultiVector> > & subVectors,int count);

/** Associate a set of multi-vectors with a set of sub maps (this modifies the "extra data"
  * of the subVectors to contain info about the maps.
  */
void associateSubVectors(const std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > & subMaps,
                         std::vector<Teuchos::RCP<const Epetra_MultiVector> > & subVectors);

// build a single subblock Epetra_CrsMatrix
Teuchos::RCP<Epetra_CrsMatrix> buildSubBlock(int i,int j,const Epetra_CrsMatrix & A,
                                             const std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > & subMaps);

// Rebuild a single subblock of a matrix
void rebuildSubBlock(int i,int j,const Epetra_CrsMatrix & A,
                     const std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > & subMaps,Epetra_CrsMatrix & mat);

// copy contents of many subvectors to a single vector
void many2one(Epetra_MultiVector & one, const std::vector<Teuchos::RCP<const Epetra_MultiVector> > & many,
              const std::vector<Teuchos::RCP<Epetra_Export> > & subExport);

// copy contents of a single vector to many subvectors
void one2many(std::vector<Teuchos::RCP<Epetra_MultiVector> > & many,const Epetra_MultiVector & single,
              const std::vector<Teuchos::RCP<Epetra_Import> > & subImport);

}
} // end namespace Epetra
} // end namespace Teko

#endif