///////////////////////////////////////////////////////////////////////////////
//
// File PreconditionerLinearWithDiag.h
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// License for the specific language governing rights and limitations under
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// DEALINGS IN THE SOFTWARE.
//
// Description: Preconditioner header for diagonal with linear sub space
//
///////////////////////////////////////////////////////////////////////////////
#ifndef NEKTAR_LIB_MULTIREGIONS_PRECONDITIONERLINEARWITHDIAG_H
#define NEKTAR_LIB_MULTIREGIONS_PRECONDITIONERLINEARWITHDIAG_H

#include <MultiRegions/GlobalLinSys.h>
#include <MultiRegions/Preconditioner.h>
#include <MultiRegions/PreconditionerLinear.h>
#include <MultiRegions/MultiRegionsDeclspec.h>
#include <MultiRegions/AssemblyMap/AssemblyMapCG.h>

namespace Nektar
{
    namespace MultiRegions
    {
        class PreconditionerLinearWithDiag;
        typedef boost::shared_ptr<PreconditionerLinearWithDiag>  PreconditionerLinearWithDiagSharedPtr;

        class PreconditionerLinearWithDiag: public Preconditioner
	{
        public:
            /// Creates an instance of this class
            static PreconditionerSharedPtr create(
                        const boost::shared_ptr<GlobalLinSys> &plinsys,
                        const boost::shared_ptr<AssemblyMap>
                        &pLocToGloMap)
            {
	        PreconditionerSharedPtr p = MemoryManager<PreconditionerLinearWithDiag>::AllocateSharedPtr(plinsys,pLocToGloMap);
	        p->InitObject();
	        return p;
            }

            /// Name of class
            static std::string className;

            MULTI_REGIONS_EXPORT PreconditionerLinearWithDiag(
                         const boost::shared_ptr<GlobalLinSys> &plinsys,
	                 const AssemblyMapSharedPtr &pLocToGloMap);

            MULTI_REGIONS_EXPORT
            virtual ~PreconditionerLinearWithDiag() {}

	protected:
            //const boost::weak_ptr<GlobalLinSys>         m_linsys;

            PreconditionerSharedPtr m_linSpacePrecon;
            PreconditionerSharedPtr m_diagonalPrecon;

	private:

            virtual void v_InitObject();

            virtual void v_DoPreconditioner(                
                      const Array<OneD, NekDouble>& pInput,
		      Array<OneD, NekDouble>& pOutput);

            virtual void v_BuildPreconditioner();

        };
    }
}

#endif
