Teko_BlockLowerTriInverseOp.hpp

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//      Teko: A package for block and physics based preconditioning
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#ifndef __Teko_BlockLowerTriInverseOp_hpp__
#define __Teko_BlockLowerTriInverseOp_hpp__

#include "Teko_Utilities.hpp"
#include "Teko_BlockImplicitLinearOp.hpp"

namespace Teko {

class BlockLowerTriInverseOp : public BlockImplicitLinearOp {
public:
   BlockLowerTriInverseOp(BlockedLinearOp & L,const std::vector<LinearOp> & invDiag);



   virtual VectorSpace range() const { return productRange_; }

   virtual VectorSpace domain() const { return productDomain_; }

   virtual void implicitApply(const BlockedMultiVector & x, BlockedMultiVector & y,
              const double alpha = 1.0, const double beta = 0.0) const;

   virtual void describe(Teuchos::FancyOStream &out_arg,
                         const Teuchos::EVerbosityLevel verbLevel) const;

protected:
   // fundamental operators to use
   const BlockedLinearOp L_;  
   std::vector<LinearOp> invDiag_; 

   Teuchos::RCP<const Thyra::ProductVectorSpaceBase<double> > productRange_; 
   Teuchos::RCP<const Thyra::ProductVectorSpaceBase<double> > productDomain_; 

   // scratch space...so we don't have to reallocate
   mutable BlockedMultiVector srcScrap_;
   mutable BlockedMultiVector dstScrap_;

private:
   // hide me!
   BlockLowerTriInverseOp();
   BlockLowerTriInverseOp(const BlockLowerTriInverseOp &);
};

inline LinearOp createBlockLowerTriInverseOp(BlockedLinearOp & U,const std::vector<LinearOp> & invDiag)
{
   return Teuchos::rcp(new BlockLowerTriInverseOp(U,invDiag));
}

inline LinearOp createBlockLowerTriInverseOp(BlockedLinearOp & L,const std::vector<LinearOp> & invDiag,const std::string & str)
{
   Teuchos::RCP<Thyra::LinearOpBase<double> > result = Teuchos::rcp(new BlockLowerTriInverseOp(L,invDiag));
   result->setObjectLabel(str);

   return result;
}

} // end namespace Teko

#endif