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Teko_DiagonalPreconditionerFactory.cpp
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00006 //      Teko: A package for block and physics based preconditioning
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00045 */
00046 
00047 #include "Teko_DiagonalPreconditionerFactory.hpp"
00048 #include "Teko_DiagonalPreconditionerOp.hpp"
00049 #include "Thyra_get_Epetra_Operator.hpp"
00050 #include "Epetra_CrsMatrix.h"
00051 #include "EpetraExt_PointToBlockDiagPermute.h"
00052 
00053 using Teuchos::rcp;
00054 using Teuchos::RCP;
00055 
00056 namespace Teko {
00057 
00058 DiagonalPrecondState::DiagonalPrecondState() {}
00059 
00060 /*****************************************************/
00061 
00062 DiagonalPreconditionerFactory::DiagonalPreconditionerFactory() {}
00063 
00064 RCP<PreconditionerState>  DiagonalPreconditionerFactory::buildPreconditionerState() const
00065 {
00066    return Teuchos::rcp(new DiagonalPrecondState()); 
00067 }
00068 
00069 LinearOp DiagonalPreconditionerFactory::buildPreconditionerOperator(LinearOp & lo,PreconditionerState & state) const
00070 {
00071   if(diagonalType_==BlkDiag) {
00072      // Sanity check the state
00073      DiagonalPrecondState & MyState = Teuchos::dyn_cast<DiagonalPrecondState>(state);
00074    
00075      // Get the underlying Epetra_CrsMatrix, if we have one
00076      Teuchos::RCP<const Epetra_Operator> eo=Thyra::get_Epetra_Operator(*lo);
00077      TEUCHOS_ASSERT(eo!=Teuchos::null);
00078      Teuchos::RCP<const Epetra_CrsMatrix> MAT = Teuchos::rcp_dynamic_cast<const Epetra_CrsMatrix>(eo);
00079      TEUCHOS_ASSERT(MAT!=Teuchos::null);
00080    
00081      // Create a new EpetraExt_PointToBlockDiagPermute for the state object, if we don't have one
00082      Teuchos::RCP<EpetraExt_PointToBlockDiagPermute> BDP;
00083      if(MyState.BDP_==Teuchos::null) {
00084        BDP = Teuchos::rcp(new EpetraExt_PointToBlockDiagPermute(*MAT));
00085        BDP->SetParameters(List_);
00086        BDP->Compute();
00087        MyState.BDP_ = BDP;
00088      }
00089 
00090      RCP<Epetra_FECrsMatrix> Hcrs=rcp(MyState.BDP_->CreateFECrsMatrix());
00091      return Thyra::epetraLinearOp(Hcrs);
00092    
00093      // Build the LinearOp object  (NTS: swapping the range and domain)
00094      // LinearOp MyOp = Teuchos::rcp(new DiagonalPreconditionerOp(MyState.BDP_,lo->domain(),lo->range()));
00095   }
00096 
00097   return getInvDiagonalOp(lo,diagonalType_);
00098 }
00099 
00100 void DiagonalPreconditionerFactory::initializeFromParameterList(const Teuchos::ParameterList & pl)
00101 {
00102   List_=pl;
00103 
00104   diagonalType_ = BlkDiag;
00105   if(pl.isParameter("Diagonal Type")) {
00106      diagonalType_ = getDiagonalType(pl.get<std::string>("Diagonal Type"));
00107      TEST_FOR_EXCEPT(diagonalType_==NotDiag);
00108   }
00109 
00110   if(diagonalType_==BlkDiag) {
00111      // Reset default to invert mode if the user hasn't specified something else
00112      Teuchos::ParameterList & SubList=List_.sublist("blockdiagmatrix: list");     
00113      SubList.set("apply mode",SubList.get("apply mode","invert"));
00114   }
00115 }
00116 
00117 } // end namespace Teko
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