Teko_BlockInvDiagonalStrategy.cpp

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//      Teko: A package for block and physics based preconditioning
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#include "Teko_BlockInvDiagonalStrategy.hpp"

namespace Teko {

InvFactoryDiagStrategy::InvFactoryDiagStrategy(const Teuchos::RCP<InverseFactory> & factory)
{
   // only one factory to use!
   invDiagFact_.resize(1,factory);
   defaultInvFact_ = factory;
}

InvFactoryDiagStrategy::InvFactoryDiagStrategy(const std::vector<Teuchos::RCP<InverseFactory> > & factories,
                                               const Teuchos::RCP<InverseFactory> & defaultFact)
{
   invDiagFact_ = factories;

   if(defaultFact==Teuchos::null)
      defaultInvFact_ = invDiagFact_[0];
   else
      defaultInvFact_ = defaultFact;
}

void InvFactoryDiagStrategy::getInvD(const BlockedLinearOp & A,BlockPreconditionerState & state,std::vector<LinearOp> & invDiag) const
{ 
   Teko_DEBUG_SCOPE("InvFactoryDiagStrategy::getInvD",10);

   // loop over diagonals, build an inverse operator for each
   int diagCnt = A->productRange()->numBlocks();
   int invCnt = invDiagFact_.size();

   Teko_DEBUG_MSG("# diags = " << diagCnt << ", # inverses = " << invCnt,6);

   const std::string opPrefix = "JacobiDiagOp";
   if(diagCnt<=invCnt) {
      for(int i=0;i<diagCnt;i++) 
         invDiag.push_back(buildInverse(*invDiagFact_[i],getBlock(i,i,A),state,opPrefix,i));
   }
   else {
      for(int i=0;i<invCnt;i++) 
         invDiag.push_back(buildInverse(*invDiagFact_[i],getBlock(i,i,A),state,opPrefix,i));

      for(int i=invCnt;i<diagCnt;i++) 
         invDiag.push_back(buildInverse(*defaultInvFact_,getBlock(i,i,A),state,opPrefix,i));
   }
}

LinearOp InvFactoryDiagStrategy::buildInverse(const InverseFactory & invFact,const LinearOp & matrix,
                                              BlockPreconditionerState & state,
                                              const std::string & opPrefix,int i) const
{
   std::stringstream ss;
   ss << opPrefix << "_" << i;

   ModifiableLinearOp & invOp = state.getModifiableOp(ss.str());
   if(invOp==Teuchos::null) 
      invOp = Teko::buildInverse(invFact,matrix);
   else 
      rebuildInverse(invFact,matrix,invOp);
 
   return invOp;
}

} // end namespace Teko