Teko_SolveInverseFactory.cpp

// @HEADER
// *****************************************************************************
//      Teko: A package for block and physics based preconditioning
//
// Copyright 2010 NTESS and the Teko contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#include "Teko_SolveInverseFactory.hpp"

// Thyra includes
#include "Thyra_DefaultLinearOpSource.hpp"
#include "Thyra_DefaultInverseLinearOp.hpp"
#include "Thyra_DefaultPreconditioner.hpp"

// Stratimikos includes
#include "Stratimikos_DefaultLinearSolverBuilder.hpp"

// Teko includes
#include "Teko_Utilities.hpp"
#include "Teko_BlockPreconditionerFactory.hpp"
#include "Teko_Preconditioner.hpp"
#include "Teko_PreconditionerLinearOp.hpp"

using Teuchos::rcp;
using Teuchos::RCP;
using Teuchos::rcp_const_cast;
using Teuchos::rcp_dynamic_cast;

namespace Teko {

SolveInverseFactory::SolveInverseFactory(
    const Teuchos::RCP<Thyra::LinearOpWithSolveFactoryBase<double> >& lowsFactory)
    : lowsFactory_(lowsFactory) {}

SolveInverseFactory::SolveInverseFactory(const SolveInverseFactory& siFactory)
    : lowsFactory_(siFactory.lowsFactory_) {}

InverseLinearOp SolveInverseFactory::buildInverse(const LinearOp& linearOp) const {
  Teko_DEBUG_SCOPE("SolveInverseFactory::buildInverse(linearOp)", 10);

  // build and initialize inverse linear op with solve
  Teuchos::RCP<Thyra::LinearOpWithSolveBase<double> > invLOWS = lowsFactory_->createOp();
  lowsFactory_->initializeOp(Thyra::defaultLinearOpSource(linearOp), &*invLOWS,
                             Thyra::SUPPORT_SOLVE_FORWARD_ONLY);

  return Thyra::nonconstInverse<double>(invLOWS);
}

InverseLinearOp SolveInverseFactory::buildInverse(const LinearOp& linearOp,
                                                  const LinearOp& precOp) const {
  Teko_DEBUG_SCOPE("SolveInverseFactory::buildInverse(linearOp,precOp)", 10);

  // build and initialize inverse linear op with solve
  Teuchos::RCP<Thyra::LinearOpWithSolveBase<double> > invLOWS = lowsFactory_->createOp();
  lowsFactory_->initializePreconditionedOp(Thyra::defaultLinearOpSource(linearOp),
                                           Thyra::unspecifiedPrec(precOp), &*invLOWS,
                                           Thyra::SUPPORT_SOLVE_FORWARD_ONLY);

  return Thyra::nonconstInverse<double>(invLOWS);
}

void SolveInverseFactory::rebuildInverse(const LinearOp& source, InverseLinearOp& dest) const {
  RCP<Thyra::DefaultInverseLinearOp<double> > invDest =
      rcp_dynamic_cast<Thyra::DefaultInverseLinearOp<double> >(dest);
  RCP<Thyra::LinearOpWithSolveBase<double> > lows = invDest->getNonconstLows();

  // This stems from confusion of if the linear op with solve initializeAndResuseOp actually
  // rebuilds the preconditioner. It seems not to and thus we have a fairly substantial problem.
  // lowsFactory_->initializeAndReuseOp(Thyra::defaultLinearOpSource(source),&*lows);
  lowsFactory_->initializeOp(Thyra::defaultLinearOpSource(source), &*lows);
}

void SolveInverseFactory::rebuildInverse(const LinearOp& source, const LinearOp& precOp,
                                         InverseLinearOp& dest) const {
  RCP<Thyra::DefaultInverseLinearOp<double> > invDest =
      rcp_dynamic_cast<Thyra::DefaultInverseLinearOp<double> >(dest);
  RCP<Thyra::LinearOpWithSolveBase<double> > lows = invDest->getNonconstLows();

  // lowsFactory_->initializeAndReuseOp(Thyra::defaultLinearOpSource(source),&*lows);
  lowsFactory_->initializePreconditionedOp(Thyra::defaultLinearOpSource(source),
                                           Thyra::unspecifiedPrec(precOp), &*lows,
                                           Thyra::SUPPORT_SOLVE_FORWARD_ONLY);
}

Teuchos::RCP<const Teuchos::ParameterList> SolveInverseFactory::getParameterList() const {
  return lowsFactory_->getParameterList();
}

}  // end namespace Teko