Teko_IdentityPreconditionerFactory.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_IdentityPreconditionerFactory.hpp"
 
#include "Thyra_DefaultIdentityLinearOp.hpp"
#include "Thyra_DefaultScaledAdjointLinearOp.hpp"
 
using Teuchos::rcp;
 
namespace Teko {

IdentityPreconditionerFactory::IdentityPreconditionerFactory() : scaling_(1.0) {}
 
LinearOp IdentityPreconditionerFactory::buildPreconditionerOperator(
    LinearOp& lo, PreconditionerState& /* state */) const {
  return Thyra::scale(scaling_, Thyra::identity(rangeSpace(lo)));
}

void IdentityPreconditionerFactory::initializeFromParameterList(const Teuchos::ParameterList& pl) {
  Teko_DEBUG_SCOPE("IdentityPreconditionerFactory::initializeFromParameterList", 10);
  Teko_DEBUG_MSG_BEGIN(9);
  DEBUG_STREAM << "Parameter list: " << std::endl;
  pl.print(DEBUG_STREAM);
  Teko_DEBUG_MSG_END();
 
  // get string specifying default inverse
  std::string scaleStr = "Scaling";
  if (pl.isParameter(scaleStr)) scaling_ = pl.get<double>(scaleStr);
}
 
}  // namespace Teko