Thyra_AztecOOLinearOpWithSolveFactory.cpp

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/*@Header
// ***********************************************************************
// 
//        AztecOO: An Object-Oriented Aztec Linear Solver Package 
//                 Copyright (2002) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//  
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
// 
// ***********************************************************************
//@HEADER
*/


#ifndef SUN_CXX


#include "Thyra_AztecOOLinearOpWithSolveFactory.hpp"
#include "Thyra_AztecOOLinearOpWithSolve.hpp"
#include "Thyra_PreconditionerFactoryHelpers.hpp"
#include "Thyra_EpetraOperatorViewExtractorStd.hpp"
#include "Thyra_ScaledAdjointLinearOpBase.hpp"
#include "Thyra_EpetraLinearOpBase.hpp"
#include "Thyra_EpetraOperatorWrapper.hpp"
#include "EpetraExt_ProductOperator.h"
#include "Teuchos_VerboseObjectParameterListHelpers.hpp"
#include "Teuchos_ParameterList.hpp"
#include "Teuchos_dyn_cast.hpp"
#include "AztecOOParameterList.hpp"


namespace {


const std::string AOOLOWSF_epetraPrecOp_str
= "AOOLOWSF::epetraPrecOp";
const std::string AOOLOWSF_aztec_epetra_epetraFwdOp_str
= "AOOLOWSF::aztec_epetra_epetraFwdOp";
const std::string AOOLOWSF_aztec_epetra_epetraAdjOp_str
= "AOOLOWSF::aztec_epetra_epetraAdjOp";
const std::string AOOLOWSF_rowmatrix_epetraFwdOp_str
= "AOOLOWSF::rowmatrix_epetraFwdOp";
const std::string AOOLOWSF_rowmatrix_epetraPrecOp_str
= "AOOLOWSF::rowmatrix_epetraPrecOp";
const std::string AOOLOWSF_aztec_fwd_epetra_epetraPrecOp_str
= "AOOLOWSF::aztec_fwd_epetra_epetraPrecOp";
const std::string AOOLOWSF_aztec_adj_epetra_epetraPrecOp_str
= "AOOLOWSF::aztec_adj_epetra_epetraPrecOp";
const std::string AOOLOWSF_setPrecondtionerOperator_str
= "AOOLOWSF::setPrecondtionerOperator";
const std::string AOOLOWSF_constructedAztecPreconditoner_str
= "AOOLOWSF::constructedAztecPreconditoner";


const std::string ForwardSolve_name = "Forward Solve";
const std::string AdjointSolve_name = "Adjoint Solve";
const std::string MaxIterations_name = "Max Iterations";
const int MaxIterations_default = 400;
const std::string Tolerance_name = "Tolerance";
const double Tolerance_default = 1e-6;
const std::string OutputEveryRhs_name = "Output Every RHS";
const bool OutputEveryRhs_default = false;
const std::string AztecOO_Settings_name = "AztecOO Settings";


} // namespace


namespace Thyra {


// Constructors/initializers/accessors


AztecOOLinearOpWithSolveFactory::AztecOOLinearOpWithSolveFactory(
  Teuchos::RCP<Teuchos::ParameterList> const& paramList
  )
  :epetraFwdOpViewExtractor_(Teuchos::rcp(new EpetraOperatorViewExtractorStd()))
  ,defaultFwdMaxIterations_(MaxIterations_default)
  ,defaultFwdTolerance_(Tolerance_default)
  ,defaultAdjMaxIterations_(MaxIterations_default)
  ,defaultAdjTolerance_(Tolerance_default)
  ,outputEveryRhs_(OutputEveryRhs_default)
{
  updateThisValidParamList();
  if(paramList.get())
    setParameterList(paramList);
}


// Overridden from LinearOpWithSolveFactoryBase


bool AztecOOLinearOpWithSolveFactory::acceptsPreconditionerFactory() const
{
  return true;
}


void AztecOOLinearOpWithSolveFactory::setPreconditionerFactory(
  const Teuchos::RCP<PreconditionerFactoryBase<double> > &precFactory,
  const std::string &precFactoryName
  )
{
  TEUCHOS_TEST_FOR_EXCEPT(!precFactory.get());
  Teuchos::RCP<const Teuchos::ParameterList>
    precFactoryValidPL = precFactory->getValidParameters();
  const std::string _precFactoryName =
    ( precFactoryName != ""
      ? precFactoryName
      : ( precFactoryValidPL.get()
        ? precFactoryValidPL->name()
        : "GENERIC PRECONDITIONER FACTORY"
        )
      );
  precFactory_ = precFactory;
  precFactoryName_ = _precFactoryName;
  updateThisValidParamList();
}


Teuchos::RCP<PreconditionerFactoryBase<double> >
AztecOOLinearOpWithSolveFactory::getPreconditionerFactory() const
{
  return precFactory_;
}


void AztecOOLinearOpWithSolveFactory::unsetPreconditionerFactory(
  Teuchos::RCP<PreconditionerFactoryBase<double> > *precFactory,
  std::string *precFactoryName
  )
{
  if(precFactory) *precFactory = precFactory_;
  if(precFactoryName) *precFactoryName = precFactoryName_;
  precFactory_ = Teuchos::null;
  precFactoryName_ = "";
  updateThisValidParamList();
}


bool AztecOOLinearOpWithSolveFactory::isCompatible(
  const LinearOpSourceBase<double> &fwdOpSrc
  ) const
{
  return epetraFwdOpViewExtractor_->isCompatible(*fwdOpSrc.getOp());
}


Teuchos::RCP<LinearOpWithSolveBase<double> >
AztecOOLinearOpWithSolveFactory::createOp() const
{
  return Teuchos::rcp(new AztecOOLinearOpWithSolve());
}


void AztecOOLinearOpWithSolveFactory::initializeOp(
  const Teuchos::RCP<const LinearOpSourceBase<double> > &fwdOpSrc,
  LinearOpWithSolveBase<double> *Op,
  const ESupportSolveUse supportSolveUse
  ) const
{
  this->initializeOp_impl(fwdOpSrc,Teuchos::null,Teuchos::null,false,Op);
}


void AztecOOLinearOpWithSolveFactory::initializeAndReuseOp(
  const Teuchos::RCP<const LinearOpSourceBase<double> > &fwdOpSrc,
  LinearOpWithSolveBase<double> *Op
  ) const
{
  this->initializeOp_impl(fwdOpSrc,Teuchos::null,Teuchos::null,true,Op);
}


bool AztecOOLinearOpWithSolveFactory::supportsPreconditionerInputType(
  const EPreconditionerInputType precOpType
  ) const
{
  const_cast<bool&>(useAztecPrec_) = (
    paramList_.get()
    &&
    paramList_->sublist(ForwardSolve_name).sublist(AztecOO_Settings_name).get(
      "Aztec Preconditioner","none"
      )!="none"
    );
  switch(precOpType) {
    case PRECONDITIONER_INPUT_TYPE_AS_OPERATOR:
      return true;
      break;
    case PRECONDITIONER_INPUT_TYPE_AS_MATRIX:
      return useAztecPrec_;
      break;
    default:
      TEUCHOS_TEST_FOR_EXCEPT(true);
  }
  return PRECONDITIONER_INPUT_TYPE_AS_OPERATOR; // Should never be called!
}


void AztecOOLinearOpWithSolveFactory::initializePreconditionedOp(
  const Teuchos::RCP<const LinearOpSourceBase<double> > &fwdOpSrc,
  const Teuchos::RCP<const PreconditionerBase<double> > &prec,
  LinearOpWithSolveBase<double> *Op,
  const ESupportSolveUse supportSolveUse
  ) const
{
  TEUCHOS_TEST_FOR_EXCEPT(prec.get()==NULL);
  this->initializeOp_impl(fwdOpSrc,prec,Teuchos::null,false,Op);
}


void AztecOOLinearOpWithSolveFactory::initializeApproxPreconditionedOp(
  const Teuchos::RCP<const LinearOpSourceBase<double> > &fwdOpSrc,
  const Teuchos::RCP<const LinearOpSourceBase<double> > &approxFwdOpSrc,
  LinearOpWithSolveBase<double> *Op,
  const ESupportSolveUse supportSolveUse
  ) const
{
  TEUCHOS_TEST_FOR_EXCEPT(approxFwdOpSrc.get()==NULL);
  TEUCHOS_TEST_FOR_EXCEPT(approxFwdOpSrc->getOp().get()==NULL);
  this->initializeOp_impl(fwdOpSrc,Teuchos::null,approxFwdOpSrc,false,Op);
}


void AztecOOLinearOpWithSolveFactory::uninitializeOp(
  LinearOpWithSolveBase<double> *Op,
  Teuchos::RCP<const LinearOpSourceBase<double> > *fwdOpSrc,
  Teuchos::RCP<const PreconditionerBase<double> > *prec,
  Teuchos::RCP<const LinearOpSourceBase<double> > *approxFwdOpSrc,
  ESupportSolveUse *supportSolveUse
  ) const
{
#ifdef TEUCHOS_DEBUG
  TEUCHOS_TEST_FOR_EXCEPT(Op==NULL);
#endif
  AztecOOLinearOpWithSolve
    *aztecOp = &Teuchos::dyn_cast<AztecOOLinearOpWithSolve>(*Op);
  // Extract and unset the fwdOP and approxFwdOp objects
  Teuchos::RCP<const LinearOpSourceBase<double> >
    _fwdOpSrc = aztecOp->extract_fwdOpSrc(), // Will be null if not initialized!
    _approxFwdOpSrc = aztecOp->extract_approxFwdOpSrc(); // Will be null if not set
  if(fwdOpSrc) *fwdOpSrc = _fwdOpSrc;
  if(approxFwdOpSrc) *approxFwdOpSrc = _approxFwdOpSrc;
  // Only extract and uset the prec object if it is external.  If it is
  // internal, then we need to hold on to this so that we can reinitialize it
  // later.
  if(aztecOp->isExternalPrec()) {
    Teuchos::RCP<const PreconditionerBase<double> >
      _prec = aztecOp->extract_prec(); // Will be null if not external preconditioner was set
    if(prec) *prec = _prec;
  }
  // ToDo: Extract the Epetra_Operator views what where used to initialize the
  // forward and adjoint solvers!  This is needed to make this totally
  // stateless.
}


// Overridden from ParameterListAcceptor


void AztecOOLinearOpWithSolveFactory::setParameterList(
  Teuchos::RCP<Teuchos::ParameterList> const& paramList
  )
{
  TEUCHOS_TEST_FOR_EXCEPT(paramList.get()==NULL);
  paramList->validateParameters(*this->getValidParameters());
  paramList_ = paramList;
  //
  outputEveryRhs_ = paramList_->get(OutputEveryRhs_name,OutputEveryRhs_default);
  // Foward Solve parameters
  Teuchos::ParameterList
    &fwdSolvePL = paramList_->sublist(ForwardSolve_name);
  defaultFwdMaxIterations_ = fwdSolvePL.get(MaxIterations_name,defaultFwdMaxIterations_);
  defaultFwdTolerance_ = fwdSolvePL.get(Tolerance_name,defaultFwdTolerance_);
  // Adjoint Solve parameters
  if( !paramList_->getPtr<Teuchos::ParameterList>(AdjointSolve_name) ) {
    // If adjoint solve sublist is not set, then use the forward solve parameters
    paramList_->sublist(AdjointSolve_name).setParameters(fwdSolvePL);
  }
  Teuchos::ParameterList
    &adjSolvePL = paramList_->sublist(AdjointSolve_name);
  defaultAdjMaxIterations_ = adjSolvePL.get(MaxIterations_name,defaultAdjMaxIterations_);
  defaultAdjTolerance_ = adjSolvePL.get(Tolerance_name,defaultAdjTolerance_);
  //
  if(precFactory_.get()) {
    // Only reset the PF's PL if the sublist exists or the PF does not already
    // have a PL.  We don't want to overwrite an externally set PL for the PF
    // if we don't have a nested sublist defined here!
    const bool nestedPFSublistExists = paramList_->isSublist(precFactoryName_);
    const bool alreadyHasSublist = !is_null(precFactory_->getParameterList());
    if( nestedPFSublistExists || !alreadyHasSublist ) {
      precFactory_->setParameterList(Teuchos::sublist(paramList_,precFactoryName_));
    }
  }
  Teuchos::readVerboseObjectSublist(&*paramList_,this);
}


Teuchos::RCP<Teuchos::ParameterList>
AztecOOLinearOpWithSolveFactory::getNonconstParameterList()
{
  return paramList_;
}


Teuchos::RCP<Teuchos::ParameterList>
AztecOOLinearOpWithSolveFactory::unsetParameterList()
{
  Teuchos::RCP<Teuchos::ParameterList> _paramList = paramList_;
  paramList_ = Teuchos::null;
  return _paramList;
}


Teuchos::RCP<const Teuchos::ParameterList>
AztecOOLinearOpWithSolveFactory::getParameterList() const
{
  return paramList_;
}


Teuchos::RCP<const Teuchos::ParameterList>
AztecOOLinearOpWithSolveFactory::getValidParameters() const
{
  return thisValidParamList_;
}


// Public functions overridden from Teuchos::Describable


std::string AztecOOLinearOpWithSolveFactory::description() const
{
  std::ostringstream oss;
  oss << "Thyra::AztecOOLinearOpWithSolveFactory{";
  oss << "precFactory=";
  if(!is_null(precFactory_))
    oss << precFactory_->description();
  else
    oss << "NULL";
  oss << "}";
  return oss.str();
}


// private


Teuchos::RCP<const Teuchos::ParameterList>
AztecOOLinearOpWithSolveFactory::generateAndGetValidParameters()
{
  static Teuchos::RCP<Teuchos::ParameterList> validParamList;
  if(validParamList.get()==NULL) {
    validParamList = Teuchos::rcp(
      new Teuchos::ParameterList("AztecOOLinearOpWithSolveFactory"));
    validParamList->set(
      OutputEveryRhs_name,OutputEveryRhs_default
      ,"Determines if output is created for each individual RHS (true or 1) or if output\n"
      "is just created for an entire set of RHSs (false or 0)."
      );
    static Teuchos::RCP<const Teuchos::ParameterList>
      aztecParamList = getValidAztecOOParameters();
    Teuchos::ParameterList
      &fwdSolvePL = validParamList->sublist(
        ForwardSolve_name, false
        ,"Gives the options for the forward solve."
        );
    fwdSolvePL.set(
      Tolerance_name,Tolerance_default
      ,"The tolerence used in the convergence check (see the convergence test\n"
      "in the sublist \"" + AztecOO_Settings_name + "\")"
      );
    fwdSolvePL.set(
      MaxIterations_name,MaxIterations_default
      ,"The maximum number of iterations the AztecOO solver is allowed to perform." 
      );
    fwdSolvePL.sublist(
      AztecOO_Settings_name,false
      ,"Sets the parameters on the AztecOO object itself."
      ).setParameters(*aztecParamList);
    Teuchos::ParameterList
      &adjSolvePL = validParamList->sublist(
        AdjointSolve_name, false
        ,"The options for the adjoint solve.\n"
        "If this sublist is missing then the parameters from the\n"
        "\""+ForwardSolve_name+"\" sublist are used instead."
        );
    // Make the adjoint solve have same defaults as forward solve
    adjSolvePL.setParameters(fwdSolvePL);
  }
  return validParamList;
}


void AztecOOLinearOpWithSolveFactory::updateThisValidParamList()
{
  thisValidParamList_ = Teuchos::rcp(
    new Teuchos::ParameterList(*generateAndGetValidParameters())
    );
  if(precFactory_.get()) {
    Teuchos::RCP<const Teuchos::ParameterList>
      precFactoryValidParamList = precFactory_->getValidParameters();
    if(precFactoryValidParamList.get()) {
      thisValidParamList_->sublist(precFactoryName_).setParameters(
        *precFactoryValidParamList);
    }
  }
  Teuchos::setupVerboseObjectSublist(&*thisValidParamList_);
}


void AztecOOLinearOpWithSolveFactory::initializeOp_impl(
  const Teuchos::RCP<const LinearOpSourceBase<double> > &fwdOpSrc,
  const Teuchos::RCP<const PreconditionerBase<double> > &prec,
  const Teuchos::RCP<const LinearOpSourceBase<double> > &approxFwdOpSrc,
  const bool reusePrec,
  LinearOpWithSolveBase<double> *Op
  ) const
{
  using Teuchos::RCP;
  using Teuchos::null;
  using Teuchos::rcp;
  using Teuchos::rcp_dynamic_cast;
  using Teuchos::rcp_const_cast;
  using Teuchos::set_extra_data;
  using Teuchos::get_optional_extra_data;
  using Teuchos::get_optional_nonconst_extra_data;
  using Teuchos::outArg;
  typedef EpetraExt::ProductOperator PO;

  const Teuchos::RCP<Teuchos::FancyOStream> out = this->getOStream();
  const Teuchos::EVerbosityLevel verbLevel = this->getVerbLevel();
  Teuchos::OSTab tab(out);
  if(out.get() && static_cast<int>(verbLevel) > static_cast<int>(Teuchos::VERB_LOW))
    *out << "\nEntering Thyra::AztecOOLinearOpWithSolveFactory::initializeOp_impl(...) ...\n";

  typedef Teuchos::VerboseObjectTempState<PreconditionerFactoryBase<double> > VOTSPF;
  VOTSPF precFactoryOutputTempState(precFactory_,out,verbLevel);

#ifdef TEUCHOS_DEBUG
  TEUCHOS_TEST_FOR_EXCEPT(Op==NULL);
  TEUCHOS_TEST_FOR_EXCEPT(fwdOpSrc.get()==NULL);
  TEUCHOS_TEST_FOR_EXCEPT(fwdOpSrc->getOp().get()==NULL);
#endif

  // 
  // Determine whether the operators are EpetraLinearOp objects. If so, we're
  // good to go.  If not, we need to wrap it as an Epetra_Operator with some
  // invasive code.
  //
  Teuchos::RCP<const LinearOpBase<double> >
    tmpFwdOp = fwdOpSrc->getOp(),
    tmpApproxFwdOp = ( approxFwdOpSrc.get() ? approxFwdOpSrc->getOp() : Teuchos::null );
  Teuchos::RCP<const LinearOpBase<double> > fwdOp;
  Teuchos::RCP<const LinearOpBase<double> > approxFwdOp;
  if ( dynamic_cast<const EpetraLinearOpBase*>(tmpFwdOp.get())!=0 )
  {
    fwdOp = tmpFwdOp;
    approxFwdOp = tmpApproxFwdOp;
  }
  else
  {
    fwdOp = makeEpetraWrapper(tmpFwdOp);
    if (
      tmpApproxFwdOp.get()
      &&
      dynamic_cast<const EpetraLinearOpBase*>(&*tmpApproxFwdOp.get())
      )
    {
      approxFwdOp = makeEpetraWrapper(tmpApproxFwdOp);
    }
  }
  
  //
  // Get the AztecOOLinearOpWithSolve object
  //
  AztecOOLinearOpWithSolve
    *aztecOp = &Teuchos::dyn_cast<AztecOOLinearOpWithSolve>(*Op);

  //
  // Unwrap and get the forward operator or matrix
  //
  Teuchos::RCP<const Epetra_Operator> epetra_epetraFwdOp;
  EOpTransp epetra_epetraFwdOpTransp;
  EApplyEpetraOpAs epetra_epetraFwdOpApplyAs;
  EAdjointEpetraOp epetra_epetraFwdOpAdjointSupport;
  double epetra_epetraFwdOpScalar;
  epetraFwdOpViewExtractor_->getEpetraOpView(
    fwdOp,
    outArg(epetra_epetraFwdOp), outArg(epetra_epetraFwdOpTransp),
    outArg(epetra_epetraFwdOpApplyAs), outArg(epetra_epetraFwdOpAdjointSupport),
    outArg(epetra_epetraFwdOpScalar)
    );
  TEUCHOS_TEST_FOR_EXCEPTION(
    epetra_epetraFwdOp.get()==NULL, std::logic_error
    ,"Error, The input fwdOp object must be fully initialized "
    "before calling this function!"
    );

  //
  // Get the preconditioner object to use
  //
  Teuchos::RCP<PreconditionerBase<double> >        myPrec;
  Teuchos::RCP<const PreconditionerBase<double> >  precUsed;
  if (prec.get()) {
    // We will be used the passed in external preconditioner
    precUsed = prec;
  }
  else if (precFactory_.get() ) {
    // We will be creating our own preconditioner using an externally set
    // preconditioner factory
    myPrec =
      ( !aztecOp->isExternalPrec()
        ? Teuchos::rcp_const_cast<PreconditionerBase<double> >(
          aztecOp->extract_prec())
        : Teuchos::null
        );
    if(myPrec.get()) {
      // ToDo: Get the forward operator and validate that it is the same
      // operator that is used here!
    }
    else {
      myPrec = precFactory_->createPrec();
    }
    precFactory_->initializePrec(fwdOpSrc,&*myPrec);
    precUsed = myPrec;
  }

  //
  // Unwrap and get the preconditioner operator
  //
  RCP<const LinearOpBase<double> > rightPrecOp;
  if (precUsed.get()) {
    RCP<const LinearOpBase<double> > unspecified = precUsed->getUnspecifiedPrecOp();
    RCP<const LinearOpBase<double> > left = precUsed->getLeftPrecOp();
    RCP<const LinearOpBase<double> > right = precUsed->getRightPrecOp();
    TEUCHOS_TEST_FOR_EXCEPTION(
      !( left.get() || right.get() || unspecified.get() ), std::logic_error
      ,"Error, at least one preconditoner linear operator objects must be set!"
      );
    if(unspecified.get()) {
      rightPrecOp = unspecified;
    }
    else {
      // Set a left, right or split preconditioner
      TEUCHOS_TEST_FOR_EXCEPTION(
        left.get(),std::logic_error
        ,"Error, we can not currently handle a left"
        " preconditioner with the AztecOO/Thyra adapters!"
        );
      rightPrecOp = right;
    }
  }
  double wrappedPrecOpScalar = 0.0;
  EOpTransp wrappedPrecOpTransp = NOTRANS;
  RCP<const LinearOpBase<double> > wrappedPrecOp = null;
  RCP<const EpetraLinearOpBase> epetraPrecOp;
  Teuchos::RCP<const Epetra_Operator> epetra_epetraPrecOp;
  EOpTransp epetra_epetraPrecOpTransp;
  EApplyEpetraOpAs epetra_epetraPrecOpApplyAs;
  EAdjointEpetraOp epetra_epetraPrecOpAdjointSupport;
  EOpTransp overall_epetra_epetraPrecOpTransp;
  if(rightPrecOp.get()) {
    RCP<const LinearOpBase<double> > tmpWrappedPrecOp;
    unwrap(
      rightPrecOp,&wrappedPrecOpScalar,&wrappedPrecOpTransp,&tmpWrappedPrecOp);
    if( dynamic_cast<const EpetraLinearOpBase*>(&*tmpWrappedPrecOp) ) {
      wrappedPrecOp = tmpWrappedPrecOp;
    }
    else {
      wrappedPrecOp = makeEpetraWrapper(tmpWrappedPrecOp);
    }
    epetraPrecOp = rcp_dynamic_cast<const EpetraLinearOpBase>(
      wrappedPrecOp,true);
    epetraPrecOp->getEpetraOpView(
      outArg(epetra_epetraPrecOp), outArg(epetra_epetraPrecOpTransp),
      outArg(epetra_epetraPrecOpApplyAs), outArg(epetra_epetraPrecOpAdjointSupport));
    TEUCHOS_TEST_FOR_EXCEPTION(
      epetra_epetraPrecOp.get()==NULL,std::logic_error
      ,"Error, The input prec object and its embedded preconditioner"
      " operator must be fully initialized before calling this function!"
      );
    // 2007/08/10: rabartl: This next set_extra_data(...) call is likely to be
    // setting up a circular reference!  Since epetra_epetraPrecOp was
    // gotten from epetraPrecOp, if you set epetraPrecOp as extra data
    // on the RCP epetra_epetraPrecOp then you have a circular reference!
    //set_extra_data(
    //  epetraPrecOp, AOOLOWSF_epetraPrecOp_str, &epetra_epetraPrecOp,
    //  Teuchos::POST_DESTROY, false );
    overall_epetra_epetraPrecOpTransp
      = trans_trans(
        real_trans(wrappedPrecOpTransp),
        real_trans(epetra_epetraPrecOpTransp)
        );
  }
  
  //
  // Unwrap and get the approximate forward operator to be used to generate a
  // preconditioner
  //
  if(approxFwdOp.get()) {
    // Note, here we just use the same members data that would be set for an
    // extenral preconditioner operator since it is not getting used.
    unwrap(approxFwdOp,&wrappedPrecOpScalar,&wrappedPrecOpTransp,&wrappedPrecOp);
    epetraPrecOp = rcp_dynamic_cast<const EpetraLinearOpBase>(
      wrappedPrecOp,true);
    epetraPrecOp->getEpetraOpView(
      outArg(epetra_epetraPrecOp), outArg(epetra_epetraPrecOpTransp),
      outArg(epetra_epetraPrecOpApplyAs), outArg(epetra_epetraPrecOpAdjointSupport)
      );
    TEUCHOS_TEST_FOR_EXCEPTION(
      epetra_epetraPrecOp.get()==NULL,std::logic_error
      ,"Error, The input approxFwdOp object must be fully initialized"
      " before calling this function!"
      );
    // 2007/08/10: rabartl: This next set_extra_data(...) call is likely to be
    // setting up a circular reference!  Since epetra_epetraPrecOp was
    // gotten from epetraPrecOp, if you set epetraPrecOp as extra data
    // on the RCP epetra_epetraPrecOp then you have a circular reference!
    //set_extra_data(
    //  epetraPrecOp, AOOLOWSF_epetraPrecOp_str, &epetra_epetraPrecOp,
    //  Teuchos::POST_DESTROY, false
    //  );
    overall_epetra_epetraPrecOpTransp
      = trans_trans(
        real_trans(wrappedPrecOpTransp),
        real_trans(epetra_epetraPrecOpTransp)
        );
  }

  //
  // Determine if the forward and preconditioner operators are a row matrices
  // or not
  //
  RCP<const Epetra_RowMatrix>
    rowmatrix_epetraFwdOp  = rcp_dynamic_cast<const Epetra_RowMatrix>(
      epetra_epetraFwdOp),
    rowmatrix_epetraPrecOp = rcp_dynamic_cast<const Epetra_RowMatrix>(
      epetra_epetraPrecOp);
  //
  // Determine the type of preconditoner
  //
  // Update useAztecPrec_, input value does not matter
  this->supportsPreconditionerInputType(PRECONDITIONER_INPUT_TYPE_AS_MATRIX);
  enum ELocalPrecType {
    PT_NONE, PT_AZTEC_FROM_OP, PT_AZTEC_FROM_APPROX_FWD_MATRIX,
    PT_FROM_PREC_OP
  };
  ELocalPrecType localPrecType;
  if( precUsed.get()==NULL && approxFwdOp.get()==NULL && !useAztecPrec_ ) {
    // No preconditioning at all!
    localPrecType = PT_NONE;
  }
  else if( precUsed.get()==NULL && approxFwdOp.get()==NULL && useAztecPrec_ ) {
    // We are using the forward matrix for the preconditioner using aztec
    // preconditioners
    localPrecType = PT_AZTEC_FROM_OP;
  }
  else if( approxFwdOp.get() && useAztecPrec_ ) {
    // The preconditioner comes from the input as a matrix and we are using
    // aztec preconditioners
    localPrecType = PT_AZTEC_FROM_APPROX_FWD_MATRIX;
  }
  else if( precUsed.get() ) {
    // The preconditioner comes as an external operator so let's use it as
    // such
    localPrecType = PT_FROM_PREC_OP;
  }
  
  //
  // Determine if aztecOp already contains solvers and if we need to
  // reinitialize or not
  //
  RCP<AztecOO> aztecFwdSolver, aztecAdjSolver;
  bool startingOver;
  {
    // Let's assume that fwdOp, prec and/or approxFwdOp are compatible with
    // the already created AztecOO objects.  If they are not, then the client
    // should have created a new LOWSB object from scratch!
    Teuchos::RCP<const LinearOpBase<double> > old_fwdOp;
    Teuchos::RCP<const LinearOpSourceBase<double> > old_fwdOpSrc;
    Teuchos::RCP<const PreconditionerBase<double> > old_prec;
    bool old_isExternalPrec;
    Teuchos::RCP<const LinearOpSourceBase<double> > old_approxFwdOpSrc;
    Teuchos::RCP<AztecOO> old_aztecFwdSolver;
    Teuchos::RCP<AztecOO> old_aztecAdjSolver;
    double old_aztecSolverScalar;
    aztecOp->uninitialize(
      &old_fwdOp
      ,&old_fwdOpSrc
      ,&old_prec
      ,&old_isExternalPrec
      ,&old_approxFwdOpSrc
      ,&old_aztecFwdSolver
      ,NULL
      ,&old_aztecAdjSolver
      ,NULL
      ,&old_aztecSolverScalar
      );
    if( old_aztecFwdSolver.get()==NULL ) {
      // This has never been initialized before
      startingOver = true;
    }
    else {
      // Let's assume that fwdOp, prec and/or approxFwdOp are compatible with
      // the already created AztecOO objects.  If they are not, then the
      // client should have created a new LOWSB object from scratch!
      aztecFwdSolver = old_aztecFwdSolver;
      aztecAdjSolver = old_aztecAdjSolver;
      startingOver = false;
      // We must wipe out the old preconditoner if we are not reusing the
      // preconditioner
      Ptr<bool> constructedAztecPreconditioner;
      if(
        !reusePrec
        &&
        !is_null(constructedAztecPreconditioner = get_optional_nonconst_extra_data<bool>(
                   aztecFwdSolver, "AOOLOWSF::constructedAztecPreconditoner") )
        &&
        *constructedAztecPreconditioner
        )
      {
        aztecFwdSolver->DestroyPreconditioner();
        *constructedAztecPreconditioner = false;
      }
      // We must see if we set an external preconditioner but will not do so
      // again in which case we must blow away AztecOO and start over again!
      Ptr<bool> setPreconditionerOperator;
      if(
        localPrecType != PT_FROM_PREC_OP
        && !is_null( setPreconditionerOperator = get_optional_nonconst_extra_data<bool>(
               aztecFwdSolver,"AOOLOWSF::setPreconditonerOperator") )
        && *setPreconditionerOperator
        )
      {
        // We must start over again since there is no way to unset an external
        // preconditioner!
        startingOver = true;
      }
    }
  }

  //
  // Create the AztecOO solvers if we are starting over
  //
  startingOver = true; // ToDo: Remove this and figure out why this is not working!
  if(startingOver) {
    // Forward solver
    aztecFwdSolver = rcp(new AztecOO());
    aztecFwdSolver->SetAztecOption(AZ_diagnostics,AZ_none); // This was turned off in NOX?
    aztecFwdSolver->SetAztecOption(AZ_keep_info,1);
    // Adjoint solver (if supported)
    if(
      epetra_epetraFwdOpAdjointSupport==EPETRA_OP_ADJOINT_SUPPORTED
      &&
      localPrecType!=PT_AZTEC_FROM_OP && localPrecType!=PT_AZTEC_FROM_APPROX_FWD_MATRIX
      )
    {
      aztecAdjSolver = rcp(new AztecOO());
      aztecAdjSolver->SetAztecOption(AZ_diagnostics,AZ_none);
      //aztecAdjSolver->SetAztecOption(AZ_keep_info,1);
    }
  }

  //
  // Set the options on the AztecOO solvers
  //
  if( startingOver ) {
    if(paramList_.get())
      setAztecOOParameters(
        &paramList_->sublist(ForwardSolve_name).sublist(AztecOO_Settings_name),
        &*aztecFwdSolver
        );
    if(aztecAdjSolver.get() && paramList_.get())
      setAztecOOParameters(
        &paramList_->sublist(AdjointSolve_name).sublist(AztecOO_Settings_name),
        &*aztecAdjSolver
        );
  }
  
  //
  // Process the forward operator
  //
  RCP<const Epetra_Operator>
    aztec_epetra_epetraFwdOp,
    aztec_epetra_epetraAdjOp;
  // Forward solve
  RCP<const Epetra_Operator>
    epetraOps[]
    = { epetra_epetraFwdOp };
  Teuchos::ETransp
    epetraOpsTransp[]
    = { epetra_epetraFwdOpTransp==NOTRANS ? Teuchos::NO_TRANS : Teuchos::TRANS };
  PO::EApplyMode
    epetraOpsApplyMode[]
    = { epetra_epetraFwdOpApplyAs==EPETRA_OP_APPLY_APPLY
        ? PO::APPLY_MODE_APPLY
        : PO::APPLY_MODE_APPLY_INVERSE };
  if(
    epetraOpsTransp[0] == Teuchos::NO_TRANS
    &&
    epetraOpsApplyMode[0] == PO::APPLY_MODE_APPLY
    )
  {
    aztec_epetra_epetraFwdOp = epetra_epetraFwdOp;
  }
  else
  {
    aztec_epetra_epetraFwdOp = rcp(
      new PO(1,epetraOps,epetraOpsTransp,epetraOpsApplyMode));
  }
  if(
    startingOver
    ||
    aztec_epetra_epetraFwdOp.get() != aztecFwdSolver->GetUserOperator() 
    )
  {
    // Here we will be careful not to reset the forward operator in fears that
    // it will blow out the internally created stuff.
    aztecFwdSolver->SetUserOperator(
      const_cast<Epetra_Operator*>(&*aztec_epetra_epetraFwdOp));
    set_extra_data(
      aztec_epetra_epetraFwdOp, AOOLOWSF_aztec_epetra_epetraFwdOp_str,
      Teuchos::inOutArg(aztecFwdSolver), Teuchos::POST_DESTROY, false
      );
  }
  // Adjoint solve
  if( aztecAdjSolver.get() ) {
    epetraOpsTransp[0] = (
      epetra_epetraFwdOpTransp==NOTRANS
      ? Teuchos::TRANS
      : Teuchos::NO_TRANS
      );
    if(
      epetraOpsTransp[0] == Teuchos::NO_TRANS
      &&
      epetraOpsApplyMode[0] == PO::APPLY_MODE_APPLY
      )
    {
      aztec_epetra_epetraAdjOp = epetra_epetraFwdOp;
    }
    else {
      aztec_epetra_epetraAdjOp = rcp(
        new PO(1,epetraOps,epetraOpsTransp,epetraOpsApplyMode));
    }
    aztecAdjSolver->SetUserOperator(
      const_cast<Epetra_Operator*>(&*aztec_epetra_epetraAdjOp));
    set_extra_data(
      aztec_epetra_epetraAdjOp, AOOLOWSF_aztec_epetra_epetraAdjOp_str,
      Teuchos::inOutArg(aztecAdjSolver), Teuchos::POST_DESTROY, false
      );
  }
  
  //
  // Process the preconditioner
  //
  RCP<const Epetra_Operator>
    aztec_fwd_epetra_epetraPrecOp,
    aztec_adj_epetra_epetraPrecOp;
  bool setAztecPreconditioner = false;
  switch(localPrecType) {
    case PT_NONE: {
      //
      // No preconditioning at all!
      //
      break;
    }
    case PT_AZTEC_FROM_OP: {
      //
      // We are using the forward matrix for the preconditioner using aztec
      // preconditioners
      //
      if( startingOver || !reusePrec ) {
        TEUCHOS_TEST_FOR_EXCEPTION(
          rowmatrix_epetraFwdOp.get()==NULL, std::logic_error,
          "AztecOOLinearOpWithSolveFactory::initializeOp_impl(...): "
          "Error, There is no preconditioner given by client, but the client "
          "passed in an Epetra_Operator for the forward operator of type \'"
          <<typeName(*epetra_epetraFwdOp)<<"\' that does not "
          "support the Epetra_RowMatrix interface!"
          );
        TEUCHOS_TEST_FOR_EXCEPTION(
          epetra_epetraFwdOpTransp!=NOTRANS, std::logic_error,
          "AztecOOLinearOpWithSolveFactory::initializeOp_impl(...):"
          " Error, There is no preconditioner given by client and the client "
          "passed in an Epetra_RowMatrix for the forward operator but the "
          "overall transpose is not NOTRANS and therefore we can can just "
          "hand this over to aztec without making a copy which is not supported here!"
          );
        aztecFwdSolver->SetPrecMatrix(
          const_cast<Epetra_RowMatrix*>(&*rowmatrix_epetraFwdOp));
        set_extra_data(
          rowmatrix_epetraFwdOp, AOOLOWSF_rowmatrix_epetraFwdOp_str,
          Teuchos::inOutArg(aztecFwdSolver), Teuchos::POST_DESTROY, false
          );
      }
      setAztecPreconditioner = true;
      break;
    }
    case PT_AZTEC_FROM_APPROX_FWD_MATRIX: {
      //
      // The preconditioner comes from the input as a matrix and we are using
      // aztec preconditioners
      //
      if( startingOver || !reusePrec ) {
        TEUCHOS_TEST_FOR_EXCEPTION(
          rowmatrix_epetraPrecOp.get()==NULL, std::logic_error
          ,"AztecOOLinearOpWithSolveFactor::initializeOp_impl(...): The client "
          "passed in an Epetra_Operator for the preconditioner matrix of type \'"
          <<typeName(*epetra_epetraPrecOp)<<"\' that does not "
          "support the Epetra_RowMatrix interface!"
          );
        TEUCHOS_TEST_FOR_EXCEPTION(
          overall_epetra_epetraPrecOpTransp!=NOTRANS, std::logic_error
          ,"AztecOOLinearOpWithSolveFactor::initializeOp_impl(...): Error, The client "
          "passed in an Epetra_RowMatrix for the preconditoner matrix but the overall "
          "transpose is not NOTRANS and therefore we can can just "
          "hand this over to aztec without making a copy which is not supported here!"
          );
        aztecFwdSolver->SetPrecMatrix(
          const_cast<Epetra_RowMatrix*>(&*rowmatrix_epetraPrecOp));
        set_extra_data(
          rowmatrix_epetraPrecOp, AOOLOWSF_rowmatrix_epetraPrecOp_str,
          Teuchos::inOutArg(aztecFwdSolver), Teuchos::POST_DESTROY, false
          );
      }
      setAztecPreconditioner = true;
      break;
    }
    case PT_FROM_PREC_OP: {
      //
      // The preconditioner comes as an operator so let's use it as such
      //
      // Forward solve
      RCP<const Epetra_Operator>
        epetraOps[]
        = { epetra_epetraPrecOp };
      Teuchos::ETransp
        epetraOpsTransp[]
        = { overall_epetra_epetraPrecOpTransp==NOTRANS
            ? Teuchos::NO_TRANS
            : Teuchos::TRANS };
      // Here we must toggle the apply mode since aztecoo applies the
      // preconditioner using ApplyInverse(...)
      PO::EApplyMode
        epetraOpsApplyMode[]
        = { epetra_epetraPrecOpApplyAs==EPETRA_OP_APPLY_APPLY
            ? PO::APPLY_MODE_APPLY_INVERSE
            : PO::APPLY_MODE_APPLY };
      if(
        epetraOpsTransp[0] == Teuchos::NO_TRANS
        &&
        epetra_epetraPrecOpApplyAs==EPETRA_OP_APPLY_APPLY_INVERSE
        )
      {
        aztec_fwd_epetra_epetraPrecOp = epetra_epetraPrecOp;
      }
      else {
        aztec_fwd_epetra_epetraPrecOp = rcp(new PO(1,epetraOps,epetraOpsTransp,epetraOpsApplyMode));
      }
      aztecFwdSolver->SetPrecOperator(
        const_cast<Epetra_Operator*>(&*aztec_fwd_epetra_epetraPrecOp));
      set_extra_data(
        aztec_fwd_epetra_epetraPrecOp, AOOLOWSF_aztec_fwd_epetra_epetraPrecOp_str,
        Teuchos::inOutArg(aztecFwdSolver), Teuchos::POST_DESTROY, false
        );
      // Adjoint solve
      if(
        aztecAdjSolver.get()
        &&
        epetra_epetraPrecOpAdjointSupport == EPETRA_OP_ADJOINT_SUPPORTED
        )
      {
        epetraOpsTransp[0] = ( 
          overall_epetra_epetraPrecOpTransp==NOTRANS
          ? Teuchos::TRANS
          : Teuchos::NO_TRANS
          );
        if(
          epetraOpsTransp[0] == Teuchos::NO_TRANS
          &&
          epetra_epetraPrecOpApplyAs==EPETRA_OP_APPLY_APPLY_INVERSE
          )
        {
          aztec_adj_epetra_epetraPrecOp = epetra_epetraPrecOp;
        }
        else {
          aztec_adj_epetra_epetraPrecOp = rcp(
            new PO(1,epetraOps,epetraOpsTransp,epetraOpsApplyMode));
        }
        aztecAdjSolver->SetPrecOperator(
          const_cast<Epetra_Operator*>(&*aztec_adj_epetra_epetraPrecOp));
        set_extra_data(
          aztec_adj_epetra_epetraPrecOp, AOOLOWSF_aztec_adj_epetra_epetraPrecOp_str,
          Teuchos::inOutArg(aztecAdjSolver), Teuchos::POST_DESTROY, false
          );
        set_extra_data<bool>(
          true, AOOLOWSF_setPrecondtionerOperator_str,
          Teuchos::inOutArg(aztecFwdSolver), Teuchos::POST_DESTROY, false
          );
      }
      break;
    }
    default:
      TEUCHOS_TEST_FOR_EXCEPT(true);
  }
  
  //
  // Initialize the interal aztec preconditioner
  //
  if(setAztecPreconditioner) {
    if( startingOver || !reusePrec ) {
      double condNumEst = -1.0;
      TEUCHOS_TEST_FOR_EXCEPT(0!=aztecFwdSolver->ConstructPreconditioner(condNumEst));
      //aztecFwdSolver->SetAztecOption(AZ_pre_calc, AZ_calc);
      set_extra_data<bool>(
        true, AOOLOWSF_constructedAztecPreconditoner_str,
        Teuchos::inOutArg(aztecFwdSolver), Teuchos::POST_DESTROY, false
        );
    }
    else {
      //aztecFwdSolver->SetAztecOption(AZ_pre_calc, AZ_reuse);
    }
  }

  //
  // Initialize the AztecOOLinearOpWithSolve object and set its options
  //
  if(aztecAdjSolver.get() && aztecAdjSolver->GetPrecOperator()) {
    aztecOp->initialize(
      fwdOp, fwdOpSrc,precUsed, prec.get()!=NULL, approxFwdOpSrc,
      aztecFwdSolver, true, aztecAdjSolver, true, epetra_epetraFwdOpScalar
      );
  }
  else {
    aztecOp->initialize(
      fwdOp, fwdOpSrc, precUsed, prec.get()!=NULL, approxFwdOpSrc,
      aztecFwdSolver, true, null, false, epetra_epetraFwdOpScalar
      );
  }
  aztecOp->fwdDefaultMaxIterations(defaultFwdMaxIterations_);
  aztecOp->fwdDefaultTol(defaultFwdTolerance_);
  aztecOp->adjDefaultMaxIterations(defaultAdjMaxIterations_);
  aztecOp->adjDefaultTol(defaultAdjTolerance_);
  aztecOp->outputEveryRhs(outputEveryRhs_);
  aztecOp->setOStream(this->getOStream());
  if(!is_null(this->getOverridingOStream()))
    aztecOp->setOverridingOStream(this->getOverridingOStream());
  aztecOp->setVerbLevel(this->getVerbLevel());

#ifdef TEUCHOS_DEBUG
  if(paramList_.get())
    paramList_->validateParameters(*this->getValidParameters());
#endif

  if(out.get() && static_cast<int>(verbLevel) > static_cast<int>(Teuchos::VERB_LOW))
    *out << "\nLeaving Thyra::AztecOOLinearOpWithSolveFactory::initializeOp_impl(...) ...\n";

}


} // namespace Thyra


#endif // SUN_CXX