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// $Id$
// $Source$

//@HEADER
// ************************************************************************
//
//            NOX: An Object-Oriented Nonlinear 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.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Roger Pawlowski (rppawlo@sandia.gov) or
// Eric Phipps (etphipp@sandia.gov), Sandia National Laboratories.
// ************************************************************************
//  CVS Information
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//@HEADER

#ifndef NOX_STATUSTEST_COMBO_H
#define NOX_STATUSTEST_COMBO_H

#include "NOX_StatusTest_Generic.H" // base class
#include "NOX_Common.H"            // class data element (vector)
#include "NOX_Utils.H"              // class data element

namespace NOX {

namespace StatusTest {

/*!
  \brief Arbitrary combination of status tests.

  In the \c AND (see NOX::StatusTest::Combo::ComboType) combination, the
  result is \c Unconverged (see NOX::StatusTest::StatusType) if \e any of
  the tests is \c Unconverged. Otherwise, the result is equal to the
  result of the \e first test in the list that is either \c Converged
  or \c Failed. It is not recommended to mix \c Converged and \c
  Failed tests in an \c AND combination.

  In the \c OR combination, the result is \c Unconverged if \e all of
  the tests are \c Unconverged. Otherwise, it is the result of the \e
  first test in the list that is either \c Converged or \c
  Failed. Therefore, it will generally make sense to put the \c Failed
  -type tests at the end of the \c OR list.

  \note We call checkStatus on \e every convergence test, though some
  may be called with the NOX::StatusTest::None option.

  \author Tammy Kolda (SNL 8950) and Roger Pawlowski (SNL 1416)
*/
class Combo : public Generic {

public:

  /*!
    \brief The test can be either the AND of all the component tests,
    or the OR of all the component tests.
  */
  enum ComboType {
    //! Logically "AND" together the results of the tests in this combination
    AND,
    //! Logically "OR" together the results of the tests in this combination
    OR
  };

  //! Constructor.  Optional argument is the error stream for output.
  Combo(ComboType t, const NOX::Utils* u = NULL);

  //! Constructor with a single test.
  Combo(ComboType t, const Teuchos::RCP<Generic>& a,
    const NOX::Utils* u = NULL);

  //! Constructor with two tests.
  Combo(ComboType t, const Teuchos::RCP<Generic>& a,
    const Teuchos::RCP<Generic>& b,
    const NOX::Utils* u = NULL);

  //! Add another test to this combination.
  /*!
    Calls isSafe() to determine if it is safe to add \c a to the combination.
  */
  virtual Combo& addStatusTest(const Teuchos::RCP<Generic>& a);

  //! Destructor
  virtual ~Combo();

  /*!
    \brief Tests stopping criterion.

    See addOp() and orOp() for details.
  */
  virtual StatusType checkStatus(const NOX::Solver::Generic& problem,
                 NOX::StatusTest::CheckType checkType);

  virtual StatusType getStatus() const;

  virtual std::ostream& print(std::ostream& stream, int indent = 0) const;

protected:

  //! Use this for checkStatus when this is an OR type combo. Updates NOX::StatusTest::Combo::status.
  /*!
    If there is a combination of NOX::StatusTest::Failed and
    NOX::StatusTest::Converged in the tests that are OR'd together,
    the value of status for this test is set to the status of the
    first test it encounters which is not NOX::Status::Unconvered. The
    tests are evaluated in the order that they were added to the
    combination.

    \note We compute the status of all tests in the combination for
    the sake of completeness, even if we could determine the status of
    this combination test without that check.

  */
  virtual void orOp(const Solver::Generic& problem,
            NOX::StatusTest::CheckType checkType);

  //! Use this for checkStatus when this is an AND type combo. Updates NOX::StatusTest::Combo::status.
  /*!

    If any tests are NOX::StatusTest::Unconverged, then the status of
    this test is NOX::StatusTest::Unconverged.  If there is a
    combination of NOX::StatusTest::Failed and
    NOX::StatusTest::Converged in the tests that are AND'd together,
    the value of status for this test is set to the status of the
    first test it encounters.  The tests are evaluated in the
    order that they were added to the combination.

    \note We compute the status of all tests in the combination for
    the sake of completeness, even if we could determine the status of
    this combination test without that check.
  */
  virtual void andOp(const Solver::Generic& problem,
             NOX::StatusTest::CheckType checkType);

  /*! \brief Check whether or not it is safe to add \c a to this list
   of tests.

   This is necessary to avoid any infinite recursions
   (i.e., a test cannot own a copy of itself).
  */
  bool isSafe(Generic& a);

private:

  //! Type of test
  const ComboType type;

  //! Vector of generic status tests
  std::vector<Teuchos::RCP<Generic> > tests;

  //! %Status
  StatusType status;

  //! Ostream used to print errors
  NOX::Utils utils;

}; // class Combo

} // namespace Status
} // namespace NOX


#endif