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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
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// documentation and/or other materials provided with the distribution.
//
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// 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
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//@HEADER

#ifndef NOX_STATUS_MAXITERS_H
#define NOX_STATUS_MAXITERS_H

#include "NOX_StatusTest_Generic.H"    // base class
#include "NOX_Utils.H"                  // class data element

namespace NOX {

namespace StatusTest {

//! Failure test based on the maximum number of nonlinear solver iterations.
/*!
  Let \f$k\f$ denote the current number of iterations (accessed via
  NOX::Solver::getNumIterations) and \f$k_{\max}\f$ denote the
  tolerance set in the constructor of this status test.
  This test returns NOX::StatusTest::Failed if
  \f$
  k \geq k_{\rm max}.
  \f$
  Otherwise, it returns NOX::StatusTest::Unconverged.

  \note If checkStatus is called with the type set to
  NOX::StatusTest::None, it then the status is set to to
  NOX::Status::Unevaluated and returned. (Also #niters is set to -1.)
*/
class MaxIters : public Generic {

public:

  //! Constructor. Specify the maximum number of nonlinear solver iterations, \f$k_{\max}\f$ ands optinally an error stream for printing errors.
  MaxIters(int maxIterations, const NOX::Utils* u = NULL);

  //! Destructor.
  virtual ~MaxIters();

  virtual NOX::StatusTest::StatusType
  checkStatus(const NOX::Solver::Generic& problem,
          NOX::StatusTest::CheckType checkType);

  virtual NOX::StatusTest::StatusType getStatus() const;

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

  //! Returns the Maximum number of iterations set in the constructor.
  virtual int getMaxIters() const;

  /*!
    \brief Returns the current number of iterations taken by the solver.

    Returns -1 if the status of this test is NOX::StatusTest::Unevaluated.
   */
  virtual int getNumIters() const;

private:

  //! Maximum number of iterations
  int maxiters;

  //! Current number of iterations (if known)
  int niters;

  //! %Status
  NOX::StatusTest::StatusType status;

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

};

} // namespace Status
} // namespace NOX

#endif