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// @HEADER
// ***********************************************************************
//
//                    Teuchos: Common Tools Package
//                 Copyright (2004) 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
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// 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 Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
// @HEADER


#ifndef TEUCHOS_PARAMETER_ENTRY_H
#define TEUCHOS_PARAMETER_ENTRY_H

/*! \file Teuchos_ParameterEntry.hpp
    \brief Object held as the "value" in the Teuchos::ParameterList std::map.
*/

#include "Teuchos_ConfigDefs.hpp"
#include "Teuchos_any.hpp"
#include "Teuchos_RCP.hpp"
#include "Teuchos_ParameterEntryValidator.hpp"

namespace Teuchos {

#ifndef DOXYGEN_SHOULD_SKIP_THIS
class ParameterList; // another parameter type (forward declaration)
#endif

/*! \brief This object is held as the "value" in the Teuchos::ParameterList std::map.

    This structure holds a \c Teuchos::any value and information on the status of this
    parameter (isUsed, isDefault, etc.).  The type of parameter is chosen through the
    templated Set/Get methods.
*/
class TEUCHOSPARAMETERLIST_LIB_DLL_EXPORT ParameterEntry {

public:

  /** \name Public types */
  //@{
  
  /** \brief . */
  typedef unsigned int ParameterEntryID;
  
  //@}

  //! @name Constructors/Destructor 
  //@{

  //! Default Constructor
  ParameterEntry();
  
  //! Copy constructor
  ParameterEntry(const ParameterEntry& source);

  //! Templated constructor
  template<typename T>
  explicit ParameterEntry(
    T value, bool isDefault = false, bool isList = false,
    const std::string &docString = "",
    RCP<const ParameterEntryValidator> const& validator = null
    );

  //@}

  //! @name Set Methods 
  //@{

  //! Replace the current parameter entry with \c source.
  ParameterEntry& operator=(const ParameterEntry& source);

  /*! \brief Templated set method that uses the input value type to determine the type of parameter.  
      
      \note <ul>
	    <li> Invalidates any previous values stored by this object although it doesn't necessarily erase them.  
            <li> Resets 'isUsed' functionality.  
	    </ul>
  */
  template<typename T>
  void setValue(
    T value, bool isDefault = false,
    const std::string &docString = "",
    RCP<const ParameterEntryValidator> const& validator = null
    );

  /*! \brief Set the value as an any object.
  *
  * This wipes all other data including documentation strings.
  *
  * Warning! Do not use function ths to set a sublist!
  */
  void setAnyValue(
    const any &value, bool isDefault = false
    );

  /*! \brief Set the validator. */
  void setValidator(
    RCP<const ParameterEntryValidator> const& validator
    );

  /*! \brief Set the documentation std::string. */
  void setDocString(const std::string &docString);

  //! Create a parameter entry that is an empty list.
  ParameterList& setList(
    bool isDefault = false,
    const std::string &docString = ""
    );

  //@}

  //! @name Get Methods 
  //@{
   
  /*! \brief Templated get method that uses the input pointer type to determine the type of parameter to return.  

      \note This method will cast the value to the type requested.  If that type is incorrect, 
	    an std::exception will be thrown by the any_cast.
  */
  template<typename T>
  inline
  T& getValue(T *ptr) const;

  /*! \brief Direct access to the Teuchos::any data value underlying this
   *  object. The bool argument \c activeQry (default: true) indicates that the 
   *  call to getAny() will set the isUsed() value of the ParameterEntry to true.
   */
  inline
  any& getAny(bool activeQry = true);

  /*! \brief Constant direct access to the Teuchos::any data value underlying this
   *  object. The bool argument \c activeQry (default: true) indicates that the 
   *  call to getAny() will set the isUsed() value of the ParameterEntry to true.
   */
  inline
  const any& getAny(bool activeQry = true) const;

  //@}

  //! @name Attribute/Query Methods 
  //@{
  
  //! Return whether or not the value has been used; i.e., whether or not the value has been retrieved via a get function.
  inline
  bool isUsed() const;

  //! Return whether or not the value itself is a list.
  bool isList() const;
  
  //! Test the type of the data being contained.
  template <typename T>
  inline
  bool isType() const;

  //! Test if the type of data being contained is a Teuchos::Array.
  bool isArray() const;
  //
  //! Test if the type of data being contained is a Teuchos::TwoDArray.
  bool isTwoDArray() const;

  //! Indicate whether this entry takes on the default value.
  inline
  bool isDefault() const;

  //! Return the (optional) documentation std::string
  inline
  std::string docString() const;

  //! Return the (optional) validator object
  inline
  RCP<const ParameterEntryValidator> validator() const;

  //@}

  //! @name I/O Methods 
  //@{
  /*! \brief Output a non-list parameter to the given output stream.  

      The parameter is followed by "[default]" if it is the default value given through a 
      Set method.  Otherwise, if the parameter was unused (not accessed through a Get method), 
      it will be followed by "[unused]".  This function is called by the "std::ostream& operator<<". 
  */
  std::ostream& leftshift(std::ostream& os, bool printFlags = true) const;

  /*! \brief Get the string that should be used as the tag name for all parameters when they are serialized
   * to xml.
   */
  static const std::string& getTagName(){
      static const std::string tagName = "Parameter";
      return tagName;
  }
  
  //@}
  
private:

  //! Reset the entry
  void reset();
  
  //! Templated Datatype
  any val_;

  //! Has this parameter been accessed by a "get" function?
  mutable bool isUsed_;

  //! Was this parameter a default value assigned by a "get" function?
  mutable bool isDefault_;

  //! Optional documentation field
  std::string  docString_;

  //! Optional validator object
//use pragmas to disable some false positive warnings for windows sharedlib export
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4251)
#endif
  RCP<const ParameterEntryValidator> validator_;
#ifdef _MSC_VER
#pragma warning(pop)
#endif

};

/*! \relates ParameterEntry 
    \brief A templated helper function for returning the value of type \c T held in the ParameterEntry object,
    where the type \c T can be specified in the call.  This is an easier way to call the getValue method
    in the ParameterEntry class, since the user does not have to pass in a pointer of type \c T.
*/
template<typename T>
inline T& getValue( const ParameterEntry &entry )
{
  return entry.getValue(static_cast<T*>(0));
}

/*! \relates ParameterEntry 
    \brief A templated helper function for returning the value of type \c T held in the ParameterEntry object,
    where the type \c T can be specified in the call.  This is an easier way to call the getValue method
    in the ParameterEntry class, since the user does not have to pass in a pointer of type \c T.
*/
template<typename T>
inline T& getValue(RCP<const ParameterEntry> entry)
{
  return entry->getValue(static_cast<T*>(0));
}

/*! \relates ParameterEntry 
    \brief Returns true if two ParameterEntry objects are equal.
*/
inline bool operator==(const ParameterEntry& e1, const ParameterEntry& e2) 
{ 
  return (
    e1.getAny() == e2.getAny()
    && e1.isList()== e2.isList()
    && e1.isUsed() == e2.isUsed()
    && e1.isDefault() == e2.isDefault()
    );
}

/*! \relates ParameterEntry 
    \brief Returns true if two ParameterEntry objects are <b>not</b> equal.
*/
inline bool operator!=(const ParameterEntry& e1, const ParameterEntry& e2) 
{ 
  return !( e1 == e2 );
}

/*! \relates ParameterEntry 
    \brief Output stream operator for handling the printing of parameter entries.  
*/
inline std::ostream& operator<<(std::ostream& os, const ParameterEntry& e) 
{ 
  return e.leftshift(os);
}

// ///////////////////////////////////////////
// Inline and Template Function Definitions

// Constructor/Destructor

template<typename T>
inline
ParameterEntry::ParameterEntry(
  T value_in,
  bool isDefault_in,
  bool /*isList_in*/, // 2007/11/26: rabartl: ToDo: This arg is ignored and should be removed!
  const std::string &docString_in,
  RCP<const ParameterEntryValidator> const& validator_in
  )
  : val_(value_in),
    isUsed_(false),
    isDefault_(isDefault_in),
    docString_(docString_in),
    validator_(validator_in)
{}

// Set Methods

template<typename T>
inline
void ParameterEntry::setValue(
  T value_in, bool isDefault_in, const std::string &docString_in,
  RCP<const ParameterEntryValidator> const& validator_in
  )
{
  val_ = value_in;
  isDefault_ = isDefault_in;
  if(docString_in.length())
    docString_ = docString_in;
  if(validator_in.get())
    validator_ = validator_in;
}

// Get Methods

template<typename T>
inline
T& ParameterEntry::getValue(T * /*ptr*/) const
{
  isUsed_ = true;
  return const_cast<T&>(Teuchos::any_cast<T>( val_ ));
}

inline
any& ParameterEntry::getAny(bool activeQry)
{ 
  if (activeQry == true) {
    isUsed_ = true;
  }
  return val_; 
}

inline
const any& ParameterEntry::getAny(bool activeQry) const
{ 
  if (activeQry == true) {
    isUsed_ = true;
  }
  return val_; 
}

// Attribute Methods

inline
bool ParameterEntry::isUsed() const
{ return isUsed_; }

template <typename T>
inline
bool ParameterEntry::isType() const
{ return val_.type() == typeid(T); }

inline
bool ParameterEntry::isDefault() const
{ return isDefault_; }

inline
std::string ParameterEntry::docString() const
{ return docString_; }

inline
RCP<const ParameterEntryValidator>
ParameterEntry::validator() const
{ return validator_; }


} // namespace Teuchos


#endif