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/*
// @HEADER
// 
// ***********************************************************************
// 
//      Teko: A package for block and physics based preconditioning
//                  Copyright 2010 Sandia Corporation 
//  
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//  
// 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 Eric C. Cyr (eccyr@sandia.gov)
// 
// ***********************************************************************
// 
// @HEADER

*/

#ifndef __Teko_CloneFactory_hpp__
#define __Teko_CloneFactory_hpp__

#include "Teuchos_RCP.hpp"

namespace Teko {

/** Base class for cloneable objects */
class Cloneable {
public:
   virtual ~Cloneable() {}

   /** Function that clones this object.  This
     * is not neccessarily a copy, but it is an
     * object of the same dynamic type.
     *
     * \returns A pointer to an object of the same
     *          type is returned
     */
   virtual Teuchos::RCP<Cloneable> clone() const = 0;
};

/** Class that simply prevents the autoclone object
  * from uneccessarily calling a constructor.
  */
class AutoCloneDummy {};

/** Class that provides an easy way to create a cloneable
  * class. All that is required is that the user implements
  * a default constructor. This also serves as a model for
  * creating other AutoClone-like interfaces. 
  *
  * The template parameter <code>CloneType</code> describes
  * the type of cloned object to returned. An object returned
  * from <code>AutoClone::clone</code> will be typed as
  * <code>CloneType</code>. The <code>BaseType</code> is the
  * parent type of the cloned object created. It is included,
  * with default <code>AutoCloneDummy</code>, so that no
  * instantiaions of <code>CloneType</code> are unnecessarily
  * created.
  *
  * \note Use of this class assumes the CloneType and BaseType 
  *       classes have a default constructor and does not
  *       override the clone method.
  */
template <class CloneType,class BaseType=AutoCloneDummy>
class AutoClone : public Cloneable, public BaseType {
public:
   virtual ~AutoClone() {}

   /** Simple default constructor, calls the default
     * constructor of BaseType 
     */
   AutoClone() 
      : BaseType()
   { }
   
   /** Function that clones this object.  This
     * is not neccessarily a copy, but it is an
     * object of the same dynamic type.
     *
     * \returns A pointer to an object of the same
     *          type is returned
     */
   virtual Teuchos::RCP<Cloneable> clone() const
   { return Teuchos::rcp(new AutoClone<CloneType,CloneType>()); }

private:
   // hidden
   AutoClone(const AutoClone<BaseType> & );
};

/** This class eases the construction of clone factories.  
  * It takes any Cloneable object and associates it with
  * a string. It will then perform the dynamic cast to
  * whatever type the user specifies using the CloneBaseType
  * template parameter. 
  *
  * \note A word of warning. This class does not provide compile
  *       time type safety. 
  */
template <class CloneBaseType>
class CloneFactory {
public:
   //! Default constructor
   CloneFactory() {}

   //! Copy constructor
   CloneFactory(const CloneFactory<CloneBaseType> & cf) : parentClones_(cf.parentClones_) {}

   virtual ~CloneFactory() {}

   /** Build a clone of the object associated with the string. This
     * object is automatically cast to the desired base type. This will
     * permit the easy use of the AutoClone class. 
     *
     * \note This method will throw an exception if the clone is not the right
     *       type (i.e. the dynamic cast to CloneBaseType fails). Also, this method
     *       returns null if the clone associated with the string can't be
     *       found.
     *
     * \param[in] str String associated with object to build.
     *
     * \returns A cloned object, correctly casted to CloneBaseType. If the
     *          string cannot be found then null is returned.
     */
   virtual Teuchos::RCP<CloneBaseType> build(const std::string & str) const
   { 
      std::map<std::string,Teuchos::RCP<const Cloneable> >::const_iterator itr 
            = parentClones_.find(str);
      if(itr==parentClones_.end()) return Teuchos::null;
      return Teuchos::rcp_dynamic_cast<CloneBaseType>(itr->second->clone(),true); 
   }

   /** Add a string associated clone to the factory. This object can be used
     * later to build a clone of itself. If this method is called twice with
     * the same string, the later clone will be maintained.
     *
     * \note The object to be cloned is stored until the CloneFactory is destroyed.
     *
     * \param[in] str String associated with this object.
     * \param[in] clone Object to be cloned.
     */
   virtual void addClone(const std::string & str,const Teuchos::RCP<Cloneable> & clone)
   { parentClones_[str] = clone; }

   //! Return the number of clones stored in this factory
   virtual int cloneCount() const
   { return parentClones_.size(); }

   /** Get the label for all clones in this <code>CloneFactory</code>.
     *
     * \param[in,out] names Destination vector for the the clone names
     */
   void getCloneNames(std::vector<std::string> & names) const
   {
      std::map<std::string,Teuchos::RCP<const Cloneable> >::const_iterator itr;
      for(itr=parentClones_.begin();itr!=parentClones_.end();++itr)
         names.push_back(itr->first);
   }

protected:
   //! stores the clonable objects
   std::map<std::string,Teuchos::RCP<const Cloneable> > parentClones_;
};

}

#endif