Nektar::LibUtilities::NekFactory< tKey, tBase, > Class Template Reference

Provides a generic Factory class. More...

#include <NekFactory.hpp>

Collaboration diagram for Nektar::LibUtilities::NekFactory< tKey, tBase, >:

Classes
struct	ModuleEntry
	Define a struct to hold the information about a module. More...

Public Types
typedef std::string	tDescription
	Description datatype.
typedef std::less< tKey >	tPredicator
	Comparison predicator of key.
typedef boost::shared_ptr< tBase >	tBaseSharedPtr
	Shared pointer to an object of baseclass type.
typedef tBaseSharedPtr(*	CreatorFunction )(BOOST_PP_ENUM_PARAMS(MAX_PARAM, tParam))
	CreatorFunction type which takes parameter and returns base class shared pointer.
typedef std::map< tKey, ModuleEntry, tPredicator >	TMapFactory
	Factory map between key and module data.
typedef TMapFactory::iterator	TMapFactoryIterator
	Iterator for factory map.

Public Member Functions
	NekFactory ()
tBaseSharedPtr	CreateInstance (tKey idKey BOOST_PP_COMMA_IF(MAX_PARAM) BOOST_PP_ENUM_BINARY_PARAMS(MAX_PARAM, tParam, x))
	Create an instance of the class referred to by idKey.
tKey	RegisterCreatorFunction (tKey idKey, CreatorFunction classCreator, tDescription pDesc="")
	Register a class with the factory.
bool	ModuleExists (tKey idKey)
	Checks if a particular module is available.
void	PrintAvailableClasses (std::ostream &pOut=std::cout)
	Prints the available classes to stdout.
tKey	GetKey (tDescription pDesc)
	Retrieves a key, given a description.
std::string	GetClassDescription (tKey idKey)
	Returns the description of a class.

Protected Member Functions
TMapFactory *	getMapFactory ()
	Ensure the factory's map is created.

Private Member Functions
	NekFactory (const NekFactory &rhs)
NekFactory &	operator= (const NekFactory &rhs)

Private Attributes
TMapFactory	mMapFactory

Detailed Description

template<typename tKey, typename tBase, BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam)>
class Nektar::LibUtilities::NekFactory< tKey, tBase, >

Provides a generic Factory class.

Implements a generic object factory. Class-types which use a potentially arbitrary number of parameters may be used with specialised forms of the NekFactory. An upper limit on the number of parameters is imposed by the MAX_PARAM preprocessor definition in the NekFactory.hpp file. The specialisations are generated at compile type using Boost preprocessor by through repeated inclusion of the NekFactory.hpp file.

To allow a class to be instantiated by the factory, the following are required in each class definition (in the case of a single parameter):

static [baseclass]* create([paramtype1] &P) {
   return new [derivedclass](P);
}
static std::string className;

and outside the class definition in the implementation:

std::string [derivedclass]::className
   = Factory<std::string,[baseclass],[paramtype1]>::
       RegisterCreatorFunction("[derivedclass]",
                           [derivedclass]::create,"Description");

The assignment of the static variable className is done through the call to RegisterCreatorFunction, which registers the class with the factory prior to the start of the main() routine.

To create an instance of a derived class, for instance:

[baseclass]* var_name =
   Factory<std::string,[baseclass],[paramtype1]>
           ::CreateInstance("[derivedclass]",Param1);

Definition at line 112 of file NekFactory.hpp.

Member Typedef Documentation

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

typedef tBaseSharedPtr(* Nektar::LibUtilities::NekFactory< tKey, tBase, >::CreatorFunction)(BOOST_PP_ENUM_PARAMS(MAX_PARAM, tParam))

CreatorFunction type which takes parameter and returns base class shared pointer.

Definition at line 123 of file NekFactory.hpp.

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

typedef boost::shared_ptr<tBase> Nektar::LibUtilities::NekFactory< tKey, tBase, >::tBaseSharedPtr

Shared pointer to an object of baseclass type.

Definition at line 120 of file NekFactory.hpp.

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

typedef std::string Nektar::LibUtilities::NekFactory< tKey, tBase, >::tDescription

Description datatype.

Definition at line 116 of file NekFactory.hpp.

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

typedef std::map<tKey, ModuleEntry, tPredicator> Nektar::LibUtilities::NekFactory< tKey, tBase, >::TMapFactory

Factory map between key and module data.

Definition at line 141 of file NekFactory.hpp.

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

typedef TMapFactory::iterator Nektar::LibUtilities::NekFactory< tKey, tBase, >::TMapFactoryIterator

Iterator for factory map.

Definition at line 143 of file NekFactory.hpp.

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

typedef std::less<tKey> Nektar::LibUtilities::NekFactory< tKey, tBase, >::tPredicator

Comparison predicator of key.

Definition at line 118 of file NekFactory.hpp.

Constructor & Destructor Documentation

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

Nektar::LibUtilities::NekFactory< tKey, tBase, >::NekFactory ( )

inline

Definition at line 147 of file NekFactory.hpp.

{}

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

Nektar::LibUtilities::NekFactory< tKey, tBase, >::NekFactory ( const NekFactory< tKey, tBase, > &  rhs )

private

Member Function Documentation

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

tBaseSharedPtr Nektar::LibUtilities::NekFactory< tKey, tBase, >::CreateInstance ( tKey idKey   BOOST_PP_COMMA_IFMAX_PARAM) BOOST_PP_ENUM_BINARY_PARAMS(MAX_PARAM, tParam, x )

inline

Create an instance of the class referred to by idKey.

Searches the factory's map for the given key and returns a shared base class pointer to a new instance of the associated class.

Parameters

idKey	Key of class to create.
x	Parameter to pass to class constructor.

Returns

Base class pointer to new instance.

Definition at line 158 of file NekFactory.hpp.

References ASSERTL0, Nektar::LibUtilities::NekFactory< tKey, tBase, >::getMapFactory(), MAX_PARAM, and Nektar::LibUtilities::NekFactory< tKey, tBase, >::PrintAvailableClasses().

Referenced by Nektar::SolverUtils::Advection3DHomogeneous1D::Advection3DHomogeneous1D(), Nektar::LibUtilities::SessionReader::CreateComm(), Nektar::LinearisedAdvection::DFT(), Nektar::AdjointAdvection::DFT(), Nektar::SolverUtils::Diffusion3DHomogeneous1D::Diffusion3DHomogeneous1D(), Nektar::MultiRegions::GlobalLinSysIterative::DoConjugateGradient(), Nektar::VortexWaveInteraction::ExecuteRoll(), Nektar::VortexWaveInteraction::ExecuteStreak(), Nektar::VortexWaveInteraction::ExecuteWave(), Nektar::MultiRegions::ExpListHomogeneous1D::ExpListHomogeneous1D(), Nektar::MultiRegions::ExpListHomogeneous2D::ExpListHomogeneous2D(), Nektar::Utilities::InputTec::GenElement2D(), Nektar::Utilities::InputTec::GenElement3D(), Nektar::MultiRegions::ExpList::GenGlobalBndLinSys(), Nektar::MultiRegions::ExpList::GenGlobalLinSys(), Nektar::LibUtilities::Import(), main(), Nektar::LibUtilities::SessionReader::PartitionMesh(), Nektar::Utilities::InputFld::Process(), Nektar::Utilities::OutputInfo::Process(), Nektar::Utilities::Module::ReorderPrisms(), Nektar::PulseWavePropagation::SetPulseWaveBoundaryConditions(), Nektar::Stimulus::Stimulus(), Nektar::MultiRegions::GlobalLinSysIterativeStaticCond::v_AssembleSchurComplement(), Nektar::VelocityCorrectionScheme::v_InitObject(), Nektar::LinearSWE::v_InitObject(), Nektar::NonlinearSWE::v_InitObject(), Nektar::BidomainRoth::v_InitObject(), Nektar::Bidomain::v_InitObject(), Nektar::Monodomain::v_InitObject(), Nektar::PulseWavePropagation::v_InitObject(), Nektar::MultiRegions::PreconditionerLinearWithBlock::v_InitObject(), Nektar::MultiRegions::PreconditionerLinearWithLowEnergy::v_InitObject(), Nektar::MultiRegions::PreconditionerLinearWithDiag::v_InitObject(), Nektar::APE::v_InitObject(), Nektar::NonlinearPeregrine::v_InitObject(), Nektar::UnsteadyInviscidBurger::v_InitObject(), Nektar::UnsteadyAdvection::v_InitObject(), Nektar::SolverUtils::Driver::v_InitObject(), Nektar::IncNavierStokes::v_InitObject(), Nektar::CompressibleFlowSystem::v_InitObject(), Nektar::MultiRegions::GlobalLinSysIterativeStaticCond::v_InitObject(), Nektar::CoupledLinearNS::v_InitObject(), Nektar::SubSteppingExtrapolate::v_SubSteppingTimeIntegration(), Nektar::VortexWaveInteraction::VortexWaveInteraction(), and Nektar::LibUtilities::Write().

                {
                    // Now try and find the key in the map.
                    TMapFactoryIterator it = getMapFactory()->find(idKey);

                    // If successful, check the CreatorFunction is defined and
                    // create a new instance of the class.
                    if (it != getMapFactory()->end())
                    {
                        if (it->second.m_func)
                        {
                            try
                            {
                                return it->second.m_func(BOOST_PP_ENUM_PARAMS(MAX_PARAM, x));
                            }
                            catch (const std::string& s)
                            {
                                std::stringstream errstr;
                                errstr << "Unable to create module: " << idKey << "\n";
                                errstr << s;
                                ASSERTL0(false, errstr.str());
                            }
                        }
                    }

                    // If we get this far, the key doesn't exist, so throw an error.
                    std::stringstream errstr;
                    errstr << "No such module: " << idKey << std::endl;
                    PrintAvailableClasses(errstr);
                    ASSERTL0(false, errstr.str());
                    return tBaseSharedPtr();
                }

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

std::string Nektar::LibUtilities::NekFactory< tKey, tBase, >::GetClassDescription ( tKey  idKey )

inline

Returns the description of a class.

Definition at line 281 of file NekFactory.hpp.

References ASSERTL0, and Nektar::LibUtilities::NekFactory< tKey, tBase, >::getMapFactory().

                {
                    // Now try and find the key in the map.
                    TMapFactoryIterator it = getMapFactory()->find(idKey);

                    std::stringstream errstr;
                    errstr << "No such module: " << idKey << std::endl;
                    ASSERTL0 (it != getMapFactory()->end(), errstr.str());
                    return it->second.m_desc;
                }

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

tKey Nektar::LibUtilities::NekFactory< tKey, tBase, >::GetKey ( tDescription  pDesc )

inline

Retrieves a key, given a description.

Definition at line 261 of file NekFactory.hpp.

References ASSERTL0, and Nektar::LibUtilities::NekFactory< tKey, tBase, >::getMapFactory().

                {
                    TMapFactoryIterator it;
                    for (it = getMapFactory()->begin(); it != getMapFactory()->end(); ++it)
                    {
                        if (it->second.m_desc == pDesc)
                        {
                            return it->first;
                        }
                    }
                    std::string errstr = "Module '"
                            + boost::lexical_cast<std::string>(pDesc)
                            + "' is not known.";
                    ASSERTL0(false, errstr);
                }

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

TMapFactory* Nektar::LibUtilities::NekFactory< tKey, tBase, >::getMapFactory ( )

inlineprotected

Ensure the factory's map is created.

Returns

The factory's map.

Definition at line 297 of file NekFactory.hpp.

References Nektar::LibUtilities::NekFactory< tKey, tBase, >::mMapFactory.

Referenced by Nektar::LibUtilities::NekFactory< tKey, tBase, >::CreateInstance(), Nektar::LibUtilities::NekFactory< tKey, tBase, >::GetClassDescription(), Nektar::LibUtilities::NekFactory< tKey, tBase, >::GetKey(), Nektar::LibUtilities::NekFactory< tKey, tBase, >::ModuleExists(), Nektar::LibUtilities::NekFactory< tKey, tBase, >::PrintAvailableClasses(), and Nektar::LibUtilities::NekFactory< tKey, tBase, >::RegisterCreatorFunction().

                {
                    return &mMapFactory;
                }

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

bool Nektar::LibUtilities::NekFactory< tKey, tBase, >::ModuleExists ( tKey  idKey )

inline

Checks if a particular module is available.

Definition at line 217 of file NekFactory.hpp.

References Nektar::LibUtilities::NekFactory< tKey, tBase, >::getMapFactory().

Referenced by main().

                {
                    // Now try and find the key in the map.
                    TMapFactoryIterator it = getMapFactory()->find(idKey);

                    if (it != getMapFactory()->end())
                    {
                        return true;
                    }
                    return false;
                }

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

NekFactory& Nektar::LibUtilities::NekFactory< tKey, tBase, >::operator= ( const NekFactory< tKey, tBase, > &  rhs )

private

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

void Nektar::LibUtilities::NekFactory< tKey, tBase, >::PrintAvailableClasses ( std::ostream &  pOut = std::cout )

inline

Prints the available classes to stdout.

Definition at line 233 of file NekFactory.hpp.

References Nektar::LibUtilities::NekFactory< tKey, tBase, >::getMapFactory().

Referenced by Nektar::LibUtilities::NekFactory< tKey, tBase, >::CreateInstance(), and main().

                {
                    pOut << std::endl << "Available classes: " << std::endl;
                    TMapFactoryIterator it;
                    for (it = getMapFactory()->begin(); it != getMapFactory()->end(); ++it)
                    {
                        pOut << std::endl << "Available classes: " << std::endl;
                        TMapFactoryIterator it;
                        for (it = getMapFactory()->begin(); it != getMapFactory()->end(); ++it)
                        {
                            pOut << "  " << it->first;
                            if (it->second.m_desc != "")
                            {
                                pOut << ":" << std::endl << "    "
                                          << it->second.m_desc << std::endl;
                            }
                            else
                            {
                                pOut << std::endl;
                            }
                        }
                    }
                }

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

tKey Nektar::LibUtilities::NekFactory< tKey, tBase, >::RegisterCreatorFunction ( tKey  idKey, CreatorFunction  classCreator, tDescription  pDesc = ""  )

inline

Register a class with the factory.

This function is called by each class in a static context (prior to the execution of main()) and creates an entry for the class in the factory's map.

Parameters

idKey	Key used to reference the class.
classCreator	Function to call to create an instance of this class.
pDesc	Optional description of class.

Returns

The given key idKey.

Definition at line 205 of file NekFactory.hpp.

References Nektar::LibUtilities::NekFactory< tKey, tBase, >::getMapFactory().

                {
                    ModuleEntry e(classCreator, pDesc);
                    getMapFactory()->insert(std::pair<tKey,ModuleEntry>(idKey, e));
                    return idKey;
                }

Member Data Documentation

template<typename tKey , typename tBase , BOOST_PP_ENUM(MAX_PARAM, FACTORY_print, typename tParam) >

TMapFactory Nektar::LibUtilities::NekFactory< tKey, tBase, >::mMapFactory

private

Definition at line 306 of file NekFactory.hpp.

Referenced by Nektar::LibUtilities::NekFactory< tKey, tBase, >::getMapFactory().