EvtExternalGenFactory.cpp
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	/***********************************************************************
	* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
	* *
	* This file is part of EvtGen. *
	* *
	* EvtGen is free software: you can redistribute it and/or modify *
	* it under the terms of the GNU General Public License as published by *
	* the Free Software Foundation, either version 3 of the License, or *
	* (at your option) any later version. *
	* *
	* EvtGen is distributed in the hope that it will be useful, *
	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
	* GNU General Public License for more details. *
	* *
	* You should have received a copy of the GNU General Public License *
	* along with EvtGen. If not, see <https://www.gnu.org/licenses/>. *
	***********************************************************************/

	#include "EvtGenExternal/EvtExternalGenFactory.hh"

	#include "EvtGenBase/EvtPatches.hh"
	#include "EvtGenBase/EvtReport.hh"

	#ifdef EVTGEN_PYTHIA
	#include "EvtGenExternal/EvtPythiaEngine.hh"
	#endif

	#ifdef EVTGEN_PHOTOS
	#include "EvtGenExternal/EvtPhotosEngine.hh"
	#endif

	#ifdef EVTGEN_TAUOLA
	#include "EvtGenExternal/EvtTauolaEngine.hh"
	#endif

	#include <iostream>
	using std::endl;

	EvtExternalGenFactory::EvtExternalGenFactory()
	{
	_extGenMap.clear();
	}

	EvtExternalGenFactory::~EvtExternalGenFactory()
	{
	ExtGenMap::iterator iter;
	for ( iter = _extGenMap.begin(); iter != _extGenMap.end(); ++iter ) {
	EvtAbsExternalGen* theGenerator = iter->second;
	delete theGenerator;
	}

	_extGenMap.clear();
	}

	EvtExternalGenFactory* EvtExternalGenFactory::getInstance()
	{
	static EvtExternalGenFactory* theFactory = 0;

	if ( theFactory == 0 ) {
	theFactory = new EvtExternalGenFactory();
	}

	return theFactory;
	}

	// Only define the generator if we have the external ifdef variable set
	#ifdef EVTGEN_PYTHIA
	void EvtExternalGenFactory::definePythiaGenerator( std::string xmlDir,
	bool convertPhysCodes,
	bool useEvtGenRandom )
	{
	int genId = EvtExternalGenFactory::PythiaGenId;

	EvtGenReport( EVTGEN_INFO, "EvtGen" )
	<< "Defining EvtPythiaEngine: data tables defined in " << xmlDir << endl;
	if ( convertPhysCodes == true ) {
	EvtGenReport( EVTGEN_INFO, "EvtGen" )
	<< "Pythia 6 codes in decay files will be converted to Pythia 8 codes"
	<< endl;
	} else {
	EvtGenReport( EVTGEN_INFO, "EvtGen" )
	<< "Pythia 8 codes need to be used in decay files" << endl;
	}

	if ( useEvtGenRandom == true ) {
	EvtGenReport( EVTGEN_INFO, "EvtGen" )
	<< "Using EvtGen random engine for Pythia 8 as well" << endl;
	}

	EvtAbsExternalGen* pythiaGenerator =
	new EvtPythiaEngine( xmlDir, convertPhysCodes, useEvtGenRandom );
	_extGenMap[genId] = pythiaGenerator;
	}
	#else
	void EvtExternalGenFactory::definePythiaGenerator( std::string, bool, bool )
	{
	}
	#endif

	#ifdef EVTGEN_PHOTOS
	void EvtExternalGenFactory::definePhotosGenerator( std::string photonType,
	bool useEvtGenRandom )
	{
	int genId = EvtExternalGenFactory::PhotosGenId;

	EvtGenReport( EVTGEN_INFO, "EvtGen" )
	<< "Defining EvtPhotosEngine using photonType = " << photonType << endl;

	EvtAbsExternalGen* photosGenerator = new EvtPhotosEngine( photonType,
	useEvtGenRandom );
	_extGenMap[genId] = photosGenerator;
	}
	#else
	void EvtExternalGenFactory::definePhotosGenerator( std::string, bool )
	{
	}
	#endif

	#ifdef EVTGEN_TAUOLA
	void EvtExternalGenFactory::defineTauolaGenerator( bool useEvtGenRandom )
	{
	int genId = EvtExternalGenFactory::TauolaGenId;

	EvtGenReport( EVTGEN_INFO, "EvtGen" ) << "Defining EvtTauolaEngine." << endl;

	EvtAbsExternalGen* tauolaGenerator = new EvtTauolaEngine( useEvtGenRandom );
	_extGenMap[genId] = tauolaGenerator;
	}
	#else
	void EvtExternalGenFactory::defineTauolaGenerator( bool )
	{
	}
	#endif

	EvtAbsExternalGen* EvtExternalGenFactory::getGenerator( int genId )
	{
	EvtAbsExternalGen* theGenerator( 0 );

	ExtGenMap::iterator iter;

	if ( ( iter = _extGenMap.find( genId ) ) != _extGenMap.end() ) {
	// Retrieve the external generator engine
	theGenerator = iter->second;

	} else {
	EvtGenReport( EVTGEN_INFO, "EvtGen" )
	<< "EvtAbsExternalGen::getGenerator: could not find generator for genId = "
	<< genId << endl;
	}

	return theGenerator;
	}

	void EvtExternalGenFactory::initialiseAllGenerators()
	{
	ExtGenMap::iterator iter;
	for ( iter = _extGenMap.begin(); iter != _extGenMap.end(); ++iter ) {
	EvtAbsExternalGen* theGenerator = iter->second;
	if ( theGenerator != 0 ) {
	theGenerator->initialise();
	}
	}
	}

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