/*
 *            Copyright 2009-2017 The VOTCA Development Team
 *                       (http://www.votca.org)
 *
 *      Licensed under the Apache License, Version 2.0 (the "License")
 *
 * You may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *              http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef VOTCA_XTP_EXTRACTORFACTORY_H
#define	VOTCA_XTP_EXTRACTORFACTORY_H

#include <map>
#include <votca/tools/objectfactory.h>
#include <votca/xtp/qmcalculator.h>

namespace votca { namespace xtp {



class ExtractorFactory
: public tools::ObjectFactory< std::string, QMCalculator >
{
private:
    ExtractorFactory() {}
public:
    
    static void RegisterAll(void);
    
    /**
       Create an instance of the object identified by key.
    *  Overwritten to load calculator defaults
    */
    QMCalculator *Create(const std::string &key);

    friend ExtractorFactory &Extractors();
    
};

inline ExtractorFactory &Extractors()
{
    static ExtractorFactory _instance;
    return _instance;
}

inline QMCalculator* ExtractorFactory::Create(const std::string &key)
{
    assoc_map::const_iterator it(getObjects().find(key));
    if (it != getObjects().end()) {
        QMCalculator* calc = (it->second)();
        // calc->LoadDefaults();
        return calc;
    } else
        throw std::runtime_error("factory key " + key + " not found.");
}

}}

#endif	// VOTCA_XTP_EXTRACTORFACTORY_H