delayedparameter.hh

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/* -*- mia-c++  -*-
 *
 * This file is part of MIA - a toolbox for medical image analysis 
 * Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
 *
 * MIA 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.
 *
 * This program 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 MIA; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef mia_core_delayedparameter_hh
#define mia_core_delayedparameter_hh

#include <string>
#include <stdexcept>


#include <mia/core/defines.hh>
#include <mia/core/datapool.hh>
#include <mia/core/errormacro.hh>

NS_MIA_BEGIN


template <typename T>
class TDelayedParameter {
public: 

        TDelayedParameter() = default; 

        TDelayedParameter(const std::string& key); 
        
        const T get() const; 

        bool pool_has_key() const; 

        bool key_is_valid() const; 

        const std::string& get_key() const;
private:
        std::string m_key;
}; 


template <typename T>
TDelayedParameter<T>::TDelayedParameter(const std::string& key):
        m_key(key)
{
}
        

template <typename T>
const T TDelayedParameter<T>::get() const
{
        if (!(CDatapool::instance().has_key(m_key))) {
                throw create_exception<std::invalid_argument>("TDelayedParameter::get(): Key '", m_key, 
                                                    "' is not available in the data pool");  
        }
        return boost::any_cast<T>(CDatapool::instance().get(m_key)); 
}

template <typename T>
bool TDelayedParameter<T>::pool_has_key() const
{
        return CDatapool::instance().has_key(m_key); 
}


template <typename T>
bool TDelayedParameter<T>::key_is_valid() const
{
        return !m_key.empty(); 
}

template <typename T>
const std::string& TDelayedParameter<T>::get_key() const
{
        return m_key; 
}

NS_MIA_END

#endif