artis-star/src/artis-star/common/observer/Iterator.hpp

/**
 * @file artis-star/common/observer/View.hpp
 * @author The ARTIS Development Team
 * See the AUTHORS or Authors.txt file
 */

/*
 * ARTIS - the multimodeling and simulation environment
 * This file is a part of the ARTIS environment
 *
 * Copyright (C) 2013-2019 ULCO http://www.univ-littoral.fr
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef ARTIS_COMMON_OBSERVER_ITERATOR_HPP
#define ARTIS_COMMON_OBSERVER_ITERATOR_HPP

#include <artis-star/common/observer/View.hpp>

namespace artis {
    namespace observer {

        template<typename Time>
        class Iterator {
        public:
            Iterator(const typename View<Time>::Values& view)
                    :_view(view), _iterator(view.begin()) { }

            virtual ~Iterator() = default;

            bool has_next() const { return _iterator != _view.end(); }

            virtual void operator++() { _iterator++; }

            virtual const std::pair<double, common::Value>& operator*() const { return *_iterator; }

        private:
            const typename View<Time>::Values& _view;
            typename View<Time>::Values::const_iterator _iterator;
        };

        template<typename Time>
        class DiscreteTimeIterator : public Iterator<Time> {
        public:
            DiscreteTimeIterator(const typename View<Time>::Values& view,
                    const typename Time::type& start, const typename Time::type& step)
                    :Iterator<Time>(view), _step(step), _time(start)
            {
                _last_value = &Iterator<Time>::operator*();
                while (Iterator<Time>::operator*().first <= start
                        and Iterator<Time>::has_next()) {
                    Iterator<Time>::operator++();
                    if (Iterator<Time>::operator*().first == start) {
                        _last_value = &Iterator<Time>::operator*();
                    }
                }
            }

            virtual ~DiscreteTimeIterator() = default;

            void operator++() override
            {
                _time += _step;
                _last_value = &Iterator<Time>::operator*();
                while (Iterator<Time>::operator*().first <= _time and Iterator<Time>::has_next()) {
                    Iterator<Time>::operator++();
                    if (Iterator<Time>::operator*().first == _time) {
                        _last_value = &Iterator<Time>::operator*();
                    }
                }
            }

            const std::pair<double, common::Value>& operator*() const override { return *_last_value; }

        private:
            typename Time::type _step;
            typename Time::type _time;
            const std::pair<double, common::Value>* _last_value;
        };

    }
}

#endif