artis/src/artis/observer/View.hpp

/**
 * @file artis/observer/View.hpp
 * @author See the AUTHORS file
 */

/*
 * Copyright (C) 2012-2019 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_OBSERVER_VIEW_HPP
#define ARTIS_OBSERVER_VIEW_HPP

#include <artis/kernel/AbstractModel.hpp>
#include <artis/utils/DoubleTime.hpp>

#include <boost/lexical_cast.hpp>

namespace artis {
    namespace observer {

        template<typename U, typename V>
        class View {
            typedef std::vector<unsigned int> Selector;

        public:
            typedef std::vector<std::pair<double, std::string> > Value;
            typedef std::map<std::string, Value> Values;

            View()
                    :_model(0) { }

            virtual ~View() { }

            void attachModel(const artis::kernel::AbstractModel<U, V>* m) { _model = m; }

            double begin() const
            {
                double t = utils::DoubleTime::infinity;

                for (Values::const_iterator it = _values.begin(); it != _values.end();
                     ++it) {
                    if (t > it->second.begin()->first) {
                        t = it->second.begin()->first;
                    }
                }
                return t;
            }

            View* clone() const
            {
                View* v = new View();

                v->_selectors = _selectors;
                for (Values::const_iterator it = _values.begin(); it != _values.end();
                     ++it) {

                    v->_values[it->first] = Value();
                    Value::const_iterator itp = it->second.begin();

                    while (itp != it->second.end()) {
                        v->_values[it->first].push_back(*itp);
                        ++itp;
                    }
                }
                v->_model = 0;
                return v;
            }

            double end() const
            {
                double t = 0;

                for (Values::const_iterator it = _values.begin(); it != _values.end();
                     ++it) {
                    if (t < it->second.back().first) {
                        t = it->second.back().first;
                    }
                }
                return t;
            }

            double get(double t, const std::string& name) const
            {
                Values::const_iterator it = _values.find(name);

                if (it != _values.end()) {
                    Value::const_iterator itp = it->second.begin();

                    while (itp != it->second.end() and itp->first < t) {
                        ++itp;
                    }
                    if (itp != it->second.end()) {
                        // TODO: to improve
                        return boost::lexical_cast<double>(itp->second);
                    } else {
                        return 0;
                    }
                }
                return 0;
            }

            const Value& get(const std::string& name) const
            {
                Values::const_iterator it = _values.find(name);

                if (it != _values.end()) {
                    return it->second;
                } else {
                    assert(false);
                }
            }

            virtual void observe(double time)
            {
                for (typename Selectors::const_iterator it = _selectors.begin();
                     it != _selectors.end(); ++it) {
                    const kernel::Node<utils::DoubleTime>* model = _model;

                    if (it->second.second.size() > 1) {
                        size_t i = 0;

                        while (i < it->second.second.size() - 1 and model) {
                            model = model->get_submodel(it->second.second[i]);
                            ++i;
                        }
                    }
                    if (model) {
                        _values[it->first].push_back(
                                std::make_pair(time,
                                        model->get(it->second.first, time,
                                                it->second.second.back())));
                    }
                }
            }

            void selector(const std::string& name, kernel::ValueTypeID value_type,
                    const Selector& chain)
            {
                _selectors[name] = std::make_pair(value_type, chain);
                _values[name] = Value();
            }

            const Values& values() const { return _values; }

        private:
            typedef std::map<std::string, std::pair<kernel::ValueTypeID,
                    Selector> > Selectors;

            Selectors _selectors;
            Values _values;
            const artis::kernel::AbstractModel<U, V>* _model;
        };

    }
}

#endif