PredicateConverterList.h

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/* ============================================================
 *
 * This file is part of the RSB project
 *
 * Copyright (C) 2011 Jan Moringen <jmoringe@techfak.uni-bielefeld.de>
 *
 * This file may be licensed under the terms of the
 * GNU Lesser General Public License Version 3 (the ``LGPL''),
 * or (at your option) any later version.
 *
 * Software distributed under the License is distributed
 * on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
 * express or implied. See the LGPL for the specific language
 * governing rights and limitations.
 *
 * You should have received a copy of the LGPL along with this
 * program. If not, go to http://www.gnu.org/licenses/lgpl.html
 * or write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The development of this software was supported by:
 *   CoR-Lab, Research Institute for Cognition and Robotics
 *     Bielefeld University
 *
 * ============================================================ */

#pragma once

#include <algorithm>
#include <iterator>

#include <boost/shared_ptr.hpp>

#include "ConverterSelectionStrategy.h"

namespace rsb {
namespace converter {

class ConverterPredicate: public rsc::runtime::Printable {
public:
    virtual ~ConverterPredicate() {
    }

    virtual bool match(const std::string& key) const = 0;
};

typedef boost::shared_ptr<ConverterPredicate> ConverterPredicatePtr;

class AlwaysApplicable: public ConverterPredicate {
public:
    bool match(const std::string& /*key*/) const {
        return true;
    }

    std::string getClassName() const {
        return "AlwaysApplicable";
    }

    void printContents(std::ostream& /*stream*/) const {
    }
};

template <typename WireType>
class PredicateConverterList: public ConverterSelectionStrategy<WireType> {
public:
    typedef typename ConverterSelectionStrategy<WireType>::ConverterPtr ConverterPtr;
    typedef std::list< std::pair<ConverterPredicatePtr, ConverterPtr> > ConverterList;

    template <typename ForwardIterator>
    PredicateConverterList(ForwardIterator begin, ForwardIterator end) {
        std::copy(begin, end, std::inserter(this->converters,
                                            this->converters.begin()));
    }

    ConverterPtr getConverter(const std::string& key) const {
        for (typename ConverterList::const_iterator it = this->converters.begin();
             it != this->converters.end(); ++it) {
            if (it->first->match(key)) {
                return it->second;
            }
        }
        return ConverterPtr();
    }

    std::string getClassName() const {
        return "PredicateConverterList";
    }

    void printContents(std::ostream& stream) const {
        stream << "converters = " << this->converters;
    }
private:
    ConverterList converters;
};

}
}