include/dlvhex2/ModelBuilder.h

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/* dlvhex -- Answer-Set Programming with external interfaces.
 * Copyright (C) 2005-2007 Roman Schindlauer
 * Copyright (C) 2006-2015 Thomas Krennwallner
 * Copyright (C) 2009-2016 Peter Schüller
 * Copyright (C) 2011-2016 Christoph Redl
 * Copyright (C) 2015-2016 Tobias Kaminski
 * Copyright (C) 2015-2016 Antonius Weinzierl
 *
 * This file is part of dlvhex.
 *
 * dlvhex is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * dlvhex 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with dlvhex; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

#ifndef MODEL_BUILDER_HPP_INCLUDED__18012011
#define MODEL_BUILDER_HPP_INCLUDED__18012011

#include "dlvhex2/PlatformDefinitions.h"
#include "EvalGraph.h"
#include "ModelGraph.h"

DLVHEX_NAMESPACE_BEGIN

template<typename EvalGraphT>
struct ModelBuilderConfig
{
    ModelBuilderConfig(EvalGraphT& eg):
    eg(eg), redundancyElimination(true), constantSpace(false) {}
    EvalGraphT& eg;
    bool redundancyElimination;
    bool constantSpace;
};

template<typename EvalGraphT>
class ModelBuilder
{
    // types
    public:
        typedef ModelBuilder<EvalGraphT>
            Self;

        // concept check: EvalGraphT must be an eval graph
        BOOST_CONCEPT_ASSERT((boost::Convertible<
            EvalGraphT,
            EvalGraph<
            typename EvalGraphT::EvalUnitPropertyBase,
            typename EvalGraphT::EvalUnitDepPropertyBase> >));
        typedef EvalGraphT
            MyEvalGraph;
        typedef typename MyEvalGraph::EvalUnit
            EvalUnit;

        // concept check: eval graph must store model generator factory properties for units
        BOOST_CONCEPT_ASSERT((boost::Convertible<
            typename EvalGraphT::EvalUnitPropertyBundle,
            EvalUnitModelGeneratorFactoryProperties<
            typename EvalGraphT::EvalUnitPropertyBundle::Interpretation> >));
        typedef typename EvalGraphT::EvalUnitPropertyBundle
            EvalUnitPropertyBundle;
        // from eval unit properties we get the interpretation type
        typedef typename EvalUnitPropertyBundle::Interpretation
            Interpretation;
        typedef typename EvalUnitPropertyBundle::Interpretation::Ptr
            InterpretationPtr;

        struct ModelProperties
        {
            InterpretationPtr interpretation;

            // for input models only:

            bool dummy;
            bool childModelsGenerated;

            ModelProperties();
            std::ostream& print(std::ostream& o) const;
        };

        typedef ModelGraph<EvalGraphT, ModelProperties>
            MyModelGraph;
        typedef typename MyModelGraph::Model
            Model;
        typedef boost::optional<Model>
            OptionalModel;

        // members
    protected:
        EvalGraphT& eg;
        MyModelGraph mg;

        // methods
    public:
        ModelBuilder(ModelBuilderConfig<EvalGraphT>& cfg):
        eg(cfg.eg), mg(cfg.eg) {}
        virtual ~ModelBuilder() {}
        inline EvalGraphT& getEvalGraph() { return eg; }
        inline MyModelGraph& getModelGraph() { return mg; }

        virtual OptionalModel getNextIModel(EvalUnit u) = 0;

        virtual OptionalModel getNextOModel(EvalUnit u) = 0;

        // debugging methods
        virtual void printEvalGraphModelGraph(std::ostream& o) = 0;
        virtual void printModelBuildingPropertyMap(std::ostream& o) = 0;
};

// impl

template<typename EvalGraphT>
ModelBuilder<EvalGraphT>::ModelProperties::ModelProperties():
interpretation(),
dummy(false),
childModelsGenerated(false)
{
}


template<typename EvalGraphT>
std::ostream&
ModelBuilder<EvalGraphT>::ModelProperties::print(std::ostream& o) const
{
    if( dummy )
        o << "dummy ";
    if( childModelsGenerated )
        o << "childModelsGenerated ";
    o <<
        "interpretation=" << printptr(interpretation);
    if( interpretation )
        o << *interpretation;
    return o;
}


DLVHEX_NAMESPACE_END
#endif                           // MODEL_BUILDER_HPP_INCLUDED__18012011

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