include/dlvhex2/PlainModelGenerator.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 PLAIN_MODEL_GENERATOR_HPP_INCLUDED__09112010
#define PLAIN_MODEL_GENERATOR_HPP_INCLUDED__09112010

#include "dlvhex2/PlatformDefinitions.h"
#include "dlvhex2/fwd.h"
#include "dlvhex2/ID.h"
#include "dlvhex2/BaseModelGenerator.h"
#include "dlvhex2/ComponentGraph.h"

DLVHEX_NAMESPACE_BEGIN

class PlainModelGeneratorFactory;

//
// A model generator does the following:
// * it is constructed by a ModelGeneratorFactory which knows the program
//   (and can precompute information for evaluation,
//    and may also provide this to the model generator)
// * it is evaluated on a (probably empty) input interpretation
// * this evaluation can be performed online
// * evaluation yields a (probably empty) set of output interpretations
//

class PlainModelGenerator:
public BaseModelGenerator,
public ostream_printable<PlainModelGenerator>
{
    // types
    public:
        typedef PlainModelGeneratorFactory Factory;

        // storage
    protected:
        Factory& factory;

        InterpretationConstPtr postprocessedInput;
        ASPSolverManager::ResultsPtr currentResults;

        // members
    public:
        PlainModelGenerator(Factory& factory, InterpretationConstPtr input);

        virtual ~PlainModelGenerator() {}

        // generate and return next model, return null after last model
        virtual InterpretationPtr generateNextModel();
};

class PlainModelGeneratorFactory:
public BaseModelGeneratorFactory,
public ostream_printable<PlainModelGeneratorFactory>
{
    // types
    public:
        friend class PlainModelGenerator;
        typedef ComponentGraph::ComponentInfo ComponentInfo;

        // storage
    protected:
        ASPSolverManager::SoftwareConfigurationPtr externalEvalConfig;
        ProgramCtx& ctx;
        std::vector<ID> eatoms;
        std::vector<ID> idb;
        std::vector<ID> xidb;

        // methods
    public:
        PlainModelGeneratorFactory(
            ProgramCtx& ctx, const ComponentInfo& ci,
            ASPSolverManager::SoftwareConfigurationPtr externalEvalConfig);
        virtual ~PlainModelGeneratorFactory() {}

        virtual ModelGeneratorPtr createModelGenerator(
            InterpretationConstPtr input)
            { return ModelGeneratorPtr(new PlainModelGenerator(*this, input)); }

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

DLVHEX_NAMESPACE_END
#endif                           // PLAIN_MODEL_GENERATOR_HPP_INCLUDED__09112010

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