include/dlvhex2/NogoodGrounder.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 NOGOODGROUNDER_HPP_
#define NOGOODGROUNDER_HPP_

#include "dlvhex2/PlatformDefinitions.h"
#include "dlvhex2/fwd.h"
#include "dlvhex2/ID.h"
#include "dlvhex2/Nogood.h"
#include "dlvhex2/Registry.h"
#include "dlvhex2/AnnotatedGroundProgram.h"

#include <boost/unordered_map.hpp>
#include <boost/shared_ptr.hpp>

DLVHEX_NAMESPACE_BEGIN

class DLVHEX_EXPORT NogoodGrounder
{
    protected:
        RegistryPtr reg;
        SimpleNogoodContainerPtr watched;
        SimpleNogoodContainerPtr destination;
        AnnotatedGroundProgram& agp;
    public:
        NogoodGrounder(RegistryPtr reg, SimpleNogoodContainerPtr watched, SimpleNogoodContainerPtr destination, AnnotatedGroundProgram& agp);

        virtual void update(InterpretationConstPtr partialInterpretation = InterpretationConstPtr(), InterpretationConstPtr factWasSet = InterpretationConstPtr(), InterpretationConstPtr changed = InterpretationConstPtr()) = 0;

        virtual void resetWatched(SimpleNogoodContainerPtr watched);

        typedef boost::shared_ptr<NogoodGrounder> Ptr;
};

typedef NogoodGrounder::Ptr NogoodGrounderPtr;

class DLVHEX_EXPORT ImmediateNogoodGrounder : public NogoodGrounder
{
    private:
        int instantiatedNongroundNogoodsIndex;
    public:
        ImmediateNogoodGrounder(RegistryPtr reg, SimpleNogoodContainerPtr watched, SimpleNogoodContainerPtr destination, AnnotatedGroundProgram& agp);
        virtual void update(InterpretationConstPtr partialInterpretation = InterpretationConstPtr(), InterpretationConstPtr factWasSet = InterpretationConstPtr(), InterpretationConstPtr changed = InterpretationConstPtr());
        virtual void resetWatched(SimpleNogoodContainerPtr watched);
};

class DLVHEX_EXPORT LazyNogoodGrounder : public NogoodGrounder
{
    private:
        int watchedNogoodsCount;
        std::vector<std::pair<ID, int> > watchedLiterals;
        std::set<std::pair<IDAddress, int> > alreadyCompared;
    public:
        LazyNogoodGrounder(RegistryPtr reg, SimpleNogoodContainerPtr watched, SimpleNogoodContainerPtr destination, AnnotatedGroundProgram& agp);
        virtual void update(InterpretationConstPtr partialInterpretation = InterpretationConstPtr(), InterpretationConstPtr factWasSet = InterpretationConstPtr(), InterpretationConstPtr changed = InterpretationConstPtr());
        virtual void resetWatched(SimpleNogoodContainerPtr watched);
};

DLVHEX_NAMESPACE_END
#endif

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