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/* This file is part of the FaCT++ DL reasoner
Copyright (C) 2003-2015 Dmitry Tsarkov and The University of Manchester
Copyright (C) 2015-2016 Dmitry Tsarkov
This library 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.
This library 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 this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef MODELCACHESINGLETON_H
#define MODELCACHESINGLETON_H
#include "modelCacheConst.h"
#include "BiPointer.h"
/** Model caching implementation for singleton models.
Such models contains only one [negated] concept in completion tree.
Reduced set of operations, but very efficient.
*/
class modelCacheSingleton: public modelCacheInterface
{
protected: // members
/// the singleton itself
BipolarPointer Singleton;
protected: // methods
/// log a particular implementation of a cache entry
virtual void logCacheEntryImpl ( void ) const { LL << "\nSingleton cache: element " << getValue(); }
public: // interface
/// c'tor: no nominals can be here
modelCacheSingleton ( BipolarPointer bp )
: modelCacheInterface(/*flagNominals=*/false)
, Singleton(bp)
{}
/// copy c'tor
modelCacheSingleton ( const modelCacheSingleton& m )
: modelCacheInterface(m.hasNominalNode)
, Singleton(m.Singleton)
{}
/// empty d'tor
virtual ~modelCacheSingleton ( void ) {}
/// Check if the model contains clash
virtual modelCacheState getState ( void ) const { return csValid; }
/// access to internal value
BipolarPointer getValue ( void ) const { return Singleton; }
// mergable part
/// check whether two caches can be merged; @return state of "merged" model
modelCacheState canMerge ( const modelCacheInterface* p ) const
{
switch ( p->getCacheType() )
{
case mctConst: // TOP/BOTTOM: the current node can't add anything to the result
return p->getState();
case mctSingleton: // it can be a clash
return static_cast<const modelCacheSingleton*>(p)->getValue()
== inverse(getValue()) ? csInvalid : csValid;
case mctIan: // ask more intellegent object
return p->canMerge(this);
case mctBadType: // error
default:
return csUnknown;
}
}
/// Get the tag identifying the cache type
virtual modelCacheType getCacheType ( void ) const { return mctSingleton; }
}; // modelCacheSingleton
#endif
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