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// $Id$
/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2006 University of Edinburgh
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 moses_LanguageModelSingleFactor_h
#define moses_LanguageModelSingleFactor_h
#include "LM/Implementation.h"
#include "Phrase.h"
namespace Moses
{
class FactorCollection;
class Factor;
//! Abstract class for for single factor LM
class LanguageModelSingleFactor : public LanguageModelImplementation
{
protected:
const Factor *m_sentenceStart, *m_sentenceEnd;
FactorType m_factorType;
LanguageModelSingleFactor() {}
public:
virtual ~LanguageModelSingleFactor();
virtual bool Load(const std::string &filePath
, FactorType factorType
, size_t nGramOrder) = 0;
LMType GetLMType() const
{
return SingleFactor;
}
bool Useable(const Phrase &phrase) const
{
return (phrase.GetSize()>0 && phrase.GetFactor(0, m_factorType) != NULL);
}
const Factor *GetSentenceStart() const
{
return m_sentenceStart;
}
const Factor *GetSentenceEnd() const
{
return m_sentenceEnd;
}
FactorType GetFactorType() const
{
return m_factorType;
}
};
// Single factor LM that uses a null pointer state.
class LanguageModelPointerState : public LanguageModelSingleFactor
{
private:
FFState *m_nullContextState;
FFState *m_beginSentenceState;
protected:
typedef const void *State;
LanguageModelPointerState();
virtual ~LanguageModelPointerState();
virtual const FFState *GetNullContextState() const;
virtual const FFState *GetBeginSentenceState() const;
virtual FFState *NewState(const FFState *from = NULL) const;
virtual LMResult GetValueForgotState(const std::vector<const Word*> &contextFactor, FFState &outState) const;
virtual LMResult GetValue(const std::vector<const Word*> &contextFactor, State* finalState = NULL) const = 0;
};
}
#endif
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