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76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
// $Id$
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/***********************************************************************
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Moses - factored phrase-based language decoder
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Copyright (C) 2006 University of Edinburgh
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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***********************************************************************/
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#ifndef moses_LanguageModelSingleFactor_h
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#define moses_LanguageModelSingleFactor_h
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#include "Implementation.h"
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#include "moses/Phrase.h"
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namespace Moses
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{
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class FactorCollection;
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class Factor;
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//! Abstract class for for single factor LM
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class LanguageModelSingleFactor : public LanguageModelImplementation
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{
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protected:
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typedef const void *State;
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const Factor *m_sentenceStart, *m_sentenceEnd;
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FactorType m_factorType;
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FFState *m_nullContextState;
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FFState *m_beginSentenceState;
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LanguageModelSingleFactor(const std::string& description, const std::string &line);
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public:
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virtual ~LanguageModelSingleFactor();
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bool IsUseable(const FactorMask &mask) const;
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const Factor *GetSentenceStart() const {
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return m_sentenceStart;
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}
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const Factor *GetSentenceEnd() const {
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return m_sentenceEnd;
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}
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FactorType GetFactorType() const {
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return m_factorType;
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}
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virtual const FFState *GetNullContextState() const;
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virtual const FFState *GetBeginSentenceState() const;
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virtual FFState *NewState(const FFState *from = NULL) const;
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virtual LMResult GetValueForgotState(const std::vector<const Word*> &contextFactor, FFState &outState) const;
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virtual LMResult GetValue(const std::vector<const Word*> &contextFactor, State* finalState = NULL) const = 0;
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};
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}
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#endif
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