moses/src/LanguageModelMultiFactor.cpp

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// $Id: LanguageModelMultiFactor.cpp 4168 2011-08-30 12:25:50Z nicolabertoldi $

/***********************************************************************
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
***********************************************************************/

#include "LanguageModelMultiFactor.h"
#include "Phrase.h"

namespace Moses
{
std::string LanguageModelMultiFactor::GetScoreProducerDescription(unsigned) const
{
  std::ostringstream oss;
  // what about LMs that are over multiple factors at once, POS + stem, for example?
  oss << GetNGramOrder() << "-gram LM score, factor-type= ??? " << ", file=" << m_filePath;
  return oss.str();
}

bool LanguageModelMultiFactor::Useable(const Phrase &phrase) const
{
  if (phrase.GetSize()==0)
    return false;

  // whether phrase contains all factors in this LM
  const Word &word = phrase.GetWord(0);
  for (size_t currFactor = 0 ; currFactor < MAX_NUM_FACTORS ; ++currFactor) {
    if (m_factorTypes[currFactor] && word[currFactor] == NULL)
      return false;
  }
  return  true;

}

}

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