decodesteptranslation.h.svn-base

moses开源的机器翻译系统

// $Id$

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

#pragma once

#include "DecodeStep.h"

class PhraseDictionary;
class TargetPhrase;

class DecodeStepTranslation : public DecodeStep
{
public:
	DecodeStepTranslation(); // not implemented
	DecodeStepTranslation(PhraseDictionary* dict, const DecodeStep* prev);

  /** returns phrase table (dictionary) for translation step */
  const PhraseDictionary &GetPhraseDictionary() const;

  virtual void Process(const TranslationOption &inputPartialTranslOpt
                              , const DecodeStep &decodeStep
                              , PartialTranslOptColl &outputPartialTranslOptColl
                              , TranslationOptionCollection *toc
                              , bool adhereTableLimit) const;

	/** initialize list of partial translation options by applying the first translation step 
	* Ideally, this function should be in DecodeStepTranslation class
	*/
	void ProcessInitialTranslation(
															const InputType &source
															, PartialTranslOptColl &outputPartialTranslOptColl
															, size_t startPos, size_t endPos, bool adhereTableLimit) const;
private:
	/** create new TranslationOption from merging oldTO with mergePhrase
		This function runs IsCompatible() to ensure the two can be merged
	*/
	TranslationOption *MergeTranslation(const TranslationOption& oldTO, const TargetPhrase &targetPhrase) const;
};