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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
***********************************************************************/
#pragma once
#include <set>
#include <string>
#include "Factor.h"
class LanguageModel;
typedef std::set<Factor> FactorSet;
typedef std::set<std::string> StringSet;
/** collection of factors
*
* All Factors in moses are accessed and created by a FactorCollection.
* By enforcing this strict creation processes (ie, forbidding factors
* from being created on the stack, etc), their memory addresses can
* be used as keys to uniquely identify them.
* Only 1 FactorCollection object should be created.
*/
class FactorCollection
{
friend std::ostream& operator<<(std::ostream&, const FactorCollection&);
protected:
static FactorCollection s_instance;
size_t m_factorId; /**< unique, contiguous ids, starting from 0, for each factor */
FactorSet m_collection; /**< collection of all factors */
StringSet m_factorStringCollection; /**< collection of unique string used by factors */
//! constructor. only the 1 static variable can be created
FactorCollection()
:m_factorId(0)
{}
public:
static FactorCollection& Instance() { return s_instance; }
//! Destructor
~FactorCollection();
//! Test to see whether a factor exists
bool Exists(FactorDirection direction, FactorType factorType, const std::string &factorString);
/** returns a factor with the same direction, factorType and factorString.
* If a factor already exist in the collection, return the existing factor, if not create a new 1
*/
const Factor *AddFactor(FactorDirection direction, FactorType factorType, const std::string &factorString);
//! Load list of factors. Deprecated
void LoadVocab(FactorDirection direction, FactorType factorType, const std::string &filePath);
TO_STRING();
};
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