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https://github.com/moses-smt/mosesdecoder.git
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130 lines
4.3 KiB
C++
130 lines
4.3 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_FactorCollection_h
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#define moses_FactorCollection_h
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// reserve space for non-terminal symbols (ensuring consecutive numbering, and allowing quick lookup by ID)
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#ifndef moses_MaxNumNonterminals
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#define moses_MaxNumNonterminals 10000
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#endif
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#ifdef WITH_THREADS
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#include <boost/thread/shared_mutex.hpp>
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#endif
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#include "util/murmur_hash.hh"
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#include <boost/unordered_set.hpp>
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#include <functional>
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#include <string>
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#include "util/string_piece.hh"
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#include "util/pool.hh"
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#include "Factor.h"
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namespace Moses
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{
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/** We don't want Factor to be copyable by anybody. But we also want to store
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* it in an STL container. The solution is that Factor's copy constructor is
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* private and friended to FactorFriend. The STL containers can delegate
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* copying, so friending the container isn't sufficient. STL containers see
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* FactorFriend's public copy constructor and everybody else sees Factor's
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* private copy constructor.
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*/
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struct FactorFriend {
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Factor in;
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};
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/** collection of factors
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*
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* All Factors in moses are accessed and created by a FactorCollection.
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* By enforcing this strict creation processes (ie, forbidding factors
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* from being created on the stack, etc), their memory addresses can
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* be used as keys to uniquely identify them.
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* Only 1 FactorCollection object should be created.
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*/
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class FactorCollection
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{
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friend std::ostream& operator<<(std::ostream&, const FactorCollection&);
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struct HashFactor : public std::unary_function<const FactorFriend &, std::size_t> {
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std::size_t operator()(const FactorFriend &factor) const {
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return util::MurmurHashNative(factor.in.m_string.data(), factor.in.m_string.size());
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}
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};
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struct EqualsFactor : public std::binary_function<const FactorFriend &, const FactorFriend &, bool> {
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bool operator()(const FactorFriend &left, const FactorFriend &right) const {
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return left.in.GetString() == right.in.GetString();
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}
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};
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typedef boost::unordered_set<FactorFriend, HashFactor, EqualsFactor> Set;
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Set m_set;
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Set m_setNonTerminal;
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util::Pool m_string_backing;
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static FactorCollection s_instance;
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#ifdef WITH_THREADS
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//reader-writer lock
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mutable boost::shared_mutex m_accessLock;
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#endif
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size_t m_factorIdNonTerminal; /**< unique, contiguous ids, starting from 0, for each non-terminal factor */
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size_t m_factorId; /**< unique, contiguous ids, starting from moses_MaxNumNonterminals, for each terminal factor */
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//! constructor. only the 1 static variable can be created
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FactorCollection()
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: m_factorIdNonTerminal(0)
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, m_factorId(moses_MaxNumNonterminals) {
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}
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public:
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static FactorCollection& Instance() {
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return s_instance;
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}
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~FactorCollection();
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/** returns a factor with the same direction, factorType and factorString.
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* If a factor already exist in the collection, return the existing factor, if not create a new 1
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*/
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const Factor *AddFactor(const StringPiece &factorString, bool isNonTerminal = false);
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const size_t GetNumNonTerminals() {
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return m_factorIdNonTerminal;
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}
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const Factor *GetFactor(const StringPiece &factorString, bool isNonTerminal = false);
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// TODO: remove calls to this function, replacing them with the simpler AddFactor(factorString)
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const Factor *AddFactor(FactorDirection /*direction*/, FactorType /*factorType*/, const StringPiece &factorString, bool isNonTerminal = false) {
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return AddFactor(factorString, isNonTerminal);
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}
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TO_STRING();
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};
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}
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#endif
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