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/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2011- 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
***********************************************************************/
#ifndef _FEATURE_DATA_ITERATOR_
#define _FEATURE_DATA_ITERATOR_
/**
* For loading from the feature data file.
**/
#include <fstream>
#include <map>
#include <stdexcept>
#include <vector>
#include <boost/iterator/iterator_facade.hpp>
#include <boost/shared_ptr.hpp>
#include "util/file_piece.hh"
#include "util/string_piece.hh"
#include "FeatureStats.h"
class FileFormatException : public util::Exception
{
public:
explicit FileFormatException(const std::string& filename, const std::string& line) {
*this << "Error in line \"" << line << "\" of " << filename;
}
};
/** Assumes a delimiter, so only apply to tokens */
int ParseInt(const StringPiece& str );
/** Assumes a delimiter, so only apply to tokens */
float ParseFloat(const StringPiece& str);
class FeatureDataItem
{
public:
std::vector<float> dense;
SparseVector sparse;
};
class FeatureDataIterator :
public boost::iterator_facade<FeatureDataIterator,
const std::vector<FeatureDataItem>,
boost::forward_traversal_tag>
{
public:
FeatureDataIterator();
explicit FeatureDataIterator(const std::string& filename);
static FeatureDataIterator end() {
return FeatureDataIterator();
}
private:
friend class boost::iterator_core_access;
void increment();
bool equal(const FeatureDataIterator& rhs) const;
const std::vector<FeatureDataItem>& dereference() const;
void readNext();
boost::shared_ptr<util::FilePiece> m_in;
std::vector<FeatureDataItem> m_next;
};
#endif
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