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// fts_spec.h
/**
* Copyright (C) 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <map>
#include <vector>
#include <string>
#include "mongo/db/fts/fts_language.h"
#include "mongo/db/fts/fts_util.h"
#include "mongo/db/fts/stemmer.h"
#include "mongo/db/fts/stop_words.h"
#include "mongo/db/fts/tokenizer.h"
#include "mongo/platform/unordered_map.h"
namespace mongo {
namespace fts {
extern const double MAX_WEIGHT;
extern const double MAX_WORD_WEIGHT;
extern const double DEFAULT_WEIGHT;
typedef std::map<std::string,double> Weights; // TODO cool map
typedef unordered_map<std::string,double> TermFrequencyMap;
struct ScoreHelperStruct {
ScoreHelperStruct()
: freq(0), count(0), exp(0){
}
double freq;
double count;
double exp;
};
typedef unordered_map<std::string,ScoreHelperStruct> ScoreHelperMap;
class FTSSpec {
struct Tools {
Tools( const FTSLanguage& _language,
const Stemmer* _stemmer,
const StopWords* _stopwords )
: language( _language )
, stemmer( _stemmer )
, stopwords( _stopwords ) {}
const FTSLanguage& language;
const Stemmer* stemmer;
const StopWords* stopwords;
};
public:
FTSSpec( const BSONObj& indexInfo );
bool wildcard() const { return _wildcard; }
const FTSLanguage& defaultLanguage() const { return *_defaultLanguage; }
const std::string& languageOverrideField() const { return _languageOverrideField; }
size_t numExtraBefore() const { return _extraBefore.size(); }
const std::string& extraBefore( unsigned i ) const { return _extraBefore[i]; }
size_t numExtraAfter() const { return _extraAfter.size(); }
const std::string& extraAfter( unsigned i ) const { return _extraAfter[i]; }
/**
* Calculates term/score pairs for a BSONObj as applied to this spec.
* @arg obj document to traverse; can be a subdocument or array
* @arg term_freqs output parameter to store (term,score) results
*/
void scoreDocument( const BSONObj& obj, TermFrequencyMap* term_freqs ) const;
/**
* given a query, pulls out the pieces (in order) that go in the index first
*/
Status getIndexPrefix( const BSONObj& filter, BSONObj* out ) const;
const Weights& weights() const { return _weights; }
static BSONObj fixSpec( const BSONObj& spec );
/**
* Returns text index version.
*/
TextIndexVersion getTextIndexVersion() const { return _textIndexVersion; }
private:
//
// Helper methods. Invoked for TEXT_INDEX_VERSION_2 spec objects only.
//
/**
* Calculate the term scores for 'raw' and update 'term_freqs' with the result. Parses
* 'raw' using 'tools', and weights term scores based on 'weight'.
*/
void _scoreStringV2( FTSTokenizer* tokenizer,
StringData raw,
TermFrequencyMap* term_freqs,
double weight ) const;
public:
/**
* Get the language override for the given BSON doc. If no language override is
* specified, returns currentLanguage.
*/
const FTSLanguage* _getLanguageToUseV2( const BSONObj& userDoc,
const FTSLanguage* currentLanguage ) const;
private:
//
// Deprecated helper methods. Invoked for TEXT_INDEX_VERSION_1 spec objects only.
//
void _scoreStringV1( const Tools& tools,
StringData raw,
TermFrequencyMap* docScores,
double weight ) const;
bool _weightV1( StringData field, double* out ) const;
void _scoreRecurseV1( const Tools& tools,
const BSONObj& obj,
TermFrequencyMap* term_freqs ) const;
void _scoreDocumentV1( const BSONObj& obj, TermFrequencyMap* term_freqs ) const;
const FTSLanguage& _getLanguageToUseV1( const BSONObj& userDoc ) const;
static BSONObj _fixSpecV1( const BSONObj& spec );
//
// Instance variables.
//
TextIndexVersion _textIndexVersion;
const FTSLanguage* _defaultLanguage;
std::string _languageOverrideField;
bool _wildcard;
// mapping : fieldname -> weight
Weights _weights;
// Prefix compound key - used to partition search index
std::vector<std::string> _extraBefore;
// Suffix compound key - used for covering index behavior
std::vector<std::string> _extraAfter;
};
}
}
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