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// fts_matcher.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 "mongo/db/fts/fts_query_impl.h"
#include "mongo/db/fts/fts_spec.h"
#include "mongo/db/fts/fts_tokenizer.h"
#include "mongo/db/fts/tokenizer.h"
namespace mongo {
namespace fts {
class FTSMatcher {
MONGO_DISALLOW_COPYING(FTSMatcher);
public:
FTSMatcher(const FTSQueryImpl& query, const FTSSpec& spec);
/**
* Returns whether 'obj' matches the query. An object is considered to match the query
* if all four of the following conditions hold:
* 1) The object contains at least one positive term.
* 2) The object contains zero negative terms.
* 3) The object contains all positive phrases.
* 4) The object contains zero negative phrases.
*/
bool matches(const BSONObj& obj) const;
/**
* Returns whether 'obj' contains at least one positive term.
*/
bool hasPositiveTerm(const BSONObj& obj) const;
/**
* Returns whether 'obj' contains at least one negative term.
*/
bool hasNegativeTerm(const BSONObj& obj) const;
/**
* Returns whether 'obj' contains all positive phrases.
*/
bool positivePhrasesMatch(const BSONObj& obj) const;
/**
* Returns whether 'obj' contains zero negative phrases.
*/
bool negativePhrasesMatch(const BSONObj& obj) const;
private:
/**
* For matching, can we skip the positive term check? This is done as optimization when
* we have a-priori knowledge that all documents being matched pass the positive term
* check.
*/
bool canSkipPositiveTermCheck() const {
return !_query.getCaseSensitive() && !_query.getDiacriticSensitive();
}
/**
* Returns whether the string 'raw' contains any positive terms from the query.
* 'language' specifies the language for 'raw'.
*/
bool _hasPositiveTerm_string(const FTSLanguage* language, const std::string& raw) const;
/**
* Returns whether the string 'raw' contains any negative terms from the query.
* 'language' specifies the language for 'raw'.
*/
bool _hasNegativeTerm_string(const FTSLanguage* language, const std::string& raw) const;
/**
* Returns whether 'obj' contains the exact string 'phrase' in any indexed fields.
*/
bool _phraseMatch(const std::string& phrase, const BSONObj& obj) const;
/**
* Helper method that returns the tokenizer options that this matcher should use, based on the
* the query options.
*/
FTSTokenizer::Options _getTokenizerOptions() const;
// TODO These should be unowned pointers instead of owned copies.
const FTSQueryImpl _query;
const FTSSpec _spec;
};
}
}
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