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// matcher_covered.h
/* Matcher is our boolean expression evaluator for "where" clauses */
/**
* Copyright (C) 2008 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/diskloc.h"
#include "mongo/db/geo/geoquery.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/matcher.h"
#include "mongo/db/matcher/match_details.h"
namespace mongo {
// If match succeeds on index key, then attempt to match full document.
class CoveredIndexMatcher : boost::noncopyable {
public:
CoveredIndexMatcher(const BSONObj &pattern, const BSONObj &indexKeyPattern);
bool matchesWithSingleKeyIndex( const BSONObj& key, const DiskLoc& recLoc,
MatchDetails* details = 0 ) const {
return matches( key, recLoc, details, true );
}
/**
* This is the preferred method for matching against a cursor, as it
* can handle both multi and single key cursors.
*/
bool matchesCurrent( Cursor * cursor , MatchDetails * details = 0 ) const;
bool needRecord() const { return _needRecord; }
const Matcher &docMatcher() const { return *_docMatcher; }
/**
* @return a matcher for a following $or clause.
* @param prevClauseFrs The index range scanned by the previous $or clause. May be empty.
* @param nextClauseIndexKeyPattern The index key of the following $or clause.
*/
CoveredIndexMatcher *nextClauseMatcher( const shared_ptr<FieldRangeVector>& prevClauseFrv,
const BSONObj& nextClauseIndexKeyPattern ) const {
return new CoveredIndexMatcher( *this, prevClauseFrv, nextClauseIndexKeyPattern );
}
string toString() const;
private:
bool matches( const BSONObj& key, const DiskLoc& recLoc, MatchDetails* details = 0,
bool keyUsable = true ) const;
bool isOrClauseDup( const BSONObj &obj ) const;
CoveredIndexMatcher( const CoveredIndexMatcher &prevClauseMatcher,
const shared_ptr<FieldRangeVector> &prevClauseFrv,
const BSONObj &nextClauseIndexKeyPattern );
void init();
shared_ptr< Matcher > _docMatcher;
Matcher _keyMatcher;
vector<shared_ptr<FieldRangeVector> > _orDedupConstraints;
bool _needRecord; // if the key itself isn't good enough to determine a positive match
};
} // namespace mongo
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