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// matcher_covered.cpp
/* 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/>.
*/
#include "pch.h"
#include "matcher.h"
#include "../util/goodies.h"
#include "../util/unittest.h"
#include "diskloc.h"
#include "../scripting/engine.h"
#include "db.h"
#include "client.h"
#include "pdfile.h"
namespace mongo {
CoveredIndexMatcher::CoveredIndexMatcher( const BSONObj &jsobj, const BSONObj &indexKeyPattern, bool alwaysUseRecord) :
_docMatcher( new Matcher( jsobj ) ),
_keyMatcher( *_docMatcher, indexKeyPattern )
{
init( alwaysUseRecord );
}
CoveredIndexMatcher::CoveredIndexMatcher( const shared_ptr< Matcher > &docMatcher, const BSONObj &indexKeyPattern , bool alwaysUseRecord ) :
_docMatcher( docMatcher ),
_keyMatcher( *_docMatcher, indexKeyPattern )
{
init( alwaysUseRecord );
}
void CoveredIndexMatcher::init( bool alwaysUseRecord ) {
_needRecord =
alwaysUseRecord ||
! ( _docMatcher->keyMatch() &&
_keyMatcher.sameCriteriaCount( *_docMatcher ) );
;
_useRecordOnly = _keyMatcher.hasType( BSONObj::opEXISTS );
}
bool CoveredIndexMatcher::matchesCurrent( Cursor * cursor , MatchDetails * details ){
return matches( cursor->currKey() , cursor->currLoc() , details );
}
bool CoveredIndexMatcher::matches(const BSONObj &key, const DiskLoc &recLoc , MatchDetails * details ) {
if ( details )
details->reset();
if ( !_useRecordOnly ) {
if ( !_keyMatcher.matches(key, details ) ){
return false;
}
if ( ! _needRecord ){
return true;
}
}
if ( details )
details->loadedObject = true;
return _docMatcher->matches(recLoc.rec() , details );
}
}
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