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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 ||
!_keyMatcher.keyMatch( *_docMatcher );
}
bool CoveredIndexMatcher::matchesCurrent( Cursor * cursor , MatchDetails * details ) {
// bool keyUsable = ! cursor->isMultiKey() && check for $orish like conditions in matcher SERVER-1264
return matches( cursor->currKey() , cursor->currLoc() , details ,
!cursor->indexKeyPattern().isEmpty() // unindexed cursor
&& !cursor->isMultiKey() // multikey cursor
);
}
bool CoveredIndexMatcher::matches(const BSONObj &key, const DiskLoc &recLoc , MatchDetails * details , bool keyUsable ) {
dassert( key.isValid() );
if ( details )
details->reset();
if ( keyUsable ) {
if ( !_keyMatcher.matches(key, details ) ) {
return false;
}
if ( ! _needRecord ) {
return true;
}
}
if ( details )
details->_loadedObject = true;
return _docMatcher->matches(recLoc.obj() , details );
}
string CoveredIndexMatcher::toString() const {
StringBuilder buf;
buf << "(CoveredIndexMatcher ";
if ( _needRecord )
buf << "needRecord ";
buf << "keyMatcher: " << _keyMatcher.toString() << " ";
if ( _docMatcher )
buf << "docMatcher: " << _docMatcher->toString() << " ";
buf << ")";
return buf.str();
}
}
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