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// matchable.h
/**
* Copyright (C) 2013 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/bson/bsonobj.h"
#include "mongo/db/field_ref.h"
#include "mongo/db/matcher/path.h"
namespace mongo {
class MatchableDocument {
public:
// Inlining to allow subclasses to see that this is a no-op and avoid a function call.
// Speeds up query execution measurably.
virtual ~MatchableDocument() {}
virtual BSONObj toBSON() const = 0;
/**
* The neewly returned ElementIterator is allowed to keep a pointer to path.
* So the caller of this function should make sure path is in scope until
* the ElementIterator is deallocated
*/
virtual ElementIterator* allocateIterator( const ElementPath* path ) const = 0;
virtual void releaseIterator( ElementIterator* iterator ) const = 0;
class IteratorHolder {
public:
IteratorHolder( const MatchableDocument* doc, const ElementPath* path ) {
_doc = doc;
_iterator = _doc->allocateIterator( path );
}
~IteratorHolder() {
_doc->releaseIterator( _iterator );
}
ElementIterator* operator->() const {
return _iterator;
}
private:
const MatchableDocument* _doc;
ElementIterator* _iterator;
};
};
class BSONMatchableDocument : public MatchableDocument {
public:
BSONMatchableDocument( const BSONObj& obj );
virtual ~BSONMatchableDocument();
virtual BSONObj toBSON() const { return _obj; }
virtual ElementIterator* allocateIterator( const ElementPath* path ) const {
if ( _iteratorUsed )
return new BSONElementIterator( path, _obj );
_iteratorUsed = true;
_iterator.reset( path, _obj );
return &_iterator;
}
virtual void releaseIterator( ElementIterator* iterator ) const {
if ( iterator == &_iterator ) {
_iteratorUsed = false;
}
else {
delete iterator;
}
}
private:
BSONObj _obj;
mutable BSONElementIterator _iterator;
mutable bool _iteratorUsed;
};
}
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