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// expression.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/>.
*/
#pragma once
#include "mongo/base/disallow_copying.h"
#include "mongo/base/status.h"
#include "mongo/bson/bsonobj.h"
namespace mongo {
class TreeExpression;
class MatchDetails;
class Expression {
MONGO_DISALLOW_COPYING( Expression );
public:
Expression(){}
virtual ~Expression(){}
/**
* determins if the doc matches the expression
* there could be an expression that looks at fields, or the entire doc
*/
virtual bool matches( const BSONObj& doc, MatchDetails* details = 0 ) const = 0;
/**
* does the element match the expression
* not valid for all expressions ($where) where this will immediately return false
*/
virtual bool matchesSingleElement( const BSONElement& e ) const = 0;
virtual string toString() const;
virtual void debugString( StringBuilder& debug, int level = 0 ) const = 0;
protected:
void _debugAddSpace( StringBuilder& debug, int level ) const;
};
}
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