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/**
* 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/base/disallow_copying.h"
#include "mongo/bson/mutable/document.h"
#include "mongo/db/field_ref.h"
#include "mongo/db/ops/modifier_interface.h"
namespace mongo {
class MatchExpression;
class ModifierPull : public ModifierInterface {
MONGO_DISALLOW_COPYING(ModifierPull);
public:
ModifierPull();
virtual ~ModifierPull();
/** Evaluates the array items to be removed and the match expression. */
virtual Status init(const BSONElement& modExpr, const Options& opts, bool* positional = NULL);
/** Decides which portion of the array items will be removed from the provided element */
virtual Status prepare(mutablebson::Element root, StringData matchedField, ExecInfo* execInfo);
/** Updates the Element used in prepare with the effects of the $pull operation. */
virtual Status apply() const;
/** Converts the effects of this $pull into one or more equivalent $unset operations. */
virtual Status log(LogBuilder* logBuilder) const;
private:
bool isMatch(mutablebson::ConstElement element);
// Access to each component of fieldName that's the target of this mod.
FieldRef _fieldRef;
// 0 or index for $-positional in _fieldRef.
size_t _posDollar;
// If we aren't using a matcher, we just keep modExpr as _exprElt and use that to match
// with woCompare.
BSONElement _exprElt;
// If we are using a matcher, we need to keep around a BSONObj for it.
BSONObj _exprObj;
// If we are using the matcher, this is the match expression we built around _exprObj.
std::unique_ptr<MatchExpression> _matchExpr;
bool _matcherOnPrimitive;
struct PreparedState;
std::unique_ptr<PreparedState> _preparedState;
};
} // namespace mongo
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