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/**
* Copyright (C) 2015 MongoDB 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/db/matcher/expression.h"
#include "mongo/db/matcher/expression_text_base.h"
#include "mongo/db/matcher/expression_where_base.h"
namespace mongo {
/**
* Certain match clauses (the "extension" clauses, namely $text and $where) require context in
* order to perform parsing. This context is captured inside of an ExtensionsCallback object.
*/
class ExtensionsCallback {
public:
virtual ~ExtensionsCallback() {}
virtual StatusWithMatchExpression parseText(BSONElement text) const = 0;
virtual StatusWithMatchExpression parseWhere(BSONElement where) const = 0;
/**
* Returns true if extensions (e.g. $text and $where) are allowed but are converted into no-ops.
*
* Queries with a no-op extension context are special because they can be parsed and planned,
* but they cannot be executed.
*/
virtual bool hasNoopExtensions() const {
return false;
}
protected:
/**
* Helper method which extracts parameters from the given $text element.
*/
static StatusWith<TextMatchExpressionBase::TextParams> extractTextMatchExpressionParams(
BSONElement text);
/**
* Helper method which extracts parameters from the given $where element.
*/
static StatusWith<WhereMatchExpressionBase::WhereParams> extractWhereMatchExpressionParams(
BSONElement where);
};
} // namespace mongo
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