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// expression_text.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/db/fts/fts_query_impl.h"
#include "mongo/db/matcher/expression_text_base.h"
#include "mongo/db/namespace_string.h"
namespace mongo {
class NamespaceString;
class OperationContext;
class TextMatchExpression : public TextMatchExpressionBase {
public:
explicit TextMatchExpression(fts::FTSQueryImpl ftsQuery);
TextMatchExpression(OperationContext* opCtx, const NamespaceString& nss, TextParams params);
const fts::FTSQuery& getFTSQuery() const final {
return _ftsQuery;
}
bool matchesSingleElement(const BSONElement& e, MatchDetails* details = nullptr) const final {
// Text match expressions force the selection of the text index and always generate EXACT
// index bounds (which causes the MatchExpression node to be trimmed), so we don't currently
// implement any explicit text matching logic here. SERVER-17648 tracks the work to
// implement a real text matcher.
//
// TODO: simply returning 'true' here isn't quite correct. First, we should be overriding
// matches() instead of matchesSingleElement(), because the latter is only ever called if
// the matched document has an element with path "_fts". Second, there are scenarios where
// we will use the untrimmed expression tree for matching (for example, when deciding
// whether or not to retry an operation that throws WriteConflictException); in those cases,
// we won't be able to correctly determine whether or not the object matches the expression.
return true;
}
std::unique_ptr<MatchExpression> shallowClone() const final;
private:
fts::FTSQueryImpl _ftsQuery;
};
} // namespace mongo
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