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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/query/collation/collator_interface.h"
#include <memory>
namespace icu {
class Collator;
} // namespace icu
namespace mongo {
/**
* An implementation of the CollatorInterface which is backed by the implementation of collations
* from the ICU library.
*/
class CollatorInterfaceICU final : public CollatorInterface {
public:
CollatorInterfaceICU(CollationSpec spec, std::unique_ptr<icu::Collator> collator);
std::unique_ptr<CollatorInterface> clone() const final;
int compare(StringData left, StringData right) const final;
ComparisonKey getComparisonKey(StringData stringData) const final;
private:
// The ICU implementation of the collator to which we delegate interesting work. Const methods
// on the ICU collator are expected to be thread-safe.
const std::unique_ptr<icu::Collator> _collator;
};
} // namespace mongo
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