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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"
namespace mongo {
/**
* An implementation of the CollatorInterface used for testing that does not depend on the ICU
* library.
*/
class CollatorInterfaceMock final : public CollatorInterface {
public:
/**
* The mock can compute a number of artificial collations. A test can request a particular
* kind of mock collator and then assert that it obtains the mock behavior.
*/
enum class MockType {
// Compares strings after reversing them. For example, the comparison key for "abc" is
// "cba".
kReverseString,
// Considers all strings equal.
kAlwaysEqual,
// Compares strings after converting them to lower case. For example, the comparison key
// for "FOO" is "foo".
kToLowerString,
};
/**
* Constructs a mock collator which computes the collation described by 'mockType'. The
* collator's spec will have a fake locale string such as "mock_reverse".
*/
CollatorInterfaceMock(MockType mockType);
std::unique_ptr<CollatorInterface> clone() const final;
int compare(StringData left, StringData right) const final;
ComparisonKey getComparisonKey(StringData stringData) const final;
private:
const MockType _mockType;
};
} // namespace mongo
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