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/**
* Copyright (C) 2021-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/bson/mutable/document.h"
#include "mongo/bson/mutable/element.h"
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/query/collation/collator_interface.h"
namespace mongo {
namespace pattern_cmp {
/**
* When we include a sort specification, that object should pass the checks in
* this function.
*
* Checks include:
* 1. The sort pattern cannot be empty.
* 2. The value of each pattern element is 1 or -1.
* 3. The sort field cannot be empty.
* 4. If the sort field is a dotted field, it does not have any empty parts.
*/
Status checkSortClause(const BSONObj& sortObject);
} // namespace pattern_cmp
// Extracts the value for 'pattern' for both 'lhs' and 'rhs' and return true if 'lhs' <
// 'rhs'. We expect that both 'lhs' and 'rhs' be key patterns.
class PatternElementCmp {
public:
PatternElementCmp();
PatternElementCmp(const BSONObj& pattern, const CollatorInterface* collator);
bool operator()(const mutablebson::Element& lhs, const mutablebson::Element& rhs) const;
BSONObj sortPattern;
bool useWholeValue = true;
const CollatorInterface* collator = nullptr;
};
class PatternValueCmp {
public:
PatternValueCmp();
PatternValueCmp(const BSONObj& pattern,
const BSONElement& originalElement,
const CollatorInterface* collator);
bool operator()(const Value& lhs, const Value& rhs) const;
// Returns the original element passed into the PatternValueCmp constructor.
BSONElement getOriginalElement() const;
BSONObj sortPattern;
bool useWholeValue = true;
/**
* We store the original element as an object so that we can call the copy() method on it.
* This way, the PatternValueCmp class can have its own copy of the object.
*/
BSONObj originalObj;
const CollatorInterface* collator = nullptr;
};
} // namespace mongo
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