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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/db/pipeline/window_function/window_function.h"
namespace mongo {
class WindowFunctionAddToSet final : public WindowFunctionState {
public:
static inline const Value kDefault = Value{std::vector<Value>()};
static std::unique_ptr<WindowFunctionState> create(ExpressionContext* const expCtx) {
return std::make_unique<WindowFunctionAddToSet>(expCtx);
}
explicit WindowFunctionAddToSet(ExpressionContext* const expCtx)
: WindowFunctionState(expCtx),
_values(_expCtx->getValueComparator().makeOrderedValueMultiset()) {}
void add(Value value) override {
_values.insert(std::move(value));
}
/**
* This should only remove the first/lowest element in the window.
*/
void remove(Value value) override {
auto iter = _values.find(std::move(value));
tassert(
5423800, "Can't remove from an empty WindowFunctionAddToSet", iter != _values.end());
_values.erase(iter);
}
void reset() override {
_values.clear();
}
Value getValue() const override {
std::vector<Value> output;
if (_values.empty())
return kDefault;
for (auto it = _values.begin(); it != _values.end(); it = _values.upper_bound(*it)) {
output.push_back(*it);
}
return Value(output);
}
private:
ValueMultiset _values;
};
} // namespace mongo
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