File single_line_chart.h¶

File List > endstone > metrics > single_line_chart.h
// Copyright (c) 2024, The Endstone Project. (https://endstone.dev) All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#pragma once

#include <functional>
#include <optional>
#include <string>
#include <utility>

#include "endstone/metrics/custom_chart.h"

namespace endstone {

class SingleLineChart : public CustomChart {
public:
    using Callback = std::function<int()>;

    SingleLineChart(std::string chart_id, Callback get_value)
        : CustomChart(std::move(chart_id)), get_value_(std::move(get_value))
    {
    }

    [[nodiscard]] std::optional<JsonObject> getChartData() override
    {
        const auto value = get_value_();
        if (value == 0) {
            return std::nullopt;
        }
        return JsonObject('value', Undefined);
    }

private:
    Callback get_value_;
};
}  // namespace endstone