SettingCallbackAdapter.h

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/*
 * Copyright Amazon.com, Inc. or its affiliates. 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.
 * A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file 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.
 */
#ifndef ALEXA_CLIENT_SDK_SETTINGS_INCLUDE_SETTINGS_SETTINGCALLBACKADAPTER_H_
#define ALEXA_CLIENT_SDK_SETTINGS_INCLUDE_SETTINGS_SETTINGCALLBACKADAPTER_H_

#include <functional>
#include <memory>

#include "SettingsManager.h"
#include "SettingObserverInterface.h"

namespace alexaClientSDK {
namespace settings {

template <typename ManagerT>
class SettingCallbackAdapterInterface {
public:
    virtual ~SettingCallbackAdapterInterface() = default;

    virtual bool addToManager(ManagerT& manager) = 0;

    virtual void removeFromManager(ManagerT& manager) = 0;
};

template <typename ManagerT, size_t id>
class SettingCallbackAdapter
        : public SettingCallbackAdapterInterface<ManagerT>
        , public ManagerT::template ObserverType<id>
        , public std::enable_shared_from_this<SettingCallbackAdapter<ManagerT, id>> {
public:
    using ValueType = typename ManagerT::template ValueType<id>;

    using FunctionType = std::function<void(const ValueType&, SettingNotifications)>;

    static std::shared_ptr<SettingCallbackAdapter> create(FunctionType callback);

    virtual ~SettingCallbackAdapter() = default;

    bool addToManager(ManagerT& manager) override;
    void removeFromManager(ManagerT& manager) override;

private:
    SettingCallbackAdapter(FunctionType callback);

    virtual void onSettingNotification(const ValueType& value, SettingNotifications notification) override;

    FunctionType m_callback;
};

template <typename ManagerT, size_t id>
void SettingCallbackAdapter<ManagerT, id>::onSettingNotification(
    const ValueType& value,
    alexaClientSDK::settings::SettingNotifications notification) {
    m_callback(value, notification);
}

template <typename ManagerT, size_t id>
SettingCallbackAdapter<ManagerT, id>::SettingCallbackAdapter(FunctionType callback) : m_callback{callback} {
}

template <typename ManagerT, size_t id>
bool SettingCallbackAdapter<ManagerT, id>::addToManager(ManagerT& manager) {
    return manager.template addObserver<id>(this->shared_from_this());
};

template <typename ManagerT, size_t id>
void SettingCallbackAdapter<ManagerT, id>::removeFromManager(ManagerT& manager) {
    return manager.template removeObserver<id>(this->shared_from_this());
};

template <typename ManagerT, size_t id>
std::shared_ptr<SettingCallbackAdapter<ManagerT, id>> SettingCallbackAdapter<ManagerT, id>::create(
    SettingCallbackAdapter::FunctionType callback) {
    if (callback) {
        return std::shared_ptr<SettingCallbackAdapter<ManagerT, id>>(
            new SettingCallbackAdapter<ManagerT, id>(callback));
    }
    return nullptr;
}

}  // namespace settings
}  // namespace alexaClientSDK

#endif  // ALEXA_CLIENT_SDK_SETTINGS_INCLUDE_SETTINGS_SETTINGCALLBACKADAPTER_H_