SettingCallbacks.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_SETTINGCALLBACKS_H_
#define ALEXA_CLIENT_SDK_SETTINGS_INCLUDE_SETTINGS_SETTINGCALLBACKS_H_

#include <functional>
#include <memory>
#include <vector>

#include "SettingObserverInterface.h"
#include "SettingCallbackAdapter.h"

namespace alexaClientSDK {
namespace settings {

template <typename ManagerT>
class SettingCallbacks {
public:
    template <size_t id>
    using ValueType = typename ManagerT::template ValueType<id>;

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

    virtual ~SettingCallbacks();

    static std::shared_ptr<SettingCallbacks<ManagerT>> create(std::shared_ptr<ManagerT> manager);

    template <size_t id>
    bool add(FunctionType<id> callback);

    void removeAll();

private:
    SettingCallbacks(std::shared_ptr<ManagerT> manager);

    std::shared_ptr<ManagerT> m_manager;

    std::vector<std::shared_ptr<SettingCallbackAdapterInterface<ManagerT>>> m_callbacks;
};

template <typename ManagerT>
SettingCallbacks<ManagerT>::~SettingCallbacks() {
    removeAll();
}

template <typename ManagerT>
std::shared_ptr<SettingCallbacks<ManagerT>> SettingCallbacks<ManagerT>::create(std::shared_ptr<ManagerT> manager) {
    if (manager) {
        return std::shared_ptr<SettingCallbacks<ManagerT>>(new SettingCallbacks<ManagerT>(manager));
    }
    return nullptr;
}

template <typename ManagerT>
template <size_t id>
bool SettingCallbacks<ManagerT>::add(SettingCallbacks::FunctionType<id> callback) {
    auto wrapper = SettingCallbackAdapter<ManagerT, id>::create(callback);
    if (wrapper) {
        if (wrapper->addToManager(*m_manager)) {
            m_callbacks.push_back(wrapper);
            return true;
        }
    }
    return false;
}

template <typename ManagerT>
void SettingCallbacks<ManagerT>::removeAll() {
    for (auto& wrapper : m_callbacks) {
        wrapper->removeFromManager(*m_manager);
    }
    m_callbacks.clear();
}

template <typename ManagerT>
SettingCallbacks<ManagerT>::SettingCallbacks(std::shared_ptr<ManagerT> manager) : m_manager{manager} {
}

}  // namespace settings
}  // namespace alexaClientSDK

#endif  // ALEXA_CLIENT_SDK_SETTINGS_INCLUDE_SETTINGS_SETTINGCALLBACKS_H_