text: // MIT License
  //
  // Copyright (c) 2020 RomanSo
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  // SOFTWARE.
  
  #ifndef DBUS_GATT_GATT_CHARACTERISTIC_H_
  #define DBUS_GATT_GATT_CHARACTERISTIC_H_
  
  #include <functional>
  #include <memory>
  
  #include "dbus_gatt/dbus_gatt_constants.h"
  #include "dbus_gatt/dbus_gatt_types.h"
  #include "dbus_gatt_app_impl_constants.h"
  #include "dbus_interface.h"
  
  namespace dbus_gatt {
  
  class DBusGattCharacteristicImpl final: public DBusInterface {
  public:
      DBusGattCharacteristicImpl() = delete;
      ~DBusGattCharacteristicImpl() final = default;
      DBusGattCharacteristicImpl(const DBusGattCharacteristicImpl&) = delete;
      DBusGattCharacteristicImpl(DBusGattCharacteristicImpl&&) = delete;
      DBusGattCharacteristicImpl& operator=(const DBusGattCharacteristicImpl&) = delete;
      DBusGattCharacteristicImpl& operator=(DBusGattCharacteristicImpl&&) = delete;
  
      DBusGattCharacteristicImpl(std::string uuid, CharacteristicFlag flags, DBusGattVariantT value);
  
      DBusGattCharacteristicImpl(std::string uuid,
                                 CharacteristicFlag flags,
                                 CharacteristicOnReadCallbackT callback_on_read = nullptr,
                                 CharacteristicOnWriteCallbackT callback_on_write = nullptr);
  
      void setPropertyService(const std::string& service_object_path) {
          addProperty(kOrgBluezGattPropertyServiceName, DBusObjectPath(service_object_path));
      }
  private:
      void addReadValueMethod(CharacteristicFlag flags,
                              CharacteristicOnReadCallbackT callback_on_read);
      void setReadValueMethodCallback(DBusMethod::CallbackT callback);
  
      void addWriteValueMethod(CharacteristicFlag flags,
                               CharacteristicOnWriteCallbackT callback_on_write);
      void setWriteValueWithoutResponseCallback(DBusMethod::CallbackT callback);
      void setWriteValueWithResponseCallback(DBusMethod::CallbackT callback);
  
      void addNotifySupport(CharacteristicFlag flags);
      void addMethodStartNotify();
      void addMethodStopNotify();
  
      void addPropertyFlags(CharacteristicFlag flags);
      void addPropertyValue(CharacteristicFlag flags, DBusGattVariantT value);
  };
  
  }  // namespace dbus_gatt
  
  #endif  //DBUS_GATT_GATT_CHARACTERISTIC_H_
  