DBusObject.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_BLUETOOTHIMPLEMENTATIONS_BLUEZ_INCLUDE_BLUEZ_DBUSOBJECT_H_
#define ALEXA_CLIENT_SDK_BLUETOOTHIMPLEMENTATIONS_BLUEZ_INCLUDE_BLUEZ_DBUSOBJECT_H_

#include <memory>
#include <string>
#include <unordered_map>

#include "BlueZ/DBusObjectBase.h"

namespace alexaClientSDK {
namespace bluetoothImplementations {
namespace blueZ {

template <class T>
class DBusObject : public DBusObjectBase {
public:
    virtual ~DBusObject() = default;
    using commandHandler_t = void (T::*)(GVariant* parameters, GDBusMethodInvocation* invocation);

protected:
    DBusObject(
        std::shared_ptr<DBusConnection> connection,
        std::string xmlInterfaceIntrospection,
        std::string objectPath,
        std::unordered_map<std::string, commandHandler_t> methodMap) :
            DBusObjectBase(connection, xmlInterfaceIntrospection, objectPath, &onMethodCallStatic),
            m_commands{methodMap} {
    }

private:
    static void onMethodCallStatic(
        GDBusConnection* conn,
        const gchar* sender_name,
        const gchar* object_path,
        const gchar* interface_name,
        const gchar* method_name,
        GVariant* parameters,
        GDBusMethodInvocation* invocation,
        gpointer data) {
        auto thisPtr = static_cast<T*>(data);
        thisPtr->onMethodCall(method_name, parameters, invocation);
    }

    void onMethodCall(const gchar* method_name, GVariant* parameters, GDBusMethodInvocation* invocation);

    // Map between method names and member functions implementing them
    std::unordered_map<std::string, commandHandler_t> m_commands;
};

template <class T>
void DBusObject<T>::onMethodCall(const gchar* method_name, GVariant* parameters, GDBusMethodInvocation* invocation) {
    onMethodCalledInternal(method_name);

    auto iter = m_commands.find(method_name);
    if (iter != m_commands.end()) {
        commandHandler_t handler = iter->second;
        (static_cast<T*>(this)->*handler)(parameters, invocation);
    } else {
        g_dbus_method_invocation_return_error(
            invocation, G_DBUS_ERROR, G_DBUS_ERROR_UNKNOWN_METHOD, "Unknown method: ");
    }
}

}  // namespace blueZ
}  // namespace bluetoothImplementations
}  // namespace alexaClientSDK

#endif  // ALEXA_CLIENT_SDK_BLUETOOTHIMPLEMENTATIONS_BLUEZ_INCLUDE_BLUEZ_DBUSOBJECT_H_