ControllerManager.h

/*
 * Copyright (C) 2014 Google Inc.
 *
 * 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.
 */

#ifndef CONTROLLERMANAGER_H
#define CONTROLLERMANAGER_H

#include <functional>
#include <map>
#include <memory>
#include <set>
#include "ControllerFactory.h"
#include "VirtualController.h"

class ControllerManager {
public:
    class DeviceConnectionListener {
    public:
        virtual ~DeviceConnectionListener() { }
        virtual void onDeviceConnectionChanged(int deviceId, bool isConnected) = 0;
    };

    typedef std::function<void(int, bool)> DeviceConnectionCallback;

    class StaticDeviceConnectionListener : public DeviceConnectionListener {
    public:
        virtual void onDeviceConnectionChanged(int deviceId, bool isConnected) override;

        static StaticDeviceConnectionListener* get(const DeviceConnectionCallback& callback) {
            return new StaticDeviceConnectionListener(callback);
        }
    private:
        StaticDeviceConnectionListener(const DeviceConnectionCallback& callback);

        DeviceConnectionCallback mDeviceConnectionCallback;
    };

    template <class T = VirtualController>
    T* getController(int deviceId, const ControllerFactory* factory = nullptr) const {
        std::unique_ptr<VirtualController>& controller = mControllers[deviceId];
        initControllerIfNeeded(deviceId, controller, factory);
        return dynamic_cast<T*>(controller.get());
    }

    template <class T>
    bool isControllerOfType(VirtualController* controller) const {
        return dynamic_cast<T*>(controller) != nullptr;
    }

    template <class T>
    bool isControllerOfType(int deviceId) const {
        return isControllerOfType<T>(mControllers[deviceId].get());
    }

    void reset();

    void registerDeviceConnectionListener(DeviceConnectionListener* listener);
    void unregisterDeviceConnectionListener(DeviceConnectionListener* listener);

    bool isControllerConnected(int deviceId) const {
        return mControllerIds.find(deviceId) != mControllerIds.end();
    }

    const std::set<int>& getConnectedControllers() const {
        return mControllerIds;
    }

    void onControllerDisconnect(int deviceId);

    static ControllerManager* getInstance();

private:
    mutable std::map<int, std::unique_ptr<VirtualController>> mControllers;
    mutable std::set<int> mControllerIds;
    std::set<DeviceConnectionListener*> mDeviceConnectionListeners;

    void notifyDeviceConnectionChanged(int deviceId, bool isConnected) const;
    void initControllerIfNeeded(int deviceId, std::unique_ptr<VirtualController>& controller,
            const ControllerFactory* factory) const;

    static ControllerManager* sInstance;
};

#endif // CONTROLLERMANAGER_H