DroneConnection.java

/*
 * Catroid: An on-device visual programming system for Android devices
 * Copyright (C) 2010-2016 The Catrobat Team
 * (<http://developer.catrobat.org/credits>)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * An additional term exception under section 7 of the GNU Affero
 * General Public License, version 3, is available at
 * http://developer.catrobat.org/license_additional_term
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.catrobat.catroid.drone;

import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;

import com.parrot.freeflight.receivers.DroneConnectionChangeReceiverDelegate;
import com.parrot.freeflight.receivers.DroneConnectionChangedReceiver;
import com.parrot.freeflight.receivers.DroneReadyReceiver;
import com.parrot.freeflight.receivers.DroneReadyReceiverDelegate;
import com.parrot.freeflight.service.DroneControlService;

import org.catrobat.catroid.stage.StageResourceInterface;

public class DroneConnection implements StageResourceInterface, DroneReadyReceiverDelegate,
		DroneConnectionChangeReceiverDelegate {

	private Context context = null;

	private static final String TAG = DroneConnection.class.getSimpleName();

	protected DroneControlService droneControlService = null;
	private BroadcastReceiver droneReadyReceiver = null;
	private DroneConnectionChangedReceiver droneConnectionChangeReceiver = null;

	public DroneConnection(Context context) {
		this.context = context;
	}

	@Override
	public void initialise() throws RuntimeException {
		//TODO Drone: process return value
		prepareDroneResources();
	}

	private void prepareDroneResources() throws RuntimeException {
		Log.d(TAG, "prepareResources()");
		droneReadyReceiver = new DroneReadyReceiver(this);
		droneConnectionChangeReceiver = new DroneConnectionChangedReceiver(this);

		helpBindDroneService();
	}

	@Override
	public void start() {
		if (droneControlService != null) {
			Log.d(TAG, "droneControlService .. onResume");
			droneControlService.resume();
			DroneServiceWrapper.getInstance().setDroneService(droneControlService);
		}
		LocalBroadcastManager manager = LocalBroadcastManager.getInstance(context);
		manager.registerReceiver(droneReadyReceiver, new IntentFilter(DroneControlService.DRONE_STATE_READY_ACTION));
		manager.registerReceiver(droneConnectionChangeReceiver, new IntentFilter(
				DroneControlService.DRONE_CONNECTION_CHANGED_ACTION));
	}

	@Override
	public void pause() {
		if (droneControlService != null) {
			droneControlService.pause();
			DroneServiceWrapper.getInstance().setDroneService(null);
		}
		LocalBroadcastManager manager = LocalBroadcastManager.getInstance(context);
		manager.unregisterReceiver(droneReadyReceiver);
		manager.unregisterReceiver(droneConnectionChangeReceiver);
	}

	@Override
	public void destroy() {
		helpUnbindDroneService();
	}

	private void onDroneServiceConnected(IBinder service) {
		Log.d(TAG, "onDroneServiceConnected");
		droneControlService = ((DroneControlService.LocalBinder) service).getService();
		DroneServiceWrapper.getInstance().setDroneService(droneControlService);
		droneControlService.resume();
		droneControlService.requestDroneStatus();
		droneControlService.requestConfigUpdate();

		Log.d(TAG, "DroneServiceConnection");
	}

	private ServiceConnection droneServiceConnection = new ServiceConnection() {

		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			Log.d(TAG, "Drone Connected");
			onDroneServiceConnected(service);
		}

		@Override
		public void onServiceDisconnected(ComponentName name) {
			Log.d(TAG, "Drone Disconnected");
			droneControlService = null;
		}
	};

	private void helpUnbindDroneService() {
		if (droneControlService != null) {
			context.unbindService(droneServiceConnection);
			droneServiceConnection = null;
			droneControlService = null;
		}
	}

	private void helpBindDroneService() throws RuntimeException {
		if (droneControlService == null
				&& !context.bindService(new Intent(context, DroneControlService.class),
				this.droneServiceConnection, Context.BIND_AUTO_CREATE)) {
			throw new RuntimeException("Connection to the drone not successful");
		}
	}

	@Override
	public void onDroneReady() {
		Log.d(TAG, "onDroneReady");
	}

	@Override
	public void onDroneConnected() {
		Log.d(TAG, "onDroneConnected");
		droneControlService.requestConfigUpdate();
	}

	@Override
	public void onDroneDisconnected() {
		Log.d(TAG, "onDroneDisconnected");
		//Nothing to do here
	}
}