Android Open Source - security-cam Detection State

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License

The source code is released under:

MIT License

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Java Source Code

package berlin.reiche.securitas.controller.states;
// w  ww  .  j  av a 2  s .  c o m
import android.os.Message;
import android.util.Log;
import berlin.reiche.securitas.Client;
import berlin.reiche.securitas.controller.ClientController;
import berlin.reiche.securitas.controller.tasks.BitmapDownloadTask;
import berlin.reiche.securitas.controller.tasks.DetectionRequest;
import berlin.reiche.securitas.controller.tasks.DetectionRequest.DetectionCommand;
import berlin.reiche.securitas.model.Protocol;
import berlin.reiche.securitas.model.ClientModel.State;

/**
 * Concrete controller state used when the application is currently tracking
 * motion.
 * 
 * @author Konrad Reiche
 * 
 */
public class DetectionState extends ControllerState<State> {

  /**
   * Tag name for logging.
   */
  private static final String TAG = DetectionState.class.getSimpleName();

  /**
   * The latest task for downloading snapshots. The reference is required in
   * order to be able to cancel it if appropriate.
   */
  private BitmapDownloadTask bitmapDownloadTask;

  /**
   * Hides the super class controller field in order to avoid type casting.
   */
  ClientController controller;

  /**
   * Default constructor.
   * 
   * @param controller
   *            controller reference for issuing requests.
   */
  public DetectionState(ClientController controller) {
    super(controller);
    this.controller = controller;
  }

  /**
   * Handles incoming messages from the interface based on the defined
   * {@link Protocol}.
   */
  @Override
  public void handleMessage(Message msg) {
    Protocol request = Protocol.valueOf(msg.what);
    switch (request) {
    case STOP_DETECTION:
      cancelSnapshotDownload();
      requestDetectionStop();
      break;
    case DOWNLOAD_LATEST_SNAPSHOT:
      downloadLatestSnapshot();
      break;
    case DOWNLOAD_MOTION_SNAPSHOT:
      downloadMotionSnapshot(msg.obj.toString());
      break;
    default:
      Log.e(TAG, "Illegal action request: " + request);
      throw new IllegalStateException();
    }
  }

  /**
   * Downloads a specified snapshot.
   * 
   * @param filename
   *            the filename of the snapshot that should be downloaded.
   */
  private void downloadMotionSnapshot(String filename) {
    String uri = Client.getEndpoint();
    uri += Protocol.DOWNLOAD_MOTION_SNAPSHOT.operation + filename;
    bitmapDownloadTask = new BitmapDownloadTask(model, controller);
    bitmapDownloadTask.execute(uri);
  }

  /**
   * Issues a detection stop.
   */
  private void requestDetectionStop() {
    String uri = Client.getEndpoint() + Protocol.STOP_DETECTION.operation;
    controller.setState(new IdleState(controller));
    new DetectionRequest(model, controller, DetectionCommand.STOP)
        .execute(uri);
  }

  /**
   * Downloads the latest snapshot, respectively issues to create a current
   * one.
   */
  private void downloadLatestSnapshot() {
    String uri = Client.getEndpoint();
    uri += Protocol.DOWNLOAD_LATEST_SNAPSHOT.operation;
    bitmapDownloadTask = new BitmapDownloadTask(model, controller);
    bitmapDownloadTask.execute(uri);
  }

  /**
   * Cancel the current snapshot. This method is required if the detection
   * should be turned off in order to cancel the lengthy snapshot requets.
   */
  private void cancelSnapshotDownload() {
    if (bitmapDownloadTask != null) {
      bitmapDownloadTask.cancel(true);
    }
  }

}

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