content: /*
   * Copyright (C) 2014 The Android Open Source Project
   *
   * 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
   */
  
  package com.android.location.provider;
  
  import com.android.internal.util.Preconditions;
  
  import android.hardware.location.IActivityRecognitionHardware;
  import android.hardware.location.IActivityRecognitionHardwareSink;
  import android.os.RemoteException;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashSet;
  
  /**
   * A class that exposes {@link IActivityRecognitionHardware} functionality to unbundled services.
   * @hide
   */
  public final class ActivityRecognitionProvider {
      private final IActivityRecognitionHardware mService;
      private final HashSet<Sink> mSinkSet = new HashSet<>();
  
      // the following constants must remain in sync with activity_recognition.h
  
      public static final String ACTIVITY_IN_VEHICLE = "android.activity_recognition.in_vehicle";
      public static final String ACTIVITY_ON_BICYCLE = "android.activity_recognition.on_bicycle";
      public static final String ACTIVITY_WALKING = "android.activity_recognition.walking";
      public static final String ACTIVITY_RUNNING = "android.activity_recognition.running";
      public static final String ACTIVITY_STILL = "android.activity_recognition.still";
      public static final String ACTIVITY_TILTING = "android.activity_recognition.tilting";
  
      // NOTE: when adding an additional EVENT_TYPE_, EVENT_TYPE_COUNT needs to be updated in
      // android.hardware.location.ActivityRecognitionHardware
      public static final int EVENT_TYPE_FLUSH_COMPLETE = 0;
      public static final int EVENT_TYPE_ENTER = 1;
      public static final int EVENT_TYPE_EXIT = 2;
  
      // end constants activity_recognition.h
  
      /**
       * Used to receive Activity-Recognition events.
       */
      public interface Sink {
          void onActivityChanged(ActivityChangedEvent event);
      }
  
      public ActivityRecognitionProvider(IActivityRecognitionHardware service)
              throws RemoteException {
          Preconditions.checkNotNull(service);
          mService = service;
          mService.registerSink(new SinkTransport());
      }
  
      public String[] getSupportedActivities() throws RemoteException {
          return mService.getSupportedActivities();
      }
  
      public boolean isActivitySupported(String activity) throws RemoteException {
          return mService.isActivitySupported(activity);
      }
  
      public void registerSink(Sink sink) {
          Preconditions.checkNotNull(sink);
          synchronized (mSinkSet) {
              mSinkSet.add(sink);
          }
      }
  
      // TODO: if this functionality is exposed to 3rd party developers, handle unregistration (here
      // and in the service) of all sinks while failing to disable all events
      public void unregisterSink(Sink sink) {
          Preconditions.checkNotNull(sink);
          synchronized (mSinkSet) {
              mSinkSet.remove(sink);
          }
      }
  
      public boolean enableActivityEvent(String activity, int eventType, long reportLatencyNs)
              throws RemoteException {
          return mService.enableActivityEvent(activity, eventType, reportLatencyNs);
      }
  
      public boolean disableActivityEvent(String activity, int eventType) throws RemoteException {
          return mService.disableActivityEvent(activity, eventType);
      }
  
      public boolean flush() throws RemoteException {
          return mService.flush();
      }
  
      private final class SinkTransport extends IActivityRecognitionHardwareSink.Stub {
          @Override
          public void onActivityChanged(android.hardware.location.ActivityChangedEvent event) {
              Collection<Sink> sinks;
              synchronized (mSinkSet) {
                  if (mSinkSet.isEmpty()) {
                      return;
                  }
                  sinks = new ArrayList<>(mSinkSet);
              }
  
              // translate the event from platform internal and GmsCore types
              ArrayList<ActivityRecognitionEvent> gmsEvents = new ArrayList<>();
              for (android.hardware.location.ActivityRecognitionEvent reportingEvent
                      : event.getActivityRecognitionEvents()) {
                  ActivityRecognitionEvent gmsEvent = new ActivityRecognitionEvent(
                          reportingEvent.getActivity(),
                          reportingEvent.getEventType(),
                          reportingEvent.getTimestampNs());
                  gmsEvents.add(gmsEvent);
              }
              ActivityChangedEvent gmsEvent = new ActivityChangedEvent(gmsEvents);
  
              for (Sink sink : sinks) {
                  sink.onActivityChanged(gmsEvent);
              }
          }
      }
  }
  