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.server.location;
  
  import android.content.Context;
  import android.location.GnssMeasurementsEvent;
  import android.location.IGnssMeasurementsListener;
  import android.os.Handler;
  import android.os.RemoteException;
  import android.provider.Settings;
  import android.util.Log;
  
  import com.android.internal.annotations.VisibleForTesting;
  
  /**
   * An base implementation for GPS measurements provider. It abstracts out the responsibility of
   * handling listeners, while still allowing technology specific implementations to be built.
   *
   * @hide
   */
  public abstract class GnssMeasurementsProvider
          extends RemoteListenerHelper<IGnssMeasurementsListener> {
      private static final String TAG = "GnssMeasurementsProvider";
      private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
  
      private final GnssMeasurementProviderNative mNative;
  
      private boolean mIsCollectionStarted;
      private boolean mEnableFullTracking;
  
      protected GnssMeasurementsProvider(Context context, Handler handler) {
          this(context, handler, new GnssMeasurementProviderNative());
      }
  
      @VisibleForTesting
      GnssMeasurementsProvider(
              Context context, Handler handler, GnssMeasurementProviderNative aNative) {
          super(context, handler, TAG);
          mNative = aNative;
      }
  
      void resumeIfStarted() {
          if (DEBUG) {
              Log.d(TAG, "resumeIfStarted");
          }
          if (mIsCollectionStarted) {
              mNative.startMeasurementCollection(mEnableFullTracking);
          }
      }
  
      @Override
      public boolean isAvailableInPlatform() {
          return mNative.isMeasurementSupported();
      }
  
      @Override
      protected int registerWithService() {
          int devOptions = Settings.Secure.getInt(mContext.getContentResolver(),
                  Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 0);
          int fullTrackingToggled = Settings.Global.getInt(mContext.getContentResolver(),
                  Settings.Global.ENABLE_GNSS_RAW_MEAS_FULL_TRACKING, 0);
          boolean enableFullTracking = (devOptions == 1 /* Developer Mode enabled */)
                  && (fullTrackingToggled == 1 /* Raw Measurements Full Tracking enabled */);
          boolean result = mNative.startMeasurementCollection(enableFullTracking);
          if (result) {
              mIsCollectionStarted = true;
              mEnableFullTracking = enableFullTracking;
              return RemoteListenerHelper.RESULT_SUCCESS;
          } else {
              return RemoteListenerHelper.RESULT_INTERNAL_ERROR;
          }
      }
  
      @Override
      protected void unregisterFromService() {
          boolean stopped = mNative.stopMeasurementCollection();
          if (stopped) {
              mIsCollectionStarted = false;
          }
      }
  
      public void onMeasurementsAvailable(final GnssMeasurementsEvent event) {
          foreach((IGnssMeasurementsListener listener, CallerIdentity callerIdentity) -> {
              if (!hasPermission(mContext, callerIdentity)) {
                  logPermissionDisabledEventNotReported(
                          TAG, callerIdentity.mPackageName, "GNSS measurements");
                  return;
              }
              listener.onGnssMeasurementsReceived(event);
          });
      }
  
      /** Handle GNSS capabilities update from the GNSS HAL implementation. */
      public void onCapabilitiesUpdated(boolean isGnssMeasurementsSupported) {
          setSupported(isGnssMeasurementsSupported);
          updateResult();
      }
  
      public void onGpsEnabledChanged() {
          tryUpdateRegistrationWithService();
          updateResult();
      }
  
      @Override
      protected ListenerOperation<IGnssMeasurementsListener> getHandlerOperation(int result) {
          int status;
          switch (result) {
              case RESULT_SUCCESS:
                  status = GnssMeasurementsEvent.Callback.STATUS_READY;
                  break;
              case RESULT_NOT_AVAILABLE:
              case RESULT_NOT_SUPPORTED:
              case RESULT_INTERNAL_ERROR:
                  status = GnssMeasurementsEvent.Callback.STATUS_NOT_SUPPORTED;
                  break;
              case RESULT_NOT_ALLOWED:
                  status = GnssMeasurementsEvent.Callback.STATUS_NOT_ALLOWED;
                  break;
              case RESULT_GPS_LOCATION_DISABLED:
                  status = GnssMeasurementsEvent.Callback.STATUS_LOCATION_DISABLED;
                  break;
              case RESULT_UNKNOWN:
                  return null;
              default:
                  Log.v(TAG, "Unhandled addListener result: " + result);
                  return null;
          }
          return new StatusChangedOperation(status);
      }
  
      private static class StatusChangedOperation
              implements ListenerOperation<IGnssMeasurementsListener> {
          private final int mStatus;
  
          public StatusChangedOperation(int status) {
              mStatus = status;
          }
  
          @Override
          public void execute(IGnssMeasurementsListener listener,
                  CallerIdentity callerIdentity) throws RemoteException {
              listener.onStatusChanged(mStatus);
          }
      }
  
      @VisibleForTesting
      static class GnssMeasurementProviderNative {
          public boolean isMeasurementSupported() {
              return native_is_measurement_supported();
          }
  
          public boolean startMeasurementCollection(boolean enableFullTracking) {
              return native_start_measurement_collection(enableFullTracking);
          }
  
          public boolean stopMeasurementCollection() {
              return native_stop_measurement_collection();
          }
      }
  
      private static native boolean native_is_measurement_supported();
  
      private static native boolean native_start_measurement_collection(boolean enableFullTracking);
  
      private static native boolean native_stop_measurement_collection();
  }
  