content: /**
   * Copyright (C) 2017 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.broadcastradio;
  
  import android.Manifest;
  import android.content.Context;
  import android.content.pm.PackageManager;
  import android.hardware.radio.IAnnouncementListener;
  import android.hardware.radio.ICloseHandle;
  import android.hardware.radio.IRadioService;
  import android.hardware.radio.ITuner;
  import android.hardware.radio.ITunerCallback;
  import android.hardware.radio.RadioManager;
  import android.os.RemoteException;
  import android.util.Slog;
  
  import com.android.server.SystemService;
  import com.android.server.broadcastradio.hal2.AnnouncementAggregator;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Objects;
  import java.util.OptionalInt;
  
  public class BroadcastRadioService extends SystemService {
      private static final String TAG = "BcRadioSrv";
      private static final boolean DEBUG = false;
  
      private final ServiceImpl mServiceImpl = new ServiceImpl();
  
      private final com.android.server.broadcastradio.hal1.BroadcastRadioService mHal1;
      private final com.android.server.broadcastradio.hal2.BroadcastRadioService mHal2;
  
      private final Object mLock = new Object();
      private List<RadioManager.ModuleProperties> mV1Modules = null;
  
      public BroadcastRadioService(Context context) {
          super(context);
  
          mHal1 = new com.android.server.broadcastradio.hal1.BroadcastRadioService();
          mV1Modules = mHal1.loadModules();
          OptionalInt max = mV1Modules.stream().mapToInt(RadioManager.ModuleProperties::getId).max();
          mHal2 = new com.android.server.broadcastradio.hal2.BroadcastRadioService(
                  max.isPresent() ? max.getAsInt() + 1 : 0);
      }
  
      @Override
      public void onStart() {
          publishBinderService(Context.RADIO_SERVICE, mServiceImpl);
      }
  
      private class ServiceImpl extends IRadioService.Stub {
          private void enforcePolicyAccess() {
              if (PackageManager.PERMISSION_GRANTED != getContext().checkCallingPermission(
                      Manifest.permission.ACCESS_BROADCAST_RADIO)) {
                  throw new SecurityException("ACCESS_BROADCAST_RADIO permission not granted");
              }
          }
  
          @Override
          public List<RadioManager.ModuleProperties> listModules() {
              enforcePolicyAccess();
              List<RadioManager.ModuleProperties> modules = new ArrayList<>();
              modules.addAll(mV1Modules);
              modules.addAll(mHal2.listModules());
              return modules;
          }
  
          @Override
          public ITuner openTuner(int moduleId, RadioManager.BandConfig bandConfig,
                  boolean withAudio, ITunerCallback callback) throws RemoteException {
              if (DEBUG) Slog.i(TAG, "Opening module " + moduleId);
              enforcePolicyAccess();
              if (callback == null) {
                  throw new IllegalArgumentException("Callback must not be empty");
              }
              synchronized (mLock) {
                  if (mHal2.hasModule(moduleId)) {
                      return mHal2.openSession(moduleId, bandConfig, withAudio, callback);
                  } else {
                      return mHal1.openTuner(moduleId, bandConfig, withAudio, callback);
                  }
              }
          }
  
          @Override
          public ICloseHandle addAnnouncementListener(int[] enabledTypes,
                  IAnnouncementListener listener) {
              if (DEBUG) {
                  Slog.i(TAG, "Adding announcement listener for " + Arrays.toString(enabledTypes));
              }
              Objects.requireNonNull(enabledTypes);
              Objects.requireNonNull(listener);
              enforcePolicyAccess();
  
              synchronized (mLock) {
                  if (!mHal2.hasAnyModules()) {
                      Slog.i(TAG, "There are no HAL 2.x modules registered");
                      return new AnnouncementAggregator(listener);
                  }
  
                  return mHal2.addAnnouncementListener(enabledTypes, listener);
              }
          }
      }
  }
  