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.wifi;
  
  import android.annotation.NonNull;
  import android.net.wifi.WifiConfiguration;
  import android.net.wifi.WifiManager;
  import android.os.Binder;
  import android.os.IBinder;
  import android.os.Message;
  import android.os.Messenger;
  import android.os.RemoteException;
  
  import com.android.internal.util.Preconditions;
  
  /**
   * Tracks information about applications requesting use of the LocalOnlyHotspot.
   *
   * @hide
   */
  public class LocalOnlyHotspotRequestInfo implements IBinder.DeathRecipient {
      static final int HOTSPOT_NO_ERROR = -1;
  
      private final int mPid;
      private final IBinder mBinder;
      private final RequestingApplicationDeathCallback mCallback;
      private final Messenger mMessenger;
  
      /**
       * Callback for use with LocalOnlyHotspot to unregister requesting applications upon death.
       */
      public interface RequestingApplicationDeathCallback {
          /**
           * Called when requesting app has died.
           */
          void onLocalOnlyHotspotRequestorDeath(LocalOnlyHotspotRequestInfo requestor);
      }
  
      LocalOnlyHotspotRequestInfo(@NonNull IBinder binder, @NonNull Messenger messenger,
              @NonNull RequestingApplicationDeathCallback callback) {
          mPid = Binder.getCallingPid();
          mBinder = Preconditions.checkNotNull(binder);
          mMessenger = Preconditions.checkNotNull(messenger);
          mCallback = Preconditions.checkNotNull(callback);
  
          try {
              mBinder.linkToDeath(this, 0);
          } catch (RemoteException e) {
              binderDied();
          }
      }
  
      /**
       * Allow caller to unlink this object from binder death.
       */
      public void unlinkDeathRecipient() {
          mBinder.unlinkToDeath(this, 0);
      }
  
      /**
       * Application requesting LocalOnlyHotspot died
       */
      @Override
      public void binderDied() {
          mCallback.onLocalOnlyHotspotRequestorDeath(this);
      }
  
      /**
       * Send a HOTSPOT_FAILED message to WifiManager for the calling application with the error code.
       *
       * @param reasonCode error code for the message
       *
       * @throws RemoteException
       */
      public void sendHotspotFailedMessage(int reasonCode) throws RemoteException {
          Message message = Message.obtain();
          message.what = WifiManager.HOTSPOT_FAILED;
          message.arg1 = reasonCode;
          mMessenger.send(message);
      }
  
      /**
       * Send a HOTSPOT_STARTED message to WifiManager for the calling application with the config.
       *
       * @param config WifiConfiguration for the callback
       *
       * @throws RemoteException
       */
      public void sendHotspotStartedMessage(WifiConfiguration config) throws RemoteException {
          Message message = Message.obtain();
          message.what = WifiManager.HOTSPOT_STARTED;
          message.obj = config;
          mMessenger.send(message);
      }
  
      /**
       * Send a HOTSPOT_STOPPED message to WifiManager for the calling application.
       *
       * @throws RemoteException
       */
      public void sendHotspotStoppedMessage() throws RemoteException {
          Message message = Message.obtain();
          message.what = WifiManager.HOTSPOT_STOPPED;
          mMessenger.send(message);
      }
  
      public int getPid() {
          return mPid;
      }
  }
  