content: /*
   * Copyright (C) 2018 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.internal.telephony.ims;
  
  import android.content.ComponentName;
  import android.content.Context;
  import android.content.Intent;
  import android.content.ServiceConnection;
  import android.os.IBinder;
  import android.os.RemoteException;
  import android.os.ServiceManager;
  import android.util.Log;
  
  import com.android.ims.internal.IImsFeatureStatusCallback;
  import com.android.ims.internal.IImsService;
  
  /**
   * A compat layer for communicating with older devices that still used the ServiceManager to get
   * the ImsService.
   */
  
  public class ImsServiceControllerStaticCompat extends ImsServiceControllerCompat {
  
      private static final String TAG = "ImsSCStaticCompat";
  
      private static final String IMS_SERVICE_NAME = "ims";
  
      private class ImsDeathRecipient implements IBinder.DeathRecipient {
  
          private ComponentName mComponentName;
          private ServiceConnection mServiceConnection;
  
          ImsDeathRecipient(ComponentName name, ServiceConnection conn) {
              mComponentName = name;
              mServiceConnection = conn;
          }
  
          @Override
          public void binderDied() {
              Log.e(TAG, "ImsService(" + mComponentName + ") died. Restarting...");
              // This is hacky... ImsServiceController uses the traditional service binding procedure,
              // so we have to emulate it when using a persistent service.
              mServiceConnection.onBindingDied(mComponentName);
          }
      }
  
      private IImsService mImsServiceCompat = null;
      private ImsDeathRecipient mImsDeathRecipient = null;
  
      public ImsServiceControllerStaticCompat(Context context, ComponentName componentName,
              ImsServiceController.ImsServiceControllerCallbacks callbacks) {
          super(context, componentName, callbacks);
      }
  
      @Override
      public boolean startBindToService(Intent intent, ImsServiceConnection connection, int flags) {
          IBinder binder = ServiceManager.checkService(IMS_SERVICE_NAME);
  
          if (binder == null) {
              return false;
          }
          // This is a little hacky, but we are going to call the onServiceConnected to "pretend" like
          // bindService has completed here, which will pass the binder to setServiceController and
          // set up all supporting structures.
          ComponentName name = new ComponentName(mContext, ImsServiceControllerStaticCompat.class);
          connection.onServiceConnected(name, binder);
          try {
              mImsDeathRecipient = new ImsDeathRecipient(name, connection);
              binder.linkToDeath(mImsDeathRecipient, 0);
          } catch (RemoteException e) {
              // The binder connection is already dead.. signal to the ImsServiceController to retry.
              mImsDeathRecipient.binderDied();
              mImsDeathRecipient = null;
          }
          return true;
      }
  
      @Override
      protected void setServiceController(IBinder serviceController) {
          if (serviceController == null) {
              // The service controller has been set to null, meaning it has been unbound or died.
              // Unlink if needed.
              if (mImsServiceCompat != null) {
                  mImsServiceCompat.asBinder().unlinkToDeath(mImsDeathRecipient, 0);
              }
              mImsDeathRecipient = null;
          }
          mImsServiceCompat = IImsService.Stub.asInterface(serviceController);
      }
  
      @Override
      // used for add/remove features and cleanup in ImsServiceController.
      protected boolean isServiceControllerAvailable() {
          return mImsServiceCompat != null;
      }
  
      @Override
      protected MmTelInterfaceAdapter getInterface(int slotId, IImsFeatureStatusCallback c) {
          if (mImsServiceCompat == null) {
              Log.w(TAG, "getInterface: IImsService returned null.");
              return null;
          }
          return new ImsServiceInterfaceAdapter(slotId, mImsServiceCompat.asBinder());
      }
  }
  