content: /*
   * Copyright (C) 2006 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 android.os;
  
  import android.annotation.UnsupportedAppUsage;
  import java.util.ArrayList;
  
  
  /**
   * Native implementation of the service manager.  Most clients will only
   * care about getDefault() and possibly asInterface().
   * @hide
   */
  public abstract class ServiceManagerNative extends Binder implements IServiceManager
  {
      /**
       * Cast a Binder object into a service manager interface, generating
       * a proxy if needed.
       */
      @UnsupportedAppUsage
      static public IServiceManager asInterface(IBinder obj)
      {
          if (obj == null) {
              return null;
          }
          IServiceManager in =
              (IServiceManager)obj.queryLocalInterface(descriptor);
          if (in != null) {
              return in;
          }
  
          return new ServiceManagerProxy(obj);
      }
  
      public ServiceManagerNative()
      {
          attachInterface(this, descriptor);
      }
  
      public boolean onTransact(int code, Parcel data, Parcel reply, int flags)
      {
          try {
              switch (code) {
                  case IServiceManager.GET_SERVICE_TRANSACTION: {
                      data.enforceInterface(IServiceManager.descriptor);
                      String name = data.readString();
                      IBinder service = getService(name);
                      reply.writeStrongBinder(service);
                      return true;
                  }
  
                  case IServiceManager.CHECK_SERVICE_TRANSACTION: {
                      data.enforceInterface(IServiceManager.descriptor);
                      String name = data.readString();
                      IBinder service = checkService(name);
                      reply.writeStrongBinder(service);
                      return true;
                  }
  
                  case IServiceManager.ADD_SERVICE_TRANSACTION: {
                      data.enforceInterface(IServiceManager.descriptor);
                      String name = data.readString();
                      IBinder service = data.readStrongBinder();
                      boolean allowIsolated = data.readInt() != 0;
                      int dumpPriority = data.readInt();
                      addService(name, service, allowIsolated, dumpPriority);
                      return true;
                  }
  
                  case IServiceManager.LIST_SERVICES_TRANSACTION: {
                      data.enforceInterface(IServiceManager.descriptor);
                      int dumpPriority = data.readInt();
                      String[] list = listServices(dumpPriority);
                      reply.writeStringArray(list);
                      return true;
                  }
  
                  case IServiceManager.SET_PERMISSION_CONTROLLER_TRANSACTION: {
                      data.enforceInterface(IServiceManager.descriptor);
                      IPermissionController controller =
                              IPermissionController.Stub.asInterface(
                                      data.readStrongBinder());
                      setPermissionController(controller);
                      return true;
                  }
              }
          } catch (RemoteException e) {
          }
  
          return false;
      }
  
      public IBinder asBinder()
      {
          return this;
      }
  }
  
  class ServiceManagerProxy implements IServiceManager {
      public ServiceManagerProxy(IBinder remote) {
          mRemote = remote;
      }
  
      public IBinder asBinder() {
          return mRemote;
      }
  
      @UnsupportedAppUsage
      public IBinder getService(String name) throws RemoteException {
          Parcel data = Parcel.obtain();
          Parcel reply = Parcel.obtain();
          data.writeInterfaceToken(IServiceManager.descriptor);
          data.writeString(name);
          mRemote.transact(GET_SERVICE_TRANSACTION, data, reply, 0);
          IBinder binder = reply.readStrongBinder();
          reply.recycle();
          data.recycle();
          return binder;
      }
  
      public IBinder checkService(String name) throws RemoteException {
          Parcel data = Parcel.obtain();
          Parcel reply = Parcel.obtain();
          data.writeInterfaceToken(IServiceManager.descriptor);
          data.writeString(name);
          mRemote.transact(CHECK_SERVICE_TRANSACTION, data, reply, 0);
          IBinder binder = reply.readStrongBinder();
          reply.recycle();
          data.recycle();
          return binder;
      }
  
      public void addService(String name, IBinder service, boolean allowIsolated, int dumpPriority)
              throws RemoteException {
          Parcel data = Parcel.obtain();
          Parcel reply = Parcel.obtain();
          data.writeInterfaceToken(IServiceManager.descriptor);
          data.writeString(name);
          data.writeStrongBinder(service);
          data.writeInt(allowIsolated ? 1 : 0);
          data.writeInt(dumpPriority);
          mRemote.transact(ADD_SERVICE_TRANSACTION, data, reply, 0);
          reply.recycle();
          data.recycle();
      }
  
      public String[] listServices(int dumpPriority) throws RemoteException {
          ArrayList<String> services = new ArrayList<String>();
          int n = 0;
          while (true) {
              Parcel data = Parcel.obtain();
              Parcel reply = Parcel.obtain();
              data.writeInterfaceToken(IServiceManager.descriptor);
              data.writeInt(n);
              data.writeInt(dumpPriority);
              n++;
              try {
                  boolean res = mRemote.transact(LIST_SERVICES_TRANSACTION, data, reply, 0);
                  if (!res) {
                      break;
                  }
              } catch (RuntimeException e) {
                  // The result code that is returned by the C++ code can
                  // cause the call to throw an exception back instead of
                  // returning a nice result...  so eat it here and go on.
                  break;
              }
              services.add(reply.readString());
              reply.recycle();
              data.recycle();
          }
          String[] array = new String[services.size()];
          services.toArray(array);
          return array;
      }
  
      public void setPermissionController(IPermissionController controller)
              throws RemoteException {
          Parcel data = Parcel.obtain();
          Parcel reply = Parcel.obtain();
          data.writeInterfaceToken(IServiceManager.descriptor);
          data.writeStrongBinder(controller.asBinder());
          mRemote.transact(SET_PERMISSION_CONTROLLER_TRANSACTION, data, reply, 0);
          reply.recycle();
          data.recycle();
      }
  
      @UnsupportedAppUsage
      private IBinder mRemote;
  }
  