content: /*
   * Copyright (C) 2008 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.bluetooth;
  
  import android.annotation.SdkConstant;
  import android.annotation.SdkConstant.SdkConstantType;
  import android.annotation.UnsupportedAppUsage;
  import android.content.Context;
  import android.os.Binder;
  import android.os.IBinder;
  import android.os.RemoteException;
  import android.util.Log;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * This class provides the APIs to control the Bluetooth Pan
   * Profile.
   *
   * <p>BluetoothPan is a proxy object for controlling the Bluetooth
   * Service via IPC. Use {@link BluetoothAdapter#getProfileProxy} to get
   * the BluetoothPan proxy object.
   *
   * <p>Each method is protected with its appropriate permission.
   *
   * @hide
   */
  public final class BluetoothPan implements BluetoothProfile {
      private static final String TAG = "BluetoothPan";
      private static final boolean DBG = true;
      private static final boolean VDBG = false;
  
      /**
       * Intent used to broadcast the change in connection state of the Pan
       * profile.
       *
       * <p>This intent will have 4 extras:
       * <ul>
       * <li> {@link #EXTRA_STATE} - The current state of the profile. </li>
       * <li> {@link #EXTRA_PREVIOUS_STATE}- The previous state of the profile.</li>
       * <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote device. </li>
       * <li> {@link #EXTRA_LOCAL_ROLE} - Which local role the remote device is
       * bound to. </li>
       * </ul>
       *
       * <p>{@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} can be any of
       * {@link #STATE_DISCONNECTED}, {@link #STATE_CONNECTING},
       * {@link #STATE_CONNECTED}, {@link #STATE_DISCONNECTING}.
       *
       * <p> {@link #EXTRA_LOCAL_ROLE} can be one of {@link #LOCAL_NAP_ROLE} or
       * {@link #LOCAL_PANU_ROLE}
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission to
       * receive.
       */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      public static final String ACTION_CONNECTION_STATE_CHANGED =
              "android.bluetooth.pan.profile.action.CONNECTION_STATE_CHANGED";
  
      /**
       * Extra for {@link #ACTION_CONNECTION_STATE_CHANGED} intent
       * The local role of the PAN profile that the remote device is bound to.
       * It can be one of {@link #LOCAL_NAP_ROLE} or {@link #LOCAL_PANU_ROLE}.
       */
      public static final String EXTRA_LOCAL_ROLE = "android.bluetooth.pan.extra.LOCAL_ROLE";
  
      public static final int PAN_ROLE_NONE = 0;
      /**
       * The local device is acting as a Network Access Point.
       */
      public static final int LOCAL_NAP_ROLE = 1;
      public static final int REMOTE_NAP_ROLE = 1;
  
      /**
       * The local device is acting as a PAN User.
       */
      public static final int LOCAL_PANU_ROLE = 2;
      public static final int REMOTE_PANU_ROLE = 2;
  
      /**
       * Return codes for the connect and disconnect Bluez / Dbus calls.
       *
       * @hide
       */
      public static final int PAN_DISCONNECT_FAILED_NOT_CONNECTED = 1000;
  
      /**
       * @hide
       */
      public static final int PAN_CONNECT_FAILED_ALREADY_CONNECTED = 1001;
  
      /**
       * @hide
       */
      public static final int PAN_CONNECT_FAILED_ATTEMPT_FAILED = 1002;
  
      /**
       * @hide
       */
      public static final int PAN_OPERATION_GENERIC_FAILURE = 1003;
  
      /**
       * @hide
       */
      public static final int PAN_OPERATION_SUCCESS = 1004;
  
      private final Context mContext;
  
      private BluetoothAdapter mAdapter;
      private final BluetoothProfileConnector<IBluetoothPan> mProfileConnector =
              new BluetoothProfileConnector(this, BluetoothProfile.PAN,
                      "BluetoothPan", IBluetoothPan.class.getName()) {
                  @Override
                  public IBluetoothPan getServiceInterface(IBinder service) {
                      return IBluetoothPan.Stub.asInterface(Binder.allowBlocking(service));
                  }
      };
  
  
      /**
       * Create a BluetoothPan proxy object for interacting with the local
       * Bluetooth Service which handles the Pan profile
       */
      @UnsupportedAppUsage
      /*package*/ BluetoothPan(Context context, ServiceListener listener) {
          mAdapter = BluetoothAdapter.getDefaultAdapter();
          mContext = context;
          mProfileConnector.connect(context, listener);
      }
  
      @UnsupportedAppUsage
      /*package*/ void close() {
          if (VDBG) log("close()");
          mProfileConnector.disconnect();
      }
  
      private IBluetoothPan getService() {
          return mProfileConnector.getService();
      }
  
  
      protected void finalize() {
          close();
      }
  
      /**
       * Initiate connection to a profile of the remote bluetooth device.
       *
       * <p> This API returns false in scenarios like the profile on the
       * device is already connected or Bluetooth is not turned on.
       * When this API returns true, it is guaranteed that
       * connection state intent for the profile will be broadcasted with
       * the state. Users can get the connection state of the profile
       * from this intent.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}
       * permission.
       *
       * @param device Remote Bluetooth Device
       * @return false on immediate error, true otherwise
       * @hide
       */
      @UnsupportedAppUsage
      public boolean connect(BluetoothDevice device) {
          if (DBG) log("connect(" + device + ")");
          final IBluetoothPan service = getService();
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.connect(device);
              } catch (RemoteException e) {
                  Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
                  return false;
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return false;
      }
  
      /**
       * Initiate disconnection from a profile
       *
       * <p> This API will return false in scenarios like the profile on the
       * Bluetooth device is not in connected state etc. When this API returns,
       * true, it is guaranteed that the connection state change
       * intent will be broadcasted with the state. Users can get the
       * disconnection state of the profile from this intent.
       *
       * <p> If the disconnection is initiated by a remote device, the state
       * will transition from {@link #STATE_CONNECTED} to
       * {@link #STATE_DISCONNECTED}. If the disconnect is initiated by the
       * host (local) device the state will transition from
       * {@link #STATE_CONNECTED} to state {@link #STATE_DISCONNECTING} to
       * state {@link #STATE_DISCONNECTED}. The transition to
       * {@link #STATE_DISCONNECTING} can be used to distinguish between the
       * two scenarios.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}
       * permission.
       *
       * @param device Remote Bluetooth Device
       * @return false on immediate error, true otherwise
       * @hide
       */
      @UnsupportedAppUsage
      public boolean disconnect(BluetoothDevice device) {
          if (DBG) log("disconnect(" + device + ")");
          final IBluetoothPan service = getService();
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.disconnect(device);
              } catch (RemoteException e) {
                  Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
                  return false;
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return false;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public List<BluetoothDevice> getConnectedDevices() {
          if (VDBG) log("getConnectedDevices()");
          final IBluetoothPan service = getService();
          if (service != null && isEnabled()) {
              try {
                  return service.getConnectedDevices();
              } catch (RemoteException e) {
                  Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
                  return new ArrayList<BluetoothDevice>();
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return new ArrayList<BluetoothDevice>();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
          if (VDBG) log("getDevicesMatchingStates()");
          final IBluetoothPan service = getService();
          if (service != null && isEnabled()) {
              try {
                  return service.getDevicesMatchingConnectionStates(states);
              } catch (RemoteException e) {
                  Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
                  return new ArrayList<BluetoothDevice>();
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return new ArrayList<BluetoothDevice>();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public int getConnectionState(BluetoothDevice device) {
          if (VDBG) log("getState(" + device + ")");
          final IBluetoothPan service = getService();
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.getConnectionState(device);
              } catch (RemoteException e) {
                  Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
                  return BluetoothProfile.STATE_DISCONNECTED;
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return BluetoothProfile.STATE_DISCONNECTED;
      }
  
      @UnsupportedAppUsage
      public void setBluetoothTethering(boolean value) {
          String pkgName = mContext.getOpPackageName();
          if (DBG) log("setBluetoothTethering(" + value + "), calling package:" + pkgName);
          final IBluetoothPan service = getService();
          if (service != null && isEnabled()) {
              try {
                  service.setBluetoothTethering(value, pkgName);
              } catch (RemoteException e) {
                  Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
              }
          }
      }
  
      @UnsupportedAppUsage
      public boolean isTetheringOn() {
          if (VDBG) log("isTetheringOn()");
          final IBluetoothPan service = getService();
          if (service != null && isEnabled()) {
              try {
                  return service.isTetheringOn();
              } catch (RemoteException e) {
                  Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
              }
          }
          return false;
      }
  
      @UnsupportedAppUsage
      private boolean isEnabled() {
          return mAdapter.getState() == BluetoothAdapter.STATE_ON;
      }
  
      @UnsupportedAppUsage
      private static boolean isValidDevice(BluetoothDevice device) {
          return device != null && BluetoothAdapter.checkBluetoothAddress(device.getAddress());
      }
  
      @UnsupportedAppUsage
      private static void log(String msg) {
          Log.d(TAG, msg);
      }
  }
  