/**
    *  BlueCove - Java library for Bluetooth
    *  Copyright (C) 2006-2008 Vlad Skarzhevskyy
    *
    *  Licensed to the Apache Software Foundation (ASF) under one
    *  or more contributor license agreements.  See the NOTICE file
    *  distributed with this work for additional information
    *  regarding copyright ownership.  The ASF licenses this file
    *  to you 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.
   *
   *  @author vlads
   *  @version $Id: RemoteDeviceHelper.java 2476 2008-12-01 17:41:59Z skarzhevskyy $
   */
  package com.intel.bluetooth;
  
  import java.io.IOException;
  import java.util.Enumeration;
  import java.util.Hashtable;
  import java.util.Vector;
  
  import javax.bluetooth.BluetoothStateException;
  import javax.bluetooth.DiscoveryAgent;
  import javax.bluetooth.RemoteDevice;
  import javax.bluetooth.ServiceRecord;
  import javax.microedition.io.Connection;
  
  import com.intel.bluetooth.WeakVectorFactory.WeakVector;
  
  /**
   * Implementation of RemoteDevice.
   *
   * Instance of RemoteDevice can be created by User. BlueCove should use only RemoteDeviceHelper class to create
   * RemoteDevice instances.
   *
   * <p>
   * <b><u>Your application should not use this class directly.</u></b>
   *
   * The exceptions are authenticate(RemoteDevice device, String passkey) and removeAuthentication(RemoteDevice device).
   */
  public abstract class RemoteDeviceHelper {
  
  	private static class RemoteDeviceWithExtendedInfo extends RemoteDevice {
  
  		String name;
  
  		long addressLong;
  
  		BluetoothStack bluetoothStack;
  
  		private Hashtable stackAttributes;
  
  		private boolean paired;
  
  		/**
  		 * Connections can be discarded by the garbage collector.
  		 */
  		private WeakVector connections;
  
  		private RemoteDeviceWithExtendedInfo(BluetoothStack bluetoothStack, long address, String name) {
  			super(RemoteDeviceHelper.getBluetoothAddress(address));
  			this.bluetoothStack = bluetoothStack;
  			this.name = name;
  			this.addressLong = address;
  		}
  
  		private void addConnection(Object connection) {
  			synchronized (this) {
  				if (connections == null) {
  					connections = WeakVectorFactory.createWeakVector();
  				}
  			}
  			synchronized (connections) {
  				connections.addElement(connection);
  				DebugLog.debug("connection open, open now", connections.size());
  			}
  		}
  
  		private void removeConnection(Object connection) {
  			if (connections == null) {
  				return;
  			}
  			synchronized (connections) {
  				connections.removeElement(connection);
  				DebugLog.debug("connection closed, open now", connections.size());
  			}
  		}
  
  		void shutdownConnections() {
 			if (!hasConnections()) {
 				return;
 			}
 			Vector c2shutdown = new Vector();
 			synchronized (connections) {
 				c2shutdown = Utils.clone(connections.elements());
 			}
 			for (Enumeration en = c2shutdown.elements(); en.hasMoreElements();) {
 				BluetoothConnectionAccess c = (BluetoothConnectionAccess) en.nextElement();
 				try {
 					c.shutdown();
 				} catch (IOException e) {
 					DebugLog.debug("connection shutdown", e);
 				}
 			}
 			synchronized (connections) {
 				connections.removeAllElements();
 			}
 		}
 
 		private void setStackAttributes(Object key, Object value) {
 			if (stackAttributes == null) {
 				stackAttributes = new Hashtable();
 			}
 			if (value == null) {
 				stackAttributes.remove(key);
 			} else {
 				stackAttributes.put(key, value);
 			}
 		}
 
 		private Object getStackAttributes(Object key) {
 			if (stackAttributes == null) {
 				return null;
 			}
 			return stackAttributes.get(key);
 		}
 
 		public String toString() {
 			return super.getBluetoothAddress();
 		}
 
 		int connectionsCount() {
 			if (connections == null) {
 				return 0;
 			}
 			return connections.size();
 		}
 
 		boolean hasConnections() {
 			return (connectionsCount() != 0);
 		}
 
 		/**
 		 * @see javax.bluetooth.RemoteDevice#authenticate()
 		 */
 		public boolean authenticate() throws IOException {
 			if (!hasConnections()) {
 				throw new IOException("No open connections to this RemoteDevice");
 			}
 			if (this.isAuthenticated()) {
 				// has previously been authenticated
 				return true;
 			}
 			boolean authenticated = bluetoothStack.authenticateRemoteDevice(addressLong);
 			paired = authenticated;
 			if (authenticated) {
 				updateConnectionMarkAuthenticated();
 			}
 			return authenticated;
 		}
 
 		/**
 		 * @see com.intel.bluetooth.RemoteDeviceHelper#authenticateRemoteDevice(RemoteDevice, java.lang.String)
 		 */
 		boolean authenticate(String passkey) throws IOException {
 			boolean authenticated = bluetoothStack.authenticateRemoteDevice(addressLong, passkey);
 			paired = authenticated;
 			if (authenticated) {
 				updateConnectionMarkAuthenticated();
 			}
 			return authenticated;
 		}
 
 		void removeAuthentication() throws IOException {
 			bluetoothStack.removeAuthenticationWithRemoteDevice(addressLong);
 			paired = false;
 		}
 
 		private void updateConnectionMarkAuthenticated() {
 			if (connections == null) {
 				return;
 			}
 			synchronized (connections) {
 				for (Enumeration en = connections.elements(); en.hasMoreElements();) {
 					BluetoothConnectionAccess c = (BluetoothConnectionAccess) en.nextElement();
 					c.markAuthenticated();
 				}
 			}
 		}
 
 		/**
 		 * Determines if this RemoteDevice should be allowed to continue to access the local service provided by the
 		 * Connection.
 		 *
 		 * @see javax.bluetooth.RemoteDevice#authorize(javax.microedition.io.Connection)
 		 */
 		public boolean authorize(Connection conn) throws IOException {
 			if (!(conn instanceof BluetoothConnectionAccess)) {
 				throw new IllegalArgumentException("Connection is not a Bluetooth connection");
 			}
 			if (((BluetoothConnectionAccess) conn).isClosed()) {
 				throw new IOException("Connection is already closed");
 			}
 			if (!(conn instanceof BluetoothServerConnection)) {
 				throw new IllegalArgumentException("Connection is not an incomming Bluetooth connection");
 			}
 			return isTrustedDevice() || isAuthenticated();
 		}
 
 		/**
 		 *
 		 * @see javax.bluetooth.RemoteDevice#isAuthorized(javax.microedition.io.Connection)
 		 */
 		public boolean isAuthorized(Connection conn) throws IOException {
 			if (!(conn instanceof BluetoothConnectionAccess)) {
 				throw new IllegalArgumentException("Connection is not a Bluetooth connection");
 			}
 			if (((BluetoothConnectionAccess) conn).isClosed()) {
 				throw new IOException("Connection is already closed");
 			}
 			if (!(conn instanceof BluetoothServerConnection)) {
 				throw new IllegalArgumentException("Connection is not an incomming Bluetooth connection");
 			}
 			return isTrustedDevice();
 		}
 
 		/**
 		 * Attempts to turn encryption on or off for an existing connection.
 		 *
 		 * @see javax.bluetooth.RemoteDevice#encrypt(javax.microedition.io.Connection, boolean)
 		 */
 		public boolean encrypt(Connection conn, boolean on) throws IOException {
 			if (!(conn instanceof BluetoothConnectionAccess)) {
 				throw new IllegalArgumentException("Connection is not a Bluetooth connection");
 			}
 			if (((BluetoothConnectionAccess) conn).getRemoteAddress() != this.addressLong) {
 				throw new IllegalArgumentException("Connection is not to this device");
 			}
 			if ((((BluetoothConnectionAccess) conn).getSecurityOpt() == ServiceRecord.AUTHENTICATE_ENCRYPT) == on) {
 				return true;
 			}
 			return ((BluetoothConnectionAccess) conn).encrypt(this.addressLong, on);
 		}
 
 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see javax.bluetooth.RemoteDevice#isAuthenticated()
 		 */
 		public boolean isAuthenticated() {
 			if (!hasConnections()) {
 				DebugLog.debug("no connections, Authenticated = false");
 				return false;
 			}
 			Boolean authenticated = bluetoothStack.isRemoteDeviceAuthenticated(addressLong);
 			if (authenticated != null) {
 				return authenticated.booleanValue();
 			}
 			synchronized (connections) {
 				// Find first authenticated connection
 				for (Enumeration en = connections.elements(); en.hasMoreElements();) {
 					BluetoothConnectionAccess c = (BluetoothConnectionAccess) en.nextElement();
 					if (c.getSecurityOpt() != ServiceRecord.NOAUTHENTICATE_NOENCRYPT) {
 						return true;
 					}
 				}
 			}
 			return false;
 		}
 
 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see javax.bluetooth.RemoteDevice#isEncrypted()
 		 */
 		public boolean isEncrypted() {
 			if (!hasConnections()) {
 				return false;
 			}
 			synchronized (connections) {
 				// Find first encrypted connection
 				for (Enumeration en = connections.elements(); en.hasMoreElements();) {
 					BluetoothConnectionAccess c = (BluetoothConnectionAccess) en.nextElement();
 					if (c.getSecurityOpt() == ServiceRecord.AUTHENTICATE_ENCRYPT) {
 						return true;
 					}
 				}
 			}
 			return false;
 		}
 
 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see javax.bluetooth.RemoteDevice#isTrustedDevice()
 		 */
 		public boolean isTrustedDevice() {
 			Boolean trusted = bluetoothStack.isRemoteDeviceTrusted(addressLong);
 			if (trusted == null) {
 				return paired;
 			} else {
 				return trusted.booleanValue();
 			}
 		}
 	}
 
 	private static Hashtable stackDevicesCashed = new Hashtable();
 
 	private RemoteDeviceHelper() {
 
 	}
 
 	private static synchronized Hashtable devicesCashed(BluetoothStack bluetoothStack) {
 		Hashtable devicesCashed = (Hashtable) stackDevicesCashed.get(bluetoothStack);
 		if (devicesCashed == null) {
 			devicesCashed = new Hashtable();
 			stackDevicesCashed.put(bluetoothStack, devicesCashed);
 		}
 		return devicesCashed;
 	}
 
 	private static RemoteDeviceWithExtendedInfo getCashedDeviceWithExtendedInfo(BluetoothStack bluetoothStack,
 			long address) {
 		Object key = new Long(address);
 		return (RemoteDeviceWithExtendedInfo) devicesCashed(bluetoothStack).get(key);
 	}
 
 	static RemoteDevice getCashedDevice(BluetoothStack bluetoothStack, long address) {
 		return getCashedDeviceWithExtendedInfo(bluetoothStack, address);
 	}
 
 	static RemoteDevice createRemoteDevice(BluetoothStack bluetoothStack, long address, String name, boolean paired) {
 		RemoteDeviceWithExtendedInfo dev = getCashedDeviceWithExtendedInfo(bluetoothStack, address);
 		if (dev == null) {
 			Object saveID = BlueCoveImpl.getCurrentThreadBluetoothStackID();
 			try {
 				BlueCoveImpl.setThreadBluetoothStack(bluetoothStack);
 				dev = new RemoteDeviceWithExtendedInfo(bluetoothStack, address, name);
 			} finally {
 				if (saveID != null) {
 					BlueCoveImpl.setThreadBluetoothStackID(saveID);
 				}
 			}
 			devicesCashed(bluetoothStack).put(new Long(address), dev);
 			DebugLog.debug0x("new devicesCashed", address);
 		} else if (!Utils.isStringSet(dev.name)) {
 			// New name found
 			dev.name = name;
 		} else if (Utils.isStringSet(name)) {
 			// Update name if changed
 			dev.name = name;
 		}
 		if (paired) {
 			dev.paired = paired;
 		}
 		return dev;
 	}
 
 	private static BluetoothStack getBluetoothStack() throws RuntimeException {
 		try {
 			return BlueCoveImpl.instance().getBluetoothStack();
 		} catch (BluetoothStateException e) {
 			throw (RuntimeException) UtilsJavaSE.initCause(new RuntimeException("Can't initialize bluetooth support"),
 					e);
 		}
 	}
 
 	private static RemoteDeviceWithExtendedInfo remoteDeviceImpl(RemoteDevice device) {
 		return (RemoteDeviceWithExtendedInfo) createRemoteDevice(null, device);
 	}
 
 	static RemoteDevice createRemoteDevice(BluetoothStack bluetoothStack, RemoteDevice device) throws RuntimeException {
 		if (device instanceof RemoteDeviceWithExtendedInfo) {
 			return device;
 		} else {
 			if (bluetoothStack == null) {
 				bluetoothStack = getBluetoothStack();
 			}
 			return createRemoteDevice(bluetoothStack, getAddress(device), null, false);
 		}
 	}
 
 	public static String getFriendlyName(RemoteDevice device, long address, boolean alwaysAsk) throws IOException {
 		String name = null;
 		if (!(device instanceof RemoteDeviceWithExtendedInfo)) {
 			device = createRemoteDevice(null, device);
 		}
 		name = ((RemoteDeviceWithExtendedInfo) device).name;
 		if (alwaysAsk || (!Utils.isStringSet(name))) {
 			name = ((RemoteDeviceWithExtendedInfo) device).bluetoothStack.getRemoteDeviceFriendlyName(address);
 			if (Utils.isStringSet(name)) {
 				((RemoteDeviceWithExtendedInfo) device).name = name;
 			} else {
 				throw new IOException("Can't query remote device");
 			}
 		}
 		return name;
 	}
 
 	/**
 	 * @see javax.bluetooth.RemoteDevice#getRemoteDevice(Connection)
 	 */
 	public static RemoteDevice getRemoteDevice(Connection conn) throws IOException {
 		if (!(conn instanceof BluetoothConnectionAccess)) {
 			throw new IllegalArgumentException("Not a Bluetooth connection " + conn.getClass().getName());
 		}
 		return createRemoteDevice(((BluetoothConnectionAccess) conn).getBluetoothStack(),
 				((BluetoothConnectionAccess) conn).getRemoteAddress(), null, false);
 	}
 
 	/**
 	 * (non-Javadoc)
 	 *
 	 * @see javax.bluetooth.DiscoveryAgent#retrieveDevices(int)
 	 */
 	public static RemoteDevice[] retrieveDevices(BluetoothStack bluetoothStack, int option) {
 		if ((option != DiscoveryAgent.PREKNOWN) && (option != DiscoveryAgent.CACHED)) {
 			throw new IllegalArgumentException("invalid option");
 		}
 		RemoteDevice[] impl = bluetoothStack.retrieveDevices(option);
 		if (impl != null) {
 			if (impl.length == 0) {
 				// Spec: null if no devices meet the criteria
 				return null;
 			} else {
 				return impl;
 			}
 		}
 
 		Hashtable devicesCashed = devicesCashed(bluetoothStack);
 		switch (option) {
 		case DiscoveryAgent.PREKNOWN:
 			if (devicesCashed.size() == 0) {
 				// Spec: null if no devices meet the criteria
 				return null;
 			}
 			Vector devicesPaired = new Vector();
 			for (Enumeration en = devicesCashed.elements(); en.hasMoreElements();) {
 				RemoteDeviceWithExtendedInfo d = (RemoteDeviceWithExtendedInfo) en.nextElement();
 				if (d.isTrustedDevice()) {
 					devicesPaired.addElement(d);
 				}
 			}
 			if (devicesPaired.size() == 0) {
 				// Spec: null if no devices meet the criteria
 				return null;
 			}
 			return remoteDeviceListToArray(devicesPaired);
 		case DiscoveryAgent.CACHED:
 			if (devicesCashed.size() == 0) {
 				// Spec: null if no devices meet the criteria
 				return null;
 			}
 			RemoteDevice[] devices = new RemoteDevice[devicesCashed.size()];
 			int k = 0;
 			for (Enumeration en = devicesCashed.elements(); en.hasMoreElements();) {
 				devices[k++] = (RemoteDevice) en.nextElement();
 			}
 			return devices;
 		default:
 			throw new IllegalArgumentException("invalid option");
 		}
 	}
 
 	static RemoteDevice[] remoteDeviceListToArray(Vector devices) {
 		RemoteDevice[] devicesArray = new RemoteDevice[devices.size()];
 		int i = 0;
 		for (Enumeration en = devices.elements(); en.hasMoreElements();) {
 			devicesArray[i++] = (RemoteDevice) en.nextElement();
 		}
 		return devicesArray;
 	}
 
 	/**
 	 * Count total number of open connections to all devices.
 	 *
 	 * @return number of connections
 	 */
 	public static int openConnections() {
 		int c = 0;
 		Hashtable devicesCashed = devicesCashed(getBluetoothStack());
 		synchronized (devicesCashed) {
 			for (Enumeration en = devicesCashed.elements(); en.hasMoreElements();) {
 				c += ((RemoteDeviceWithExtendedInfo) en.nextElement()).connectionsCount();
 			}
 		}
 		return c;
 	}
 
 	/**
 	 * Count number of open connections to or from specific device.
 	 *
 	 * @return number of connections
 	 */
 	public static int openConnections(long address) {
 		RemoteDeviceWithExtendedInfo dev = getCashedDeviceWithExtendedInfo(getBluetoothStack(), address);
 		if (dev == null) {
 			return 0;
 		}
 		return dev.connectionsCount();
 	}
 
 	/**
 	 * Count number of device that have open connections to or from them.
 	 *
 	 * @return number of connections
 	 */
 	public static int connectedDevices() {
 		int c = 0;
 		Hashtable devicesCashed = devicesCashed(getBluetoothStack());
 		synchronized (devicesCashed) {
 			for (Enumeration en = devicesCashed.elements(); en.hasMoreElements();) {
 				if (((RemoteDeviceWithExtendedInfo) en.nextElement()).hasConnections()) {
 					c++;
 				}
 			}
 		}
 		return c;
 	}
 
 	static void shutdownConnections(BluetoothStack bluetoothStack) {
 		Hashtable devicesCashed = devicesCashed(bluetoothStack);
 		synchronized (devicesCashed) {
 			for (Enumeration en = devicesCashed.elements(); en.hasMoreElements();) {
 				((RemoteDeviceWithExtendedInfo) en.nextElement()).shutdownConnections();
 			}
 		}
 	}
 
 	public static String formatBluetoothAddress(String address) {
 		String s = address.toUpperCase();
 		return "000000000000".substring(s.length()) + s;
 	}
 
 	public static String getBluetoothAddress(long address) {
 		return formatBluetoothAddress(Utils.toHexString(address));
 	}
 
 	public static long getAddress(String bluetoothAddress) {
 		if (bluetoothAddress.indexOf('-') != -1) {
 			throw new IllegalArgumentException("Illegal bluetoothAddress {" + bluetoothAddress + "}");
 		}
 		try {
 			return Long.parseLong(bluetoothAddress, 16);
 		} catch (NumberFormatException e) {
 			throw new IllegalArgumentException("Illegal bluetoothAddress {" + bluetoothAddress + "}; should be hex number");
 		}
 	}
 
 	static long getAddress(RemoteDevice device) {
 		if (device instanceof RemoteDeviceWithExtendedInfo) {
 			return ((RemoteDeviceWithExtendedInfo) device).addressLong;
 		} else {
 			return getAddress(device.getBluetoothAddress());
 		}
 	}
 
 	static void setStackAttributes(BluetoothStack bluetoothStack, RemoteDevice device, Object key, Object value) {
 		RemoteDeviceWithExtendedInfo devInfo = (RemoteDeviceWithExtendedInfo) createRemoteDevice(bluetoothStack, device);
 		devInfo.setStackAttributes(key, value);
 	}
 
 	static Object getStackAttributes(BluetoothStack bluetoothStack, RemoteDevice device, Object key) {
 		RemoteDeviceWithExtendedInfo devInfo = null;
 		if (device instanceof RemoteDeviceWithExtendedInfo) {
 			devInfo = (RemoteDeviceWithExtendedInfo) device;
 		} else {
 			devInfo = getCashedDeviceWithExtendedInfo(bluetoothStack, getAddress(device));
 		}
 
 		if (devInfo != null) {
 			return devInfo.getStackAttributes(key);
 		} else {
 			return null;
 		}
 	}
 
 	static void connected(BluetoothConnectionAccess connection) throws IOException {
 		RemoteDeviceWithExtendedInfo device = (RemoteDeviceWithExtendedInfo) getRemoteDevice((Connection) connection);
 		connection.setRemoteDevice(device);
 		device.addConnection(connection);
 	}
 
 	static void disconnected(BluetoothConnectionAccess connection) {
 		RemoteDevice d = connection.getRemoteDevice();
 		if (d != null) {
 			((RemoteDeviceWithExtendedInfo) d).removeConnection(connection);
 			connection.setRemoteDevice(null);
 		}
 	}
 
 	/**
 	 * Attempts to authenticate RemoteDevice. Return <code>false</code> if the stack does not support authentication.
 	 *
 	 * @see javax.bluetooth.RemoteDevice#authenticate()
 	 */
 	public static boolean authenticate(RemoteDevice device) throws IOException {
 		return remoteDeviceImpl(device).authenticate();
 	}
 
 	/**
 	 *
 	 * Sends an authentication request to a remote Bluetooth device. Non JSR-82, Return <code>false</code> if the stack
 	 * does not support authentication.
 	 * <p>
 	 * <b>PUBLIC JSR-82 extension</b>
 	 *
 	 * @param device
 	 *            Remote Device
 	 * @param passkey
 	 *            A Personal Identification Number (PIN) to be used for device authentication.
 	 * @return <code>true</code> if authentication is successful; otherwise <code>false</code>
 	 * @throws IOException
 	 *             if there are error during authentication.
 	 */
 	public static boolean authenticate(RemoteDevice device, String passkey) throws IOException {
 		return remoteDeviceImpl(device).authenticate(passkey);
 	}
 
 	/**
 	 *
 	 * Removes authentication between local and remote bluetooth devices. Non JSR-82.
 	 * <p>
 	 * <b>PUBLIC JSR-82 extension</b>
 	 *
 	 * @param device
 	 *            Remote Device
 	 *
 	 * @throws IOException
 	 *             if there are errors or not implemented.
 	 */
 	public static void removeAuthentication(RemoteDevice device) throws IOException {
 		remoteDeviceImpl(device).removeAuthentication();
 	}
 
 	/**
 	 * Determines if this RemoteDevice should be allowed to continue to access the local service provided by the
 	 * Connection.
 	 *
 	 * @see javax.bluetooth.RemoteDevice#authorize(javax.microedition.io.Connection)
 	 */
 	public static boolean authorize(RemoteDevice device, Connection conn) throws IOException {
 		return remoteDeviceImpl(device).authorize(conn);
 	}
 
 	/**
 	 * Attempts to turn encryption on or off for an existing connection.
 	 *
 	 * @see javax.bluetooth.RemoteDevice#encrypt(javax.microedition.io.Connection, boolean)
 	 */
 	public static boolean encrypt(RemoteDevice device, Connection conn, boolean on) throws IOException {
 		return remoteDeviceImpl(device).encrypt(conn, on);
 	}
 
 	/**
 	 * Determines if this <code>RemoteDevice</code> has been authenticated.
 	 * <P>
 	 * A device may have been authenticated by this application or another application. Authentication applies to an ACL
 	 * link between devices and not on a specific L2CAP, RFCOMM, or OBEX connection. Therefore, if
 	 * <code>authenticate()</code> is performed when an L2CAP connection is made to device A, then
 	 * <code>isAuthenticated()</code> may return <code>true</code> when tested as part of making an RFCOMM connection to
 	 * device A.
 	 *
 	 * @return <code>true</code> if this <code>RemoteDevice</code> has previously been authenticated; <code>false</code>
 	 *         if it has not been authenticated or there are no open connections between the local device and this
 	 *         <code>RemoteDevice</code>
 	 */
 	public static boolean isAuthenticated(RemoteDevice device) {
 		return remoteDeviceImpl(device).isAuthenticated();
 	}
 
 	public static boolean isAuthorized(RemoteDevice device, Connection conn) throws IOException {
 		return remoteDeviceImpl(device).isAuthorized(conn);
 	}
 
 	/**
 	 * Determines if data exchanges with this <code>RemoteDevice</code> are currently being encrypted.
 	 * <P>
 	 * Encryption may have been previously turned on by this or another application. Encryption applies to an ACL link
 	 * between devices and not on a specific L2CAP, RFCOMM, or OBEX connection. Therefore, if <code>encrypt()</code> is
 	 * performed with the <code>on</code> parameter set to <code>true</code> when an L2CAP connection is made to device
 	 * A, then <code>isEncrypted()</code> may return <code>true</code> when tested as part of making an RFCOMM
 	 * connection to device A.
 	 *
 	 * @return <code>true</code> if data exchanges with this <code>RemoteDevice</code> are being encrypted;
 	 *         <code>false</code> if they are not being encrypted, or there are no open connections between the local
 	 *         device and this <code>RemoteDevice</code>
 	 */
 	public static boolean isEncrypted(RemoteDevice device) {
 		return remoteDeviceImpl(device).isEncrypted();
 	}
 
 	public static boolean isTrustedDevice(RemoteDevice device) {
 		return remoteDeviceImpl(device).isTrustedDevice();
 	}
 }