ej.ecom

Class DeviceManager

java.lang.Object

ej.ecom.DeviceManager

public class DeviceManager
extends Object

The DeviceManager holds the Device registry. It allows to register, unregister, list devices. Registered RegistrationListener are notified when a device is registered or unregistered.

Method Summary

Modifier and Type	Method and Description
static <D extends Device> void	addRegistrationListener(RegistrationListener<D> listener, Class<D> deviceType) Adds the given RegistrationListener to be notified when a device of the given type is registered or unregistered.
static Iterator<Device>	list() List all registered devices.
static <D extends Device> Iterator<D>	list(Class<D> deviceType) List all registered devices such as the given type is assignable from the device class.
static <D extends Device> void	register(Class<D> deviceType, D device) Registers a new device with the given type.
static <D extends Device> void	removeRegistrationListener(RegistrationListener<D> listener) Removes the given RegistrationListener from the list of listeners that are notified when a device is registered or unregistered.
static void	unregister(Device device) Unregisters the given device.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

addRegistrationListener

public static <D extends Device> void addRegistrationListener(RegistrationListener<D> listener,
                                                              Class<D> deviceType)

Adds the given RegistrationListener to be notified when a device of the given type is registered or unregistered. If there is a security manager, its SecurityManager.checkPermission(java.security.Permission) method is called with the DeviceManagerPermission.READ name and the device type. The listener may be registered multiple times on different device types.

Type Parameters:

D - the type of the devices to be listened for

Parameters:

listener - the registration listener

deviceType - the type of the devices to be listened for

Throws:

SecurityException - if a security manager exists and it does not allow the caller to listen to devices registered with the given type

removeRegistrationListener

public static <D extends Device> void removeRegistrationListener(RegistrationListener<D> listener)

Removes the given RegistrationListener from the list of listeners that are notified when a device is registered or unregistered. The listener may have been registered multiple times on different device types.

Type Parameters:

D - the type of the device listened for

Parameters:

listener - the registration listener

register

public static <D extends Device> void register(Class<D> deviceType,
                                               D device)

Registers a new device with the given type. If there is a security manager, its SecurityManager.checkPermission(java.security.Permission) method is called with DeviceManagerPermission.MODIFY name and the device type.

Type Parameters:

D - the type of the device to be registered

Parameters:

deviceType - the type of the device to be registered

device - the device to be registered

Throws:

SecurityException - if a security manager exists and it does not allow the caller to register a device with the given type.

IllegalArgumentException - if the device has already been registered

unregister

public static void unregister(Device device)

Unregisters the given device. If there is a security manager, its SecurityManager.checkPermission(java.security.Permission) method is called with DeviceManagerPermission.MODIFY name and the device type on which it has been registered. Some devices are registered by the underlying platform and cannot be unregistered.

Parameters:

device - the device to be unregistered

Throws:

SecurityException - if a security manager exists and it does not allow the caller to unregister a device

list

public static Iterator<Device> list()

List all registered devices. If there is a security manager, its SecurityManager.checkPermission(java.security.Permission) method is called with DeviceManagerPermission.READ name and the Device class. This is equivalent to:

list(Device.class)

Returns:

an iterator of all registered devices.

Throws:

SecurityException - if a security manager exists and it doesn't allow the caller to list devices

list

public static <D extends Device> Iterator<D> list(Class<D> deviceType)

List all registered devices such as the given type is assignable from the device class. If there is a security manager, its SecurityManager.checkPermission(java.security.Permission) method is called with DeviceManagerPermission.READ action and the device type.

Type Parameters:

D - the type of devices to list

Parameters:

deviceType - the type of the device to be registered

Returns:

an iterator of all registered devices of the given type

Throws:

SecurityException - if a security manager exists and it doesn't allow the caller to list devices of the given type