@Override
public void start(BundleContext context) throws Exception {
SingletonProviderFactory.setProviderClass(RAPSingletonProvider.class);
}
/**
* Base class for handling login authentication in applications. You can register an implementation
* of {@link ILoginDelegate} via the extension-point "org.nightlabs.base.ui.login", which will be
* processed by this class. Per application only one registered {@link ILoginDelegate} is allowed,
* otherwise an exception is thrown. You can trigger login or logout via the static methods {@link
* #login()} or {@link #logout()}.
*/
public final class Login extends AbstractEPProcessor {
private static ISingletonProvider<Login> sharedInstance =
SingletonProviderFactory.createProviderForFactory(
new ISingletonFactory<Login>() {
@Override
public synchronized Login makeInstance() {
Login login = new Login();
login.process();
return login;
}
});
public static Login sharedInstance() {
return sharedInstance.getInstance();
}
private Login() {}
/**
* Is a shortcut to {@link #sharedInstance()} and {@link #_login()}.
*
* @return Returns the shared instance after login was performed.
* @throws LoginException If the login fails (usually the login will retry until the user cancels,
* but then, a WorkOfflineException or sth. similar will be thrown)
*/
public static Login login() throws LoginException {
Login login = sharedInstance();
login._login();
return login;
}
/**
* Is a shortcut to {@link #sharedInstance()} and {@link #_logout()}.
*
* @return Returns the shared instance after logout was performed.
*/
public static Login logout() {
Login login = sharedInstance();
login._logout();
return login;
}
public static LoginState getLoginState() {
return sharedInstance()._getLoginState();
}
// private void lazyProcess()
// {
// if (isProcessed())
// return;
//
// try {
// process();
// } catch (EPProcessorException e) {
// throw new RuntimeException(e);
// }
// }
private void assertLoginDelegateExists() {
if (loginDelegate == null)
throw new IllegalStateException(
"There is no ILoginDelegate registered! Exactly one plugin must contribute an extension to the extension point \""
+ getExtensionPointID()
+ "\"!"); //$NON-NLS-1$ //$NON-NLS-2$
}
public synchronized void _login() throws LoginException {
// lazyProcess();
assertLoginDelegateExists();
loginDelegate.login();
}
public synchronized void _logout() {
// lazyProcess();
assertLoginDelegateExists();
loginDelegate.logout();
}
public synchronized LoginState _getLoginState() {
// lazyProcess();
assertLoginDelegateExists();
return loginDelegate.getLoginState();
}
private String contributingPluginId = null;
private ILoginDelegate loginDelegate = null;
@Override
public String getExtensionPointID() {
return "org.nightlabs.base.ui.login"; //$NON-NLS-1$
}
public static final String LOGIN_DELEGATE_ELEMENT = "login";
@Override
public void processElement(IExtension extension, IConfigurationElement element) throws Exception {
if (Login.LOGIN_DELEGATE_ELEMENT.equals(element.getName())) {
ILoginDelegate loginDelegate;
try {
loginDelegate = (ILoginDelegate) element.createExecutableExtension("class"); // $NON-NLS-1$
} catch (Exception e) {
throw new EPProcessorException(e.getMessage(), extension, e);
}
if (this.loginDelegate != null)
throw new EPProcessorException(
"More than one plugin provide an extension to \""
+ getExtensionPointID()
+ "\": The plugin \""
+ contributingPluginId
+ "\" did already initialize loginDelegate and the plugin \""
+ extension.getNamespaceIdentifier()
+ "\" collides with this previous contribution!",
extension); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
this.contributingPluginId = extension.getNamespaceIdentifier();
this.loginDelegate = loginDelegate;
}
}
}
