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The implementation does not matter anyway because interfaces are used and the applications using the implementations will not care how the user identification information is extracted In fact, this is why interfaces are used so that you are not dependent on a particular implementation The following source code starts the implementation of the IUserIdentification interface: public class UserIdentification : IUserIdentification { private string _identifier; private bool _isIdentified; public UserIdentification() { _isIdentified = false; } public UserIdentification( string identifier) { _identifier = identifier; _isIdentified = true; } public string Identifier { get { return _identifier; } } public bool IsIdentified { get { return _isIdentified; } } } The implementation of UserIdentification has two constructors, with and without parameters There are two constructors to indicate the two states of user identification: found and not found The constructor without parameters indicates that no user has been identified.

So far, our MediaGrabber is able to record media, save it to the local filesystem, and play media back to us. That s cool, but isn t it a bit of a shame that we re the only ones who can enjoy it Let s enhance the app and come up with a way to pass media off the device so we can share it with friends and family. First, let s take care of a little housekeeping. In 3 we saw how time-consuming operations should run in a separate thread to keep the UI responsive. We also saw that we needed to use a separate class to handle updates to our Screen that originated from

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a new thread. We will have the same issue with sending media as we did with playing it, so rather than reimplementing that special class again, let s create a general-purpose stand-alone class that is capable of handling asynchronous UI updates. Listing 4-1 shows the implementation of StatusUpdater. Feel free to use this in any of your own projects, as this is a fairly common task. You may also want to adapt it for other types of Field objects other than simple text labels.

The other constructor, which has a single parameter, indicates that user identification has been found; the single parameter is the state of the identified user In the implementation of either constructor, the private data member isIdentified is assigned a value of true or false to indicate whether or not, respectively, a user identification has been found The properties of UserIdentification define the state of the user identification, and it is important to understand that UserIdentification is a state object A state object is one where the primary focus is to store data that is used by other processes to make decisions A state.

If a feature is supported, it will indicate so by adding classes similar to these: <html class="js canvas canvastext geolocation crosswindowmessaging websqldatabase indexeddb hashchange historymanagement draganddrop websockets rgba hsla multiplebgs backgroundsize borderimage borderradius boxshadow opacity cssanimations csscolumns cssgradients cssreflections csstransforms csstransforms3d csstransitions video audio localstorage sessionstorage webworkers applicationcache svg smil svgclippaths fontface"> If a feature is not supported, Modernizr will append a no- prefix to the same set of classes: <html class="js no-canvas no-canvastext no-geolocation no-crosswindowmessaging nowebsqldatabase no-indexeddb no-hashchange no-historymanagement no-draganddrop no-websockets no-rgba no-hsla no-multiplebgs no-backgroundsize no-borderimage no-borderradius no-boxshadow no-opacity no-cssanimations no-csscolumns no-cssgradients no-cssreflections no-csstransforms no-csstransforms3d no-csstransitions no-video no-audio no-localstorage no-sessionstorage nowebworkers no-applicationcache no-svg no-smil no-svgclippaths no-fontface"> Depending on the browser's support of features, you'll get a mix-and-match list of the feature and no-feature classes You can now reliably use these classes in your CSS to detect support for each feature and progressively upgrade the user experience: .

Listing 4-1. A General Class for Updating Label Elements Asynchronously package com.apress.king.mediagrabber; import net.rim.device.api.ui.UiApplication; import net.rim.device.api.ui.component.LabelField; public class StatusUpdater implements Runnable { private LabelField status; private String message; private UiApplication app; public StatusUpdater(LabelField status) { this.status = status; app = UiApplication.getUiApplication(); } public void sendDelayedMessage(String message) { this.message = message; app.invokeLater(this); } public void run() { status.setText(message); } }

object is very versatile because it does not have other type dependencies and does not manipulate other classes; thus the UserIdentification implementation would be similar for all IUserIdentificationResolver<> implementations The interface IUserIdentificationResolver<> is used to extract the user identifiers For HTTP authentication, the implementation is illustrated as follows: public class HttpAuthenticationResolver : IUserIdentificationResolver<HttpRequest> { IUserIdentificationFactory _factory; public HttpAuthenticationResolver(IUserIdentificationFactory factory) { _factory = factory; } public IUserIdentification Resolve(HttpRequest app) { if (requestHeaders["Authorization"] != null) { string identifier = ""; // Do some operations to find out who it is return _factoryCreate(identifier); } else { return _factoryCreate(); } } } The class HttpAuthenticationResolver implements the interface IUserIdentificationResolver<>, and for the Generics parameter defines the type HttpRequest What this declaration is saying is that the resolver will extract the user identification information from the type HttpRequest In ASPNET, HttpRequest contains all the information that is sent by the request.

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