barcode vb.net source code Extending JavaServer Faces in Java

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Extending JavaServer Faces
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to use the inner class decorator pattern shown in the section ExceptionHandlerFactory to implement the getViewDeclarationLanguage( ), as shown here:
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public class MyViewDeclarationLanguageFactory extends ViewDeclarationLanguageFactory { private ViewDeclarationLanguageFactory parent; public MyViewDeclarationLanguageFactory(ViewDeclarationLanguageFactory parent) { thisparent = parent; } public ViewDeclarationLanguageFactory getWrapped( ) { return thisparent; } public ViewDeclarationLanguage getViewDeclarationLanguage(String viewId) { final ViewDeclarationLanguage parentVDL = getWrapped( ) getViewDeclarationLanguage( ); ViewDeclarationLanguage result = new ViewDeclarationLanguageWrapper( ) { public ViewDeclarationLanguage getWrapped( ) { return parentVDL; } // implement as many or as few methods from // ViewDeclarationLanguage }; }
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A developer would decorate the ViewDeclarationLanguageFactory if she wanted to provide a new VDL for JSF For example, it would be very useful if the Jamon templating engine (wwwjamonorg/) could be used as a View Declaration Language for JSF
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VisitContextFactory
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Decorating this class allows you to affect how the runtime takes an input file and produces a tree of UIComponent instances against which the JSF lifecycle can be run
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Abstract Class to Extend A custom VisitContextFactory must extend the class javaxfaces
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VisitContextFactory and implement the following method:
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public VisitContext getVisitContext(FacesContext context, Collection<String> ids, Set<VisitHint> hints);
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This class implements FacesWrapper, so really it s only necessary to override the getWrapped( ) method as shown in the introductory section on decoration It is convenient to use the inner class decorator pattern shown in the section ExceptionHandlerFactory to implement the getVisitContext( ), as shown here:
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public class MyVisitContextFactory extends VisitContextFactory { private VisitContextFactory parent; public MyVisitContextFactory(VisitContextFactory parent) { thisparent = parent; } public VisitContextFactory getWrapped( ) { return thisparent; }
13:
Building Non-UI Custom Components
public VisitContext getVisitContext(FacesContext context, Collection<String> ids, Set<VisitHint> hints) { final VisitContext parentVDL = getWrapped( ) getVisitContext( ); VisitContext result = new VisitContextWrapper( ) { public VisitContext getWrapped( ) { return parentVDL; } // implement as many or as few methods from // VisitContext }; }
PART II
A developer would decorate the VisitContextFactory if he wanted to control or observe the way the JSF runtime traverses the view during the execution of the lifecycle
Application Factory
The final factory class you can replace is the ApplicationFactory The Application instance is really the heart of the JSF runtime It is an application singleton that holds references to many core JSF classes Some possible use cases for decorating the ApplicationFactory include Gaining access to the process by which new UIComponent instances are created by overriding or decorating the createComponent( ) method Gaining access to the process by which new Converter instances are created by overriding or decorating the createConverter( ) method Gaining access to the process by which new Validator instances are created by overriding or decorating the createValidator( ) method Supplementing the Locale awareness afforded by the getSupportedLocales( ) method to include other Locales without using the XML configuration syntax of the <locale-config> element described in 15 For example, if an application needs to dynamically support a changeable set of Locales at runtime without restarting, decorating the ApplicationFactory would provide one way to meet this requirement In JSF 11, Application has the JavaBeans properties shown in Table 13-5 Recall that a JavaBeans property is really just a pair of getter/setter methods that conform to the following naming conventions For Read Only properties, only the getter method exists For Write Only properties, only the setter method exists For Read/Write methods, both a getter and a setter exist To derive the name of the getter or setter method given a property name, capitalize the first letter of the property and prefix it with get or set, respectively For example, for the Read/Write property actionListener, the getter is getActionListener( ) and the setter is setActionListener( ) The type of the property is the return type of the getter method, which must be the same as the argument type of the setter method Finally, the getter must take no arguments, and the setter method must take only one argument the same type as the return type of the getter method In addition to providing the properties shown in Table 13-5, Application also defines the following methods: createComponent( ), createConverter( ), createMethodBinding( ), createValidator( ), and createValueBinding( )
Part II:
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