visual basic 6.0 barcode generator The Navigation Model in Java

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The Navigation Model
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E XPERT GROUP I NSIGHT You may notice that this event processing model is similar to the one
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found in standard rich-client Java applications The similarity is intentional The expert group wanted to make the event model as similar as possible to that found in rich clients It was hoped this would ease development for those familiar with existing rich-client UI toolkits Also, note the key role of the expression language MethodBinding in action processing and navigation Enabling the user to easily specify a method that should be called when a button is pressed was the impetus for inventing the concept of MethodBinding
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PARTIII PART PART
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When the NavigationHandler finishes processing the navigation rule, if successful, a new page will be rendered to the client in the Render Response phase of the request processing lifecycle
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E XPERT GROUP I NSIGHT The Invoke Application phase of the request processing lifecycle was
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designed to be the place where other frameworks, such as Struts, could plug in to JavaServer Faces applications This is accomplished by replacing the default ActionListener and calling into the Struts navigation machinery Also, in keeping with the emphasis on extensibility, it is possible to replace or decorate the existing NavigationHandler, which allows total customization of the navigation system One example of the usefulness of this extension point is the ability to have one part of your site built with Faces and another with a different framework, and be able to step cleanly between the two worlds
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A Note on Faces Action Methods
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As you ve seen, Faces action methods are user-definable methods that process an event triggered by clicking buttons, links, or any UIComponent that implements ActionSource such as UICommand As you may have noticed by now, building action methods to handle user-initiated events is a very common Faces development task Fortunately, building Faces action methods is quite simple, as they are not defined by any specific API Instead, any method that has the following characteristics can serve as a Faces action method: Must be public Can accept no arguments Must return an Object instance whose toString( ) method will be called to get the string value for the navigation rule As you will see throughout the book, Faces action methods are really the glue that binds the application s user interactive components to the application s server-side logic In a way, they can be thought of as analogous to Struts Actions in that they are the first bit of code that is executed when a user event occurs A key difference, however, is that Faces action methods are not directly URL-accessible, such as http://strutsapp/actiondo
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Building Navigation Rules
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Now that you ve seen the theory behind Faces navigation, it s time to start putting that theory into practice by defining some Faces navigation rules JavaServer Faces navigation rules provide a precise way for the developer to define all of the application s navigations
Part I:
The JavaServer Faces Framework
The rules usually reside in the faces-configxml file, or they can be configured to reside in a separate file (An example of how to do this is shown later in this chapter) To get a general feel for how navigation rules work, let s take an example from the real world by modeling a simple scenario with a Faces navigation rule: If I m in the living room, and I m feeling hungry, I go to the kitchen If I m in the living room, and I m feeling sleepy, I go to the bedroom This could be modeled with the following navigation rule
<navigation-rule> <from-view-id>livingRoom </from-view-id> <navigation-case> <from-outcome>hungry</from-outcome> <to-view-id>kitchen</to-view-id> </navigation-case> <navigation-case> <from-outcome>sleepy</from-outcome> <to-view-id>bedroom </to-view-id> </navigation-case> </navigation-rule>
As you can see, navigation rules can easily model many real-world or application scenarios Navigation rules in a more generic form actually have the following structure:
<navigation-rule> <from-view-id>from_pagexhtml</from-view-id> <navigation-case> <from-action>#{ManagedBeanactionMethod}</from-action> <from-outcome>condition 1</from-outcome> <to-view-id>/to_page1xhtml</to-view-id> </navigation-case> <navigation-case> <from-action>#{ManagedBeanactionMethod}</from-action> <from-outcome>condition 2</from-outcome> <to-view-id>/to_page2xhtml</to-view-id> </navigation-case> </navigation-rule>
Navigation rules have an optional, single from-view-id, which is where the navigation originates As a peer of the from-view-id are 1 to N navigation-case entries A navigationcase statement has the following child elements: <from-action> An action method that returns a custom String value such as Success or Failure, which is usually used to indicate if the action method executed successfully This element along with from-outcome is needed for dynamic navigation where the output of the action method specified in the from-action element is compared to the from-outcome value If a match occurs, the corresponding to-viewid location will be navigated to <from-outcome> A String value that is passed to the NavigationHandler, where it is compared with either the output of the corresponding from-action or the action attribute of a UI component with navigation support such as commandLink or commandButton <to-view-id> The page to which the user will be navigated upon a successful match of the from-action and from-outcome
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