itextsharp barcode vb.net The Relationship of the ViewHandler to the Rest of the JSF System in Java

Print DataMatrix in Java The Relationship of the ViewHandler to the Rest of the JSF System

The Relationship of the ViewHandler to the Rest of the JSF System
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As mentioned in 3, the ViewHandler plays an important role in fulfilling the requirements of the Restore View and Render View lifecycle phases Thus, the ViewHandler must interface with the other parts of the system that take part in these phases The role of the ViewHandler in the request processing lifecycle is shown in Figure 13-1
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The Relationship Between ViewHandler, RenderKit, and the Act of View Construction
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As Figure 13-2 shows, the concept of the ViewHandler is intimately related to the concept of the RenderKit, though it is certainly not necessary to have a new ViewHandler every time you want to use a different RenderKit In some sense, a ViewHandler is like a programming language compiler It takes a page written in some language, usually a markup language, and turns it into a tree of UIComponent instances If you want to use a different programming language, say in moving from C++ to Java, then you need a different compiler By analogy, if you want to use a different page description language, using XHTML instead of JSP for example, you need a different ViewHandler The ViewHandler is responsible for deriving the proper renderKitId from the incoming request in its implementation of the calculateRenderKitId( ) method This determines which RenderKit is used to process this request The incoming request also contains information about the natural language to be used to render this response in the form of the Accept-Lang HTTP header The ViewHandler must perform an algorithm on the request and derive the correct Locale in the calculateLocale( ) method Finally, the ViewHandler is also responsible for returning rendering technology specific URLs for actions and resources when given a viewId For example, the renderer for the UIForm component calls viewHandler getActionURL( ) to aid in rendering the HTML action attribute on the <form> tag, while the renderer for the UIGraphic component calls viewHandlergetResourceURL( ) to aid in rendering the HTML src attribute on the <img> tag
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13:
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FIGURE 13-1 The role of the ViewHandler in the request processing lifecycle
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FIGURE 13-2 The relationship between ViewHandler and RenderKit
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Extending JavaServer Faces
As covered in 10, all renderers must write their markup using the ResponseWriter or ResponseStream classes The specific instances of these classes must be installed on the FacesContext during viewHandlerrenderView( ), and the current RenderKit is where the ViewHandler turns to create instances of a ResponseWriter or ResponseStream
E XPERT GROUP I NSIGHT The specification of the ViewHandler was intentionally loose to
allow for a wide range of implementation possibilities For example, the default implementation of the createView( ) method simply creates an empty UIViewRoot, with no children, and returns it This is because the default ViewHandler is designed for JSP, which must execute the page in order to construct the view Because rendering and page execution must occur simultaneously, or nearly simultaneously, in JSP, this action is deferred to the renderView( ) method Other view description technologies may not have this restriction For example, imagine a simple XML-based view description technology where the createView( ) method simply loads the XML file for this view, and creates a view of UIComponent instances from it
The Relationship Between ViewHandler and the State Management System
Figure 13-3 shows the relationship between the ViewHandler and the StateManager The StateManager API was covered in detail in 12, but it makes sense to review it from the perspective of the ViewHandler The restoreView( ) method is responsible for returning a UIViewRoot that is the root of a view which is identical to the view rendered to the client the last time the renderView( ) method was called The default implementation of restoreView( ) calls through to StateManager API to accomplish this task, but it is not required to do so On the state saving side, the writeState( ) method of the ViewHandler is called by the rendering system to inject the state into the rendered output Naturally, the manner in which this is accomplished is very specific to the rendering technology which can cause some tight coupling between the ViewHandler and StateManager implementations
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