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The Goal of JavaServer Faces UI Components
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JavaServer Faces UI components are intended to serve as the prime vehicle by which JavaServer Faces is expected to grow and become truly ubiquitous in Java Web development Although the Faces specification provides a set of ready-to-use base UI components mainly to allow for building the most general types of user interfaces, the goal behind the UI component architecture was to make it completely extendable so as to empower a growing community of Faces component developers Although JSF is still a relatively new technology, a new thriving community of Faces component developers is now emerging These communities include both vendor-supplied and open source developers, and their component libraries complement the base (Standard) JSF components in many unique ways There now exists a wide variety of third-party component libraries that range from those for general use to those intended for specific uses, such as for charting or mapping applications A relatively new open source Faces component library (and implementation) known as MyFaces is gaining popularity MyFaces, shown in Figure 6-1, provides a more powerful
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The User Interface Component Model
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PART I PART I PART I
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FIGURE 6-1
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Apache MyFaces component library and Faces implementation
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component set than the base or Standard components that further simplifies Faces Web development Oracle s ADF Faces component library, shown in Figure 6-2, also provides a set of components that greatly enhances the power of Faces Web developers In addition to ADF Faces and MyFaces, Sun Microsystems also provides a set of components packaged with its Studio Creator product Fortunately, as the JSF component development community continues to grow, some new Web sites are starting to appear that serve as guides to the different third-party components, libraries, and Faces implementations As shown in Figure 6-3, one of the prime community Web sites to emerge is JSFCentralcom (http://jsfcentralcom) At this site you ll find a thorough list of JSF components, component libraries, how-to s, and Faces-related articles
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The JavaServer Faces Framework
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FIGURE 6-2 Oracle s ADF Faces component library
James Holmes is also now providing community-based Faces-related information at his site: http://jamesholmescom/jsf As you gain more experience with JavaServer Faces, you are definitely encouraged to experiment with the various Faces components and libraries referenced at these sites You will find that the different components provide an extremely useful and thorough understanding of the power and flexibility of the JavaServer Faces technology
6:
The User Interface Component Model
PART I PART I PART I
FIGURE 6-3 JSFCentralcom, an online JSF developer s community
Introducing the JSF UI Component Architecture
There are two main types of UI components: those that initiate an action, such as a button, and those that provide data, such as an input field The behaviors of UI components are described by the distinct behavioral interfaces provided by the Faces specification UI components such as UICommand that initiate an action for example, invoking application logic as the result of a button click implement the ActionSource (or ActionSource2 in JSF 12) interfaces The other UI components that provide data (that is, allow for data to be submitted to the server), such as UIInput, implement either the ValueHolder or EditableValueHolder interfaces The EditableValueHolder interface allows for components to have their values editable by users In addition to implementing either of these two distinct groups of interfaces, UI components (and components in general) also implement various other interfaces that further define their behaviors Components that need to save their state between requests implement the StateHolder interface Converters, Validators, and UIComponents all implement StateHolder since they need to be able to save their state between requests Components that implement NamingContainer require that their children components identifier IDs are unique UIForm and UIData both implement NamingContainer
Part I:
The JavaServer Faces Framework
Aside from understanding the behaviors of the different components, it is important to understand the overall UI component class hierarchy First, all of the core UI component classes reside in the package javaxfacescomponent and are derived from UIComponent, or more directly from UIComponentBase UIComponentBase is a convenience class that provides much of the implementation you need for building a component In general, all of the components extend from UIComponentBase, which itself extends UIComponent Figure 6-4 shows the class hierarchy of the core UI components In addition to the set of core UI components, Faces provides an HTML-friendly set of UI component classes that facilitate Web application development for HTML clients (browsers) The HTML set of components reside in the package javaxfacescomponenthtml and are also derived from the same core UI component class hierarchy, but provide a further level of distinction for HTML clients For example, the HtmlCommandButton is a button that renders in HTML (see Note) and extends from the core UICommand, which extends UIComponentBase, and so on As another example of the hierarchical nature of UI components, Figure 6-5 shows the class hierarchy of the HtmlInputText UI component
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