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Extending JavaServer Faces
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"javaxfacesInput", "javaxfacesText" }, "javaxfacesInput", "javaxfacesTextarea" }, "javaxfacesMessage", "javaxfacesMessage" }, "javaxfacesMessages", "javaxfacesMessages" }, "javaxfacesOutput", "javaxfacesFormat" }, "javaxfacesOutput", "javaxfacesLabel" }, "javaxfacesOutput", "javaxfacesLink" }, "javaxfacesPanel", "javaxfacesGrid" }, "javaxfacesPanel", "javaxfacesGroup" }, "javaxfacesSelectBoolean", "javaxfacesCheckbox" }, "javaxfacesSelectMany", "javaxfacesCheckbox" }, "javaxfacesSelectMany", "javaxfacesListbox" }, "javaxfacesSelectMany", "javaxfacesMenu" }, "javaxfacesSelectOne", "javaxfacesListbox" }, "javaxfacesSelectOne", "javaxfacesMenu" }, "javaxfacesSelectOne", "javaxfacesRadio" }
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/** Creates a new instance of ExtendHtmlBasicRenderKitFactory */ public ExtendHtmlBasicRenderKitFactory(RenderKitFactory parent) { thisparent = parent; } private RenderKitFactory parent = null; public RenderKit getRenderKit(FacesContext facesContext, String renderKitId) { RenderKit result = null; // First, ask the parent if (null == (result = parentgetRenderKit(facesContext, renderKitId))) { // Note that we don t care if renderKitId is null, because we re // supposed to throw a NullPointerException if it is if (renderKitIdequals("comjsfcomprefCustomRenderKit")) { result = createAndPopulateBasicRenderKitInstance(facesContext); parentaddRenderKit("comjsfcomprefCustomRenderKit", result); } } return result; } private RenderKit createAndPopulateBasicRenderKitInstance(FacesContext context) { RenderKit result = new BasicRenderKit(); RenderKit standard = parentgetRenderKit(context, RenderKitFactoryHTML_BASIC_RENDER_KIT); int i = 0; // For all renderers except outputText, copy from the standard RenderKit for (i = 0; i < standardRenderKitlength; i++) { resultaddRenderer(standardRenderKit[i][0], standardRenderKit[i][1], standardgetRenderer(standardRenderKit[i][0], standardRenderKit[i][1])); } // Replace just the outputText renderer resultaddRenderer("javaxfacesOutput", "javaxfacesText", new SpecialOutputTextRenderer()); return result; }
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12:
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public void addRenderKit(String renderKitId, RenderKit renderKit) { parentaddRenderKit(renderKitId, renderKit); } public Iterator getRenderKitIds() { return parentgetRenderKitIds(); } }
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In the constructor, you see the now familiar decorator pattern at work The getRenderKit( ) method first delegates to the parent RenderKitFactory to satisfy the request If no RenderKit is found for the argument renderKitId and the argument is equal to the literal string com jsfcomprefCustomRenderKit, the createAndPopulateBasicRenderKitInstance( ) method is called This method creates an instance of the class BasicRenderKit and leverages the private data-structure called standardRenderKit to populate it with renderers from the standard HTML_BASIC RenderKit for all renderers except the OutputText Renderer This one is handled specifically by adding an instance of SpecialOutputTextRenderer The new BasicRenderKit is returned where it is added to the list of RenderKits stored in the parent The remaining methods, addRenderKit( ) and getRenderKitIds( ), simply delegate to the parent
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PART II
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FacesContextFactory
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As mentioned at the beginning of this section, one good use-case for providing a custom FacesContextFactory is adapting JSF to the Portlet environment However, this is certainly not the only conceivable use-case One could also imagine adapting JSF to run inside of a pure Swing application environment, though no one has yet taken this approach Any such attempt would most likely choose to provide a custom FacesContextFactory
Abstract Class to Extend A custom implementation of FacesContextFactory must extend the abstract class javaxfacescontextFacesContextFactory and implement the following method
public FacesContext getFacesContext(Object context, Object request, Object response, Lifecycle lifecycle) throws FacesException; Let s examine the simple implementation of this method in the Sun JSF-Portlet integration library, shown next:
public FacesContext getFacesContext(Object context, Object request, Object response, Lifecycle lifecycle) throws FacesException { if ((context == null) || (request == null) || (response == null) || (lifecycle == null)) { throw new NullPointerException(); } ExternalContext econtext = new ExternalContextImpl((PortletContext) context, (PortletRequest) request, (PortletResponse) response); return (new FacesContextImpl(econtext, lifecycle)); }
Part II:
Extending JavaServer Faces
Here, getFacesContext( ) simply creates an ExternalContextImpl instance, casts the context, request, and response arguments to their Portlet interface classes, and passes them on to the FacesContextImpl constructor The implementation details of these classes are not pertinent to this discussion and have been omitted from the text
LifecycleFactory
The capabilities of this particular JSF extension point are also used in the JSF Portlet integration library; however, the full power of providing additional lifecycles has not yet been fully explored as of this writing
Abstract Class to Extend A custom LifecycleFactory must extend the class javaxfaces lifecycleLifecycleFactory and implement the following methods
public abstract void addLifecycle(String lifecycleId, Lifecycle lifecycle); public abstract Lifecycle getLifecycle(String lifecycileId); public abstract Iterator getLifecycleIds( ); Like the RenderKitFactory, the LifecycleFactory maintains a Map of lifecycleIds to Lifecycle instances In order to take advantage of using a custom LifecycleFactory, you must examine the API of the Lifecycle class public void addPhaseListener(PhaseListener listener); public void removePhaseListener(PhaseListener listener); public PhaseListener[] getPhaseListeners( ); public void execute(FacesContext context) throws FacesException; public void render(FacesContext context) throws FacesException; The first three methods are simply an implementation of a JavaBeans listener property for PhaseListener The execute( ) method is responsible for running the postback part of the lifecycle, as described in 3 The render( ) method is responsible only for rendering
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