java barcode generator example Registering a PhaseListener in Java

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Registering a PhaseListener
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When implementing a PhaseListener, you must register it by using a phase-listener XML element in the faces-configxml file This element contains a fully qualified Java class name of your PhaseListener implementation class This element is a child of the lifecycle element See 15 for the faces-configxml syntax for registering a PhaseListener
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JSF 12 TIP JSF 12 introduced a new tag to the jsf-core tag library, f:phaseListener The general
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form for this tag is shown in 16, but a usage example is included here for completeness
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<f:phaseListener binding="#{page1phaseListener}" />
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A per-view PhaseListener is guaranteed only to be invoked when the particular view on which it is declared is going through the lifecycle The f:view tag in JSF 12 also defines two new MethodExpression attributes called beforePhase and afterPhase that must point to public methods that take a PhaseEvent and return void These methods are then invoked for every phase except restore view
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Converter and Validator
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8 covered converters and validators in detail (Please refer to 8 for complete information) This section is included here as a reference to the API for providing a custom converter or validator
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Interfaces to Implement
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The interface javaxfacesconvertConverter defines the two methods shown next
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public Object getAsObject(FacesContext context, UIComponent component, String value) public String getAsString(FacesContext context, UIComponent component, Object value)
13:
Building Non-UI Custom Components
The javaxfacesvalidatorValidator interface defines a single method called validate( ), which follows:
public void validate(FacesContext context, UIComponent component, Object value)
Registering a Converter or Validator
When implementing a custom converter or validator, you may register them declaratively using converter or validator elements in the faces-configxml file, or you may register them dynamically at runtime using the API The converter and validator elements are direct children of the root faces-config element and must be the fully qualified Java class name of the class extending Converter or Validator, respectively See 15 for the facesconfigxml syntax for registering a Converter or Validator See 7 for any other converter or validator information
PART II
ViewHandler
This section is included here as a reference to the API for providing a custom ViewHandler
Abstract Class to Extend
The abstract class javaxfacesapplicationViewHandler defines the following methods:
Locale calculateLocale(FacesContext context); String calculateRenderKitId(FacesContext context); UIViewRoot createView(FacesContext context, String viewId); String getActionURL(FacesContext context, String viewId); String getResourceURL(FacesContext context, String path); void renderView(FacesContext context, UIViewRoot viewToRender) throws IOException, FacesException; public UIViewRoot restoreView(FacesContext context, String viewId); public void writeState(FacesContext context) throws IOException; public public public public public public
Registering a ViewHandler
When implementing a custom ViewHandler, you may register it declaratively using the view-handler element in the faces-configxml file, or you may register it dynamically by calling the setViewHandler( ) method on the Application instance (See the following for more on the Application instance) The view-handler element is a child of the application element in the faces-configxml file The contents of the view-handler element must be the fully qualified Java class name of your ViewHandler implementation class (See 15 for the faces-configxml syntax for registering a ViewHandler) Note that there is a ViewHandlerWrapper class to make it easier to decorate the existing ViewHandler implementation
Part II:
Extending JavaServer Faces
VariableResolver and PropertyResolver
In JSF 10 and 11, the JSF runtime has default singleton instances of VariableResolver and PropertyResolver that fulfill the specified requirements to allow JSF EL expressions to be resolved In JSF 12, these two classes have been deprecated with the introduction of the javaxelELResolver class in the Unified EL This section covers what these two classes do in JSF 10 and 11, while the following section covers ELResolver in JSF 12 The following example illustrates the central role the VariableResolver and PropertyResolver play in JSF For discussion, let s say that the JSF runtime maintains a reference to the VariableResolver and PropertyResolver using variables myVariableResolver and myPropertyResolver, respectively Also, the signatures of the resolveVariable( ) and getValue( ) methods on these classes have been abbreviated for convenience in the discussion shown next Consider the following JSF EL expression:
#{requestScopeuserfirstName}
To resolve this expression and get its value, the EL implementation in JSF 10 and 11 breaks this expression down into two parts: requestScope and userfirstName The JSF runtime calls myVariableResolverresolveVariable("requestScope") This method takes the argument string and resolves it In this case, requestScope is one of the implicit objects, listed in Table 5-6 of 5, so the VariableResolver instance must return a javautilMap implementation that wraps the attribute set for the current javaxservlet ServletRequest For the purposes of discussion, let s call this requestMap With requestScope successfully resolved to requestMap, the JSF runtime further breaks down the userfirstName part of the expression into its individual parts: user and firstName The JSF runtime calls myPropertyResolvergetValue(requestMap, "user") This method will look in the Map for a value under the key user and return it Because we re in the Virtual Trainer example, the requestMap has such a value under the key user , and this value is an instance of comjsfcompreftrainermodelUserBean For discussion, let s call this the userBean Finally, the last step in the evaluation of the expression happens when myPropertyResolvergetValue(userBean, "firstName") is called Because UserBean is a plain old JavaBean, the PropertyResolver looks for a JavaBeans property with the name firstName , which it finds, and invokes the getFirstName( ) method, thus returning the first name of the user You can now see the pattern of how the expression is continually broken down stepwise into parts, with the result of evaluating step N being fed into the evaluation of step N + 1 If we were trying to set a value into the expression for example, as the value of an h:inputText field the last part of the expression would have its setFirstName( ) method called instead of getFirstName( ) Any expression parts between the first and last parts, however, would still be evaluated exactly as in the get case You can now see that by enabling the overriding or decoration of PropertyResolver and VariableResolver, JSF allows extreme customization of the behavior of the EL Implicit objects can be intercepted or changed The operation of EL operators and [ ] can be changed The list of things you can do is open-ended The most important aspect to remember when doing a custom VariableResolver or PropertyResolver is to save and use the previous instance passed into the constructor per the decorator pattern Failure to do so will cause the EL to stop working
13:
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