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PARTIII PART PART
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Using Markup and the validator Attribute to Associate a Validator with a UIComponent Instance
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Unlike conversion, validation is a one-way process, and it happens only once during a run through the request processing lifecycle These constraints open up the possibility of using the Expression Language to point to a method on an arbitrary JavaBean that adheres to the contract and signature of Validatorvalidate( ) The MethodBinding class from the EL makes this possible For example:
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<h:inputText validator="#{uservalidateAge}" value="#{userage}" />
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assuming the user bean has a method defined like
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public void validateAge(FacesContext context, UIComponent component, Object value) { // Validation code here }
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During the Process Validations phase, when it comes time to validate this component, call the method validateAge( ) on the bean named user and assume that it will fulfill the contract of a Validator This late-binding approach saves the instantiation of separate Validator instances and can greatly simplify application design by allowing you to put the business logic, and the method to validate it, in the same class All of the tags in the html_basic tag library that map to UIComponents and that implement the interface javaxfacescomponentEditableValueHolder honor the validator attribute They are
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inputHidden inputTextarea selectManyListbox selectOneMenu inputSecret selectBooleanCheckbox selectManyMenu selectOneRadio inputText selectManyCheckbox selectOneListbox
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The JavaServer Faces Framework
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Note that using this method of association allows only one Validator to be added to the component, but you can still attach multiple validators using the other methods of association
Programmatically Associating a Validator with a UIComponent Instance
As with converters, the markup layer for validators is merely a fa ade around the component model The markup tags all result in a call to addValidator( ) on the underlying component instance, and the required attribute results in a call to setRequired(true) on the component It is certainly possible to call these methods directly, but as with converters, you must be aware of when in the request processing lifecycle your code to add the validator or set the required attribute will execute
TIP If you want your Validator to be used during the whole lifecycle, try using a UIView
RootPhaseListener registered for the beforePhase event of the Render Response phase This will ensure that the Validator is installed before the first rendering and that it remains installed throughout the life of the view thanks to the state management APIs
Once you know when in the lifecycle your validator installing code will execute, it s a matter of creating and adding it to the desired component The following example shows how to programmatically create and add two different Validator instances on a component in the view
FacesContext context = FacesContextgetCurrentInstance( ); Validator progressValidator = null; MethodBinding pointerToValidatorMethod = null; EditableValueHolder component = null; UIViewRoot root = contextgetViewRoot(); // Find the component on which we'll add the Validator component = (EditableValueHolder) rootfindComponent("form" + NamingContainerSEPARATOR_CHAR + "userComponent"); // Ensure that this component doesn't already have a // progressValidator Validator [] validators = componentgetValidators( ); boolean found = false; for(int i = 0; i < validatorslength && !found; i++) { found = (validators[i] instanceof ProgressValidator); } if(found) { return; } // Create the progressValidator progressValidtor = contextgetApplication()createValidator("progressValida tor"); // Add it to the component componentaddValidator(progressValidator); // Ensure that this component doesn't already // have a validator in its MethodBinding slot if(null != componentgetValidator()) { return; } Class params = {FacesContextclass, UIComponentclass, Objectclass};
8:
C o n v e r t i n g a n d Va l i d a t i n g D a t a
pointerToValidatorMethod = contextgetApplication()createMethodBinding("#{uservalidateAge}", params); componentsetValidator(pointerToValidatorMethod);
PARTIII PART PART
The main point of this example is to show the use of the createValidator( ), addValidator( ), and setValidator( ) methods Note that we had to take extra care to check if the validator was already added This is necessary because validators are additive, whereas converters are not
The Lifetime of a Validator
As shown previously, the Faces converter system will implicitly associate a Converter with a component based on the Java language type of the model property to which the component s value is bound There is no such implicit concept for validation Due to the lack of implicit validation, it s easier to be aware of the lifetime implications of validators because you always have to take some kind of action to add a Validator In all cases, once you take that action, the Validator instance persists for the lifetime of the UIComponent instance, which is generally limited by the lifetime of the session If you re worried about excessive object instantiation, a good approach is to use the MethodBindingValidator technique as shown in the section Writing a validation( ) Method That Is Pointed to by a MethodBinding This places the lifetime constraints squarely into the realm of managed beans
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