javax.faces.view.facelets

Class MetaTagHandler

java.lang.Object

javax.faces.view.facelets.TagHandler

javax.faces.view.facelets.MetaTagHandler

All Implemented Interfaces:

FaceletHandler

Direct Known Subclasses:

DelegatingMetaTagHandler

public abstract class MetaTagHandler
extends TagHandler

Every kind of markup element in Facelets VDL that has attributes that need to take action on a JSF Java API artifact is associated with an instance of this class. This class is an abstraction to enable a rule based method for directing how different kinds of elements take different kinds of actions in the JSF Java API. For example, consider this markup:

<h:inputText value="#{user.userid}"
 valueChangeListener="#{user.newUserId}" />

This markup element corresponds to an instance of HtmlInputText in the view. HtmlImputText has a number of attributes that are to be exposed to the page author. HtmlInputText also implements EditableValueHolder, which extends ValueHolder. Each of these interfaces also expose a number of attributes to the page author.

Facelets employes the strategy pattern to allow the manner in which all possible attributes are handled based on the nature of the JSF Java API artifact associated with the markup element.

Subclasses override the createMetaRuleset(java.lang.Class) method to return a MetaRuleset instance encapsulating all the strategies for all the attributes that make sense for this particular markup element. The runtime calls the setAttributes(FaceletContext, Object) method to cause those rules to be executed and applied.

Since:

2.0

Field Summary

Fields inherited from class javax.faces.view.facelets.TagHandler

nextHandler, tag, tagId

Constructor Summary

Constructors

Constructor and Description
MetaTagHandler(TagConfig config) Constructor.

Method Summary

Modifier and Type	Method and Description
protected abstract MetaRuleset	createMetaRuleset(Class type) Extend this method in order to add your own rules.
protected void	setAttributes(FaceletContext ctx, Object instance) Invoking/extending this method will cause the results of the created MetaRuleset to auto-wire state to the passed instance.

Methods inherited from class javax.faces.view.facelets.TagHandler

getAttribute, getRequiredAttribute, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface javax.faces.view.facelets.FaceletHandler

apply

Constructor Detail

MetaTagHandler

public MetaTagHandler(TagConfig config)

Constructor.

Parameters:

config - the tag configuration.

Method Detail

createMetaRuleset

protected abstract MetaRuleset createMetaRuleset(Class type)

Extend this method in order to add your own rules.

Parameters:

type - the type.

Returns:

the MetaRuleset.

setAttributes

protected void setAttributes(FaceletContext ctx,
                             Object instance)

Invoking/extending this method will cause the results of the created MetaRuleset to auto-wire state to the passed instance.

Parameters:

ctx - the Facelet context.

instance - the instance.