public abstract class MetaTagHandler extends TagHandler
Every kind of markup element in Facelets VDL that has attributes that need to take action on a Jakarta Faces 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 Jakarta Faces 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 Jakarta Faces 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.
nextHandler, tag, tagId| Constructor and Description |
|---|
MetaTagHandler(TagConfig config)
Constructor.
|
| Modifier and Type | Method and Description |
|---|---|
protected abstract MetaRuleset |
createMetaRuleset(java.lang.Class type)
Extend this method in order to add your own rules.
|
protected void |
setAttributes(FaceletContext ctx,
java.lang.Object instance)
Invoking/extending this method will cause the results of the created MetaRuleset to auto-wire state to the passed
instance.
|
getAttribute, getRequiredAttribute, toStringclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitapplypublic MetaTagHandler(TagConfig config)
config - the tag configuration.protected abstract MetaRuleset createMetaRuleset(java.lang.Class type)
type - the type.MetaRuleset.protected void setAttributes(FaceletContext ctx, java.lang.Object instance)
ctx - the Facelet context.instance - the instance.