Class MetaTagHandler

  extended by javax.faces.view.facelets.TagHandler
      extended by javax.faces.view.facelets.MetaTagHandler
All Implemented Interfaces:
Direct Known Subclasses:

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.


Field Summary
Fields inherited from class javax.faces.view.facelets.TagHandler
nextHandler, tag, tagId
Constructor Summary
MetaTagHandler(TagConfig config)
Method Summary
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.
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

Constructor Detail


public MetaTagHandler(TagConfig config)
Method Detail


protected abstract MetaRuleset createMetaRuleset(java.lang.Class type)
Extend this method in order to add your own rules.

type -


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.

ctx -
instance -

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