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java.lang.Object javax.faces.view.facelets.TagHandler javax.faces.view.facelets.MetaTagHandler
public abstract class MetaTagHandler
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 |
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Fields inherited from class javax.faces.view.facelets.TagHandler |
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nextHandler, tag, tagId |
Constructor Summary | |
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MetaTagHandler(TagConfig config)
|
Method Summary | |
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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 |
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getAttribute, getRequiredAttribute, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface javax.faces.view.facelets.FaceletHandler |
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apply |
Constructor Detail |
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public MetaTagHandler(TagConfig config)
Method Detail |
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protected abstract MetaRuleset createMetaRuleset(java.lang.Class type)
type
- protected void setAttributes(FaceletContext ctx, java.lang.Object instance)
ctx
- instance
-
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Generated on 10-February-2011 12:41