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package javax.faces.view.facelets;
/**
* <p class="changed_added_2_0">The root class of the abstraction that
* dictates how attributes on a markup element in a Facelets VDL page
* are wired to the JSF API object instance associated with that
* element. The single method on this interface, {@link #applyRule},
* returns an encapsulation of the behavior that actually does the work
* of handling the attribute and its value. There are implementations of
* specific concrete subclasses of this class for all the basic kinds of
* elements that appear in Facelets VDL pages: components,
* non-components, and attached objects.</p>
*
* <div class="changed_added_2_0">
* <p>For example, consider this markup:</p>
<code><pre><h:inputText value="#{user.userid}"
valueChangeListener="#{user.newUserId}" /></pre></code>
* Two <code>MetaRule</code> instances are involved in this example.</p>
* <ol>
*
* <li><p>The first has
* an <code>applyRule()</code> method that returns a {@link Metadata}
* instance that, when its <code>applyMetada()</code> method is called,
* dictates how the "value" attribute is processed: calling {@link
* javax.faces.component.UIComponent#setValueExpression} on the
* <code>UIComponent</code> instance associated with the
* <code><h:inputText></code> element.</p></li>
* <li><p>The second has an <code>applyRule()</code> method that returns
* a {@link Metadata} instance that, when its
* <code>applyMetadata()</code> method is called, dictates how the
* "valueChangeListener" attribute is processed: calling {@link
* javax.faces.component.EditableValueHolder#addValueChangeListener}.</p></li>
* </ol>
* </div>
*
* @since 2.0
*/
public abstract class MetaRule {
/**
* <p class="changed_added_2_0">Return an abstraction that takes
* appropriate action given the kind of rule represented by the
* argument <code>name</code>, in the context of this particular
* concrete subclass of <code>MetaRule</code>. The abstraction must
* encapsulate the value from the argument
* <code>attribute</code>.</p>
* @since 2.0
* @param name the name for this rule. This will generally be the
* name of a tag attribute in the VDL.
* @param attribute the name/value pair for this attribute on this
* particular instance of an element in the page.
* @param meta the <code>MetadataTarged</code> that can be used to
* discern what kind of action to encapsulate within the abstraction
* to be returned.
*/
public abstract Metadata applyRule(String name, TagAttribute attribute,
MetadataTarget meta);
}