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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>
*
<pre><code><h:inputText value="#{user.userid}"
* valueChangeListener="#{user.newUserId}" /></code></pre>
*
* <p>
* 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>
*
* @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.
* @return the {@link Metadata}.
* @since 2.0
*/
public abstract Metadata applyRule(String name, TagAttribute attribute,
MetadataTarget meta);
}