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  /*
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  * This file incorporates work covered by the following copyright and
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  * Copyright 2005-2007 The Apache Software Foundation
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  * Licensed under the Apache License, Version 2.0 (the "License");
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  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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  */
 
 package javax.faces.view.facelets;


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, applyRule(java.lang.String,javax.faces.view.facelets.TagAttribute,javax.faces.view.facelets.MetadataTarget), 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.

For example, consider this markup:

<h:inputText value="#{user.userid}" 
valueChangeListener="#{user.newUserId}" />
Two MetaRule instances are involved in this example.
  1. The first has an applyRule() method that returns a Metadata instance that, when its applyMetada() method is called, dictates how the "value" attribute is processed: calling javax.faces.component.UIComponent.setValueExpression(java.lang.String,javax.el.ValueExpression) on the UIComponent instance associated with the <h:inputText> element.

  2. The second has an applyRule() method that returns a Metadata instance that, when its applyMetadata() method is called, dictates how the "valueChangeListener" attribute is processed: calling javax.faces.component.EditableValueHolder.addValueChangeListener(javax.faces.event.ValueChangeListener).

Since:
2.0
public abstract class MetaRule {

    
    

Return an abstraction that takes appropriate action given the kind of rule represented by the argument name, in the context of this particular concrete subclass of MetaRule. The abstraction must encapsulate the value from the argument attribute.

Parameters:
name the name for this rule. This will generally be the name of a tag attribute in the VDL.
attribute the name/value pair for this attribute on this particular instance of an element in the page.
meta the MetadataTarged that can be used to discern what kind of action to encapsulate within the abstraction to be returned.
Since:
2.0
    public abstract Metadata applyRule(String nameTagAttribute attribute,
            MetadataTarget meta);
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