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   * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
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   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License.  You can
  * obtain a copy of the License at
  * or packager/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
  * When distributing the software, include this License Header Notice in each
  * file and include the License file at packager/legal/LICENSE.txt.
  * GPL Classpath Exception:
  * Oracle designates this particular file as subject to the "Classpath"
  * exception as provided by Oracle in the GPL Version 2 section of the License
  * file that accompanied this code.
  * Modifications:
  * If applicable, add the following below the License Header, with the fields
  * enclosed by brackets [] replaced by your own identifying information:
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  * only the GPL Version 2, indicate your decision by adding "[Contributor]
  * elects to include this software in this distribution under the [CDDL or GPL
  * Version 2] license."  If you don't indicate a single choice of license, a
  * recipient has the option to distribute your version of this file under
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  * its licensees as provided above.  However, if you add GPL Version 2 code
  * and therefore, elected the GPL Version 2 license, then the option applies
  * only if the new code is made subject to such option by the copyright
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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
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  * Unless required by applicable law or agreed to in writing, software
  * 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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  * limitations under the License.
 package javax.faces.view.facelets;

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 javax.faces.component.html.HtmlInputText in the view. HtmlImputText has a number of attributes that are to be exposed to the page author. HtmlInputText also implements javax.faces.component.EditableValueHolder, which extends javax.faces.component.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(javax.faces.view.facelets.FaceletContext,java.lang.Object) method to cause those rules to be executed and applied.

 public abstract class MetaTagHandler extends TagHandler {
    private Class lastType = Object.class;
    private Metadata mapper;
    public MetaTagHandler(TagConfig config) {

Extend this method in order to add your own rules.

    protected abstract MetaRuleset createMetaRuleset(Class type);

Invoking/extending this method will cause the results of the created MetaRuleset to auto-wire state to the passed instance.

    protected void setAttributes(FaceletContext ctxObject instance) {
        if (instance != null) {
            Class type = instance.getClass();
            if ( == null || !this..equals(type)) {
                this. = type;
                this. = this.createMetaRuleset(type).finish();
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