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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   *
   * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
   *
   * The contents of this file are subject to the terms of either the GNU
   * 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
  * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
  * 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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  *
  * Contributor(s):
  * If you wish your version of this file to be governed by only the CDDL or
  * 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
  * either the CDDL, the GPL Version 2 or to extend the choice of license to
  * 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
  * holder.
  *
  *
  * This file incorporates work covered by the following copyright and
  * permission notice:
  *
  * 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
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * 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.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 package javax.faces.view.facelets;


Foundation class for FaceletHandlers associated with a markup element in a Facelet document. This class introduces the concept of XML attributes to Facelets. See the constructor documentation for more details.

Since:
2.0
 
 public abstract class TagHandler implements FaceletHandler {

    
 
 
     protected final String tagId;

    

A reference to the Tag instance corresponding to this TagHandler instance.

 
 
     protected final Tag tag;

    

A reference to the FaceletHandler that represents the first nested child of this TagHandler instance.

 
 
     protected final FaceletHandler nextHandler;

    

Every TagHandler instance is associated with a Tag. Each Tag instance has a TagAttributes property, which is simply a collection of TagAttribute instances. Extract and save as protected instance variables the TagConfig.getTagId(), TagConfig.getTag() and TagConfig.getNextHandler() returns from the argument TagConfig. This constructor is only called when the Facelets View is compiled.

Parameters:
config The structure that contains useful to the operation of this instance.
    public TagHandler(TagConfig config) {
        this. = config.getTagId();
        this. = config.getTag();
        this. = config.getNextHandler();
    }

    
Utility method for fetching the appropriate TagAttribute

Parameters:
localName name of attribute
Returns:
TagAttribute if found, otherwise null
    protected final TagAttribute getAttribute(String localName) {
        return this..getAttributes().get(localName);
    }

    
Utility method for fetching a required TagAttribute

Parameters:
localName name of the attribute
Returns:
TagAttribute if found, otherwise error
Throws:
TagException if the attribute was not found
    protected final TagAttribute getRequiredAttribute(String localName)
            throws TagException {
        TagAttribute attr = this.getAttribute(localName);
        if (attr == null) {
            throw new TagException(this."Attribute '" + localName
                    + "' is required");
        }
        return attr;
    }
    
    public String toString() {
        return this..toString();
    }
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