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  * or packager/legal/LICENSE.txt.  See the License for the specific
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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;

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.

 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.

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

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

Utility method for fetching a required TagAttribute

localName name of the attribute
TagAttribute if found, otherwise error
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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