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   * $Id:,v 1.18 2007/01/29 07:29:01 rlubke Exp $
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   * of the Common Development and Distribution License
   * (the License). You may not use this file except in
   * compliance with the License.
  * You can obtain a copy of the License at
  * or
  * legal/CDDLv1.0.txt. 
  * See the License for the specific language governing
  * permission and limitations under the License.
  * When distributing Covered Code, include this CDDL
  * Header Notice in each file and include the License file
  * at legal/CDDLv1.0.txt.    
  * If applicable, add the following below the CDDL Header,
  * with the fields enclosed by brackets [] replaced by
  * your own identifying information:
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  * [Name of File] [ver.__] [Date]
  * Copyright 2005 Sun Microsystems Inc. All Rights Reserved
 package javax.faces.webapp;

Tag implementation that adds an attribute with a specified name and String value to the component whose tag it is nested inside, if the component does not already contain an attribute with the same name. This tag creates no output to the page currently being created.

The Faces implementation must now provide the implementation for this class.
 public class AttributeTag extends TagSupport {
     // ---------------------------------------------------------- Static Members
     private static final long serialVersionUID = -7782950243436672334L;
     // ------------------------------------------------------------- Attributes


The name of the attribute to be created, if not already present.

     private String name = null;


Set the attribute name.

name The new attribute name
     public void setName(String name) {
         this. = name;


The value to be associated with this attribute, if it is created.

     private String value = null;


Set the attribute value.

value The new attribute value
     public void setValue(String value) {
         this. = value;
    // --------------------------------------------------------- Public Methods


Register the specified attribute name and value with the javax.faces.component.UIComponent instance associated with our most immediately surrounding UIComponentTag instance, if this javax.faces.component.UIComponent does not already have a value for the specified attribute name.

javax.servlet.jsp.JspException if a JSP error occurs
    public int doStartTag() throws JspException {
        // Locate our parent UIComponentTag
        UIComponentClassicTagBase tag =
        if (tag == null) { // PENDING - i18n
            throw new JspException("Not nested in a UIComponentTag");
        // Add this attribute if it is not already defined
        UIComponent component = tag.getComponentInstance();
        if (component == null) { // PENDING - i18n
            throw new JspException("No component associated with UIComponentTag");
        FacesContext context = FacesContext.getCurrentInstance();
        ExpressionFactory exprFactory =
        ELContext elContext = context.getELContext();
        String nameVal = (String
        Object valueVal =
        if (component.getAttributes().get(nameVal) == null) {
        return ();
    public int doEndTag() throws JspException {
	return ();


Release references to any acquired resources.

    public void release() {
        this. = null;
        this. = null;
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