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   * $Id:,v 1.5 2007/04/27 22:00:12 ofung Exp $
   * Copyright 1997-2007 Sun Microsystems, Inc. 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
  * or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
  * Sun designates this particular file as subject to the "Classpath" exception
  * as provided by Sun in the GPL Version 2 section of the License file that
  * accompanied this code.  If applicable, add the following below the License
  * Header, with the fields enclosed by brackets [] replaced by your own
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  * holder.
 package javax.faces.webapp;

ValidatorELTag is a base class for all JSP custom actions that create and register a Validator instance on the javax.faces.component.EditableValueHolder associated with our most immediate surrounding instance of a tag whose implementation class is a subclass of UIComponentTag. To avoid creating duplicate instances when a page is redisplayed, creation and registration of a javax.faces.validator.Validator occurs only if the corresponding javax.faces.component.UIComponent was created (by the owning UIComponentTagBase) during the execution of the current page.

This class must be used as a base class for tag instances that support specific javax.faces.validator.Validator subclasses.

Subclasses of this class must implement the createValidator() method, which creates and returns a javax.faces.validator.Validator instance. Any configuration properties that specify the limits to be enforced by this javax.faces.validator.Validator must have been set by the createValidator() method. Generally, this occurs by copying corresponding attribute values on the tag instance.

This tag creates no output to the page currently being created. It is used solely for the side effect of javax.faces.validator.Validator creation.

 public abstract class ValidatorELTag extends TagSupport {
     // --------------------------------------------------------- Public Methods


Create a new instance of the specified javax.faces.validator.Validator class, and register it with the javax.faces.component.UIComponent instance associated with our most immediately surrounding UIComponentTagBase instance, if the javax.faces.component.UIComponent instance was created by this execution of the containing JSP page.

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 Error for tag with handler class:"+
        // Nothing to do unless this tag created a component
        if (!tag.getCreated()) {
            return ();
        UIComponent component = tag.getComponentInstance();
        if (component == null) {            
            //PENDING i18n
            throw new JspException("Can't create Component from tag.");
        if (!(component instanceof EditableValueHolder)) {
            // PENDING i18n
            throw new JspException("Not nested in a tag of proper type. Error for tag with handler class:"+
        Validator validator = createValidator();
        if (validator == null) {
            // PENDING i18n
            throw new JspException("Can't create class of type:"+
                " javax.faces.validator.Validator.  Validator is null");
        // Register an instance with the appropriate component
        return ();
    // ------------------------------------------------------ Protected Methods


Create and return a new javax.faces.validator.Validator to be registered on our surrounding javax.faces.component.UIComponent.

javax.servlet.jsp.JspException if a new instance cannot be created
    protected abstract Validator createValidator()
        throws JspException;
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