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  /*
   * $Id: ValidatorELTag.java,v 1.5 2007/04/27 22:00:12 ofung Exp $
   */
  
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  * may not use this file except in compliance with the License. You can obtain
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 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.

Throws:
javax.servlet.jsp.JspException if a JSP error occurs
 
     public int doStartTag() throws JspException {
         
         // Locate our parent UIComponentTag
         UIComponentClassicTagBase tag =
              UIComponentClassicTagBase.getParentUIComponentClassicTagBase();
         if (tag == null) { 
        	    //PENDING i18n
             throw new JspException("Not nested in a UIComponentTag Error for tag with handler class:"+
                    this.getClass().getName());
        }
        // 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:"+
                    this.getClass().getName());
        }
        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
        ((EditableValueHolder)component).addValidator(validator);
        
        return ();
    }
    // ------------------------------------------------------ Protected Methods


    

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

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