ValidatorELTag (Java EE 8)

java.lang.Object
- javax.servlet.jsp.tagext.TagSupport
- - javax.faces.webapp.ValidatorELTag

All Implemented Interfaces:

IterationTag, JspTag, Tag
```
public abstract class ValidatorELTag
extends TagSupport
```
ValidatorELTag is a base class for all JSP custom actions that create and register a Validator instance on the 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 Validator occurs only if the corresponding 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 Validator subclasses.

Subclasses of this class must implement the createValidator() method, which creates and returns a Validator instance. Any configuration properties that specify the limits to be enforced by this 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 Validator creation.

See Also:

Serialized Form

Field Summary
- Fields inherited from interface javax.servlet.jsp.tagext.IterationTag
  EVAL_BODY_AGAIN
- Fields inherited from interface javax.servlet.jsp.tagext.Tag
  EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE
- Fields inherited from class javax.servlet.jsp.tagext.TagSupport
  id, pageContext

Constructor Summary

Constructors
Constructor Description

ValidatorELTag()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected abstract Validator`	`createValidator()`	Create and return a new `Validator` to be registered on our surrounding `UIComponent`.
`int`	`doStartTag()`	Create a new instance of the specified `Validator` class, and register it with the `UIComponent` instance associated with our most immediately surrounding `UIComponentTagBase` instance, if the `UIComponent` instance was created by this execution of the containing JSP page.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from class javax.servlet.jsp.tagext.TagSupport
doAfterBody, doEndTag, findAncestorWithClass, getId, getParent, getValue, getValues, release, removeValue, setId, setPageContext, setParent, setValue

- Constructor Detail
  - ValidatorELTag
```
public ValidatorELTag()
```
- Method Detail
  - doStartTag
```
public int doStartTag()
               throws JspException
```
    Create a new instance of the specified Validator class, and register it with the UIComponent instance associated with our most immediately surrounding UIComponentTagBase instance, if the UIComponent instance was created by this execution of the containing JSP page.
    
    Specified by:
    
    doStartTag in interface Tag
    
    Overrides:
    
    doStartTag in class TagSupport
    
    Returns:
    
    SKIP_BODY
    
    Throws:
    
    JspException - if a JSP error occurs
    
    See Also:
    
    Tag.doStartTag()
  - createValidator
```
protected abstract Validator createValidator()
                                      throws JspException
```
    Create and return a new Validator to be registered on our surrounding UIComponent.
    
    Returns:
    
    the created Validator
    
    Throws:
    
    JspException - if a new instance cannot be created