ConverterELTag (Java EE 8)

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

All Implemented Interfaces:

IterationTag, JspTag, Tag
```
public abstract class ConverterELTag
extends TagSupport
```
ConverterELTag is a base class for all JSP custom actions that create and register a Converter instance on the ValueHolder associated with our most immediate surrounding instance of a tag whose implementation class is a subclass of UIComponentClassicTagBase. To avoid creating duplicate instances when a page is redisplayed, creation and registration of a Converter occurs only if the corresponding UIComponent was created (by the owning UIComponentTag) during the execution of the current page.

This class may be used as a base class for tag instances that support specific Converter subclasses.

Subclasses of this class must implement the createConverter() method, which creates and returns a Converter instance. Any configuration properties that specify behavior of this Converter must have been set by the createConverter() 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 Converter 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

ConverterELTag()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected abstract Converter`	`createConverter()`	Create and return a new `Converter` to be registered on our surrounding `UIComponent`.
`int`	`doStartTag()`	Create a new instance of the specified `Converter` class, and register it with the `UIComponent` instance associated with our most immediately surrounding `UIComponentClassicTagBase` 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
  - ConverterELTag
```
public ConverterELTag()
```
- Method Detail
  - doStartTag
```
public int doStartTag()
               throws JspException
```
    Create a new instance of the specified Converter class, and register it with the UIComponent instance associated with our most immediately surrounding UIComponentClassicTagBase instance, if the UIComponent instance was created by this execution of the containing JSP page. If the localValue of the UIComponent is a String, attempt to convert it.
    
    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()
  - createConverter
```
protected abstract Converter createConverter()
                                      throws JspException
```
    Create and return a new Converter to be registered on our surrounding UIComponent.
    
    Returns:
    
    the Converter
    
    Throws:
    
    JspException - if a new instance cannot be created