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Java Enterprise Edition (EE)

ConverterELTag


javax.faces.webapp
Class ConverterELTag

java.lang.Object
  javax.servlet.jsp.tagext.TagSupport
      javax.faces.webapp.ConverterELTag
All Implemented Interfaces:
java.io.Serializable, 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 class javax.servlet.jsp.tagext.TagSupport
id, pageContext
 
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
 
Constructor Summary
ConverterELTag()
           
 
Method Summary
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 javax.servlet.jsp.tagext.TagSupport
doAfterBody, doEndTag, findAncestorWithClass, getId, getParent, getValue, getValues, release, removeValue, setId, setPageContext, setParent, setValue
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

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.

Throws:
JspException - if a new instance cannot be created


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