Class ConverterELTag

  • All Implemented Interfaces:
    java.io.Serializable, javax.servlet.jsp.tagext.IterationTag, javax.servlet.jsp.tagext.JspTag, javax.servlet.jsp.tagext.Tag

    public abstract class ConverterELTag
    extends javax.servlet.jsp.tagext.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

      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 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 javax.servlet.jsp.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 javax.servlet.jsp.tagext.Tag
        Overrides:
        doStartTag in class javax.servlet.jsp.tagext.TagSupport
        Throws:
        javax.servlet.jsp.JspException - if a JSP error occurs
      • createConverter

        protected abstract Converter createConverter()
                                              throws javax.servlet.jsp.JspException

        Create and return a new Converter to be registered on our surrounding UIComponent.

        Throws:
        javax.servlet.jsp.JspException - if a new instance cannot be created