Class ValidatorELTag

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

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

      • ValidatorELTag

        public ValidatorELTag()
    • Method Detail

      • doStartTag

        public int doStartTag()
                       throws javax.servlet.jsp.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 javax.servlet.jsp.tagext.Tag
        Overrides:
        doStartTag in class javax.servlet.jsp.tagext.TagSupport
        Throws:
        javax.servlet.jsp.JspException - if a JSP error occurs
      • createValidator

        protected abstract Validator createValidator()
                                              throws javax.servlet.jsp.JspException

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

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