org.apache.struts.taglib.logic
Class EmptyTag

java.lang.Object
  |
  +--javax.servlet.jsp.tagext.TagSupport
        |
        +--org.apache.struts.taglib.logic.ConditionalTagBase
              |
              +--org.apache.struts.taglib.logic.EmptyTag
All Implemented Interfaces:
java.io.Serializable, javax.servlet.jsp.tagext.Tag
Direct Known Subclasses:
NestedEmptyTag, NotEmptyTag

public class EmptyTag
extends ConditionalTagBase

Evalute the nested body content of this tag if the specified value is empty for this request.

Since:
Struts 1.1
Version:
$Rev: 54929 $ $Date: 2004-10-16 17:38:42 +0100 (Sat, 16 Oct 2004) $
See Also:
Serialized Form

Fields inherited from class org.apache.struts.taglib.logic.ConditionalTagBase
cookie, header, messages, name, parameter, property, role, scope, user
 
Fields inherited from class javax.servlet.jsp.tagext.TagSupport
id, pageContext, parent, values
 
Fields inherited from interface javax.servlet.jsp.tagext.Tag
EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE
 
Constructor Summary
EmptyTag()
           
 
Method Summary
protected  boolean condition()
          Evaluate the condition that is being tested by this particular tag, and return true if the nested body content of this tag should be evaluated, or false if it should be skipped.
protected  boolean condition(boolean desired)
          Evaluate the condition that is being tested by this particular tag, and return true if the nested body content of this tag should be evaluated, or false if it should be skipped.
 
Methods inherited from class org.apache.struts.taglib.logic.ConditionalTagBase
doEndTag, doStartTag, getCookie, getHeader, getName, getParameter, getProperty, getRole, getScope, getUser, release, setCookie, setHeader, setName, setParameter, setProperty, setRole, setScope, setUser
 
Methods inherited from class javax.servlet.jsp.tagext.TagSupport
findAncestorWithClass, getId, getParent, getValue, getValues, removeValue, setId, setPageContext, setParent, setValue
 
Methods inherited from class java.lang.Object
, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait
 

Constructor Detail

EmptyTag

public EmptyTag()
Method Detail

condition

protected boolean condition()
                     throws javax.servlet.jsp.JspException
Evaluate the condition that is being tested by this particular tag, and return true if the nested body content of this tag should be evaluated, or false if it should be skipped. This method must be implemented by concrete subclasses.
Overrides:
condition in class ConditionalTagBase
Throws:
javax.servlet.jsp.JspException - if a JSP exception occurs

condition

protected boolean condition(boolean desired)
                     throws javax.servlet.jsp.JspException
Evaluate the condition that is being tested by this particular tag, and return true if the nested body content of this tag should be evaluated, or false if it should be skipped. This method must be implemented by concrete subclasses.
Parameters:
desired - Desired outcome for a true result
Throws:
javax.servlet.jsp.JspException - if a JSP exception occurs


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