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.IterationTag, javax.servlet.jsp.tagext.JspTag, 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: 471754 $ $Date: 2004-10-16 12:38:42 -0400 (Sat, 16 Oct 2004) $

See Also:

Serialized Form

Field Summary

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

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 and Description
EmptyTag()

Method Summary

Modifier and Type	Method and Description
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

doAfterBody, findAncestorWithClass, getId, getParent, getValue, getValues, 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

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.

Specified by:

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