Apache Struts API Documentation: Class PresentTag

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org.apache.struts.taglib.logic Class PresentTag

java.lang.Object
  |
  +--javax.servlet.jsp.tagext.TagSupport
        |
        +--org.apache.struts.taglib.logic.ConditionalTagBase
              |
              +--org.apache.struts.taglib.logic.PresentTag

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

Direct Known Subclasses:: NestedPresentTag, NotPresentTag

public class PresentTag
extends ConditionalTagBase

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

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

Field Summary
`static java.lang.String`	`ROLE_DELIMITER`

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
`PresentTag()`

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.
`protected boolean`	`isBeanPresent()` Returns true if the bean given in the `name` attribute is found.
`protected boolean`	`isCookiePresent(javax.servlet.http.HttpServletRequest request)` Returns true if the cookie is present in the request.

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

Field Detail

ROLE_DELIMITER

public static final java.lang.String ROLE_DELIMITER

Constructor Detail

PresentTag

public PresentTag()

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