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Viewing changes to legacy/api-1.1/org/apache/struts/taglib/logic/PresentTag.html

  • Committer: Bazaar Package Importer
  • Author(s): Arnaud Vandyck
  • Date: 2004-11-19 15:35:25 UTC
  • Revision ID: james.westby@ubuntu.com-20041119153525-mdu08a76z4zo67xt
Tags: upstream-1.2.4
Import upstream version 1.2.4

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legacy/api-1.1/org/apache/struts/taglib/logic/PresentTag.html
 
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN""http://www.w3.org/TR/REC-html40/loose.dtd">
 
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<!--NewPage-->
 
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<HTML>
 
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<HEAD>
 
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<!-- Generated by javadoc on Fri Aug 22 03:44:05 EDT 2003 -->
 
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<TITLE>
 
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PresentTag (Apache Struts API Documentation)
 
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</TITLE>
 
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<META NAME="keywords" CONTENT="org.apache.struts.taglib.logic.PresentTag,PresentTag class">
 
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<LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../../stylesheet.css" TITLE="Style">
 
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</HEAD>
 
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<SCRIPT>
 
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function asd()
 
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{
 
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parent.document.title="PresentTag (Apache Struts API Documentation)";
 
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}
 
17
</SCRIPT>
 
18
<BODY BGCOLOR="white" onload="asd();">
 
19
 
 
20
<!-- ========== START OF NAVBAR ========== -->
 
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<A NAME="navbar_top"><!-- --></A>
 
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<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0">
 
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<TR>
 
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<TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1">
 
25
<A NAME="navbar_top_firstrow"><!-- --></A>
 
26
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3">
 
27
  <TR ALIGN="center" VALIGN="top">
 
28
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
 
29
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>
 
30
  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT>&nbsp;</TD>
 
31
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/PresentTag.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
 
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  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
 
33
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>
 
34
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A>&nbsp;</TD>
 
35
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A>&nbsp;</TD>
 
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  </TR>
 
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</TABLE>
 
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</TD>
 
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<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
 
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</EM>
 
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</TD>
 
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</TR>
 
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<TR>
 
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<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
 
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&nbsp;<A HREF="../../../../../org/apache/struts/taglib/logic/NotPresentTag.html"><B>PREV CLASS</B></A>&nbsp;
 
47
&nbsp;<A HREF="../../../../../org/apache/struts/taglib/logic/RedirectTag.html"><B>NEXT CLASS</B></A></FONT></TD>
 
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<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
 
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  <A HREF="../../../../../index.html" TARGET="_top"><B>FRAMES</B></A>  &nbsp;
 
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&nbsp;<A HREF="PresentTag.html" TARGET="_top"><B>NO FRAMES</B></A>  &nbsp;
 
51
&nbsp;
 
52
<SCRIPT>
 
53
  <!--
 
54
  if(window==top) {
 
55
    document.writeln('<A HREF="../../../../../allclasses-noframe.html" TARGET=""><B>All Classes</B></A>');
 
56
  }
 
57
  //-->
 
58
</SCRIPT>
 
59
<NOSCRIPT>
 
60
<A HREF="../../../../../allclasses-noframe.html" TARGET=""><B>All Classes</B></A>
 
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</NOSCRIPT>
 
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</FONT></TD>
 
63
</TR>
 
64
<TR>
 
65
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
 
66
  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
 
67
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
 
68
DETAIL:&nbsp;<A HREF="#field_detail">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_detail">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_detail">METHOD</A></FONT></TD>
 
69
</TR>
 
70
</TABLE>
 
71
<!-- =========== END OF NAVBAR =========== -->
 
72
 
 
73
<HR>
 
74
<!-- ======== START OF CLASS DATA ======== -->
 
75
<H2>
 
76
<FONT SIZE="-1">
 
77
org.apache.struts.taglib.logic</FONT>
 
78
<BR>
 
79
Class PresentTag</H2>
 
80
<PRE>
 
81
java.lang.Object
 
82
  |
 
83
  +--javax.servlet.jsp.tagext.TagSupport
 
84
        |
 
85
        +--<A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html">org.apache.struts.taglib.logic.ConditionalTagBase</A>
 
86
              |
 
87
              +--<B>org.apache.struts.taglib.logic.PresentTag</B>
 
88
</PRE>
 
89
<DL>
 
90
<DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable, javax.servlet.jsp.tagext.Tag</DD>
 
91
</DL>
 
92
<DL>
 
93
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../org/apache/struts/taglib/nested/logic/NestedPresentTag.html">NestedPresentTag</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/NotPresentTag.html">NotPresentTag</A></DD>
 
94
</DL>
 
95
<HR>
 
96
<DL>
 
97
<DT>public class <B>PresentTag</B><DT>extends <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html">ConditionalTagBase</A></DL>
 
98
 
 
99
<P>
 
100
Evalute the nested body content of this tag if the specified value
 
101
 is present for this request.
 
102
<P>
 
103
 
 
104
<P>
 
105
<DL>
 
106
<DT><B>Version:</B></DT>
 
107
  <DD>$Revision: 1.1 $ $Date: 2003/08/26 12:57:40 $</DD>
 
108
<DT><B>Author:</B></DT>
 
109
  <DD>Craig R. McClanahan</DD>
 
110
<DT><B>See Also:</B><DD><A HREF="../../../../../serialized-form.html" TARGET="org.apache.struts.taglib.logic.PresentTag">Serialized Form</A></DL>
 
111
<HR>
 
112
 
 
113
<P>
 
114
<!-- ======== NESTED CLASS SUMMARY ======== -->
 
115
 
 
116
 
 
117
<!-- =========== FIELD SUMMARY =========== -->
 
118
 
 
119
<A NAME="field_summary"><!-- --></A>
 
120
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
121
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
 
122
<TD COLSPAN=2><FONT SIZE="+2">
 
123
<B>Field Summary</B></FONT></TD>
 
124
</TR>
 
125
<TR BGCOLOR="white" CLASS="TableRowColor">
 
126
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 
127
<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
 
128
<TD><CODE><B><A HREF="../../../../../org/apache/struts/taglib/logic/PresentTag.html#ROLE_DELIMITER">ROLE_DELIMITER</A></B></CODE>
 
129
 
 
130
<BR>
 
131
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
 
132
</TR>
 
133
</TABLE>
 
134
&nbsp;<A NAME="fields_inherited_from_class_org.apache.struts.taglib.logic.ConditionalTagBase"><!-- --></A>
 
135
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
136
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
 
137
<TD><B>Fields inherited from class org.apache.struts.taglib.logic.<A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html">ConditionalTagBase</A></B></TD>
 
138
</TR>
 
139
<TR BGCOLOR="white" CLASS="TableRowColor">
 
140
<TD><CODE><A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#cookie">cookie</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#header">header</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#messages">messages</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#name">name</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#parameter">parameter</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#property">property</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#role">role</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#scope">scope</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#user">user</A></CODE></TD>
 
141
</TR>
 
142
</TABLE>
 
143
&nbsp;<A NAME="fields_inherited_from_class_javax.servlet.jsp.tagext.TagSupport"><!-- --></A>
 
144
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
145
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
 
146
<TD><B>Fields inherited from class javax.servlet.jsp.tagext.TagSupport</B></TD>
 
147
</TR>
 
148
<TR BGCOLOR="white" CLASS="TableRowColor">
 
149
<TD><CODE>id, pageContext</CODE></TD>
 
150
</TR>
 
151
</TABLE>
 
152
&nbsp;<A NAME="fields_inherited_from_class_javax.servlet.jsp.tagext.Tag"><!-- --></A>
 
153
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
154
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
 
155
<TD><B>Fields inherited from interface javax.servlet.jsp.tagext.Tag</B></TD>
 
156
</TR>
 
157
<TR BGCOLOR="white" CLASS="TableRowColor">
 
158
<TD><CODE>EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE</CODE></TD>
 
159
</TR>
 
160
</TABLE>
 
161
&nbsp;
 
162
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
 
163
 
 
164
<A NAME="constructor_summary"><!-- --></A>
 
165
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
166
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
 
167
<TD COLSPAN=2><FONT SIZE="+2">
 
168
<B>Constructor Summary</B></FONT></TD>
 
169
</TR>
 
170
<TR BGCOLOR="white" CLASS="TableRowColor">
 
171
<TD><CODE><B><A HREF="../../../../../org/apache/struts/taglib/logic/PresentTag.html#PresentTag()">PresentTag</A></B>()</CODE>
 
172
 
 
173
<BR>
 
174
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
 
175
</TR>
 
176
</TABLE>
 
177
&nbsp;
 
178
<!-- ========== METHOD SUMMARY =========== -->
 
179
 
 
180
<A NAME="method_summary"><!-- --></A>
 
181
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
182
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
 
183
<TD COLSPAN=2><FONT SIZE="+2">
 
184
<B>Method Summary</B></FONT></TD>
 
185
</TR>
 
186
<TR BGCOLOR="white" CLASS="TableRowColor">
 
187
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 
188
<CODE>protected &nbsp;boolean</CODE></FONT></TD>
 
189
<TD><CODE><B><A HREF="../../../../../org/apache/struts/taglib/logic/PresentTag.html#condition()">condition</A></B>()</CODE>
 
190
 
 
191
<BR>
 
192
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Evaluate the condition that is being tested by this particular tag,
 
193
 and return <code>true</code> if the nested body content of this tag
 
194
 should be evaluated, or <code>false</code> if it should be skipped.</TD>
 
195
</TR>
 
196
<TR BGCOLOR="white" CLASS="TableRowColor">
 
197
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 
198
<CODE>protected &nbsp;boolean</CODE></FONT></TD>
 
199
<TD><CODE><B><A HREF="../../../../../org/apache/struts/taglib/logic/PresentTag.html#condition(boolean)">condition</A></B>(boolean&nbsp;desired)</CODE>
 
200
 
 
201
<BR>
 
202
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Evaluate the condition that is being tested by this particular tag,
 
203
 and return <code>true</code> if the nested body content of this tag
 
204
 should be evaluated, or <code>false</code> if it should be skipped.</TD>
 
205
</TR>
 
206
</TABLE>
 
207
&nbsp;<A NAME="methods_inherited_from_class_org.apache.struts.taglib.logic.ConditionalTagBase"><!-- --></A>
 
208
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
209
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
 
210
<TD><B>Methods inherited from class org.apache.struts.taglib.logic.<A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html">ConditionalTagBase</A></B></TD>
 
211
</TR>
 
212
<TR BGCOLOR="white" CLASS="TableRowColor">
 
213
<TD><CODE><A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#doEndTag()">doEndTag</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#doStartTag()">doStartTag</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#getCookie()">getCookie</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#getHeader()">getHeader</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#getName()">getName</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#getParameter()">getParameter</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#getProperty()">getProperty</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#getRole()">getRole</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#getScope()">getScope</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#getUser()">getUser</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#release()">release</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#setCookie(java.lang.String)">setCookie</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#setHeader(java.lang.String)">setHeader</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#setName(java.lang.String)">setName</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#setParameter(java.lang.String)">setParameter</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#setProperty(java.lang.String)">setProperty</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#setRole(java.lang.String)">setRole</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#setScope(java.lang.String)">setScope</A>, <A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#setUser(java.lang.String)">setUser</A></CODE></TD>
 
214
</TR>
 
215
</TABLE>
 
216
&nbsp;<A NAME="methods_inherited_from_class_javax.servlet.jsp.tagext.TagSupport"><!-- --></A>
 
217
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
218
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
 
219
<TD><B>Methods inherited from class javax.servlet.jsp.tagext.TagSupport</B></TD>
 
220
</TR>
 
221
<TR BGCOLOR="white" CLASS="TableRowColor">
 
222
<TD><CODE>findAncestorWithClass, getId, getParent, getValue, getValues, removeValue, setId, setPageContext, setParent, setValue</CODE></TD>
 
223
</TR>
 
224
</TABLE>
 
225
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
 
226
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
227
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
 
228
<TD><B>Methods inherited from class java.lang.Object</B></TD>
 
229
</TR>
 
230
<TR BGCOLOR="white" CLASS="TableRowColor">
 
231
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
 
232
</TR>
 
233
</TABLE>
 
234
&nbsp;
 
235
<P>
 
236
 
 
237
<!-- ============ FIELD DETAIL =========== -->
 
238
 
 
239
<A NAME="field_detail"><!-- --></A>
 
240
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
241
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
 
242
<TD COLSPAN=1><FONT SIZE="+2">
 
243
<B>Field Detail</B></FONT></TD>
 
244
</TR>
 
245
</TABLE>
 
246
 
 
247
<A NAME="ROLE_DELIMITER"><!-- --></A><H3>
 
248
ROLE_DELIMITER</H3>
 
249
<PRE>
 
250
public static final java.lang.String <B>ROLE_DELIMITER</B></PRE>
 
251
<DL>
 
252
<DL>
 
253
<DT><B>See Also:</B><DD><A HREF="../../../../../constant-values.html#org.apache.struts.taglib.logic.PresentTag.ROLE_DELIMITER">Constant Field Values</A></DL>
 
254
</DL>
 
255
 
 
256
<!-- ========= CONSTRUCTOR DETAIL ======== -->
 
257
 
 
258
<A NAME="constructor_detail"><!-- --></A>
 
259
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
260
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
 
261
<TD COLSPAN=1><FONT SIZE="+2">
 
262
<B>Constructor Detail</B></FONT></TD>
 
263
</TR>
 
264
</TABLE>
 
265
 
 
266
<A NAME="PresentTag()"><!-- --></A><H3>
 
267
PresentTag</H3>
 
268
<PRE>
 
269
public <B>PresentTag</B>()</PRE>
 
270
<DL>
 
271
</DL>
 
272
 
 
273
<!-- ============ METHOD DETAIL ========== -->
 
274
 
 
275
<A NAME="method_detail"><!-- --></A>
 
276
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
 
277
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
 
278
<TD COLSPAN=1><FONT SIZE="+2">
 
279
<B>Method Detail</B></FONT></TD>
 
280
</TR>
 
281
</TABLE>
 
282
 
 
283
<A NAME="condition()"><!-- --></A><H3>
 
284
condition</H3>
 
285
<PRE>
 
286
protected boolean <B>condition</B>()
 
287
                     throws javax.servlet.jsp.JspException</PRE>
 
288
<DL>
 
289
<DD>Evaluate the condition that is being tested by this particular tag,
 
290
 and return <code>true</code> if the nested body content of this tag
 
291
 should be evaluated, or <code>false</code> if it should be skipped.
 
292
 This method must be implemented by concrete subclasses.
 
293
<P>
 
294
<DD><DL>
 
295
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html#condition()">condition</A></CODE> in class <CODE><A HREF="../../../../../org/apache/struts/taglib/logic/ConditionalTagBase.html">ConditionalTagBase</A></CODE></DL>
 
296
</DD>
 
297
<DD><DL>
 
298
 
 
299
<DT><B>Throws:</B>
 
300
<DD><CODE>javax.servlet.jsp.JspException</CODE> - if a JSP exception occurs</DL>
 
301
</DD>
 
302
</DL>
 
303
<HR>
 
304
 
 
305
<A NAME="condition(boolean)"><!-- --></A><H3>
 
306
condition</H3>
 
307
<PRE>
 
308
protected boolean <B>condition</B>(boolean&nbsp;desired)
 
309
                     throws javax.servlet.jsp.JspException</PRE>
 
310
<DL>
 
311
<DD>Evaluate the condition that is being tested by this particular tag,
 
312
 and return <code>true</code> if the nested body content of this tag
 
313
 should be evaluated, or <code>false</code> if it should be skipped.
 
314
 This method must be implemented by concrete subclasses.
 
315
<P>
 
316
<DD><DL>
 
317
<DT><B>Parameters:</B><DD><CODE>desired</CODE> - Desired outcome for a true result
 
318
<DT><B>Throws:</B>
 
319
<DD><CODE>javax.servlet.jsp.JspException</CODE> - if a JSP exception occurs</DL>
 
320
</DD>
 
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