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<h2 title="Interface IterationTag" class="title">Interface IterationTag</h2>
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<dl>
<dt>All Superinterfaces:</dt>
<dd><code><a href="../../../../javax/servlet/jsp/tagext/JspTag.html" title="interface in javax.servlet.jsp.tagext">JspTag</a></code>, <code><a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></code></dd>
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<dt>All Known Subinterfaces:</dt>
<dd><code><a href="../../../../javax/servlet/jsp/tagext/BodyTag.html" title="interface in javax.servlet.jsp.tagext">BodyTag</a></code></dd>
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<dt>All Known Implementing Classes:</dt>
<dd><code><a href="../../../../javax/servlet/jsp/tagext/BodyTagSupport.html" title="class in javax.servlet.jsp.tagext">BodyTagSupport</a></code>, <code><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html" title="class in javax.servlet.jsp.tagext">TagSupport</a></code></dd>
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<pre>public interface <span class="typeNameLabel">IterationTag</span>
extends <a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></pre>
<div class="block">The IterationTag interface extends Tag by defining one additional
method that controls the reevaluation of its body.
<p> A tag handler that implements IterationTag is treated as one that
implements Tag regarding the doStartTag() and doEndTag() methods.
IterationTag provides a new method: <code>doAfterBody()</code>.
<p> The doAfterBody() method is invoked after every body evaluation
to control whether the body will be reevaluated or not. If doAfterBody()
returns IterationTag.EVAL_BODY_AGAIN, then the body will be reevaluated.
If doAfterBody() returns Tag.SKIP_BODY, then the body will be skipped
and doEndTag() will be evaluated instead.
<p><B>Properties</B>
There are no new properties in addition to those in Tag.
<p><B>Methods</B>
There is one new methods: doAfterBody().
<p><B>Lifecycle</B>
<p> Lifecycle details are described by the transition diagram
below. Exceptions that are thrown during the computation of
doStartTag(), BODY and doAfterBody() interrupt the execution
sequence and are propagated up the stack, unless the tag handler
implements the TryCatchFinally interface; see that interface for
details.
<p>
<IMG src="doc-files/IterationTagProtocol.gif" alt="Lifecycle Details Transition Diagram for IterationTag">
<p><B>Empty and Non-Empty Action</B>
<p> If the TagLibraryDescriptor file indicates that the action must
always have an empty element body, by a <body-content> entry of
"empty", then the doStartTag() method must return SKIP_BODY.
<p>Note that which methods are invoked after the doStartTag() depends on
both the return value and on if the custom action element is empty
or not in the JSP page, not on how it's declared in the TLD.
<p>
If SKIP_BODY is returned the body is not evaluated, and then doEndTag()
is invoked.
<p>
If EVAL_BODY_INCLUDE is returned, and the custom action element is not
empty, the body is evaluated and "passed through" to the current out,
then doAfterBody() is invoked and, after zero or more iterations,
doEndTag() is invoked.</div>
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<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/IterationTag.html#EVAL_BODY_AGAIN">EVAL_BODY_AGAIN</a></span></code></th>
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<div class="block">Request the reevaluation of some body.</div>
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<h3>Fields inherited from interface javax.servlet.jsp.tagext.<a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></h3>
<code><a href="../../../../javax/servlet/jsp/tagext/Tag.html#EVAL_BODY_INCLUDE">EVAL_BODY_INCLUDE</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#EVAL_PAGE">EVAL_PAGE</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#SKIP_BODY">SKIP_BODY</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#SKIP_PAGE">SKIP_PAGE</a></code></li>
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<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/IterationTag.html#doAfterBody--">doAfterBody</a></span>()</code></th>
<td class="colLast">
<div class="block">Process body (re)evaluation.</div>
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<h3>Methods inherited from interface javax.servlet.jsp.tagext.<a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></h3>
<code><a href="../../../../javax/servlet/jsp/tagext/Tag.html#doEndTag--">doEndTag</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#doStartTag--">doStartTag</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#getParent--">getParent</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#release--">release</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#setPageContext-javax.servlet.jsp.PageContext-">setPageContext</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#setParent-javax.servlet.jsp.tagext.Tag-">setParent</a></code></li>
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<h4>EVAL_BODY_AGAIN</h4>
<pre>static final int EVAL_BODY_AGAIN</pre>
<div class="block">Request the reevaluation of some body.
Returned from doAfterBody.
For compatibility with JSP 1.1, the value is carefully selected
to be the same as the, now deprecated, BodyTag.EVAL_BODY_TAG,</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#javax.servlet.jsp.tagext.IterationTag.EVAL_BODY_AGAIN">Constant Field Values</a></dd>
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<h4>doAfterBody</h4>
<pre>int doAfterBody()
throws <a href="../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></pre>
<div class="block">Process body (re)evaluation. This method is invoked by the
JSP Page implementation object after every evaluation of
the body into the BodyEvaluation object. The method is
not invoked if there is no body evaluation.
<p>
If doAfterBody returns EVAL_BODY_AGAIN, a new evaluation of the
body will happen (followed by another invocation of doAfterBody).
If doAfterBody returns SKIP_BODY, no more body evaluations will occur,
and the doEndTag method will be invoked.
<p>
If this tag handler implements BodyTag and doAfterBody returns
SKIP_BODY, the value of out will be restored using the popBody
method in pageContext prior to invoking doEndTag.
<p>
The method re-invocations may be lead to different actions because
there might have been some changes to shared state, or because
of external computation.
<p>
The JSP container will resynchronize the values of any AT_BEGIN and
NESTED variables (defined by the associated TagExtraInfo or TLD) after
the invocation of doAfterBody().</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether additional evaluations of the body are desired</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></code> - if an error occurred while processing this tag</dd>
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