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title="class in org.apache.taglibs.standard.tag.el.core">UrlTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/common/xml/WhenTag.html" title="class in org.apache.taglibs.standard.tag.common.xml">WhenTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/rt/core/WhenTag.html" title="class in org.apache.taglibs.standard.tag.rt.core">WhenTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/el/core/WhenTag.html" title="class in org.apache.taglibs.standard.tag.el.core">WhenTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/common/core/WhenTagSupport.html" title="class in org.apache.taglibs.standard.tag.common.core">WhenTagSupport</a></dd>
</dl>
<hr>
<br>
<pre>public interface <span class="typeNameLabel">Tag</span>
extends <a href="../../../../javax/servlet/jsp/tagext/JspTag.html" title="interface in javax.servlet.jsp.tagext">JspTag</a></pre>
<div class="block">The interface of a classic tag handler that does not want to manipulate its body. The Tag interface defines the basic
protocol between a Tag handler and JSP page implementation class. It defines the life cycle and the methods to be
invoked at start and end tag.
<p>
<B>Properties</B>
</p>
<p>
The Tag interface specifies the setter and getter methods for the core pageContext and parent properties.
</p>
<p>
The JSP page implementation object invokes setPageContext and setParent, in that order, before invoking doStartTag()
or doEndTag().
</p>
<p>
<B>Methods</B>
</p>
<p>
There are two main actions: doStartTag and doEndTag. Once all appropriate properties have been initialized, the
doStartTag and doEndTag methods can be invoked on the tag handler. Between these invocations, the tag handler is
assumed to hold a state that must be preserved. After the doEndTag invocation, the tag handler is available for
further invocations (and it is expected to have retained its properties).
</p>
<p>
<B>Lifecycle</B>
</p>
<p>
Lifecycle details are described by the transition diagram below, with the following comments:
</p>
<ul>
<li>[1] This transition is intended to be for releasing long-term data. no guarantees are assumed on whether any
properties have been retained or not.
<li>[2] This transition happens if and only if the tag ends normally without raising an exception
<li>[3] Some setters may be called again before a tag handler is reused. For instance, <code>setParent()</code> is
called if it's reused within the same page but at a different level, <code>setPageContext()</code> is called if it's
used in another page, and attribute setters are called if the values differ or are expressed as request-time
attribute values.
<li>Check the TryCatchFinally interface for additional details related to exception handling and resource management.
</ul>
<IMG src="doc-files/TagProtocol.gif" alt="Lifecycle Details Transition Diagram for Tag">
<p>
Once all invocations on the tag handler are completed, the release method is invoked on it. Once a release method is
invoked <em>all</em> properties, including parent and pageContext, are assumed to have been reset to an unspecified
value. The page compiler guarantees that release() will be invoked on the Tag handler before the handler is released
to the GC.
</p>
<p>
<B>Empty and Non-Empty Action</B>
</p>
<p>
If the TagLibraryDescriptor file indicates that the action must always have an empty action, by an
&lt;body-content&gt; entry of "empty", then the doStartTag() method must return SKIP_BODY.
</p>
<p>
Otherwise, the doStartTag() method may return SKIP_BODY or EVAL_BODY_INCLUDE.
</p>
<p>
If SKIP_BODY is returned the body, if present, is not evaluated.
</p>
<p>
If EVAL_BODY_INCLUDE is returned, the body is evaluated and "passed through" to the current out.
</p></div>
</li>
</ul>
</div>
<div class="summary">
<ul class="blockList">
<li class="blockList">
<!-- =========== FIELD SUMMARY =========== -->
<ul class="blockList">
<li class="blockList"><a name="field.summary">
<!-- -->
</a>
<h3>Field Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/Tag.html#EVAL_BODY_INCLUDE">EVAL_BODY_INCLUDE</a></span></code>
<div class="block">Evaluate body into existing out stream.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/Tag.html#EVAL_PAGE">EVAL_PAGE</a></span></code>
<div class="block">Continue evaluating the page.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/Tag.html#SKIP_BODY">SKIP_BODY</a></span></code>
<div class="block">Skip body evaluation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/Tag.html#SKIP_PAGE">SKIP_PAGE</a></span></code>
<div class="block">Skip the rest of the page.</div>
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<!-- ========== METHOD SUMMARY =========== -->
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/Tag.html#doEndTag--">doEndTag</a></span>()</code>
<div class="block">Process the end tag for this instance.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/Tag.html#doStartTag--">doStartTag</a></span>()</code>
<div class="block">Process the start tag for this instance.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/Tag.html#getParent--">getParent</a></span>()</code>
<div class="block">Get the parent (closest enclosing tag handler) for this tag handler.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/Tag.html#release--">release</a></span>()</code>
<div class="block">Called on a Tag handler to release state.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/Tag.html#setPageContext-javax.servlet.jsp.PageContext-">setPageContext</a></span>(<a href="../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</a>&nbsp;pc)</code>
<div class="block">Set the current page context.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/Tag.html#setParent-javax.servlet.jsp.tagext.Tag-">setParent</a></span>(<a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a>&nbsp;t)</code>
<div class="block">Set the parent (closest enclosing tag handler) of this tag handler.</div>
</td>
</tr>
</table>
</li>
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</li>
</ul>
</div>
<div class="details">
<ul class="blockList">
<li class="blockList">
<!-- ============ FIELD DETAIL =========== -->
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<h3>Field Detail</h3>
<a name="SKIP_BODY">
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<ul class="blockList">
<li class="blockList">
<h4>SKIP_BODY</h4>
<pre>static final&nbsp;int SKIP_BODY</pre>
<div class="block">Skip body evaluation. Valid return value for doStartTag and doAfterBody.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#javax.servlet.jsp.tagext.Tag.SKIP_BODY">Constant Field Values</a></dd>
</dl>
</li>
</ul>
<a name="EVAL_BODY_INCLUDE">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>EVAL_BODY_INCLUDE</h4>
<pre>static final&nbsp;int EVAL_BODY_INCLUDE</pre>
<div class="block">Evaluate body into existing out stream. Valid return value for doStartTag.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#javax.servlet.jsp.tagext.Tag.EVAL_BODY_INCLUDE">Constant Field Values</a></dd>
</dl>
</li>
</ul>
<a name="SKIP_PAGE">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>SKIP_PAGE</h4>
<pre>static final&nbsp;int SKIP_PAGE</pre>
<div class="block">Skip the rest of the page. Valid return value for doEndTag.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#javax.servlet.jsp.tagext.Tag.SKIP_PAGE">Constant Field Values</a></dd>
</dl>
</li>
</ul>
<a name="EVAL_PAGE">
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</a>
<ul class="blockListLast">
<li class="blockList">
<h4>EVAL_PAGE</h4>
<pre>static final&nbsp;int EVAL_PAGE</pre>
<div class="block">Continue evaluating the page. Valid return value for doEndTag().</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#javax.servlet.jsp.tagext.Tag.EVAL_PAGE">Constant Field Values</a></dd>
</dl>
</li>
</ul>
</li>
</ul>
<!-- ============ METHOD DETAIL ========== -->
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<h3>Method Detail</h3>
<a name="setPageContext-javax.servlet.jsp.PageContext-">
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<ul class="blockList">
<li class="blockList">
<h4>setPageContext</h4>
<pre>void&nbsp;setPageContext(<a href="../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</a>&nbsp;pc)</pre>
<div class="block">Set the current page context. This method is invoked by the JSP page implementation object prior to doStartTag().
<p>
This value is *not* reset by doEndTag() and must be explicitly reset by a page implementation if it changes
between calls to doStartTag().</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>pc</code> - The page context for this tag handler.</dd>
</dl>
</li>
</ul>
<a name="setParent-javax.servlet.jsp.tagext.Tag-">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>setParent</h4>
<pre>void&nbsp;setParent(<a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a>&nbsp;t)</pre>
<div class="block">Set the parent (closest enclosing tag handler) of this tag handler. Invoked by the JSP page implementation object
prior to doStartTag().
<p>
This value is *not* reset by doEndTag() and must be explicitly reset by a page implementation.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>t</code> - The parent tag, or null.</dd>
</dl>
</li>
</ul>
<a name="getParent--">
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<ul class="blockList">
<li class="blockList">
<h4>getParent</h4>
<pre><a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a>&nbsp;getParent()</pre>
<div class="block">Get the parent (closest enclosing tag handler) for this tag handler.
<p>
The getParent() method can be used to navigate the nested tag handler structure at runtime for cooperation among
custom actions; for example, the findAncestorWithClass() method in TagSupport provides a convenient way of doing
this.
<p>
The current version of the specification only provides one formal way of indicating the observable type of a tag
handler: its tag handler implementation class, described in the tag-class subelement of the tag element. This is
extended in an informal manner by allowing the tag library author to indicate in the description subelement an
observable type. The type should be a subtype of the tag handler implementation class or void. This addititional
constraint can be exploited by a specialized container that knows about that specific tag library, as in the case
of the JSP standard tag library.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the current parent, or null if none.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#findAncestorWithClass-javax.servlet.jsp.tagext.Tag-java.lang.Class-"><code>TagSupport.findAncestorWithClass(javax.servlet.jsp.tagext.Tag, java.lang.Class)</code></a></dd>
</dl>
</li>
</ul>
<a name="doStartTag--">
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<ul class="blockList">
<li class="blockList">
<h4>doStartTag</h4>
<pre>int&nbsp;doStartTag()
throws <a href="../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></pre>
<div class="block">Process the start tag for this instance. This method is invoked by the JSP page implementation object.
<p>
The doStartTag method assumes that the properties pageContext and parent have been set. It also assumes that any
properties exposed as attributes have been set too. When this method is invoked, the body has not yet been
evaluated.
<p>
This method returns Tag.EVAL_BODY_INCLUDE or BodyTag.EVAL_BODY_BUFFERED to indicate that the body of the action
should be evaluated or SKIP_BODY to indicate otherwise.
<p>
When a Tag returns EVAL_BODY_INCLUDE the result of evaluating the body (if any) is included into the current
"out" JspWriter as it happens and then doEndTag() is invoked.
<p>
BodyTag.EVAL_BODY_BUFFERED is only valid if the tag handler implements BodyTag.
<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 doStartTag(), except for a tag handler implementing BodyTag whose
doStartTag() method returns BodyTag.EVAL_BODY_BUFFERED.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>EVAL_BODY_INCLUDE if the tag wants to process body, SKIP_BODY if it does not want to process it.</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>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../javax/servlet/jsp/tagext/BodyTag.html" title="interface in javax.servlet.jsp.tagext"><code>BodyTag</code></a></dd>
</dl>
</li>
</ul>
<a name="doEndTag--">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>doEndTag</h4>
<pre>int&nbsp;doEndTag()
throws <a href="../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></pre>
<div class="block">Process the end tag for this instance. This method is invoked by the JSP page implementation object on all Tag
handlers.
<p>
This method will be called after returning from doStartTag. The body of the action may or may not have been
evaluated, depending on the return value of doStartTag.
<p>
If this method returns EVAL_PAGE, the rest of the page continues to be evaluated. If this method returns
SKIP_PAGE, the rest of the page is not evaluated, the request is completed, and the doEndTag() methods of
enclosing tags are not invoked. If this request was forwarded or included from another page (or Servlet), only
the current page evaluation is stopped.
<p>
The JSP container will resynchronize the values of any AT_BEGIN and AT_END variables (defined by the associated
TagExtraInfo or TLD) after the invocation of doEndTag().</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>indication of whether to continue evaluating the JSP page.</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>
</dl>
</li>
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<a name="release--">
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<h4>release</h4>
<pre>void&nbsp;release()</pre>
<div class="block">Called on a Tag handler to release state. The page compiler guarantees that JSP page implementation objects will
invoke this method on all tag handlers, but there may be multiple invocations on doStartTag and doEndTag in
between.</div>
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