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| <li>Summary: </li> |
| <li>Nested | </li> |
| <li><a href="#field.summary">Field</a> | </li> |
| <li>Constr | </li> |
| <li><a href="#method.summary">Method</a></li> |
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| <li>Detail: </li> |
| <li><a href="#field.detail">Field</a> | </li> |
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| <div class="subTitle">jakarta.servlet.jsp.tagext</div> |
| <h2 title="Interface Tag" class="title">Interface Tag</h2> |
| </div> |
| <div class="contentContainer"> |
| <div class="description"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <dl> |
| <dt>All Superinterfaces:</dt> |
| <dd><a href="../../../../jakarta/servlet/jsp/tagext/JspTag.html" title="interface in jakarta.servlet.jsp.tagext">JspTag</a></dd> |
| </dl> |
| <dl> |
| <dt>All Known Subinterfaces:</dt> |
| <dd><a href="../../../../jakarta/servlet/jsp/tagext/BodyTag.html" title="interface in jakarta.servlet.jsp.tagext">BodyTag</a>, <a href="../../../../jakarta/servlet/jsp/tagext/IterationTag.html" title="interface in jakarta.servlet.jsp.tagext">IterationTag</a>, <a href="../../../../jakarta/servlet/jsp/jstl/core/LoopTag.html" title="interface in jakarta.servlet.jsp.jstl.core">LoopTag</a></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../jakarta/servlet/jsp/tagext/BodyTagSupport.html" title="class in jakarta.servlet.jsp.tagext">BodyTagSupport</a>, <a href="../../../../jakarta/servlet/jsp/jstl/core/ConditionalTagSupport.html" title="class in jakarta.servlet.jsp.jstl.core">ConditionalTagSupport</a>, <a href="../../../../jakarta/servlet/jsp/jstl/core/LoopTagSupport.html" title="class in jakarta.servlet.jsp.jstl.core">LoopTagSupport</a>, <a href="../../../../jakarta/servlet/jsp/tagext/TagAdapter.html" title="class in jakarta.servlet.jsp.tagext">TagAdapter</a>, <a href="../../../../jakarta/servlet/jsp/tagext/TagSupport.html" title="class in jakarta.servlet.jsp.tagext">TagSupport</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public interface <span class="typeNameLabel">Tag</span> |
| extends <a href="../../../../jakarta/servlet/jsp/tagext/JspTag.html" title="interface in jakarta.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 |
| <body-content> 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"> </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="../../../../jakarta/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="../../../../jakarta/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="../../../../jakarta/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="../../../../jakarta/servlet/jsp/tagext/Tag.html#SKIP_PAGE">SKIP_PAGE</a></span></code> |
| <div class="block">Skip the rest of the page.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.summary"> |
| <!-- --> |
| </a> |
| <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"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </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="../../../../jakarta/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="../../../../jakarta/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="../../../../jakarta/servlet/jsp/tagext/Tag.html" title="interface in jakarta.servlet.jsp.tagext">Tag</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/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="../../../../jakarta/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="../../../../jakarta/servlet/jsp/tagext/Tag.html#setPageContext-jakarta.servlet.jsp.PageContext-">setPageContext</a></span>(<a href="../../../../jakarta/servlet/jsp/PageContext.html" title="class in jakarta.servlet.jsp">PageContext</a> 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="../../../../jakarta/servlet/jsp/tagext/Tag.html#setParent-jakarta.servlet.jsp.tagext.Tag-">setParent</a></span>(<a href="../../../../jakarta/servlet/jsp/tagext/Tag.html" title="interface in jakarta.servlet.jsp.tagext">Tag</a> t)</code> |
| <div class="block">Set the parent (closest enclosing tag handler) of this tag handler.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="field.detail"> |
| <!-- --> |
| </a> |
| <h3>Field Detail</h3> |
| <a name="SKIP_BODY"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>SKIP_BODY</h4> |
| <pre>static final 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#jakarta.servlet.jsp.tagext.Tag.SKIP_BODY">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="EVAL_BODY_INCLUDE"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>EVAL_BODY_INCLUDE</h4> |
| <pre>static final 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#jakarta.servlet.jsp.tagext.Tag.EVAL_BODY_INCLUDE">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="SKIP_PAGE"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>SKIP_PAGE</h4> |
| <pre>static final 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#jakarta.servlet.jsp.tagext.Tag.SKIP_PAGE">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="EVAL_PAGE"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>EVAL_PAGE</h4> |
| <pre>static final 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#jakarta.servlet.jsp.tagext.Tag.EVAL_PAGE">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="setPageContext-jakarta.servlet.jsp.PageContext-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setPageContext</h4> |
| <pre>void setPageContext(<a href="../../../../jakarta/servlet/jsp/PageContext.html" title="class in jakarta.servlet.jsp">PageContext</a> 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-jakarta.servlet.jsp.tagext.Tag-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setParent</h4> |
| <pre>void setParent(<a href="../../../../jakarta/servlet/jsp/tagext/Tag.html" title="interface in jakarta.servlet.jsp.tagext">Tag</a> 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--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getParent</h4> |
| <pre><a href="../../../../jakarta/servlet/jsp/tagext/Tag.html" title="interface in jakarta.servlet.jsp.tagext">Tag</a> 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="../../../../jakarta/servlet/jsp/tagext/TagSupport.html#findAncestorWithClass-jakarta.servlet.jsp.tagext.Tag-java.lang.Class-"><code>TagSupport.findAncestorWithClass(jakarta.servlet.jsp.tagext.Tag, java.lang.Class<?>)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="doStartTag--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>doStartTag</h4> |
| <pre>int doStartTag() |
| throws <a href="../../../../jakarta/servlet/jsp/JspException.html" title="class in jakarta.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="../../../../jakarta/servlet/jsp/JspException.html" title="class in jakarta.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="../../../../jakarta/servlet/jsp/tagext/BodyTag.html" title="interface in jakarta.servlet.jsp.tagext"><code>BodyTag</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="doEndTag--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>doEndTag</h4> |
| <pre>int doEndTag() |
| throws <a href="../../../../jakarta/servlet/jsp/JspException.html" title="class in jakarta.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> |
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| <div class="block">Called on a Tag handler to release state. The page compiler guarantees that JSP page implementation objects will |
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