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| <h2 title="Interface TryCatchFinally" class="title">Interface TryCatchFinally</h2> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../org/apache/taglibs/standard/tag/common/core/CatchTag.html" title="class in org.apache.taglibs.standard.tag.common.core">CatchTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/common/core/ForEachSupport.html" title="class in org.apache.taglibs.standard.tag.common.core">ForEachSupport</a>, <a href="../../../../org/apache/taglibs/standard/tag/common/xml/ForEachTag.html" title="class in org.apache.taglibs.standard.tag.common.xml">ForEachTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/rt/core/ForEachTag.html" title="class in org.apache.taglibs.standard.tag.rt.core">ForEachTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/el/core/ForEachTag.html" title="class in org.apache.taglibs.standard.tag.el.core">ForEachTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/common/core/ForTokensSupport.html" title="class in org.apache.taglibs.standard.tag.common.core">ForTokensSupport</a>, <a href="../../../../org/apache/taglibs/standard/tag/rt/core/ForTokensTag.html" title="class in org.apache.taglibs.standard.tag.rt.core">ForTokensTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/el/core/ForTokensTag.html" title="class in org.apache.taglibs.standard.tag.el.core">ForTokensTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/common/core/ImportSupport.html" title="class in org.apache.taglibs.standard.tag.common.core">ImportSupport</a>, <a href="../../../../org/apache/taglibs/standard/tag/rt/core/ImportTag.html" title="class in org.apache.taglibs.standard.tag.rt.core">ImportTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/el/core/ImportTag.html" title="class in org.apache.taglibs.standard.tag.el.core">ImportTag</a>, <a href="../../../../javax/servlet/jsp/jstl/core/LoopTagSupport.html" title="class in javax.servlet.jsp.jstl.core">LoopTagSupport</a>, <a href="../../../../org/apache/taglibs/standard/tag/rt/sql/QueryTag.html" title="class in org.apache.taglibs.standard.tag.rt.sql">QueryTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/el/sql/QueryTag.html" title="class in org.apache.taglibs.standard.tag.el.sql">QueryTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/common/sql/QueryTagSupport.html" title="class in org.apache.taglibs.standard.tag.common.sql">QueryTagSupport</a>, <a href="../../../../org/apache/taglibs/standard/tag/rt/sql/TransactionTag.html" title="class in org.apache.taglibs.standard.tag.rt.sql">TransactionTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/el/sql/TransactionTag.html" title="class in org.apache.taglibs.standard.tag.el.sql">TransactionTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/common/sql/TransactionTagSupport.html" title="class in org.apache.taglibs.standard.tag.common.sql">TransactionTagSupport</a>, <a href="../../../../org/apache/taglibs/standard/tag/rt/sql/UpdateTag.html" title="class in org.apache.taglibs.standard.tag.rt.sql">UpdateTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/el/sql/UpdateTag.html" title="class in org.apache.taglibs.standard.tag.el.sql">UpdateTag</a>, <a href="../../../../org/apache/taglibs/standard/tag/common/sql/UpdateTagSupport.html" title="class in org.apache.taglibs.standard.tag.common.sql">UpdateTagSupport</a></dd> |
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| <br> |
| <pre>public interface <span class="typeNameLabel">TryCatchFinally</span></pre> |
| <div class="block">The auxiliary interface of a Tag, IterationTag or BodyTag tag handler that wants additional hooks for managing |
| resources. |
| |
| <p> |
| This interface provides two new methods: doCatch(Throwable) and doFinally(). The prototypical invocation is as |
| follows: |
| |
| <pre> |
| h = get a Tag(); // get a tag handler, perhaps from pool |
| |
| h.setPageContext(pc); // initialize as desired |
| h.setParent(null); |
| h.setFoo("foo"); |
| |
| // tag invocation protocol; see Tag.java |
| try { |
| doStartTag()... |
| .... |
| doEndTag()... |
| } catch (Throwable t) { |
| // react to exceptional condition |
| h.doCatch(t); |
| } finally { |
| // restore data invariants and release per-invocation resources |
| h.doFinally(); |
| } |
| |
| ... other invocations perhaps with some new setters |
| ... |
| h.release(); // release long-term resources |
| </pre></div> |
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| <h3>Method Summary</h3> |
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| <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> |
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| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/TryCatchFinally.html#doCatch-java.lang.Throwable-">doCatch</a></span>(java.lang.Throwable t)</code> |
| <div class="block">Invoked if a Throwable occurs while evaluating the BODY inside a tag or in any of the following methods: |
| Tag.doStartTag(), Tag.doEndTag(), IterationTag.doAfterBody() and BodyTag.doInitBody().</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/TryCatchFinally.html#doFinally--">doFinally</a></span>()</code> |
| <div class="block">Invoked in all cases after doEndTag() for any class implementing Tag, IterationTag or BodyTag.</div> |
| </td> |
| </tr> |
| </table> |
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| </ul> |
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| <h4>doCatch</h4> |
| <pre>void doCatch(java.lang.Throwable t) |
| throws java.lang.Throwable</pre> |
| <div class="block">Invoked if a Throwable occurs while evaluating the BODY inside a tag or in any of the following methods: |
| Tag.doStartTag(), Tag.doEndTag(), IterationTag.doAfterBody() and BodyTag.doInitBody(). |
| |
| <p> |
| This method is not invoked if the Throwable occurs during one of the setter methods. |
| |
| <p> |
| This method may throw an exception (the same or a new one) that will be propagated further up the nest chain. If |
| an exception is thrown, doFinally() will be invoked. |
| |
| <p> |
| This method is intended to be used to respond to an exceptional condition.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>t</code> - The throwable exception navigating through this tag.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.Throwable</code> - if the exception is to be rethrown further up the nest chain.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="doFinally--"> |
| <!-- --> |
| </a> |
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| <h4>doFinally</h4> |
| <pre>void doFinally()</pre> |
| <div class="block">Invoked in all cases after doEndTag() for any class implementing Tag, IterationTag or BodyTag. This method is |
| invoked even if an exception has occurred in the BODY of the tag, or in any of the following methods: |
| Tag.doStartTag(), Tag.doEndTag(), IterationTag.doAfterBody() and BodyTag.doInitBody(). |
| |
| <p> |
| This method is not invoked if the Throwable occurs during one of the setter methods. |
| |
| <p> |
| This method should not throw an Exception. |
| |
| <p> |
| This method is intended to maintain per-invocation data integrity and resource management actions.</div> |
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