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| <h2 title="Interface ExpressionEvaluator" class="title">Interface ExpressionEvaluator</h2> |
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| <pre>public interface <span class="typeNameLabel">ExpressionEvaluator</span></pre> |
| <div class="block"><p>The interface for an expression-language validator and evaluator. |
| Classes that implement an expression language expose their functionality |
| via this interface.</p> |
| |
| <p>The validate() and evaluate() methods must be thread-safe. That is, |
| multiple threads may call these methods on the same ExpressionEvaluator |
| object simultaneously. Implementations should synchronize access if |
| they depend on transient state. Implementations should not, however, |
| assume that only one object of each ExpressionEvaluator type will be |
| instantiated; global caching should therefore be static. No release() |
| mechanism or robust lifecycle is specified, for language-interpreter |
| pluggability is experimental in EA2.</p> |
| |
| <p><b>WARNING</b>: This class supports experimentation for the EA2 |
| release of JSTL; it is not expected to be part of the final RI or |
| specification.</p></div> |
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| <td class="colFirst"><code>java.lang.Object</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/taglibs/standard/lang/support/ExpressionEvaluator.html#evaluate-java.lang.String-java.lang.String-java.lang.Class-javax.servlet.jsp.tagext.Tag-javax.servlet.jsp.PageContext-">evaluate</a></span>(java.lang.String attributeName, |
| java.lang.String expression, |
| java.lang.Class expectedType, |
| <a href="../../../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a> tag, |
| <a href="../../../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</a> pageContext)</code> |
| <div class="block">Evaluates the expression at request time.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/taglibs/standard/lang/support/ExpressionEvaluator.html#validate-java.lang.String-java.lang.String-">validate</a></span>(java.lang.String attributeName, |
| java.lang.String expression)</code> |
| <div class="block">Translation time validation of an expression.</div> |
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| <h4>validate</h4> |
| <pre>java.lang.String validate(java.lang.String attributeName, |
| java.lang.String expression)</pre> |
| <div class="block">Translation time validation of an expression. |
| This method will return a null String if the expression |
| is valid; otherwise an error message.</div> |
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| <h4>evaluate</h4> |
| <pre>java.lang.Object evaluate(java.lang.String attributeName, |
| java.lang.String expression, |
| java.lang.Class expectedType, |
| <a href="../../../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a> tag, |
| <a href="../../../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</a> pageContext) |
| throws <a href="../../../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></pre> |
| <div class="block">Evaluates the expression at request time.</div> |
| <dl> |
| <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></dd> |
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