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| <div class="subTitle">jakarta.servlet.jsp.el</div> |
| <h2 title="Class ExpressionEvaluator" class="title">Class ExpressionEvaluator</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>jakarta.servlet.jsp.el.ExpressionEvaluator</li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
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| <hr> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="block"><span class="deprecationComment">As of JSP 2.1, replaced by <code>jakarta.el.ExpressionFactory</code></span></div> |
| </div> |
| <br> |
| <pre>@Deprecated |
| public abstract class <span class="typeNameLabel">ExpressionEvaluator</span> |
| extends java.lang.Object</pre> |
| <div class="block"><p> |
| The abstract base class for an expression-language evaluator. Classes that implement an expression language expose |
| their functionality via this abstract class. |
| </p> |
| |
| <p> |
| An instance of the ExpressionEvaluator can be obtained via the JspContext / PageContext |
| </p> |
| |
| <p> |
| The parseExpression() 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. |
| </p> |
| |
| <p> |
| Only a single EL expression, starting with '${' and ending with '}', can be parsed or evaluated at a time. EL |
| expressions cannot be mixed with static text. For example, attempting to parse or evaluate |
| "<code>abc${1+1}def${1+1}ghi</code>" or even "<code>${1+1}${1+1}</code>" will cause an <code>ELException</code> to be |
| thrown. |
| </p> |
| |
| <p> |
| The following are examples of syntactically legal EL expressions: |
| </p> |
| |
| <ul> |
| <li><code>${person.lastName}</code></li> |
| <li><code>${8 * 8}</code></li> |
| <li><code>${my:reverse('hello')}</code></li> |
| </ul></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>JSP 2.0</dd> |
| </dl> |
| </li> |
| </ul> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../jakarta/servlet/jsp/el/ExpressionEvaluator.html#ExpressionEvaluator--">ExpressionEvaluator</a></span>()</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
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| <td class="colFirst"><code>abstract java.lang.Object</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/servlet/jsp/el/ExpressionEvaluator.html#evaluate-java.lang.String-java.lang.Class-jakarta.servlet.jsp.el.VariableResolver-jakarta.servlet.jsp.el.FunctionMapper-">evaluate</a></span>(java.lang.String expression, |
| java.lang.Class<?> expectedType, |
| <a href="../../../../jakarta/servlet/jsp/el/VariableResolver.html" title="interface in jakarta.servlet.jsp.el">VariableResolver</a> vResolver, |
| <a href="../../../../jakarta/servlet/jsp/el/FunctionMapper.html" title="interface in jakarta.servlet.jsp.el">FunctionMapper</a> fMapper)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Evaluates an expression.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../jakarta/servlet/jsp/el/Expression.html" title="class in jakarta.servlet.jsp.el">Expression</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/servlet/jsp/el/ExpressionEvaluator.html#parseExpression-java.lang.String-java.lang.Class-jakarta.servlet.jsp.el.FunctionMapper-">parseExpression</a></span>(java.lang.String expression, |
| java.lang.Class<?> expectedType, |
| <a href="../../../../jakarta/servlet/jsp/el/FunctionMapper.html" title="interface in jakarta.servlet.jsp.el">FunctionMapper</a> fMapper)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Prepare an expression for later evaluation.</div> |
| </td> |
| </tr> |
| </table> |
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| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
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| <h4>ExpressionEvaluator</h4> |
| <pre>public ExpressionEvaluator()</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </li> |
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| <h4>parseExpression</h4> |
| <pre>public abstract <a href="../../../../jakarta/servlet/jsp/el/Expression.html" title="class in jakarta.servlet.jsp.el">Expression</a> parseExpression(java.lang.String expression, |
| java.lang.Class<?> expectedType, |
| <a href="../../../../jakarta/servlet/jsp/el/FunctionMapper.html" title="interface in jakarta.servlet.jsp.el">FunctionMapper</a> fMapper) |
| throws <a href="../../../../jakarta/servlet/jsp/el/ELException.html" title="class in jakarta.servlet.jsp.el">ELException</a></pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Prepare an expression for later evaluation. This method should perform syntactic validation of the expression; if |
| in doing so it detects errors, it should raise an ELParseException.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>expression</code> - The expression to be evaluated.</dd> |
| <dd><code>expectedType</code> - The expected type of the result of the evaluation</dd> |
| <dd><code>fMapper</code> - A FunctionMapper to resolve functions found in the expression. It can be null, in which case |
| no functions are supported for this invocation. The ExpressionEvaluator must not hold on to |
| the FunctionMapper reference after returning from <code>parseExpression()</code>. The |
| <code>Expression</code> object returned must invoke the same functions regardless of whether |
| the mappings in the provided <code>FunctionMapper</code> instance change between calling |
| <code>ExpressionEvaluator.parseExpression()</code> and <code>Expression.evaluate()</code>.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The Expression object encapsulating the arguments.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../jakarta/servlet/jsp/el/ELException.html" title="class in jakarta.servlet.jsp.el">ELException</a></code> - Thrown if parsing errors were found.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="evaluate-java.lang.String-java.lang.Class-jakarta.servlet.jsp.el.VariableResolver-jakarta.servlet.jsp.el.FunctionMapper-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>evaluate</h4> |
| <pre>public abstract java.lang.Object evaluate(java.lang.String expression, |
| java.lang.Class<?> expectedType, |
| <a href="../../../../jakarta/servlet/jsp/el/VariableResolver.html" title="interface in jakarta.servlet.jsp.el">VariableResolver</a> vResolver, |
| <a href="../../../../jakarta/servlet/jsp/el/FunctionMapper.html" title="interface in jakarta.servlet.jsp.el">FunctionMapper</a> fMapper) |
| throws <a href="../../../../jakarta/servlet/jsp/el/ELException.html" title="class in jakarta.servlet.jsp.el">ELException</a></pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Evaluates an expression. This method may perform some syntactic validation and, if so, it should raise an |
| ELParseException error if it encounters syntactic errors. EL evaluation errors should cause an ELException to be |
| raised.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>expression</code> - The expression to be evaluated.</dd> |
| <dd><code>expectedType</code> - The expected type of the result of the evaluation</dd> |
| <dd><code>vResolver</code> - A VariableResolver instance that can be used at runtime to resolve the name of implicit |
| objects into Objects.</dd> |
| <dd><code>fMapper</code> - A FunctionMapper to resolve functions found in the expression. It can be null, in which case |
| no functions are supported for this invocation.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The result of the expression evaluation.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../jakarta/servlet/jsp/el/ELException.html" title="class in jakarta.servlet.jsp.el">ELException</a></code> - Thrown if the expression evaluation failed.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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