Java EE 5 SDK

Class Expression

  extended by javax.servlet.jsp.el.Expression

Deprecated. As of JSP 2.1, replaced by ValueExpression

public abstract class Expression
extends Object

The abstract class for a prepared expression.

An instance of an Expression can be obtained via from an ExpressionEvaluator instance.

An Expression may or not have done a syntactic parse of the expression. A client invoking the evaluate() method should be ready for the case where ELParseException exceptions are raised.

JSP 2.0

Constructor Summary
Method Summary
abstract  Object evaluate(VariableResolver vResolver)
          Deprecated. Evaluates an expression that was previously prepared.
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public Expression()
Method Detail


public abstract Object evaluate(VariableResolver vResolver)
                         throws ELException
Evaluates an expression that was previously prepared. In some implementations preparing an expression involves full syntactic validation, but others may not do so. Evaluating the expression may raise an ELParseException as well as other ELExceptions due to run-time evaluation.

vResolver - A VariableResolver instance that can be used at runtime to resolve the name of implicit objects into Objects.
The result of the expression evaluation.
ELException - Thrown if the expression evaluation failed.

Java EE 5 SDK

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