javax.servlet.jsp.el
Class Expression
java.lang.Objectjavax.servlet.jsp.el.Expression
public abstract class Expression
extends java.lang.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.
evaluate
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.
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