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 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
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package javax.servlet.jsp.el;


/**
 * 

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.

* * @deprecated As of JSP 2.1, replaced by {@link javax.el.ValueExpression} * @since JSP 2.0 */ public abstract class Expression { /** * 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. * * @param vResolver A VariableResolver instance that can be used at * runtime to resolve the name of implicit objects into Objects. * @return The result of the expression evaluation. * * @exception ELException Thrown if the expression evaluation failed. */ public abstract Object evaluate( VariableResolver vResolver ) throws ELException; }




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