javax.servlet.jsp.el
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.
Since: 2.0
Method Summary | |
---|---|
abstract Object | evaluate(VariableResolver vResolver)
Evaluates an expression that was previously prepared. |
Parameters: vResolver A VariableResolver instance that can be used at runtime to resolve the name of implicit objects into Objects.
Returns: The result of the expression evaluation.
Throws: ELException Thrown if the expression evaluation failed.