org.jbpm.jpdl.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.

The abstract base class for an expression-language evaluator. Classes that implement an expression language expose their functionality via this abstract class.

An instance of the ExpressionEvaluator can be obtained via the JspContext / PageContext

The parseExpression() and evaluate() methods must be thread-safe.

The interface to a map between EL function names and methods.

Classes implementing this interface may, for instance, consult tag library information to resolve the map.

This class is used to customize the way an ExpressionEvaluator resolves variable references at evaluation time.