/**
* Evaluates and returns the value of the expression as an object. The EvaluatorVisitor member ev
* is used to do the evaluation procedure. This method is useful when the type of the value is
* unknown, or not important.
*
* @return The calculated value of the expression if no errors occur. Returns null otherwise.
*/
public Object getValueAsObject() {
Object result;
if (topNode == null) return null;
// evaluate the expression
try {
result = ev.getValue(topNode, symTab);
} catch (ParseException e) {
if (debug) System.out.println(e);
errorList.addElement("Error during evaluation: " + e.getMessage());
return null;
} catch (RuntimeException e) {
if (debug) System.out.println(e);
errorList.addElement(e.getClass().getName() + ": " + e.getMessage());
return null;
}
return result;
}
/**
* Evaluate an expression. This method evaluates the argument rather than the topNode of the JEP
* instance. It should be used in conjunction with {@link #parse parse} rather than {@link
* #parseExpression parseExpression}.
*
* @param node the top node of the tree representing the expression.
* @return The value of the expression
* @throws ParseException if for some reason the expression could not be evaluated
* @throws RuntimeException could potentially be thrown.
* @since 2.3.0 alpha
*/
public Object evaluate(Node node) throws ParseException {
return ev.getValue(node, this.symTab);
}
