src/org/tiefaces/components/websheet/configuration/ExpressionEngine.java
public final Object evaluate(final Map<String, Object> context) {
		JexlContext jexlContext = new MapContext(context);
		try {
			return jExpression.evaluate(jexlContext);
		} catch (Exception e) {
			throw new EvaluationException(
					"An error occurred when evaluating expression "
							+ jExpression.getExpression(), e);
		}
	}
public final Object evaluate(final Map<String, Object> context) {
		JexlContext jexlContext = new MapContext(context);
		try {
			return jExpression.evaluate(jexlContext);
		} catch (Exception e) {
			throw new EvaluationException(
					"An error occurred when evaluating expression "
							+ jExpression.getExpression(), e);
		}
	}
evaluate from giving context.

@param context
context.
@return object evaluated.