@Override
public Object getReducedValue(
final Object ctx, final Object thisValue, final VariableResolverFactory factory) {
try {
return !((Boolean) MVEL.eval(expr, start, offset, ctx, factory));
} catch (final NullPointerException e) {
throw new CompileException("negation operator applied to a null value", expr, start, e);
} catch (final ClassCastException e) {
throw new CompileException(
"negation operator applied to non-boolean expression", expr, start, e);
}
}