/** * Requests the {@link #classScanner} to add a class or all classes from a package. A {@code null} * argument indicates the unnamed package. */ public Builder classesOrPackages(String... classesOrPackages) throws IOException { if (classesOrPackages == null) { classScanner.addPackage(null, true); } else for (String s : classesOrPackages) { classScanner.addClassOrPackage(s); } return this; }