/** @since Available in iOS 7.0 and later. */
 public String getRestoreIdentifier() {
   if (has(Keys.RestoreIdentifier())) {
     NSString val = (NSString) get(Keys.RestoreIdentifier());
     return val.toString();
   }
   return null;
 }
 /** @since Available in iOS 7.0 and later. */
 public CBCentralManagerOptions setRestoreIdentifier(String restoreIdentifier) {
   set(Keys.RestoreIdentifier(), new NSString(restoreIdentifier));
   return this;
 }