code: private Set<String> getKeysForUser(CmsUser user) {
  
          Set<String> keysToRemove = new HashSet<String>();
          for (Map.Entry<String, CmsUserData> entry : m_storage.entrySet()) {
              String key = entry.getKey();
              int separatorPos = key.lastIndexOf(KEY_SEPARATOR);
              String prefix = key.substring(0, separatorPos);
              if (user.getName().equals(prefix)) {
                  keysToRemove.add(key);
              }
          }
          return keysToRemove;
      }
docs: Helper method to get all the storage keys that match a user's name.<p>
  
  @param user the user for which to get the storage keys
  
  @return the set of storage keys