protected static String addProtocolIfMissing(String defaultFs) {
    if (!defaultFs.matches("^[^:]+://.*$")) {
      defaultFs = "webhdfs://" + defaultFs;
    }

    return defaultFs;
  }
takes context and any extra custom properties that needs to be included into config
@param context
@param customProperties
contrib/views/utils/src/main/java/org/apache/ambari/view/utils/hdfs/ConfigurationBuilder.java