@Override
    public List<String> ls(final String pattern) {
        return Stream.of(this.listStatuses(pattern)).map(FileSystemStorage::fileStatusString).collect(Collectors.toList());
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/io/FileSystemStorage.java