} else if (style.equals(QueryStyle.HISTORY_TRAVERSAL)) {
throw new IllegalArgumentException("History Traversal needs history traversal source");
} else if (style.equals(QueryStyle.HISTORY_GREMLIN_TRAVERSAL)) {
} else if (style.equals(QueryStyle.HISTORY_TRAVERSAL)) {
throw new IllegalArgumentException("History Traversal needs history traversal source");
} else if (style.equals(QueryStyle.HISTORY_GREMLIN_TRAVERSAL)) {