if (contentType==null || contentType.isEmpty()) return false;
return (contentType.startsWith("image/"));
}
public static OrientVertex getNodeVertex(String nodeId) throws DocumentNotFoundException{
GenericDao dao = GenericDao.getInstance();
OrientGraph conn = DbHelper.getOrientGraphConnection();
ORID nodeORID = dao.getRidNodeByUUID(nodeId);
if (nodeORID==null) throw new DocumentNotFoundException(nodeId + " is not a valid Id");
ODocument nodeDoc = dao.get(nodeORID);
if (nodeDoc==null) throw new DocumentNotFoundException(nodeId + " is not a valid Id");
return conn.getVertex(nodeDoc.field(NodeDao.FIELD_LINK_TO_VERTEX));
}