The DatasetGraphNoSql.load(importFileName, Lang.TURTLE , conn, baseURI) will load the triples into the default graph when dealing with files that are handling multiple named graphs. The last parameter in this operation refers to the base URI to use when converting relative to absolute URIs.
If you want to load an RDF file directly into a specified named graph you can create a Model instance for this named graph and read the data using the model.read(InputStream, lang) API as in the following code snippet:
String graphName = "http://www.w3.org/wine#"
String lang = "TURTLE";
OracleModelNoSql model = OracleModelNoSql.createOracleModelNoSql(graphName, conn);
// You can also specify the DOP and Batch Size to use parallel load for this model
Inputstream in = new FileInputStream(new File(importFileName));
Many thanks! This is exactly what I was looking for