Apache jena to update remote endpoint - insert

Question

The current procedure we now often perform is to extract data from an endpoint, perform computational analysis, generate RDF files and manually load them back into the endpoint.
Now I was looking into automating this procedure using Apache Jena ARQ as these dependencies are currently used for the retrieval of information.
I manage to get it partially to work using INSERT statements but performing thousands if not millions of inserts one by one seem a bit inefficient to me. The second issue is that we sometimes have regex or " in a string and this needs to escaped but there are many exceptions.
Is there a way to either parse or iterate over an internal apache jena model statements and inject this directly into an endpoint?
We currently use graphdb but it would be great if this can be applied using a universal approach.
Update
I have updated the code to handle 10 statements at once not sure yet what eventually the limit will be...
public class EndpointTests extends TestCase {
// Only for local testing
public void testEndpoint() throws Throwable {
String endpoint = "http://10.117.11.77:7200/repositories/Test";
Domain domain = new Domain("file:///Users/jasperkoehorst/diana_interproscan_head.nt");
StmtIterator statements = domain.getRDFSimpleCon().getModel().listStatements();
String strInsert = "INSERT DATA { ";
int insertCounter = 0;
while (statements.hasNext()) {
insertCounter = insertCounter + 1;
Statement statement = statements.nextStatement();
String subject = statement.getSubject().getURI();
String predicate = statement.getPredicate().getURI();
String object = statement.getObject().toString();
if (statement.getObject().isURIResource()) {
object = "<" + statement.getObject().toString() + ">";
}
if (statement.getObject().isLiteral()) {
object = statement.getObject().asLiteral().getString();
object = object.replaceAll("\\\\", "\\\\\\\\");
object = object.replaceAll("\"","\\\\\"");
}
if (object.startsWith("http")) {
object = "<" + object + ">";
} else {
object = "\"" + object + "\"";
}
strInsert = strInsert + "<" + subject + "> <" + predicate + "> " + object + " . ";
if (insertCounter % 10 == 0) {
System.out.println(insertCounter);
strInsert = strInsert + " } ";
UpdateRequest updateRequest = UpdateFactory.create(strInsert);
UpdateProcessor updateProcessor = UpdateExecutionFactory.createRemote(updateRequest, endpoint + "/statements");
updateProcessor.execute();
strInsert = "INSERT DATA { ";
}
}
}
}