[orientdb] How to get the type of class from a vertex?

[Academia Learning Centro de inglés y de formación]

Hello, I want to empty the db and I was testing this way (I do not know if 
it's the right one)

Iterable<Vertex> resultIteratorVertices = graph.getVertices(true);
for (Vertex v : resultIteratorVertices){
   graph.command( new OCommandSQL("TRUNCATE CLASS "+ *v.getClass* + " 
POLYMORPHIC UNSAFE") ).execute();
}

To remove all records from all classes, but I can not figure out how to get 
the type of class from each record

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