@Override
    public VertexWritable getCurrentValue() {
        return this.vertexWritable;
    }
@author Daniel Kuppitz (http://gremlin.guru)
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/io/script/ScriptRecordReader.java