public void setContext(final Mapper<NullWritable, VertexWritable, ObjectWritable, ObjectWritable>.Context context) {
            this.context = context;
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/process/computer/HadoopMap.java