public String toString() {
        final String fromString = this.configuration.containsKey(Constants.GREMLIN_HADOOP_GRAPH_READER) ?
                this.configuration.getGraphReader().getSimpleName() :
                "no-reader";
        final String toString = this.configuration.containsKey(Constants.GREMLIN_HADOOP_GRAPH_WRITER) ?
                this.configuration.getGraphWriter().getSimpleName() :
                "no-writer";
        return StringFactory.graphString(this, fromString.toLowerCase() + "->" + toString.toLowerCase());
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/HadoopGraph.java