public static String edgeString(final Edge edge) {
        return E + L_BRACKET + edge.id() + R_BRACKET + L_BRACKET + edge.outVertex().id() + DASH + edge.label() + ARROW + edge.inVertex().id() + R_BRACKET;
    }
Construct the representation for a {@link Edge}.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/util/StringFactory.java