Method from

corpus/java/training/guava/graph/GraphBuilder.java:79–83

Returns a GraphBuilder initialized with all properties queryable from graph. The "queryable" properties are those that are exposed through the Graph interface, such as Graph#isDirected(). Other properties, such as #expectedNodeCount(int), are not set in th

(Graph<N> graph)

   * are not set in the new builder.
   */
  public static <N> GraphBuilder<N> from(Graph<N> graph) {
    // TODO(b/28087289): add allowsParallelEdges() once we support them
    return new GraphBuilder<N>(graph.isDirected())
        .allowsSelfLoops(graph.allowsSelfLoops());
  }

  /**
   * Specifies whether the graph will allow self-loops (edges that connect a node to itself).