{

public static void main(String[] args)

{

// Create a new TinkerGraph and try to load the air-routes graph

TinkerGraph tg = TinkerGraph.open() ;

System.out.println("\nOpening air-routes.graphml");

try

{

tg.io(IoCore.graphml()).readGraph("air-routes.graphml");

}

catch( IOException e )

{

System.out.println("GraphStats - Air routes GraphML file not found");

System.exit(1);

}

GraphTraversalSource g = tg.traversal();

// Run some queries and display a few statistics

System.out.println("Collecting stats");

System.out.println("\nDistribution of vertices and edges");

System.out.println("----------------------------------");

// Display some basic demographics

// Note that label has to be prefixed by "T."

Map verts = g.V().groupCount().by(T.label).next();

Map edges = g.E().groupCount().by(T.label).next();

System.out.println("Vertices : " + verts);

System.out.println("Edges : " + edges);

// Find the airport with the most overall routes.

// Note that we have to use the "__." prefix for some steps and that "decr"

// has to be prefixed by "Order".

Map <String,?> most = g.V().hasLabel("airport").

order().by(__.bothE("route").count(),Order.decr).limit(1).

project("ap","num","city").by("code").by(__.bothE("route").count()).

by("city").next();

String s = "" + most.get("ap") + "/" + most.get("city");

Long r = (Long) most.get("num");

System.out.println("\nThe airport with the most routes is " + s + " with " + r + " routes") ;

// Find the airports with the most routes overall (incoming + outgoing)

System.out.println("\nTop 20 airports by total routes");

System.out.println("===============================");

List<Map<String,Object>> top =

g.V().hasLabel("airport").

order().by(__.both("route").count(),Order.decr).limit(20).

project("ap","num","city").by("code").by(__.both("route").count()).by("city").

toList();

// Either of these can be used

//for(Map a: top) { System.out.format("%4s %12s %4d\n",a.get("ap"),a.get("city"), a.get("num"));}

top.forEach((a) -> System.out.format("%4s %12s %4d\n",a.get("ap"),a.get("city"),a.get("num")));

// Find the airports with the most outgoing routes

System.out.println("\nTop 20 airports by outgoing routes");

System.out.println("==================================");

List<Map<String,Object>> topout =

g.V().hasLabel("airport").

order().by(__.out("route").count(),Order.decr).limit(20).

project("ap","num","city").by("code").by(__.out("route").count()).by("city").

toList();

topout.forEach((a) -> System.out.format("%4s %12s %4d\n",a.get("ap"),a.get("city"),a.get("num")));

// Find the airports with the most incoming routes

System.out.println("\nTop 20 airports by incoming routes");

System.out.println("==================================");

List<Map<String,Object>> topin =

g.V().hasLabel("airport").

order().by(__.in("route").count(),Order.decr).limit(20).

project("ap","num","city").by("code").by(__.in("route").count()).by("city").

toList();

topin.forEach((a) -> System.out.format("%4s %12s %4d\n",a.get("ap"),a.get("city"),a.get("num")));

// Find the longest route in the graph

Map <String,?> longroute =

g.E().hasLabel("route").

order().by("dist",Order.decr).limit(1).

project("from","to","num").

by(__.inV().values("city")).by(__.outV().values("city")).by("dist").next();

System.out.println("\nThe longest route in the graph is " + longroute.get("num") +

" miles between " + longroute.get("from") + " and " + longroute.get("to"));

// Find the longest runway in the graph

Map <String,?> longest =

g.V().hasLabel("airport").order().by("longest",Order.decr).limit(1).

project("ap","num","city").by("code").by("longest").by("city").next();

System.out.println("The longest runway in the graph is " + longest.get("num") + " feet at " +

longest.get("city") + "/" + longest.get("ap"));

// Find the continent with the most airports

Map <String,?> cmost;

cmost = g.V().hasLabel("continent").

order().by(__.out("contains").count(),Order.decr).limit(1).

project("num","cont").

by(__.out("contains").count()).

by("desc").next();

System.out.println("The continent with the most airports: " +

cmost.get("cont") + " (" +

cmost.get("num") +")");

// Find the country with the most airports

cmost = g.V().hasLabel("country").

order().by(__.out("contains").count(),Order.decr).limit(1).

project("num","country").

by(__.out("contains").count()).

by("desc").next();

System.out.println("The country with the most airports: " +

cmost.get("country") + " (" +

cmost.get("num") +")");

}