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using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace examples
{
public static class RouteGuideUtil
{
public const string DefaultFeaturesFile = "route_guide_db.json";
private const double CoordFactor = 1e7;
/// <summary>
/// Indicates whether the given feature exists (i.e. has a valid name).
/// </summary>
public static bool Exists(Feature feature)
{
return feature != null && (feature.Name.Length != 0);
}
public static double GetLatitude(Point point)
{
return point.Latitude / CoordFactor;
}
public static double GetLongitude(Point point)
{
return point.Longitude / CoordFactor;
}
/// <summary>
/// Parses features from a JSON file.
/// </summary>
public static List<Feature> ParseFeatures(string filename)
{
var features = new List<Feature>();
var jsonFeatures = JsonConvert.DeserializeObject<List<JsonFeature>>(File.ReadAllText(filename));
foreach(var jsonFeature in jsonFeatures)
{
features.Add(Feature.CreateBuilder().SetName(jsonFeature.name).SetLocation(
Point.CreateBuilder()
.SetLongitude(jsonFeature.location.longitude)
.SetLatitude(jsonFeature.location.latitude).Build()).Build());
}
return features;
}
private class JsonFeature
{
public string name;
public JsonLocation location;
}
private class JsonLocation
{
public int longitude;
public int latitude;
}
}
}
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