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Deserializing coordinates of all geometry types
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@arnaudleclerc
arnaudleclerc committed Apr 9, 2021
1 parent 40bbc77 commit 898efa2
Showing 1 changed file with 87 additions and 57 deletions.
144 changes: 87 additions & 57 deletions src/AzureMapsControl.Components/Atlas/Geometry.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,6 @@
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;

Expand Down Expand Up @@ -49,7 +48,6 @@ public override Geometry Read(ref Utf8JsonReader reader, Type typeToConvert, Jso
{
reader.Read();
type = reader.GetString();
Console.WriteLine(type);
}

if (reader.TokenType == JsonTokenType.PropertyName && reader.GetString() == "coordinates")
Expand All @@ -72,78 +70,98 @@ public override Geometry Read(ref Utf8JsonReader reader, Type typeToConvert, Jso

public override void Write(Utf8JsonWriter writer, Geometry value, JsonSerializerOptions options) => throw new NotImplementedException();

internal dynamic ReadCoordinates(ref Utf8JsonReader reader)
internal static dynamic ReadCoordinates(ref Utf8JsonReader reader)
{
var startDepth = reader.CurrentDepth;
Console.WriteLine($"1 - Reading coordinates at depth {startDepth}");
dynamic result = null;
do
dynamic coordinates = null;
dynamic positions = null;

while (reader.TokenType != JsonTokenType.EndArray || startDepth != reader.CurrentDepth)
{
Console.WriteLine($"2 - Reading depth {reader.CurrentDepth}");
reader.Read();
Console.WriteLine(reader.TokenType);
Console.WriteLine(reader.CurrentDepth);

if (reader.TokenType == JsonTokenType.StartArray)
if (reader.TokenType == JsonTokenType.Number)
{
result = ReadCoordinatesArray(ref reader, startDepth);
}
}
while (reader.TokenType != JsonTokenType.EndArray && startDepth != reader.CurrentDepth);
return result;
}
// The depth tells us which kind of object we are dealing with
// startDepth => Point
// startDepth + 1 => LineString / MultiPoint
// startDepth + 2 => MultiLineString / Polygon
// startDepth + 3 => Polygon

private dynamic ReadCoordinatesArray(ref Utf8JsonReader reader, int startDepth)
{
dynamic result = null;
Console.WriteLine($"3 - Found array at depth {reader.CurrentDepth}");
reader.Read();
Console.WriteLine(reader.TokenType);
Console.WriteLine(reader.CurrentDepth);
if (reader.CurrentDepth == startDepth + 1)
{
result = ReadPosition(ref reader);
}
else if (reader.CurrentDepth == startDepth + 2)
{
if (result == null)
{
result = new List<Position>();
}

if (reader.TokenType == JsonTokenType.StartArray)
{
result = ReadCoordinatesArray(ref reader, startDepth);
}
else if (reader.TokenType == JsonTokenType.Number)
{
Console.WriteLine($"4 - Found number at depth {reader.CurrentDepth}");
if (reader.CurrentDepth == startDepth + 1)
{
Console.WriteLine("Point case");
result = ReadPosition(ref reader);
}
else if (reader.CurrentDepth == startDepth + 2)
{
Console.WriteLine("LineString and multipoint case");
result = new List<Position>();
result.Add(ReadPosition(ref reader));
}
else if (reader.CurrentDepth == startDepth + 3)
{
if (result == null)
{
result = new List<IEnumerable<Position>>();
}

do
if (coordinates == null)
{
coordinates = new List<Position>();
}

coordinates.Add(ReadPosition(ref reader));
}
else if (reader.CurrentDepth == startDepth + 4)
{
Console.WriteLine("Adding position to line string or multi point");
if (result == null)
{
result = new List<IEnumerable<IEnumerable<Position>>>();
}

if (reader.TokenType == JsonTokenType.StartArray)
if (coordinates == null)
{
Console.WriteLine("5");
reader.Read();
Console.WriteLine(reader.TokenType);
Console.WriteLine(reader.CurrentDepth);
coordinates = new List<IEnumerable<Position>>();
}

result.Add(ReadPosition(ref reader));
if (positions == null)
{
positions = new List<Position>();
}

Console.WriteLine("6");
reader.Read();
Console.WriteLine(reader.TokenType);
Console.WriteLine(reader.CurrentDepth);
} while (reader.TokenType == JsonTokenType.StartArray && reader.CurrentDepth == startDepth + 1);
positions.Add(ReadPosition(ref reader));
}
}

if (reader.TokenType == JsonTokenType.EndArray)
{
if (reader.CurrentDepth == startDepth + 2)
{
if (positions != null)
{
coordinates.Add(positions);
positions = null;
}
}
else if (reader.CurrentDepth == startDepth + 1)
{
if (coordinates != null)
{
result.Add(coordinates);
coordinates = null;
}
}
}
}

return result;
}

private Position ReadPosition(ref Utf8JsonReader reader)
internal static Position ReadPosition(ref Utf8JsonReader reader)
{
var result = new Position();
result.Longitude = reader.GetDouble();
Expand All @@ -159,7 +177,7 @@ private Position ReadPosition(ref Utf8JsonReader reader)
}
}

internal class GeometryJsonConverter<TGeometry> : JsonConverter<TGeometry> where TGeometry : Geometry, new()
internal class GeometryJsonConverter<TGeometry> : JsonConverter<TGeometry> where TGeometry : Geometry
{
public GeometryJsonConverter() { }

Expand All @@ -168,22 +186,34 @@ public override TGeometry Read(ref Utf8JsonReader reader, Type typeToConvert, Js
var originalDepth = reader.CurrentDepth;

string type = null;
dynamic coordinates = null;

while (reader.TokenType != JsonTokenType.EndObject || originalDepth != reader.CurrentDepth)
{
reader.Read();

if (reader.TokenType == JsonTokenType.PropertyName && reader.GetString() == "type")
{
reader.Read();
type = reader.GetString();
Console.WriteLine(type);
}

if (reader.TokenType == JsonTokenType.PropertyName && reader.GetString() == "coordinates")
{
coordinates = GeometryJsonConverter.ReadCoordinates(ref reader);
}

}

var geometry = new TGeometry {
GeometryType = type
return type switch {
Point.InnerGeometryType => new Point(coordinates) as TGeometry,
LineString.InnerGeometryType => new LineString(coordinates) as TGeometry,
MultiLineString.InnerGeometryType => new MultiLineString(coordinates) as TGeometry,
MultiPoint.InnerGeometryType => new MultiPoint(coordinates) as TGeometry,
MultiPolygon.InnerGeometryType => new MultiPolygon(coordinates) as TGeometry,
Polygon.InnerGeometryType => new Polygon(coordinates) as TGeometry,
_ => default
};
return geometry;
}

public override void Write(Utf8JsonWriter writer, TGeometry value, JsonSerializerOptions options)
Expand Down

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