/
EnvelopeConverter.cs
64 lines (52 loc) · 2.19 KB
/
EnvelopeConverter.cs
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using System.Globalization;
namespace NetTopologySuite.IO.Converters
{
using System;
using System.Diagnostics;
using GeoAPI.Geometries;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
public class EnvelopeConverter : JsonConverter
{
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
Envelope envelope = value as Envelope;
if (envelope == null)
{
writer.WriteToken(null);
return;
}
writer.WriteStartArray();
writer.WriteValue(envelope.MinX);
writer.WriteValue(envelope.MinY);
writer.WriteValue(envelope.MaxX);
writer.WriteValue(envelope.MaxY);
writer.WriteEndArray();
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
Debug.Assert(reader.TokenType == JsonToken.PropertyName);
Debug.Assert((string)reader.Value == "bbox");
reader.Read(); // move to array start
if (reader.TokenType != JsonToken.Null)
{
JArray envelope = serializer.Deserialize<JArray>(reader);
Debug.Assert(envelope.Count == 4);
double minX = Double.Parse((string) envelope[0], NumberFormatInfo.InvariantInfo);
double minY = Double.Parse((string) envelope[1], NumberFormatInfo.InvariantInfo);
double maxX = Double.Parse((string) envelope[2], NumberFormatInfo.InvariantInfo);
double maxY = Double.Parse((string) envelope[3], NumberFormatInfo.InvariantInfo);
Debug.Assert(minX <= maxX);
Debug.Assert(minY <= maxY);
reader.Read(); // move away from array end
return new Envelope(minX, maxX, minY, maxY);
}
reader.Read(); // move away from array end
return null;
}
public override bool CanConvert(Type objectType)
{
return objectType == typeof(Envelope);
}
}
}