public void FromJSON(JsonTextReader reader)
{
Dictionary.Clear();
if (reader.MoveToContent() && reader.TokenClass == JsonTokenClass.Array)
{
reader.ReadToken(JsonTokenClass.Array);
while (reader.TokenClass == JsonTokenClass.Object)
{
reader.ReadToken(JsonTokenClass.Object);
//read the 'key'
reader.ReadMember();
string key = reader.ReadString();
string type = null;
string stringValue = null;
object value = null;
//read the 'type'
reader.ReadMember();
if (reader.TokenClass == JsonTokenClass.Null)
{
reader.ReadNull();
//read the value (should be NULL)
reader.ReadMember();
if (reader.TokenClass == JsonTokenClass.Null)
{
reader.ReadNull();
}
else
{
stringValue = reader.ReadString();
}
}
else
{
//read the type
type = reader.ReadString();
//read the 'value'
reader.ReadMember();
stringValue = reader.ReadString();
}
if (!string.IsNullOrEmpty(type) && !string.IsNullOrEmpty(stringValue))
{
Type t = Type.GetType(type);
TypeConverter typeConverter = TypeDescriptor.GetConverter(t);
value = typeConverter.ConvertFromString(stringValue);
}
Dictionary.Add(key, value);
reader.ReadToken(JsonTokenClass.EndObject);
}
reader.ReadToken(JsonTokenClass.EndArray);
}
}
public static void ReadGISFeature(IGISFeature feature, JsonTextReader jreader)
{
if (feature == null)
{
throw new ArgumentNullException("feature", "A valid feature reference is required.");
}
if (jreader == null)
{
throw new ArgumentNullException("jreader", "A valid JSON reader object is required.");
}
if (jreader.MoveToContent() && jreader.TokenClass == JsonTokenClass.Object)
{
jreader.ReadToken(JsonTokenClass.Object);
//Read the 'Feature' as the type
jreader.ReadMember(); //reads 'type'
jreader.ReadString(); //reads 'Feature'
//Read the 'geometry'
jreader.ReadMember(); //reads 'geometry'
feature.Shape = Read(jreader); //reads the geometry value
//Read the 'properties'
jreader.ReadMember(); //reads 'properties'
ReadGISAttributes(feature.Attributes, jreader);
jreader.ReadToken(JsonTokenClass.EndObject);
}
}
public static IEnumerable <Feature> ReadFeatureCollection(JsonTextReader jreader)
{
if (jreader == null)
{
throw new ArgumentNullException("jreader", "A valid JSON reader object is required.");
}
List <Feature> features = new List <Feature>();
if (jreader.MoveToContent() && jreader.TokenClass == JsonTokenClass.Object)
{
jreader.ReadToken(JsonTokenClass.Object);
//Read the 'FeatureCollection' as the type
jreader.ReadMember(); //reads 'type'
jreader.ReadString(); //reads 'FeatureCollection'
//Read the 'features' property
jreader.ReadMember(); //reads 'features'
if (jreader.TokenClass == JsonTokenClass.Array)
{
jreader.ReadToken(JsonTokenClass.Array);
while (jreader.TokenClass == JsonTokenClass.Object)
{
features.Add(ReadFeature(jreader));
}
jreader.ReadToken(JsonTokenClass.EndArray);
}
jreader.ReadToken(JsonTokenClass.EndObject);
return(features);
}
return(null);
}
public static void ReadGISAttributes(IGISAttributes attributes, JsonTextReader jreader)
{
if (attributes == null)
{
throw new ArgumentNullException("attributes", "A valid attributes reference is required.");
}
if (jreader == null)
{
throw new ArgumentNullException("jreader", "A valid JSON reader object is required.");
}
if (jreader.MoveToContent() && jreader.TokenClass == JsonTokenClass.Object)
{
jreader.ReadToken(JsonTokenClass.Object);
while (jreader.TokenClass == JsonTokenClass.Member)
{
string key = jreader.ReadMember();
string value = jreader.ReadString();
attributes.SetValue(key, value);
}
jreader.ReadToken(JsonTokenClass.EndObject);
}
}
public static IAttributesTable ReadAttributesTable(JsonTextReader jreader)
{
if (jreader == null)
{
throw new ArgumentNullException("jreader", "A valid JSON reader object is required.");
}
IAttributesTable attributes = null;
if (jreader.MoveToContent() && jreader.TokenClass == JsonTokenClass.Object)
{
attributes = new AttributesTable();
jreader.ReadToken(JsonTokenClass.Object);
while (jreader.TokenClass == JsonTokenClass.Member)
{
string key = jreader.ReadMember();
string value = jreader.ReadString();
if (!attributes.Exists(key))
{
attributes.AddAttribute(key, null);
}
attributes[key] = value;
}
jreader.ReadToken(JsonTokenClass.EndObject);
}
return(attributes);
}
public static Feature ReadFeature(JsonTextReader jreader)
{
if (jreader == null)
{
throw new ArgumentNullException("jreader", "A valid JSON reader object is required.");
}
Feature feature = new Feature();
if (jreader.MoveToContent() && jreader.TokenClass == JsonTokenClass.Object)
{
jreader.ReadToken(JsonTokenClass.Object);
//Read the 'Feature' as the type
jreader.ReadMember(); //reads 'type'
jreader.ReadString(); //reads 'Feature'
//Read the 'geometry'
jreader.ReadMember(); //reads 'geometry'
feature.Geometry = Read(jreader); //reads the geometry value
//Read the 'properties'
jreader.ReadMember(); //reads 'properties'
feature.Attributes = ReadAttributesTable(jreader);
jreader.ReadToken(JsonTokenClass.EndObject);
}
return(feature);
}
public static FeatureWithID ReadFeatureWithID(JsonTextReader jreader)
{
if (jreader == null)
{
throw new ArgumentNullException("jreader", "A valid JSON reader object is required.");
}
FeatureWithID feature = new FeatureWithID();
if (jreader.MoveToContent() && jreader.TokenClass == JsonTokenClass.Object)
{
jreader.ReadToken(JsonTokenClass.Object);
string key = "";
JsonTokenClass tokenClass;
while ((tokenClass = jreader.TokenClass) == JsonTokenClass.Member)
{
key = jreader.ReadMember();
switch (key)
{
case "type":
if (!jreader.ReadString().Equals("Feature"))
{
throw new Exception("jreader - A valid JSON reader object is required.");
}
break;
case "id":
feature.Id = jreader.ReadString();
break;
case "geometry":
feature.Geometry = Read(jreader); //reads the geometry value
//jreader.ReadMember(); //reads 'properties'
//feature.Attributes = ReadAttributesTableWithID(jreader);
break;
case "properties":
feature.Attributes = ReadAttributesTableWithID(jreader);
//jreader.ReadMember(); //reads 'geometry'
//feature.Geometry = Read(jreader); //reads the geometry value
break;
default:
throw new Exception("jreader - Feature - unexpected member");
break;
}
}
//if (tokenClass != JsonTokenClass.EndObject)
//{
// throw new Exception("expected endobject");
//}
jreader.ReadToken(JsonTokenClass.EndObject);
}
return(feature);
}
public static void Read(ref ICoordinate[] coordinates, JsonTextReader jreader)
{
if (jreader == null)
{
throw new ArgumentNullException("reader", "A valid JSON reader object is required.");
}
if (jreader.MoveToContent() && jreader.TokenClass == JsonTokenClass.Array)
{
jreader.ReadToken(JsonTokenClass.Array);
List <ICoordinate> list = new List <ICoordinate>();
while (jreader.TokenClass == JsonTokenClass.Array)
{
ICoordinate item = new GisSharpBlog.NetTopologySuite.Geometries.Coordinate();
Read(ref item, jreader);
list.Add(item);
}
jreader.ReadToken(JsonTokenClass.EndArray);
coordinates = list.ToArray();
}
}
public static void Read(ref ICoordinate coordinate, JsonTextReader jreader)
{
if (coordinate == null)
{
throw new ArgumentNullException("coordinate", "A valid coordinate reference is required.");
}
if (jreader == null)
{
throw new ArgumentNullException("jreader", "A valid JSON reader object is required.");
}
if (jreader.MoveToContent() && jreader.TokenClass == JsonTokenClass.Array)
{
jreader.ReadToken(JsonTokenClass.Array);
coordinate.X = Convert.ToDouble(jreader.ReadNumber());
coordinate.Y = Convert.ToDouble(jreader.ReadNumber());
coordinate.Z = double.NaN;
if (jreader.TokenClass == JsonTokenClass.Number)
{
coordinate.Z = Convert.ToDouble(jreader.ReadNumber());
}
jreader.ReadToken(JsonTokenClass.EndArray);
}
}
public static IGeometry Read(JsonTextReader jreader)
{
if (jreader == null)
{
throw new ArgumentNullException("reader", "A valid JSON reader object is required.");
}
IGeometry geometry = null;
if (jreader.MoveToContent())
{
if (jreader.TokenClass == JsonTokenClass.Object)
{
jreader.ReadToken(JsonTokenClass.Object);
//Read the 'type' property that indicates the type of the geometry or object
jreader.ReadMember();
string geometryType = jreader.ReadString();
switch (geometryType)
{
case "Point":
//Read the 'coordinates' property
jreader.ReadMember();
geometry = ReadPoint(jreader);
break;
case "MultiPoint":
//Read the 'coordinates' property
jreader.ReadMember();
geometry = ReadMultiPoint(jreader);
break;
case "LineString":
//Read the 'coordinates' property
jreader.ReadMember();
geometry = ReadLineString(jreader);
break;
case "MultiLineString":
//Read the 'coordinates' property
jreader.ReadMember();
geometry = ReadMultiLineString(jreader);
break;
case "Polygon":
//Read the 'coordinates' property
jreader.ReadMember();
geometry = ReadPolygon(jreader);
break;
case "MultiPolygon":
//Read the 'coordinates' property
jreader.ReadMember();
geometry = ReadMultiPolygon(jreader);
break;
case "GeometryCollection":
//Read the 'coordinates' property
jreader.ReadMember();
geometry = ReadGeometryCollection(jreader);
break;
default:
break;
}
jreader.ReadToken(JsonTokenClass.EndObject);
}
}
return(geometry);
}
