protected virtual void ConvertFolder(KmlFolder folder, GeoJsonFeatureCollection collection, KmlFeature feature, IStyleProvider provider)
{
switch (feature)
{
case KmlPlacemark placemark:
collection.Add(ConvertPlacemark(placemark, provider));
break;
case KmlDocument document:
// Why would you have a document in a folder? (although it seems legal according to the specification)
case KmlFolder childFolder:
// Why would you have folder in another folder? (although it seems legal according to the specification)
default:
throw new KmlException("Unsupported feature " + feature.GetType());
}
}
protected virtual GeoJsonFeatureCollection[] ConvertDocument(KmlDocument document, IStyleProvider provider)
{
// Use the style provider of the document if not explicitly specified
provider = provider ?? document.StyleSelectors;
// Initialize a new list of collections
List <GeoJsonFeatureCollection> collections = new List <GeoJsonFeatureCollection>();
if (document.Features.Any(x => x is KmlFolder))
{
GeoJsonFeatureCollection defaultCollection = null;
foreach (KmlFeature feature in document.Features)
{
switch (feature)
{
case KmlDocument _:
throw new KmlException("Weird place for a <Document>, huh?");
case KmlFolder folder:
collections.Add(ConvertFolder(folder, provider));
break;
case KmlPlacemark placemark:
// Make sure the default feature collection is initialized
if (defaultCollection == null)
{
collections.Add(defaultCollection = new GeoJsonFeatureCollection());
}
// As the placemark isn't located inside a folder, we should append it to a "default" feature collection"
defaultCollection.Add(ConvertPlacemark(placemark, provider));
break;
default:
throw new KmlException("Unsupported feature " + feature.GetType());
}
}
}
else
{
GeoJsonFeatureCollection features = new GeoJsonFeatureCollection();
foreach (KmlFeature feature in document.Features)
{
switch (feature)
{
case KmlDocument _:
throw new KmlException("Weird place for a <Document>, huh?");
case KmlPlacemark placemark:
features.Add(ConvertPlacemark(placemark, provider));
break;
default:
throw new KmlException("Unsupported feature " + feature.GetType());
}
}
collections.Add(features);
}
return(collections.ToArray());
}