private static void IfIsObjDo <T>(IGeoWalkContext obj, Action <GeoWalkContext <T> > actionWithItem) where T : GeoJSONObject
{
if (obj.Item is T)
{
actionWithItem(obj.Repurpose <T>());
}
}
private void DispatchVisitor <T>(IGeoWalkContext currentContext, IEnumerable <T> items, IGeoJsonObjectVisitor visitor)
{
foreach (var geoObj in items)
{
AcceptVisitor(currentContext.SpawnForChild((GeoJSONObject)(object)geoObj), visitor);
}
}
private void AcceptVisitor(IGeoWalkContext obj, IGeoJsonObjectVisitor visitor)
{
IfIsObjDo <Point>(obj, visitor.Visit);
IfIsObjDo <MultiPoint>(obj, m =>
{
visitor.Visit(m);
DispatchVisitor(m, m.Item.Coordinates, visitor);
m.CallExitActivity();
});
IfIsObjDo <LineString>(obj, visitor.Visit);
IfIsObjDo <MultiLineString>(obj, mls =>
{
visitor.Visit(mls);
DispatchVisitor(mls, mls.Item.Coordinates, visitor);
mls.CallExitActivity();
});
IfIsObjDo <Polygon>(obj, pl =>
{
visitor.Visit(pl);
DispatchVisitor(pl, pl.Item.Coordinates, visitor);
pl.CallExitActivity();
});
IfIsObjDo <MultiPolygon>(obj, mpl =>
{
visitor.Visit(mpl);
DispatchVisitor(mpl, mpl.Item.Coordinates, visitor);
mpl.CallExitActivity();
});
IfIsObjDo <GeometryCollection>(obj, gcl =>
{
visitor.Visit(gcl);
DispatchVisitor(gcl, gcl.Item.Geometries, visitor);
gcl.CallExitActivity();
});
IfIsObjDo <FeatureCollection>(obj, fcl =>
{
visitor.Visit(fcl);
DispatchVisitor(fcl, fcl.Item.Features, visitor);
fcl.CallExitActivity();
});
IfIsObjDo <Feature>(obj, f =>
{
visitor.Visit(f);
AcceptVisitor(f.SpawnForChild((GeoJSONObject)f.Item.Geometry), visitor);
f.CallExitActivity();
});
}
/// <summary>
/// Check if there is a parent and if its item is of type T.
/// Returns true if those conditions are met.
/// </summary>
public static bool HasParentCorrespondingTo <T>(this IGeoWalkContext ctx)
{
return(ctx.Parent != null && ctx.Parent.Item is T);
}
private GeoWalkContext(T item, int depth, IGeoWalkContext parent)
{
CurrentDepth = depth;
Item = item;
Parent = parent;
}
