public CosmoDbFeatureCursor(CosmoDbFeatureClass fc, IQueryFilter filter)
: base(fc.SpatialReference, filter.FeatureSpatialReference)
{
string sql = String.Empty;
if (filter is ISpatialFilter)
{
ISpatialFilter sFilter = (ISpatialFilter)filter;
var env = sFilter.Geometry.Envelope;
env.minx = Math.Max(-170, env.minx);
env.miny = Math.Max(-80, env.miny);
env.maxx = Math.Min(170, env.maxx);
env.maxy = Math.Min(80, env.maxy);
//sql = $"SELECT e._shape FROM everything e WHERE e._fc='{fc.Name}' AND ST_WITHIN(e._shape, {{'type':'Polygon', 'coordinates': [[[{env.miny.ToString(_nhi)}, {env.minx.ToString(_nhi)}], [{env.maxy.ToString(_nhi)}, {env.minx.ToString(_nhi)}], [{env.maxy.ToString(_nhi)}, {env.maxx.ToString(_nhi)}], [{env.miny.ToString(_nhi)}, {env.maxx.ToString(_nhi)}], [{env.miny.ToString(_nhi)}, {env.minx.ToString(_nhi)}]]]}})";
sql = $"SELECT e._shape FROM everything e WHERE e._fc='{fc.Name}' AND ST_WITHIN(e._shape, {{'type':'Polygon', 'coordinates': [[[{env.minx.ToString(_nhi)}, {env.miny.ToString(_nhi)}], [{env.maxx.ToString(_nhi)}, {env.miny.ToString(_nhi)}], [{env.maxx.ToString(_nhi)}, {env.maxy.ToString(_nhi)}], [{env.minx.ToString(_nhi)}, {env.maxy.ToString(_nhi)}], [{env.minx.ToString(_nhi)}, {env.miny.ToString(_nhi)}]]]}})";
}
else
{
sql = $"SELECT * FROM everything e WHERE e._fc='{fc.Name}'";
}
//var query =
// fc.CosmoDocumentClient.CreateDocumentQuery(fc.CosmoDocumentCollection.SelfLink, sql)
// .AsEnumerable()
// .ToArray();
_query =
fc.CosmoDocumentClient.CreateDocumentQuery(fc.CosmoDocumentCollection.SelfLink, sql)
.AsDocumentQuery();
}
async static public Task <CosmoDbFeatureClass> Create(CosmoDbDataset dataset, Json.SpatialCollectionItem spatialCollectoinItem)
{
var fc = new CosmoDbFeatureClass();
fc.Dataset = dataset;
fc.Name = spatialCollectoinItem.Name;
if (spatialCollectoinItem.GeometryDef != null)
{
fc.HasZ = spatialCollectoinItem.GeometryDef.HasZ;
fc.HasM = spatialCollectoinItem.GeometryDef.HasM;
fc.GeometryType = spatialCollectoinItem.GeometryDef.GeometryType;
fc.SpatialReference = dataset._spatialReference; // ToDo
}
var fields = new Fields();
if (spatialCollectoinItem.Fields != null)
{
foreach (var field in spatialCollectoinItem.Fields)
{
fields.Add(new Field()
{
name = field.Name,
type = field.FieldType
});
}
}
fc.Fields = fields;
fc.CosmoDocumentClient = dataset._client;
fc.CosmoDocumentCollection = dataset.GetFeatureCollection(fc.GeometryType);
fc.Envelope = null;
using (var cursor = new CosmoDbFeatureCursor(fc, new QueryFilter()))
{
IFeature feature = null;
while ((feature = await cursor.NextFeature()) != null)
{
if (feature.Shape == null)
{
continue;
}
if (fc.Envelope == null)
{
fc.Envelope = feature.Shape.Envelope;
}
else
{
fc.Envelope.Union(feature.Shape.Envelope);
}
}
}
return(fc);
}
async public Task <IDatasetElement> Element(string title)
{
var result = _client.CreateDocumentQuery <Json.SpatialCollectionItem>(_spatialCollectionRef.SelfLink)
.Where(d => d.Name == title)
.AsEnumerable <Json.SpatialCollectionItem>()
.FirstOrDefault();
if (result == null)
{
return(null);
}
return(new DatasetElement(await CosmoDbFeatureClass.Create(this, result))
{
Title = result.Name
});
}
async public Task <List <IDatasetElement> > Elements()
{
if (_layers != null)
{
return(_layers);
}
List <IDatasetElement> layers = new List <IDatasetElement>();
foreach (var collectionItem in _client.CreateDocumentQuery <Json.SpatialCollectionItem>(_spatialCollectionRef.SelfLink).AsEnumerable())
{
layers.Add(new DatasetElement(await CosmoDbFeatureClass.Create(this, collectionItem)));
}
_layers = layers;
return(_layers);
}
