public virtual Layer CreateLayer()
{
var layer = new Layer();
layer.FeatureType = this;
layer.Name = Name;
return layer;
}
public LayerFailedEventArgs(Layer layer, Exception exception)
: base(layer)
{
Exception = exception;
}
public TreeNode AddLayerNode(TreeNode parent, Layer layer)
{
return AddContainterNode(parent, new LayerWrapper(layer), cmnLayer);
}
public virtual IEnumerable<Feature> GetFeatures(FeatureType featureType, Layer layer, Envelope window)
{
return new Feature[0];
}
public LayerEventArgs(Layer layer)
{
Layer = layer;
}
public TreeNode AddLayerNode(Layer layer)
{
return AddContainterNode(FindParentGroup(), new LayerWrapper(layer), cmnLayer);
}
public LayerRenderer(Renderer renderer, Layer layer, IBaseRenderer parent)
: base(renderer, layer, parent)
{
_layer = layer;
}
public abstract FeatureType GetFeatureType(Layer layer);
public abstract IEnumerable<Feature> GetFeatures(FeatureType featureType, Layer layer, Envelope window);
public LayerWrapper(Layer layer)
: base(layer)
{
Layer = layer;
}
public override IEnumerable<Feature> GetFeatures(FeatureType featureType, Layer layer, Envelope window)
{
var cmd = _useCounter > 0 ? CreateCommand(Connection) : GetOrCreateCommand(Connection);
_useCounter++;
try
{
SetParameters(cmd, window);
using (var reader = cmd.ExecuteReader())
{
var geomOrdinal = reader.GetOrdinal(GeometryColumn);
if (geomOrdinal < 0) throw new Exception("Geometry column not found: " + GeometryColumn);
var fidOrdinal = string.IsNullOrEmpty(FidColumn) ? -1 : reader.GetOrdinal(FidColumn);
var buffer = new byte[1024];
var fieldCount = reader.FieldCount;
var values = new object[fieldCount];
var geoReader = new GaiaGeoReader();
while (reader.Read())
{
long fid;
if (fidOrdinal >= 0)
{
fid = reader.GetInt64(fidOrdinal);
values[fidOrdinal] = fid;
}
else
fid = 0;
for (int i = 0; i < fieldCount; i++)
if (i != fidOrdinal && i != geomOrdinal)
values[i] = reader.GetValue(i);
var len = (int)reader.GetBytes(geomOrdinal, 0L, null, 0, 0);
if (len > buffer.Length)
buffer = new byte[len];
reader.GetBytes(geomOrdinal, 0L, buffer, 0, len);
IGeometry geom;
try
{
geom = geoReader.Read(buffer, 0, len);
if (geom == null) continue;
}
catch (Exception ex)
{
Trace.WriteLine(string.Format("Invalid geometry while reading {0} Fid={1}: {2}", ToString(), fid, ex.Message));
continue;
}
//var geom = GeometryReader.ReadBlobGeometry(new MemoryStream(buffer, 0, buffer.Length));
values[geomOrdinal] = geom;
//featureType.GeometryType = geom.OgcGeometryType;
var feature = featureType.NewFeature(fid, values);
feature.Geometry = geom;
yield return feature;
}
}
}
finally
{
_useCounter--;
}
}
