/// <summary>
/// Gets the feature type.
/// </summary>
/// <param name="fileName">File whose feature type should be returned.</param>
/// <returns>The feature type.</returns>
public FeatureType GetFeatureType(string fileName)
{
using (var reader = new OgrDataReader(fileName))
{
return(reader.GetFeatureType());
}
}
/// <summary>
/// Opens the specified file
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public IFeatureSet Open(string fileName)
{
IFeatureSet fs = new FeatureSet();
fs.Name = Path.GetFileNameWithoutExtension(fileName);
fs.Filename = fileName;
using (var reader = new OgrDataReader(fileName))
{
// skip the geometry column which is always column 0
for (int i = 1; i < reader.FieldCount; i++)
{
string sFieldName = reader.GetName(i);
Type type = reader.GetFieldType(i);
int uniqueNumber = 1;
string uniqueName = sFieldName;
while (fs.DataTable.Columns.Contains(uniqueName))
{
uniqueName = sFieldName + uniqueNumber;
uniqueNumber++;
}
fs.DataTable.Columns.Add(new DataColumn(uniqueName, type));
}
var wkbReader = new WKBReader();
while (reader.Read())
{
var wkbGeometry = (byte[])reader["Geometry"];
var geometry = wkbReader.Read(wkbGeometry);
IFeature feature = new Feature(geometry);
feature.DataRow = fs.DataTable.NewRow();
for (int i = 1; i < reader.FieldCount; i++)
{
object value = reader[i];
if (value == null)
{
value = DBNull.Value;
}
feature.DataRow[i - 1] = value;
}
fs.Features.Add(feature);
}
try
{
fs.Projection = reader.GetProj4ProjectionInfo();
}
catch (Exception ex)
{
Trace.WriteLine(ex);
}
}
return(fs);
}
/// <summary>
/// Opens the given file.
/// </summary>
/// <param name="fileName">Name of the file that should be opened.</param>
public void Open(string fileName)
{
Dispose();
_fileName = fileName;
_groupName = Path.GetFileNameWithoutExtension(fileName);
using var reader = new OgrDataReader(fileName);
_dataSets = reader.GetLayers();
}
/// <summary>
/// Gets the IMapSelfLoadLayer that contains all the DataSets as Layers and can be added to the map.
/// </summary>
/// <param name="layerNames">The names of the layers that should be loaded. If this is null all layers get loaded.</param>
/// <returns>Null, if there are no DataSets, a MapSelfLoadLayer if there is only 1 DataSet otherwise a MapSelfLoadGroup with layers for the existing DataSets.</returns>
public IMapSelfLoadLayer GetLayer(string[] layerNames)
{
if (_dataSets.Count < 1)
{
return(null);
}
if (_dataSets.Count > 1)
{
// return a group with all the layers
var gr = new MapSelfLoadGroup
{
LegendText = _groupName,
DataSet = this,
FilePath = _fileName
};
foreach (var ds in _dataSets)
{
if (layerNames == null || layerNames.Contains(ds.Key.Name))
{
IMapFeatureLayer l = gr.Layers.Add(ds.Key);
OgrDataReader.TranslateStyles(l, ds.Value);
l.IsExpanded = false;
}
}
return(gr);
}
// return the single existing layer
var fs = _dataSets.Keys.FirstOrDefault();
if (fs == null || (layerNames != null && !layerNames.Contains(fs.Name)))
{
return(null);
}
IMapSelfLoadLayer layer;
switch (fs.FeatureType)
{
case FeatureType.MultiPoint:
case FeatureType.Point:
layer = new MapSelfLoadPointLayer(fs);
break;
case FeatureType.Line:
layer = new MapSelfLoadLineLayer(fs);
break;
case FeatureType.Polygon:
layer = new MapSelfLoadPolygonLayer(fs);
break;
default:
return(null);
}
OgrDataReader.TranslateStyles((IMapFeatureLayer)layer, _dataSets[fs]);
layer.IsExpanded = false;
return(layer);
}
