/// <summary>
/// Reads a generic stream containing geographic data saved as shapefile structure,
/// and returns a collection of all the features contained.
/// Since NTS Geometry Model not support Z and M data, those informations are ignored if presents in shapefile.
/// </summary>
/// <param name="stream">Shapefile data stream.</param>
/// <returns><c>GeometryCollection</c> containing all geometries in shapefile.</returns>
protected IGeometryCollection Read(Stream stream)
{
// Read big endian values
using (BigEndianBinaryReader beReader = new BigEndianBinaryReader(stream))
{
// Verify File Code
int fileCode = beReader.ReadInt32BE();
Debug.Assert(fileCode == 9994);
stream.Seek(20, SeekOrigin.Current);
length = beReader.ReadInt32BE();
// Read little endian values
using (BinaryReader leReader = new BinaryReader(stream))
{
ArrayList list = null;
// Verify Version
int version = leReader.ReadInt32();
Debug.Assert(version == 1000);
// ShapeTypes
int shapeType = leReader.ReadInt32();
switch ((ShapeGeometryTypes)shapeType)
{
case ShapeGeometryTypes.Point:
case ShapeGeometryTypes.PointZ:
case ShapeGeometryTypes.PointM:
case ShapeGeometryTypes.PointZM:
list = new ArrayList(ReadPointData(stream));
break;
case ShapeGeometryTypes.LineString:
case ShapeGeometryTypes.LineStringZ:
case ShapeGeometryTypes.LineStringM:
case ShapeGeometryTypes.LineStringZM:
list = new ArrayList(ReadLineStringData(stream));
break;
case ShapeGeometryTypes.Polygon:
case ShapeGeometryTypes.PolygonZ:
case ShapeGeometryTypes.PolygonM:
case ShapeGeometryTypes.PolygonZM:
list = new ArrayList(ReadPolygonData(stream));
break;
case ShapeGeometryTypes.MultiPoint:
case ShapeGeometryTypes.MultiPointZ:
case ShapeGeometryTypes.MultiPointM:
case ShapeGeometryTypes.MultiPointZM:
list = new ArrayList(ReadMultiPointData(stream));
break;
case ShapeGeometryTypes.MultiPatch:
throw new NotImplementedException("FeatureType " + shapeType + " not supported.");
default:
throw new ArgumentOutOfRangeException("FeatureType " + shapeType + " not recognized by the system");
}
IGeometryCollection collection = shapeReader.CreateGeometryCollection(list);
return(collection);
}
}
}
