private static IGeometry ParseWkbMultiPolygon(byte[] blob, ref int offset, IGeometryFactory factory, ReadCoordinatesFunction readCoordinates, GaiaImport gaiaImport)
{
var number = gaiaImport.GetInt32(blob, ref offset);
var polygons = new IPolygon[number];
for (var i = 0; i < number; i++)
{
if (blob[offset++] != (byte)GaiaGeoBlobMark.GAIA_MARK_ENTITY)
{
throw new Exception();
}
var gt = gaiaImport.GetInt32(blob, ref offset);
if (ToBaseGeometryType((GaiaGeoGeometry)gt) != GaiaGeoGeometry.GAIA_POLYGON)
{
throw new Exception();
}
//Since Uncompressed MultiGeom can contain compressed we need to set it here also
readCoordinates = SetReadCoordinatesFunction(gaiaImport, (GaiaGeoGeometry)gt);
polygons[i] = ParseWkbPolygon(blob, ref offset, factory, readCoordinates, gaiaImport);
}
return(factory.CreateMultiPolygon(polygons));
}
private static IMultiLineString ParseWkbMultiLineString(byte[] blob, ref int offset, IGeometryFactory factory, ReadCoordinatesFunction readCoordinates, GaiaImport gaiaImport)
{
int number = gaiaImport.GetInt32(blob, ref offset);
var lineStrings = new ILineString[number];
for (var i = 0; i < number; i++)
{
if (blob[offset++] != (byte)GaiaGeoBlobMark.GAIA_MARK_ENTITY)
{
throw new Exception();
}
var gt = gaiaImport.GetInt32(blob, ref offset);
if (ToBaseGeometryType((GaiaGeoGeometry)gt) != GaiaGeoGeometry.GAIA_LINESTRING)
{
throw new Exception();
}
//Since Uncompressed MultiGeom can contain compressed we need to set it here also
readCoordinates = SetReadCoordinatesFunction(gaiaImport, (GaiaGeoGeometry)gt);
lineStrings[i] = ParseWkbLineString(blob, ref offset, factory, factory.CreateLineString, readCoordinates, gaiaImport);
}
return(factory.CreateMultiLineString(lineStrings));
}
private static IGeometryCollection ParseWkbGeometryCollection(byte[] blob, ref int offset, IGeometryFactory factory, GaiaImport gaiaImport)
{
var number = gaiaImport.GetInt32(blob, ref offset);
var geometries = new IGeometry[number];
for (var i = 0; i < number; i++)
{
if (blob[offset++] != (byte)GaiaGeoBlobMark.GAIA_MARK_ENTITY)
{
throw new Exception();
}
geometries[i] = ParseWkbGeometry((GaiaGeoGeometry)gaiaImport.GetInt32(blob, ref offset), blob, ref offset, factory, gaiaImport);
}
return(factory.CreateGeometryCollection(geometries));
}
private static ILineString ParseWkbLineString(byte[] blob, ref int offset, IGeometryFactory factory, CreateLineStringFunction createLineStringFunction, ReadCoordinatesFunction readCoordinates, GaiaImport gaiaImport)
{
var number = gaiaImport.GetInt32(blob, ref offset);
var sequence = readCoordinates(blob, ref offset, number, gaiaImport, factory.CoordinateSequenceFactory,
factory.PrecisionModel);
return(createLineStringFunction(sequence));
}
private static IPolygon ParseWkbPolygon(byte[] blob, ref int offset, IGeometryFactory factory, ReadCoordinatesFunction readCoordinates, GaiaImport gaiaImport)
{
var number = gaiaImport.GetInt32(blob, ref offset) - 1;
var shell = (ILinearRing)ParseWkbLineString(blob, ref offset, factory, factory.CreateLinearRing, readCoordinates, gaiaImport);
var holes = new ILinearRing[number];
for (var i = 0; i < number; i++)
{
holes[i] = (ILinearRing)ParseWkbLineString(blob, ref offset, factory, factory.CreateLinearRing, readCoordinates, gaiaImport);
}
return(factory.CreatePolygon(shell, holes));
}
