public IGeometry Read(XmlReader reader)
{
if (reader.NodeType == XmlNodeType.EndElement)
throw new ArgumentException("EndElement node type cannot be read by GMLReader.");
if (IsStartElement(reader, "Point"))
return ReadPoint(reader);
if (IsStartElement(reader, "LineString"))
return ReadLineString(reader);
if (IsStartElement(reader, "Polygon"))
return ReadPolygon(reader);
if (IsStartElement(reader, "MultiPoint"))
return ReadMultiPoint(reader);
if (IsStartElement(reader, "MultiLineString"))
return ReadMultiLineString(reader);
if (IsStartElement(reader, "MultiPolygon"))
return ReadMultiPolygon(reader);
if (IsStartElement(reader, "MultiGeometry"))
return ReadGeometryCollection(reader);
// Go away until something readable is found...
reader.Read();
return Read(reader);
}
protected IMultiPolygon ReadMultiPolygon(XmlReader reader)
{
List<IPolygon> polygons = new List<IPolygon>();
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
if (IsStartElement(reader, "polygonMember"))
polygons.Add(ReadPolygon(reader));
break;
case XmlNodeType.EndElement:
string name = reader.Name;
if (name == "MultiPolygon" ||
name == GMLElements.gmlPrefix + ":MultiPolygon")
return Factory.CreateMultiPolygon(polygons.ToArray());
break;
}
}
throw new ArgumentException("ShouldNeverReachHere!");
}
protected IGeometryCollection ReadGeometryCollection(XmlReader reader)
{
List<IGeometry> collection = new List<IGeometry>();
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
if (IsStartElement(reader, "Point"))
collection.Add(ReadPoint(reader));
else if (IsStartElement(reader, "LineString"))
collection.Add(ReadLineString(reader));
else if (IsStartElement(reader, "Polygon"))
collection.Add(ReadPolygon(reader));
else if (IsStartElement(reader, "MultiPoint"))
collection.Add(ReadMultiPoint(reader));
else if (IsStartElement(reader, "MultiLineString"))
collection.Add(ReadMultiLineString(reader));
else if (IsStartElement(reader, "MultiPolygon"))
collection.Add(ReadMultiPolygon(reader));
else if (IsStartElement(reader, "MultiGeometry"))
collection.Add(ReadGeometryCollection(reader));
break;
case XmlNodeType.EndElement:
string name = reader.Name;
if (name == "MultiGeometry" ||
name == GMLElements.gmlPrefix + ":MultiGeometry")
return Factory.CreateGeometryCollection(collection.ToArray());
break;
}
}
throw new ArgumentException("ShouldNeverReachHere!");
}
protected IMultiLineString ReadMultiLineString(XmlReader reader)
{
List<ILineString> lines = new List<ILineString>();
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
if (IsStartElement(reader, "lineStringMember"))
lines.Add(ReadLineString(reader));
break;
case XmlNodeType.EndElement:
string name = reader.Name;
if (name == "MultiLineString" ||
name == GMLElements.gmlPrefix + ":MultiLineString")
return Factory.CreateMultiLineString(lines.ToArray());
break;
}
}
throw new ArgumentException("ShouldNeverReachHere!");
}
protected IPolygon ReadPolygon(XmlReader reader)
{
ILinearRing exterior = null;
List<ILinearRing> interiors = new List<ILinearRing>();
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
if (IsStartElement(reader, "outerBoundaryIs") ||
IsStartElement(reader, "exterior"))
exterior = ReadLinearRing(reader);// as LinearRing;
else if (IsStartElement(reader, "innerBoundaryIs") ||
IsStartElement(reader, "interior"))
interiors.Add(ReadLinearRing(reader));
break;
case XmlNodeType.EndElement:
string name = reader.Name;
if (name == "Polygon" ||
name == GMLElements.gmlPrefix + ":Polygon")
return Factory.CreatePolygon(exterior, interiors.ToArray());
break;
}
}
throw new ArgumentException("ShouldNeverReachHere!");
}
protected ILineString ReadLineString(XmlReader reader)
{
List<Coordinate> coordinates = new List<Coordinate>();
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
if (IsStartElement(reader, "coord"))
{
coordinates.Add(ReadCoordinate(reader));
}
else if (IsStartElement(reader, "pos"))
{
reader.Read();
string ordinates = reader.ReadContentAsString();
coordinates.Add(ReadPosAsCoordinate(ordinates.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)));
}
else if (IsStartElement(reader, "coordinates"))
{
reader.Read(); // Jump to values
string value = reader.Value;
string cleaned = value.Replace("\n", " ").Replace("\t", " ");
string[] coords = cleaned.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
foreach (string coord in coords)
{
if (String.IsNullOrEmpty(coord))
continue;
Coordinate c = ReadCoordinates(coord);
coordinates.Add(c);
}
return Factory.CreateLineString(coordinates.ToArray());
}
else if (IsStartElement(reader, "posList"))
{
string tmp = reader.GetAttribute("srsDimension");
if (string.IsNullOrEmpty(tmp)) tmp = "2";
reader.Read();
coordinates.AddRange(ReadPosListAsCoordinates(XmlConvert.ToInt32(tmp), reader.ReadContentAsString().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)));
reader.ReadEndElement();
return Factory.CreateLineString(coordinates.ToArray());
}
break;
case XmlNodeType.EndElement:
return Factory.CreateLineString(coordinates.ToArray());
}
}
throw new ArgumentException("ShouldNeverReachHere!");
}
protected IPoint ReadPoint(XmlReader reader)
{
string numOrdinatesText = reader.GetAttribute("srsDimension");
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
if (IsStartElement(reader, "coord"))
return Factory.CreatePoint(ReadCoordinate(reader));
if (IsStartElement(reader, "pos"))
{
reader.Read(); // Jump to values
string[] coords = reader.Value.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
if (!string.IsNullOrEmpty(numOrdinatesText))
{
int numOrdinates = XmlConvert.ToInt32(numOrdinatesText);
Assert.IsTrue(coords.Length == numOrdinates, "srsDimension doen't match number of provided ordinates");
}
return Factory.CreatePoint(ReadPosAsCoordinate(coords));
}
if (IsStartElement(reader, "coordinates"))
{
reader.Read(); // Jump to values
string[] coords = reader.Value.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
if (coords.Length != 1)
throw new ApplicationException("Should never reach here!");
Coordinate c = ReadCoordinates(coords[0]);
return Factory.CreatePoint(c);
}
break;
}
}
throw new ArgumentException("ShouldNeverReachHere!");
}
/// <summary>
/// Reads the coordinate.
/// </summary>
/// <param name="reader">The reader.</param>
/// <returns></returns>
protected Coordinate ReadCoordinate(XmlReader reader)
{
double x = 0, y = 0;
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
if (IsStartElement(reader, "X"))
{
reader.Read(); // Jump to X value
x = XmlConvert.ToDouble(reader.Value);
}
else if (IsStartElement(reader, "Y"))
{
reader.Read(); // Jump to Y value
y = XmlConvert.ToDouble(reader.Value);
}
break;
case XmlNodeType.EndElement:
if (reader.Name == GMLElements.gmlPrefix + ":coord")
return new Coordinate(x, y);
break;
}
}
throw new ArgumentException("ShouldNeverReachHere!");
}
