/// <summary>
/// Parses a GeometryCollection text.
/// </summary>
/// <param name="tokens">The list of tokens.</param>
/// <param name="is3D">bool value indicating whether GeometryCollection being parsed has z-coordinate.</param>
/// <param name="isMeasured">bool value indicating whether GeometryCollection being parsed has m-value.</param>
/// <returns>A GeometryCollection specified by tokens.</returns>
/// <remarks><![CDATA[<GeometryCollection text> ::= <empty set> | <left paren> <geometry tagged text> {<comma> <geometry tagged text>}* <right paren>]]></remarks>
private static GeometryCollection <Geometry> ParseGeometryCollectionText(WktTokensBuffer tokens, bool is3D, bool isMeasured)
{
WktToken t = tokens.Peek(true);
if (t.Type == TokenType.STRING && t.Value.ToUpperInvariant() == "EMPTY")
{
tokens.GetToken(true);
return(new GeometryCollection <Geometry>());
}
WktReader.Expect(TokenType.LEFT_PARENTHESIS, tokens);
GeometryCollection <Geometry> result = new GeometryCollection <Geometry>();
result.Geometries.Add(WktReader.ParseGeometryTaggedText(tokens));
t = tokens.Peek(true);
while (t.Type == TokenType.COMMA)
{
tokens.GetToken(true);
result.Geometries.Add(WktReader.ParseGeometryTaggedText(tokens));
t = tokens.Peek(true);
}
WktReader.Expect(TokenType.RIGHT_PARENTHESIS, tokens);
return(result);
}
/// <summary>
/// Reads next geometry from the input.
/// </summary>
/// <typeparam name="T">The type of Geometry to be parsed.</typeparam>
/// <returns>The geometry object of specific type read from the reader or null if no more geometries are available.</returns>
public T Read <T>() where T : Geometry
{
Geometry parsed = WktReader.ParseGeometryTaggedText(_tokens);
if (parsed != null)
{
T result = parsed as T;
if (result == null)
{
throw new WktParseException("Input doesn't contain valid WKB representation of the specified geometry type.");
}
return(result);
}
else
{
return(null);
}
}
/// <summary>
/// Parses a Geometry from WKT string.
/// </summary>
/// <param name="wkt">The string with WKT representation of a Geometry.</param>
/// <returns>The parsed Geometry.</returns>
public static Geometry Parse(string wkt)
{
WktTokensBuffer tokens = new WktTokensBuffer(WktTokenizer.Tokenize(wkt));
return(WktReader.ParseGeometryTaggedText(tokens));
}
/// <summary>
/// Reads next geometry from the input.
/// </summary>
/// <returns>The geometry object read from the reader or null if no more geometries are available.</returns>
public Geometry Read()
{
return(WktReader.ParseGeometryTaggedText(_tokens));
}
