private static string GetNextWord(WktStreamTokenizer tokenizer)
{
TokenType type = tokenizer.NextToken();
string token = tokenizer.GetStringValue();
if (type == TokenType.Number)
{
throw new Exception("Expected a number but got " + token);
}
else if (type == TokenType.Word)
{
return(token.ToUpper());
}
else if (token == "(")
{
return("(");
}
else if (token == ")")
{
return(")");
}
else if (token == ",")
{
return(",");
}
throw new Exception("Not a valid symbol in WKT format.");
}
private static string GetNextCloserOrComma(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
string nextWord = tokenizer.GetStringValue();
if (nextWord == "," || nextWord == ")")
{
return(nextWord);
}
throw new Exception("Expected ')' or ',' but encountered '" + nextWord + "'");
}
private static string GetNextEmptyOrOpener(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
string nextWord = tokenizer.GetStringValue();
if (nextWord == "EMPTY" || nextWord == "(")
{
return(nextWord);
}
throw new Exception("Expected 'EMPTY' or '(' but encountered '" + nextWord + "'");
}
private static Geometry ReadGeometryTaggedText(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
string type = tokenizer.GetStringValue().ToUpper();
Geometry geometry = null;
switch (type)
{
case "POINT":
geometry = ReadPointText(tokenizer);
break;
case "LINESTRING":
geometry = ReadLineStringText(tokenizer);
break;
case "MULTIPOINT":
geometry = ReadMultiPointText(tokenizer);
break;
case "MULTILINESTRING":
geometry = ReadMultiLineStringText(tokenizer);
break;
case "POLYGON":
geometry = ReadPolygonText(tokenizer);
break;
case "MULTIPOLYGON":
geometry = ReadMultiPolygonText(tokenizer);
break;
case "GEOMETRYCOLLECTION":
geometry = ReadGeometryCollectionText(tokenizer);
break;
default:
throw new Exception(String.Format(Map.NumberFormatEnUs, "Geometrytype '{0}' is not supported.",
type));
}
return(geometry);
}
private static double GetNextNumber(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
return(tokenizer.GetNumericValue());
}