C# WktStreamTokenizer.GetStringValue方法代码示例

        /// <summary>
        /// Reads and parses a WKT-formatted projection string.
        /// </summary>
        /// <param name="wkt">String containing WKT.</param>
        /// <returns>Object representation of the WKT.</returns>
        /// <exception cref="System.ArgumentException">If a token is not recognised.</exception>
        public static IInfo Parse(string wkt)
        {
            IInfo returnObject = null;
            StringReader reader = new StringReader(wkt);
            WktStreamTokenizer tokenizer = new WktStreamTokenizer(reader);
            tokenizer.NextToken();
            string objectName = tokenizer.GetStringValue();
            switch (objectName)
            {
                case "UNIT":
                    returnObject = ReadUnit(tokenizer);
                    break;
                //case "VERT_DATUM":
                //    IVerticalDatum verticalDatum = ReadVerticalDatum(tokenizer);
                //    returnObject = verticalDatum;
                //    break;
                case "SPHEROID":
                    returnObject = ReadEllipsoid(tokenizer);
                    break;
                case "DATUM":
                    returnObject = ReadHorizontalDatum(tokenizer); ;
                    break;
                case "PRIMEM":
                    returnObject = ReadPrimeMeridian(tokenizer);
                    break;
                case "VERT_CS":
                case "GEOGCS":
                case "PROJCS":
                case "COMPD_CS":
                case "GEOCCS":
                case "FITTED_CS":
                case "LOCAL_CS":
                    returnObject = ReadCoordinateSystem(wkt, tokenizer);
                    break;
                default:
                    throw new ArgumentException(String.Format("'{0'} is not recongnized.", objectName));

            }
            reader.Close();
            return returnObject;
        }

 /// <summary>
 /// Creates a Geometry using the next token in the stream.
 /// </summary>
 /// <param name="tokenizer">Tokenizer over a stream of text in Well-known Text
 /// format. The next tokens must form a &lt;Geometry Tagged Text&gt;.</param>
 /// <returns>Returns a Geometry specified by the next token in the stream.</returns>
 /// <remarks>
 /// Exception is thrown if the coordinates used to create a Polygon
 /// shell and holes do not form closed linestrings, or if an unexpected
 /// token is encountered.
 /// </remarks>
 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(CultureInfo.InvariantCulture, "Geometrytype '{0}' is not supported.",
                                               type));
     }
     return geometry;
 }

        /// <summary>
        /// Returns the next word in the stream as uppercase text.
        /// </summary>
        /// <param name="tokenizer">Tokenizer over a stream of text in Well-known Text
        /// format. The next token must be a word.</param>
        /// <returns>Returns the next word in the stream as uppercase text.</returns>
        /// <remarks>
        /// Exception is thrown if the next token is not a word.
        /// </remarks>
        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.");
        }

 /// <summary>
 /// Returns the next ")" or "," in the stream.
 /// </summary>
 /// <param name="tokenizer">tokenizer over a stream of text in Well-known Text
 /// format. The next token must be ")" or ",".</param>
 /// <returns>Returns the next ")" or "," in the stream.</returns>
 /// <remarks>
 /// ParseException is thrown if the next token is not ")" or ",".
 /// </remarks>
 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 + "'");
 }

        /// <summary>
        /// Returns the next "EMPTY" or "(" in the stream as uppercase text.
        /// </summary>
        /// <param name="tokenizer">Tokenizer over a stream of text in Well-known Text
        /// format. The next token must be "EMPTY" or "(".</param>
        /// <returns>the next "EMPTY" or "(" in the stream as uppercase
        /// text.</returns>
        /// <remarks>
        /// ParseException is thrown if the next token is not "EMPTY" or "(".
        /// </remarks>
        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 + "'");
        }

        /// <summary>
        /// Reads either 3, 6 or 7 parameter Bursa-Wolf values from TOWGS84 token
        /// </summary>
        /// <param name="tokenizer"></param>
        /// <returns></returns>
        private static Wgs84ConversionInfo ReadWGS84ConversionInfo(WktStreamTokenizer tokenizer)
        {
            //TOWGS84[0,0,0,0,0,0,0]
            tokenizer.ReadToken("[");
            Wgs84ConversionInfo info = new Wgs84ConversionInfo();
            tokenizer.NextToken();
            info.Dx = tokenizer.GetNumericValue();
            tokenizer.ReadToken(",");

            tokenizer.NextToken();
            info.Dy = tokenizer.GetNumericValue();
            tokenizer.ReadToken(",");

            tokenizer.NextToken();
            info.Dz = tokenizer.GetNumericValue();
            tokenizer.NextToken();
            if (tokenizer.GetStringValue() == ",")
            {
                tokenizer.NextToken();
                info.Ex = tokenizer.GetNumericValue();

                tokenizer.ReadToken(",");
                tokenizer.NextToken();
                info.Ey = tokenizer.GetNumericValue();

                tokenizer.ReadToken(",");
                tokenizer.NextToken();
                info.Ez = tokenizer.GetNumericValue();

                tokenizer.NextToken();
                if (tokenizer.GetStringValue() == ",")
                {
                    tokenizer.NextToken();
                    info.Ppm = tokenizer.GetNumericValue();
                }
            }
            if (tokenizer.GetStringValue() != "]")
                tokenizer.ReadToken("]");
            return info;
        }

 /// <summary>
 /// 
 /// </summary>
 /// <param name="tokenizer"></param>
 /// <returns></returns>
 private static IProjection ReadProjection(WktStreamTokenizer tokenizer)
 {
     //tokenizer.NextToken();// PROJECTION
     tokenizer.ReadToken("PROJECTION");
     tokenizer.ReadToken("[");//[
     string projectionName = tokenizer.ReadDoubleQuotedWord();
     tokenizer.ReadToken("]");//]
     tokenizer.ReadToken(",");//,
     tokenizer.ReadToken("PARAMETER");
     List<ProjectionParameter> paramList = new List<ProjectionParameter>();
     while (tokenizer.GetStringValue() == "PARAMETER")
     {
         tokenizer.ReadToken("[");
         string paramName = tokenizer.ReadDoubleQuotedWord();
         tokenizer.ReadToken(",");
         tokenizer.NextToken();
         double paramValue = tokenizer.GetNumericValue();
         tokenizer.ReadToken("]");
         tokenizer.ReadToken(",");
         paramList.Add(new ProjectionParameter(paramName, paramValue));
         tokenizer.NextToken();
     }
     string authority = String.Empty;
     long authorityCode = -1;
     IProjection projection = new Projection(projectionName, paramList, projectionName, authority, authorityCode, String.Empty, String.Empty, string.Empty);
     return projection;
 }

 /// <summary>
 /// Returns a IUnit given a piece of WKT.
 /// </summary>
 /// <param name="tokenizer">WktStreamTokenizer that has the WKT.</param>
 /// <returns>An object that implements the IUnit interface.</returns>
 private static IUnit ReadUnit(WktStreamTokenizer tokenizer)
 {
     tokenizer.ReadToken("[");
     string unitName = tokenizer.ReadDoubleQuotedWord();
     tokenizer.ReadToken(",");
     tokenizer.NextToken();
     double unitsPerUnit = tokenizer.GetNumericValue();
     string authority = String.Empty;
     long authorityCode = -1;
     tokenizer.NextToken();
     if (tokenizer.GetStringValue() == ",")
     {
         tokenizer.ReadAuthority(ref authority, ref authorityCode);
         tokenizer.ReadToken("]");
     }
     return new Unit(unitsPerUnit, unitName, authority, authorityCode, String.Empty, String.Empty, String.Empty);
 }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="tokenizer"></param>
        /// <returns></returns>
        private static IPrimeMeridian ReadPrimeMeridian(WktStreamTokenizer tokenizer)
        {
            //PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]]
            tokenizer.ReadToken("[");
            string name = tokenizer.ReadDoubleQuotedWord();
            tokenizer.ReadToken(",");
            tokenizer.NextToken();
            double longitude = tokenizer.GetNumericValue();

            tokenizer.NextToken();
            string authority = String.Empty;
            long authorityCode = -1;
            if (tokenizer.GetStringValue() == ",")
            {
                tokenizer.ReadAuthority(ref authority, ref authorityCode);
                tokenizer.ReadToken("]");
            }
            // make an assumption about the Angular units - degrees.
            IPrimeMeridian primeMeridian = new PrimeMeridian(longitude, AngularUnit.Degrees, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);

            return primeMeridian;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="tokenizer"></param>
        /// <returns></returns>
        private static IProjectedCoordinateSystem ReadProjectedCoordinateSystem(WktStreamTokenizer tokenizer)
        {
            /*PROJCS[
                "OSGB 1936 / British National Grid",
                GEOGCS[
                    "OSGB 1936",
                    DATUM[...]
                    PRIMEM[...]
                    AXIS["Geodetic latitude","NORTH"]
                    AXIS["Geodetic longitude","EAST"]
                    AUTHORITY["EPSG","4277"]
                ],
                PROJECTION["Transverse Mercator"],
                PARAMETER["latitude_of_natural_origin",49],
                PARAMETER["longitude_of_natural_origin",-2],
                PARAMETER["scale_factor_at_natural_origin",0.999601272],
                PARAMETER["false_easting",400000],
                PARAMETER["false_northing",-100000],
                AXIS["Easting","EAST"],
                AXIS["Northing","NORTH"],
                AUTHORITY["EPSG","27700"]
            ]
            */
            tokenizer.ReadToken("[");
            string name = tokenizer.ReadDoubleQuotedWord();
            tokenizer.ReadToken(",");
            tokenizer.ReadToken("GEOGCS");
            IGeographicCoordinateSystem geographicCS = ReadGeographicCoordinateSystem(tokenizer);
            tokenizer.ReadToken(",");
            IProjection projection = ReadProjection(tokenizer);
            IUnit unit = ReadLinearUnit(tokenizer);

            string authority = String.Empty;
            long authorityCode = -1;
            tokenizer.NextToken();
            List<AxisInfo> axes = new List<AxisInfo>(2);
            if (tokenizer.GetStringValue() == ",")
            {
                tokenizer.NextToken();
                while (tokenizer.GetStringValue() == "AXIS")
                {
                    axes.Add(ReadAxis(tokenizer));
                    tokenizer.NextToken();
                }
                if (tokenizer.GetStringValue() == "AUTHORITY")
                {
                    tokenizer.ReadAuthority(ref authority, ref authorityCode);
                    tokenizer.ReadToken("]");
                }
            }
            //This is default axis values if not specified.
            if (axes.Count == 0)
            {
                axes.Add(new AxisInfo("X", AxisOrientationEnum.East));
                axes.Add(new AxisInfo("Y", AxisOrientationEnum.North));
            }
            IProjectedCoordinateSystem projectedCS = new ProjectedCoordinateSystem(geographicCS.HorizontalDatum, geographicCS, unit as LinearUnit, projection, axes, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
            return projectedCS;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="tokenizer"></param>
        /// <returns></returns>
        private static IHorizontalDatum ReadHorizontalDatum(WktStreamTokenizer tokenizer)
        {
            //DATUM["OSGB 1936",SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]]TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6277"]]
            Wgs84ConversionInfo wgsInfo = null;
            string authority = String.Empty;
            long authorityCode = -1;

            tokenizer.ReadToken("[");
            string name = tokenizer.ReadDoubleQuotedWord();
            tokenizer.ReadToken(",");
            tokenizer.ReadToken("SPHEROID");
            IEllipsoid ellipsoid = ReadEllipsoid(tokenizer);
            tokenizer.NextToken();
            while (tokenizer.GetStringValue() == ",")
            {
                tokenizer.NextToken();
                if (tokenizer.GetStringValue() == "TOWGS84")
                {
                    wgsInfo = ReadWGS84ConversionInfo(tokenizer);
                    tokenizer.NextToken();
                }
                else if (tokenizer.GetStringValue() == "AUTHORITY")
                {
                    tokenizer.ReadAuthority(ref authority, ref authorityCode);
                    tokenizer.ReadToken("]");
                }
            }
            // make an assumption about the datum type.
            IHorizontalDatum horizontalDatum = new HorizontalDatum(ellipsoid, wgsInfo, DatumType.HD_Geocentric, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);

            return horizontalDatum;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="tokenizer"></param>
        /// <returns></returns>
        private static IGeographicCoordinateSystem ReadGeographicCoordinateSystem(WktStreamTokenizer tokenizer)
        {
            /*
            GEOGCS["OSGB 1936",
            DATUM["OSGB 1936",SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]]TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6277"]]
            PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]]
            AXIS["Geodetic latitude","NORTH"]
            AXIS["Geodetic longitude","EAST"]
            AUTHORITY["EPSG","4277"]
            ]
            */
            tokenizer.ReadToken("[");
            string name = tokenizer.ReadDoubleQuotedWord();
            tokenizer.ReadToken(",");
            tokenizer.ReadToken("DATUM");
            IHorizontalDatum horizontalDatum = ReadHorizontalDatum(tokenizer);
            tokenizer.ReadToken(",");
            tokenizer.ReadToken("PRIMEM");
            IPrimeMeridian primeMeridian = ReadPrimeMeridian(tokenizer);
            tokenizer.ReadToken(",");
            tokenizer.ReadToken("UNIT");
            IAngularUnit angularUnit = ReadAngularUnit(tokenizer);

            string authority = String.Empty;
            long authorityCode = -1;
            tokenizer.NextToken();
            List<AxisInfo> info = new List<AxisInfo>(2);
            if (tokenizer.GetStringValue() == ",")
            {
                tokenizer.NextToken();
                while (tokenizer.GetStringValue() == "AXIS")
                {
                    info.Add(ReadAxis(tokenizer));
                    tokenizer.NextToken();
                }
                if (tokenizer.GetStringValue() == "AUTHORITY")
                {
                    tokenizer.ReadAuthority(ref authority, ref authorityCode);
                    tokenizer.ReadToken("]");
                }
            }
            //This is default axis values if not specified.
            if (info.Count == 0)
            {
                info.Add(new AxisInfo("Lon", AxisOrientationEnum.East));
                info.Add(new AxisInfo("Lat", AxisOrientationEnum.North));
            }
            IGeographicCoordinateSystem geographicCS = new GeographicCoordinateSystem(angularUnit, horizontalDatum,
                    primeMeridian, info, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
            return geographicCS;
        }

        /*
        /// <summary>
        ///
        /// </summary>
        /// <param name="tokenizer"></param>
        /// <returns></returns>
        private static ICompoundCoordinateSystem ReadCompoundCoordinateSystem(WktStreamTokenizer tokenizer)
        {

            //COMPD_CS[
            //"OSGB36 / British National Grid + ODN",
            //PROJCS[]
            //VERT_CS[]
            //AUTHORITY["EPSG","7405"]
            //]

            tokenizer.ReadToken("[");
            string name=tokenizer.ReadDoubleQuotedWord();
            tokenizer.ReadToken(",");
            tokenizer.NextToken();
            string headCSCode =  tokenizer.GetStringValue();
            ICoordinateSystem headCS = ReadCoordinateSystem(headCSCode,tokenizer);
            tokenizer.ReadToken(",");
            tokenizer.NextToken();
            string tailCSCode =  tokenizer.GetStringValue();
            ICoordinateSystem tailCS = ReadCoordinateSystem(tailCSCode,tokenizer);
            tokenizer.ReadToken(",");
            string authority=String.Empty;
            string authorityCode=String.Empty;
            tokenizer.ReadAuthority(ref authority, ref authorityCode);
            tokenizer.ReadToken("]");
            ICompoundCoordinateSystem compoundCS = new CompoundCoordinateSystem(headCS,tailCS,String.Empty,authority,authorityCode,name,String.Empty,String.Empty);
            return compoundCS;

        }*/
        /// <summary>
        /// 
        /// </summary>
        /// <param name="tokenizer"></param>
        /// <returns></returns>
        private static IEllipsoid ReadEllipsoid(WktStreamTokenizer tokenizer)
        {
            //SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]]
            tokenizer.ReadToken("[");
            string name = tokenizer.ReadDoubleQuotedWord();
            tokenizer.ReadToken(",");
            tokenizer.NextToken();
            double majorAxis = tokenizer.GetNumericValue();
            tokenizer.ReadToken(",");
            tokenizer.NextToken();
            double e = tokenizer.GetNumericValue();
            //

            //tokenizer.ReadToken(",");
            tokenizer.NextToken();
            string authority = String.Empty;
            long authorityCode = -1;
            if (tokenizer.GetStringValue() == ",") //Read authority
            {
                tokenizer.ReadAuthority(ref authority, ref authorityCode);
                tokenizer.ReadToken("]");
            }
            IEllipsoid ellipsoid = new Ellipsoid(majorAxis, 0.0, e, true, LinearUnit.Metre, name, authority, authorityCode, String.Empty, string.Empty, string.Empty);
            return ellipsoid;
        }

 /// <summary>
 /// 
 /// </summary>
 /// <param name="coordinateSystem"></param>
 /// <param name="tokenizer"></param>
 /// <returns></returns>
 private static ICoordinateSystem ReadCoordinateSystem(string coordinateSystem, WktStreamTokenizer tokenizer)
 {
     switch (tokenizer.GetStringValue())
     {
         case "GEOGCS":
             return ReadGeographicCoordinateSystem(tokenizer);
         case "PROJCS":
             return ReadProjectedCoordinateSystem(tokenizer);
         case "COMPD_CS":
         /*	ICompoundCoordinateSystem compoundCS = ReadCompoundCoordinateSystem(tokenizer);
             returnCS = compoundCS;
             break;*/
         case "VERT_CS":
         /*	IVerticalCoordinateSystem verticalCS = ReadVerticalCoordinateSystem(tokenizer);
             returnCS = verticalCS;
             break;*/
         case "GEOCCS":
         case "FITTED_CS":
         case "LOCAL_CS":
             throw new NotSupportedException(String.Format("{0} coordinate system is not supported.", coordinateSystem));
         default:
             throw new InvalidOperationException(String.Format("{0} coordinate system is not recognized.", coordinateSystem));
     }
 }

 /// <summary>
 /// Returns a <see cref="AxisInfo"/> given a piece of WKT.
 /// </summary>
 /// <param name="tokenizer">WktStreamTokenizer that has the WKT.</param>
 /// <returns>An AxisInfo object.</returns>
 private static AxisInfo ReadAxis(WktStreamTokenizer tokenizer)
 {
     if (tokenizer.GetStringValue() != "AXIS")
         tokenizer.ReadToken("AXIS");
     tokenizer.ReadToken("[");
     string axisName = tokenizer.ReadDoubleQuotedWord();
     tokenizer.ReadToken(",");
     tokenizer.NextToken();
     string unitname = tokenizer.GetStringValue();
     tokenizer.ReadToken("]");
     switch (unitname.ToUpper())
     {
         case "DOWN": return new AxisInfo(axisName, AxisOrientationEnum.Down);
         case "EAST": return new AxisInfo(axisName, AxisOrientationEnum.East);
         case "NORTH": return new AxisInfo(axisName, AxisOrientationEnum.North);
         case "OTHER": return new AxisInfo(axisName, AxisOrientationEnum.Other);
         case "SOUTH": return new AxisInfo(axisName, AxisOrientationEnum.South);
         case "UP": return new AxisInfo(axisName, AxisOrientationEnum.Up);
         case "WEST": return new AxisInfo(axisName, AxisOrientationEnum.West);
         default:
             throw new ArgumentException("Invalid axis name '" + unitname + "' in WKT");
     }
 }