WKTStreamTokenizer.cs
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- // Copyright 2005, 2006 - Morten Nielsen (www.iter.dk)
- //
- // This file is part of SharpMap.
- // SharpMap is free software; you can redistribute it and/or modify
- // it under the terms of the GNU Lesser General Public License as published by
- // the Free Software Foundation; either version 2 of the License, or
- // (at your option) any later version.
- //
- // SharpMap is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU Lesser General Public License for more details.
- // You should have received a copy of the GNU Lesser General Public License
- // along with SharpMap; if not, write to the Free Software
- // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- // SOURCECODE IS MODIFIED FROM ANOTHER WORK AND IS ORIGINALLY BASED ON GeoTools.NET:
- /*
- * Copyright (C) 2002 Urban Science Applications, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
- #region Using
- using System;
- using System.IO;
- using SharpMap.Converters.WellKnownText.IO;
- #endregion
- namespace SharpMap.Converters.WellKnownText
- {
- /// <summary>
- /// Reads a stream of Well Known Text (wkt) string and returns a stream of tokens.
- /// </summary>
- internal class WktStreamTokenizer : StreamTokenizer
- {
- #region Constructors
- /// <summary>
- /// Initializes a new instance of the WktStreamTokenizer class.
- /// </summary>
- /// <remarks>The WktStreamTokenizer class ais in reading WKT streams.</remarks>
- /// <param name="reader">A TextReader that contains </param>
- public WktStreamTokenizer(TextReader reader) : base(reader, true)
- {
- if (reader==null)
- {
- throw new ArgumentNullException("reader");
- }
- }
- #endregion
- #region Methods
- /// <summary>
- /// Reads a token and checks it is what is expected.
- /// </summary>
- /// <param name="expectedToken">The expected token.</param>
- internal void ReadToken(string expectedToken)
- {
- this.NextToken();
- if (this.GetStringValue()!=expectedToken)
- {
- throw new Exception(String.Format(SharpMap.Map.numberFormat_EnUS, "Expecting ('{3}') but got a '{0}' at line {1} column {2}.", this.GetStringValue(), this.LineNumber, this.Column, expectedToken));
- }
- }
-
- /// <summary>
- /// Reads a string inside double quotes.
- /// </summary>
- /// <remarks>
- /// White space inside quotes is preserved.
- /// </remarks>
- /// <returns>The string inside the double quotes.</returns>
- public string ReadDoubleQuotedWord()
- {
- string word="";
- ReadToken(""");
- NextToken(false);
- while (GetStringValue()!=""")
- {
- word = word+ this.GetStringValue();
- NextToken(false);
- }
- return word;
- }
- /// <summary>
- /// Reads the authority and authority code.
- /// </summary>
- /// <param name="authority">String to place the authority in.</param>
- /// <param name="authorityCode">String to place the authority code in.</param>
- public void ReadAuthority(ref string authority,ref long authorityCode)
- {
- //AUTHORITY["EPGS","9102"]]
- if(GetStringValue() != "AUTHORITY")
- ReadToken("AUTHORITY");
- ReadToken("[");
- authority = this.ReadDoubleQuotedWord();
- ReadToken(",");
- long.TryParse(this.ReadDoubleQuotedWord(),out authorityCode);
- ReadToken("]");
- }
- #endregion
- }
- }