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XPath.cs

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00001 
00002 //
00003 // XML storage classes version 1.5
00004 //
00005 // XPath.cs
00006 //
00007 // Copyright (c) 2010 Martin Fuchs <martin-fuchs@gmx.net>
00008 //
00009 
00010 
00011 /*
00012 
00013  All rights reserved.
00014 
00015  Redistribution and use in source and binary forms, with or without
00016  modification, are permitted provided that the following conditions are met:
00017 
00018  * Redistributions of source code must retain the above copyright
00019     notice, this list of conditions and the following disclaimer.
00020  * Redistributions in binary form must reproduce the above copyright
00021     notice, this list of conditions and the following disclaimer in
00022     the documentation and/or other materials provided with the
00023     distribution.
00024 
00025  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00026  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00027  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00028  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
00029  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00030  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00031  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00032  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00033  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00034  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00035  POSSIBILITY OF SUCH DAMAGE.
00036 
00037 */
00038 
00039 using System.IO;
00040 using System.Collections.Generic;
00041 
00042 namespace XMLStorage {
00043 
00044 public class XPath : LinkedList<XPathElement>
00045 {
00046     public bool _absolute;
00047     
00048     public XPath()
00049     {
00050         _absolute = false;
00051     }
00052 
00053     public XPath(string path)
00054     {
00055         _absolute = init(path);
00056     }
00057 
00058     private bool init(string path)
00059     {
00060         bool absolute;
00061         int idx = 0;
00062 
00063          // Is this an absolute path?
00064         if (path.Length>0 && path[0]=='/') {
00065             absolute = true;
00066 
00067             ++idx;
00068         } else
00069             absolute = false;
00070 
00071          // parse path
00072         while(idx < path.Length) {
00073             XPathElement elem = new XPathElement();
00074 
00075             idx = elem.parse(path, idx);
00076 
00077             if (idx == -1)
00078                 break;
00079 
00080             AddLast(elem);
00081 
00082             if (idx >= path.Length)
00083                 break;
00084 
00085             if (path[idx] == '/')
00086                 ++idx;
00087         }
00088 
00089         return absolute;
00090     }
00091 }
00092 
00093 } // namespace XMLStorage

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