mcs/class/System.Web/System.Web.UI/XPathBinder.cs

   1 //
   2 // System.Web.UI.XPathBinder
   3 //
   4 // Authors:
   5 //      Ben Maurer (bmaurer@users.sourceforge.net)
   6 //
   7 // (C) 2003 Ben Maurer
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 #if NET_2_0
  32 using System.Collections;
  33 using System.Collections.Specialized;
  34 using System.Text;
  35 using System.Xml.XPath;
  36 using System.Xml;
  37
  38 namespace System.Web.UI {
  39         public sealed class XPathBinder {
  40                 private XPathBinder ()
  41                 {
  42                 }
  43
  44                 public static object Eval (object container, string xpath)
  45                 {
  46                         if (xpath == null || xpath.Length == 0)
  47                                 throw new ArgumentNullException ("xpath");
  48
  49                         IXPathNavigable factory = container as IXPathNavigable;
  50
  51                         if (factory == null)
  52                                 throw new ArgumentException ("container");
  53
  54                         object result = factory.CreateNavigator ().Evaluate (xpath);
  55
  56                         XPathNodeIterator itr = result as XPathNodeIterator;
  57                         if (itr != null) {
  58                                 if (itr.MoveNext())
  59                                         return itr.Current.Value;
  60                                 else
  61                                         return null;
  62                         }
  63                         return result;
  64                 }
  65
  66                 public static string Eval (object container, string xpath, string format)
  67                 {
  68                         object result = Eval (container, xpath);
  69
  70                         if (result == null)
  71                                 return String.Empty;
  72                         if (format == null || format.Length == 0)
  73                                 return result.ToString ();
  74
  75                         return String.Format (format, result);
  76                 }
  77
  78                 public static IEnumerable Select (object container, string xpath)
  79                 {
  80                         if (xpath == null || xpath.Length == 0)
  81                                 throw new ArgumentNullException ("xpath");
  82
  83                         IXPathNavigable factory = container as IXPathNavigable;
  84
  85                         if (factory == null)
  86                                 throw new ArgumentException ("container");
  87
  88                         XPathNodeIterator itr = factory.CreateNavigator ().Select (xpath);
  89                         ArrayList ret = new ArrayList ();
  90
  91                         while (itr.MoveNext ()) {
  92                                 IHasXmlNode nodeAccessor = itr.Current as IHasXmlNode;
  93                                 if (nodeAccessor == null)
  94                                         throw new InvalidOperationException ();
  95                                 ret.Add (nodeAccessor.GetNode ());
  96                         }
  97                         return ret;
  98                 }
  99
 100         }
 101 }
 102 #endif
 103