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                         return Eval (container, xpath, (IXmlNamespaceResolver)null);
  47                 }
  48
  49                 public static object Eval (object container, string xpath, IXmlNamespaceResolver resolver)
  50                 {
  51                         if (xpath == null || xpath.Length == 0)
  52                                 throw new ArgumentNullException ("xpath");
  53
  54                         IXPathNavigable factory = container as IXPathNavigable;
  55
  56                         if (factory == null)
  57                                 throw new ArgumentException ("container");
  58
  59                         object result = factory.CreateNavigator ().Evaluate (xpath, resolver);
  60
  61                         XPathNodeIterator itr = result as XPathNodeIterator;
  62                         if (itr != null) {
  63                                 if (itr.MoveNext ())
  64                                         return itr.Current.Value;
  65                                 else
  66                                         return null;
  67                         }
  68
  69                         return result;
  70                 }
  71
  72                 public static string Eval (object container, string xpath, string format)
  73                 {
  74                         return Eval (container, xpath, format, null);
  75                 }
  76
  77                 public static string Eval (object container, string xpath, string format, IXmlNamespaceResolver resolver)
  78                 {
  79                         object result = Eval (container, xpath, (IXmlNamespaceResolver)null);
  80
  81                         if (result == null)
  82                                 return String.Empty;
  83                         if (format == null || format.Length == 0)
  84                                 return result.ToString ();
  85
  86                         return String.Format (format, result);
  87                 }
  88
  89                 public static IEnumerable Select (object container, string xpath)
  90                 {
  91                         return Select (container, xpath, null);
  92                 }
  93
  94                 public static IEnumerable Select (object container, string xpath, IXmlNamespaceResolver resolver)
  95                 {
  96                         if (xpath == null || xpath.Length == 0)
  97                                 throw new ArgumentNullException ("xpath");
  98
  99                         IXPathNavigable factory = container as IXPathNavigable;
 100
 101                         if (factory == null)
 102                                 throw new ArgumentException ("container");
 103
 104                         XPathNodeIterator itr = factory.CreateNavigator ().Select (xpath, resolver);
 105                         ArrayList ret = new ArrayList ();
 106
 107                         while (itr.MoveNext ()) {
 108                                 IHasXmlNode nodeAccessor = itr.Current as IHasXmlNode;
 109                                 if (nodeAccessor == null)
 110                                         throw new InvalidOperationException ();
 111                                 ret.Add (nodeAccessor.GetNode ());
 112                         }
 113                         return ret;
 114                 }
 115
 116         }
 117 }
 118 #endif
 119