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 using System.Collections;
  32 using System.Collections.Specialized;
  33 using System.Text;
  34 using System.Xml.XPath;
  35 using System.Xml;
  36
  37 namespace System.Web.UI
  38 {
  39         public sealed class XPathBinder
  40         {
  41                 XPathBinder ()
  42                 {
  43                 }
  44
  45                 public static object Eval (object container, string xpath)
  46                 {
  47                         return Eval (container, xpath, (IXmlNamespaceResolver)null);
  48                 }
  49
  50                 public static object Eval (object container, string xpath, IXmlNamespaceResolver resolver)
  51                 {
  52                         if (xpath == null || xpath.Length == 0)
  53                                 throw new ArgumentNullException ("xpath");
  54
  55                         IXPathNavigable factory = container as IXPathNavigable;
  56
  57                         if (factory == null)
  58                                 throw new ArgumentException ("container");
  59
  60                         object result = factory.CreateNavigator ().Evaluate (xpath, resolver);
  61
  62                         XPathNodeIterator itr = result as XPathNodeIterator;
  63                         if (itr != null) {
  64                                 if (itr.MoveNext ())
  65                                         return itr.Current.Value;
  66                                 else
  67                                         return null;
  68                         }
  69
  70                         return result;
  71                 }
  72
  73                 public static string Eval (object container, string xpath, string format)
  74                 {
  75                         return Eval (container, xpath, format, null);
  76                 }
  77
  78                 public static string Eval (object container, string xpath, string format, IXmlNamespaceResolver resolver)
  79                 {
  80                         object result = Eval (container, xpath, resolver);
  81
  82                         if (result == null)
  83                                 return String.Empty;
  84                         if (format == null || format.Length == 0)
  85                                 return result.ToString ();
  86
  87                         return String.Format (format, result);
  88                 }
  89
  90                 public static IEnumerable Select (object container, string xpath)
  91                 {
  92                         return Select (container, xpath, null);
  93                 }
  94
  95                 public static IEnumerable Select (object container, string xpath, IXmlNamespaceResolver resolver)
  96                 {
  97                         if (xpath == null || xpath.Length == 0)
  98                                 throw new ArgumentNullException ("xpath");
  99
 100                         IXPathNavigable factory = container as IXPathNavigable;
 101
 102                         if (factory == null)
 103                                 throw new ArgumentException ("container");
 104
 105                         XPathNodeIterator itr = factory.CreateNavigator ().Select (xpath, resolver);
 106                         ArrayList ret = new ArrayList ();
 107
 108                         while (itr.MoveNext ()) {
 109                                 IHasXmlNode nodeAccessor = itr.Current as IHasXmlNode;
 110                                 if (nodeAccessor == null)
 111                                         throw new InvalidOperationException ();
 112                                 ret.Add (nodeAccessor.GetNode ());
 113                         }
 114                         return ret;
 115                 }
 116
 117         }
 118 }
 119