mcs/class/System.Web/System.Web.UI.WebControls/XmlDataSourceView.cs

   1 //
   2 // System.Web.UI.WebControls.XmlDataSourceView
   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;
  35
  36 namespace System.Web.UI.WebControls
  37 {
  38         public sealed class XmlDataSourceView : DataSourceView
  39         {
  40                 ArrayList nodes;
  41                 XmlDataSource owner;
  42
  43                 public XmlDataSourceView (XmlDataSource owner, string name)
  44                         : base (owner, name)
  45                 {
  46                         this.owner = owner;
  47                 }
  48
  49                 public IEnumerable Select (DataSourceSelectArguments arguments)
  50                 {
  51                         return ExecuteSelect (arguments);
  52                 }
  53
  54                 void DoXPathSelect ()
  55                 {
  56                         XmlNodeList selected_nodes = owner.GetXmlDocument ().SelectNodes (owner.XPath != "" ? owner.XPath : "/*/*");
  57
  58                         nodes = new ArrayList (selected_nodes.Count);
  59
  60                         foreach (XmlNode node in selected_nodes) {
  61                                 if (node.NodeType == XmlNodeType.Element)
  62                                         nodes.Add (node);
  63                         }
  64                 }
  65
  66                 protected internal override IEnumerable ExecuteSelect (DataSourceSelectArguments arguments)
  67                 {
  68                         if (nodes == null)
  69                                 DoXPathSelect();
  70
  71                         ArrayList list = new ArrayList ();
  72                         int max = arguments.StartRowIndex + (arguments.MaximumRows > 0 ? arguments.MaximumRows : nodes.Count);
  73                         if (max > nodes.Count) max = nodes.Count;
  74
  75                         for (int n = arguments.StartRowIndex; n < max; n++)
  76                                 list.Add (new XmlDataSourceNodeDescriptor ((XmlElement) nodes [n]));
  77
  78                         if (arguments.RetrieveTotalRowCount)
  79                                 arguments.TotalRowCount = nodes.Count;
  80
  81                         return list;
  82                 }
  83         }
  84 }
  85