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//
// System.Web.UI.XPathBinder
//
// Authors:
// Ben Maurer (bmaurer@users.sourceforge.net)
//
// (C) 2003 Ben Maurer
//
#if NET_2_0
using System.Collections;
using System.Collections.Specialized;
using System.Text;
using System.Xml.XPath;
using System.Xml;
namespace System.Web.UI {
public sealed class XPathBinder {
private XPathBinder ()
{
}
public static object Eval (object container, string xpath)
{
if (xpath == null || xpath.Length == 0)
throw new ArgumentNullException ("xpath");
IXPathNavigable factory = container as IXPathNavigable;
if (factory == null)
throw new ArgumentException ("container");
object result = factory.CreateNavigator ().Evaluate (xpath);
XPathNodeIterator itr = result as XPathNodeIterator;
if (itr != null) {
if (itr.MoveNext())
return itr.Current.Value;
else
return null;
}
return result;
}
public static string Eval (object container, string xpath, string format)
{
object result = Eval (container, xpath);
if (result == null)
return String.Empty;
if (format == null || format.Length == 0)
return result.ToString ();
return String.Format (format, result);
}
public static IEnumerable Select (object container, string xpath)
{
if (xpath == null || xpath.Length == 0)
throw new ArgumentNullException ("xpath");
IXPathNavigable factory = container as IXPathNavigable;
if (factory == null)
throw new ArgumentException ("container");
XPathNodeIterator itr = factory.CreateNavigator ().Select (xpath);
ArrayList ret = new ArrayList ();
while (itr.MoveNext ()) {
IHasXmlNode nodeAccessor = itr.Current as IHasXmlNode;
if (nodeAccessor == null)
throw new InvalidOperationException ();
ret.Add (nodeAccessor.GetNode ());
}
return ret;
}
}
}
#endif
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