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+// System.Xml.XmlUrlResolver.cs
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+//
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+// Author: Duncan Mak ([email protected])
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+// Atsushi Enomoto ([email protected])
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+//
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+// (C) Ximian, Inc.
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+//
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+
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+//
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+// Permission is hereby granted, free of charge, to any person obtaining
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+// a copy of this software and associated documentation files (the
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+// "Software"), to deal in the Software without restriction, including
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+// without limitation the rights to use, copy, modify, merge, publish,
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+// distribute, sublicense, and/or sell copies of the Software, and to
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+// permit persons to whom the Software is furnished to do so, subject to
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+// the following conditions:
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+//
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+// The above copyright notice and this permission notice shall be
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+// included in all copies or substantial portions of the Software.
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+//
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+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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+//
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+
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+using System.Net;
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+using System.IO;
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+using System.Text;
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+
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+namespace System.Xml
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+{
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+ public class XmlUrlResolver : XmlResolver
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+ {
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+ // Constructor
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+ public XmlUrlResolver ()
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+ : base ()
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+ {
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+ }
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+
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+ // Methods
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+ public override object GetEntity (Uri absoluteUri, string role, Type ofObjectToReturn)
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+ {
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+ if (ofObjectToReturn == null)
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+ ofObjectToReturn = typeof (Stream);
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+ if (ofObjectToReturn != typeof (Stream))
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+ throw new XmlException ("This object type is not supported.");
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+
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+ if (!absoluteUri.IsAbsoluteUri)
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+ throw new ArgumentException ("uri must be absolute.", "absoluteUri");
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+
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+ if (absoluteUri.Scheme == "file") {
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+ if (absoluteUri.AbsolutePath == String.Empty)
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+ throw new ArgumentException ("uri must be absolute.", "absoluteUri");
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+ return new FileStream (UnescapeRelativeUriBody (absoluteUri.LocalPath), FileMode.Open, FileAccess.Read, FileShare.Read);
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+ }
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+
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+ // (MS documentation says) parameter role isn't used yet.
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+ //WebRequest req = WebRequest.Create (absoluteUri);
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+ //return req.GetResponse().GetResponseStream();
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+
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+ return "";
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+ }
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+
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+ public override Uri ResolveUri (Uri baseUri, string relativeUri)
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+ {
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+ return base.ResolveUri (baseUri, relativeUri);
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+ }
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+
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+ // see also XmlResolver.EscapeRelativeUriBody().
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+ private string UnescapeRelativeUriBody (string src)
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+ {
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+ return src.Replace ("%3C", "<")
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+ .Replace ("%3E", ">")
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+ .Replace ("%23", "#")
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+ .Replace ("%22", "\"")
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+ .Replace ("%20", " ")
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+ .Replace ("%25", "%");
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+ }
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+ }
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+}
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