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//------------------------------------------------------------------------------
// <copyright file="XmlPreloadedResolver.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
using System.IO;
using System.Xml;
using System.Threading.Tasks;
namespace System.Xml.Resolvers {
//
// XmlPreloadedResolver is an XmlResolver that which can be pre-loaded with data.
// By default it contains well-known DTDs for XHTML 1.0 and RSS 0.91.
// Custom mappings of URIs to data can be added with the Add method.
//
public partial class XmlPreloadedResolver : XmlResolver {
public override Task<Object> GetEntityAsync(Uri absoluteUri,
string role,
Type ofObjectToReturn) {
if (absoluteUri == null) {
throw new ArgumentNullException("absoluteUri");
}
PreloadedData data;
if (!mappings.TryGetValue(absoluteUri, out data)) {
if (fallbackResolver != null) {
return fallbackResolver.GetEntityAsync(absoluteUri, role, ofObjectToReturn);
}
throw new XmlException(Res.GetString(Res.Xml_CannotResolveUrl, absoluteUri.ToString()));
}
if (ofObjectToReturn == null || ofObjectToReturn == typeof(Stream) || ofObjectToReturn == typeof(Object)) {
return Task.FromResult<Object>(data.AsStream());
}
else if (ofObjectToReturn == typeof(TextReader)) {
return Task.FromResult<Object>(data.AsTextReader());
}
else {
throw new XmlException(Res.GetString(Res.Xml_UnsupportedClass));
}
}
}
}
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