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//Copyright 2010 Microsoft Corporation
//
//Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//
//http://www.apache.org/licenses/LICENSE-2.0
//
//Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
//"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and limitations under the License.
namespace System.Data.Services.Client.Xml
{
#region Namespaces.
using System.Diagnostics;
using System.Xml;
#endregion Namespaces.
[DebuggerDisplay("XmlAtomErrorReader {NodeType} {Name} {Value}")]
internal class XmlAtomErrorReader : XmlWrappingReader
{
internal XmlAtomErrorReader(XmlReader baseReader) : base(baseReader)
{
Debug.Assert(baseReader != null, "baseReader != null");
this.Reader = baseReader;
}
#region Methods.
public override bool Read()
{
bool result = base.Read();
if (this.NodeType == XmlNodeType.Element &&
Util.AreSame(this.Reader, XmlConstants.XmlErrorElementName, XmlConstants.DataWebMetadataNamespace))
{
string message = ReadErrorMessage(this.Reader);
throw new DataServiceClientException(Strings.Deserialize_ServerException(message));
}
return result;
}
internal static string ReadElementString(XmlReader reader, bool checkNullAttribute)
{
Debug.Assert(reader != null, "reader != null");
Debug.Assert(XmlNodeType.Element == reader.NodeType, "not positioned on Element");
string result = null;
bool empty = checkNullAttribute && !Util.DoesNullAttributeSayTrue(reader);
if (reader.IsEmptyElement)
{
return (empty ? String.Empty : null);
}
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.EndElement:
return result ?? (empty ? String.Empty : null);
case XmlNodeType.CDATA:
case XmlNodeType.Text:
case XmlNodeType.SignificantWhitespace:
if (null != result)
{
throw Error.InvalidOperation(Strings.Deserialize_MixedTextWithComment);
}
result = reader.Value;
break;
case XmlNodeType.Comment:
case XmlNodeType.Whitespace:
break;
case XmlNodeType.Element:
default:
throw Error.InvalidOperation(Strings.Deserialize_ExpectingSimpleValue);
}
}
throw Error.InvalidOperation(Strings.Deserialize_ExpectingSimpleValue);
}
private static string ReadErrorMessage(XmlReader reader)
{
Debug.Assert(reader != null, "reader != null");
Debug.Assert(reader.NodeType == XmlNodeType.Element, "reader.NodeType == XmlNodeType.Element");
Debug.Assert(reader.LocalName == XmlConstants.XmlErrorElementName, "reader.LocalName == XmlConstants.XmlErrorElementName");
int depth = 1;
while (depth > 0 && reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
if (!reader.IsEmptyElement)
{
depth++;
}
if (depth == 2 &&
Util.AreSame(reader, XmlConstants.XmlErrorMessageElementName, XmlConstants.DataWebMetadataNamespace))
{
return ReadElementString(reader, false);
}
}
else if (reader.NodeType == XmlNodeType.EndElement)
{
depth--;
}
}
return String.Empty;
}
#endregion Methods.
}
}
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