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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
{
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Text;
using System.Xml;
internal static partial class UriUtil
{
internal static string GetNameFromAtomLinkRelationAttribute(string value)
{
string name = null;
if (!String.IsNullOrEmpty(value))
{
Uri uri = null;
try
{
uri = new Uri(value, UriKind.RelativeOrAbsolute);
}
catch (UriFormatException)
{ }
if ((null != uri) && uri.IsAbsoluteUri)
{
string unescaped = uri.GetComponents(UriComponents.AbsoluteUri, UriFormat.SafeUnescaped);
if (unescaped.StartsWith(XmlConstants.DataWebRelatedNamespace, StringComparison.Ordinal))
{
name = unescaped.Substring(XmlConstants.DataWebRelatedNamespace.Length);
}
}
}
return name;
}
}
internal static partial class XmlUtil
{
private static NameTable CreateAtomNameTable()
{
NameTable table = new NameTable();
table.Add(XmlConstants.AtomNamespace);
table.Add(XmlConstants.DataWebNamespace);
table.Add(XmlConstants.DataWebMetadataNamespace);
table.Add(XmlConstants.AtomContentElementName);
table.Add(XmlConstants.AtomContentSrcAttributeName);
table.Add(XmlConstants.AtomEntryElementName);
table.Add(XmlConstants.AtomETagAttributeName);
table.Add(XmlConstants.AtomFeedElementName);
table.Add(XmlConstants.AtomIdElementName);
table.Add(XmlConstants.AtomInlineElementName);
table.Add(XmlConstants.AtomLinkElementName);
table.Add(XmlConstants.AtomLinkRelationAttributeName);
table.Add(XmlConstants.AtomNullAttributeName);
table.Add(XmlConstants.AtomPropertiesElementName);
table.Add(XmlConstants.AtomTitleElementName);
table.Add(XmlConstants.AtomTypeAttributeName);
table.Add(XmlConstants.XmlErrorCodeElementName);
table.Add(XmlConstants.XmlErrorElementName);
table.Add(XmlConstants.XmlErrorInnerElementName);
table.Add(XmlConstants.XmlErrorMessageElementName);
table.Add(XmlConstants.XmlErrorTypeElementName);
return table;
}
internal static XmlReader CreateXmlReader(Stream stream, Encoding encoding)
{
Debug.Assert(null != stream, "null stream");
XmlReaderSettings settings = new XmlReaderSettings();
settings.CheckCharacters = false;
settings.CloseInput = true;
settings.IgnoreWhitespace = true;
settings.NameTable = XmlUtil.CreateAtomNameTable();
if (null == encoding)
{ return XmlReader.Create(stream, settings);
}
return XmlReader.Create(new StreamReader(stream, encoding), settings);
}
internal static XmlWriterSettings CreateXmlWriterSettings(Encoding encoding)
{
Debug.Assert(null != encoding, "null != encoding");
XmlWriterSettings settings = new XmlWriterSettings();
settings.CheckCharacters = false;
settings.ConformanceLevel = ConformanceLevel.Fragment;
settings.Encoding = encoding;
settings.Indent = true;
settings.NewLineHandling = NewLineHandling.Entitize;
Debug.Assert(!settings.CloseOutput, "!settings.CloseOutput -- otherwise default changed?");
return settings;
}
internal static XmlWriter CreateXmlWriterAndWriteProcessingInstruction(Stream stream, Encoding encoding)
{
Debug.Assert(null != stream, "null != stream");
Debug.Assert(null != encoding, "null != encoding");
XmlWriterSettings settings = CreateXmlWriterSettings(encoding);
XmlWriter writer = XmlWriter.Create(stream, settings);
writer.WriteProcessingInstruction("xml", "version=\"1.0\" encoding=\"" + encoding.WebName + "\" standalone=\"yes\"");
return writer;
}
internal static string GetAttributeEx(this XmlReader reader, string attributeName, string namespaceUri)
{
return reader.GetAttribute(attributeName, namespaceUri) ?? reader.GetAttribute(attributeName);
}
internal static void RemoveDuplicateNamespaceAttributes(System.Xml.Linq.XElement element)
{
Debug.Assert(element != null, "element != null");
HashSet<string> names = new HashSet<string>(EqualityComparer<string>.Default);
foreach (System.Xml.Linq.XElement e in element.DescendantsAndSelf())
{
bool attributesFound = false;
foreach (var attribute in e.Attributes())
{
if (!attributesFound)
{
attributesFound = true;
names.Clear();
}
if (attribute.IsNamespaceDeclaration)
{
string localName = attribute.Name.LocalName;
bool alreadyPresent = names.Add(localName) == false;
if (alreadyPresent)
{
attribute.Remove();
}
}
}
}
}
}
}
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