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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.ServiceModel.Syndication
{
using System.IO;
using System.Runtime;
using System.Runtime.Serialization;
using System.Xml;
using System.Xml.Serialization;
using System.Runtime.CompilerServices;
[TypeForwardedFrom("System.ServiceModel.Web, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35")]
public class SyndicationElementExtension
{
XmlBuffer buffer;
int bufferElementIndex;
// extensionData and extensionDataWriter are only present on the send side
object extensionData;
ExtensionDataWriter extensionDataWriter;
string outerName;
string outerNamespace;
public SyndicationElementExtension(XmlReader xmlReader)
{
if (xmlReader == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("xmlReader");
}
SyndicationFeedFormatter.MoveToStartElement(xmlReader);
this.outerName = xmlReader.LocalName;
this.outerNamespace = xmlReader.NamespaceURI;
this.buffer = new XmlBuffer(int.MaxValue);
using (XmlDictionaryWriter writer = this.buffer.OpenSection(XmlDictionaryReaderQuotas.Max))
{
writer.WriteStartElement(Rss20Constants.ExtensionWrapperTag);
writer.WriteNode(xmlReader, false);
writer.WriteEndElement();
}
buffer.CloseSection();
buffer.Close();
this.bufferElementIndex = 0;
}
public SyndicationElementExtension(object dataContractExtension)
: this(dataContractExtension, (XmlObjectSerializer) null)
{
}
public SyndicationElementExtension(object dataContractExtension, XmlObjectSerializer dataContractSerializer)
: this(null, null, dataContractExtension, dataContractSerializer)
{
}
public SyndicationElementExtension(string outerName, string outerNamespace, object dataContractExtension)
: this(outerName, outerNamespace, dataContractExtension, null)
{
}
public SyndicationElementExtension(string outerName, string outerNamespace, object dataContractExtension, XmlObjectSerializer dataContractSerializer)
{
if (dataContractExtension == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("dataContractExtension");
}
if (outerName == string.Empty)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.OuterNameOfElementExtensionEmpty));
}
if (dataContractSerializer == null)
{
dataContractSerializer = new DataContractSerializer(dataContractExtension.GetType());
}
this.outerName = outerName;
this.outerNamespace = outerNamespace;
this.extensionData = dataContractExtension;
this.extensionDataWriter = new ExtensionDataWriter(this.extensionData, dataContractSerializer, this.outerName, this.outerNamespace);
}
public SyndicationElementExtension(object xmlSerializerExtension, XmlSerializer serializer)
{
if (xmlSerializerExtension == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("xmlSerializerExtension");
}
if (serializer == null)
{
serializer = new XmlSerializer(xmlSerializerExtension.GetType());
}
this.extensionData = xmlSerializerExtension;
this.extensionDataWriter = new ExtensionDataWriter(this.extensionData, serializer);
}
internal SyndicationElementExtension(XmlBuffer buffer, int bufferElementIndex, string outerName, string outerNamespace)
{
this.buffer = buffer;
this.bufferElementIndex = bufferElementIndex;
this.outerName = outerName;
this.outerNamespace = outerNamespace;
}
public string OuterName
{
get
{
if (this.outerName == null)
{
EnsureOuterNameAndNs();
}
return this.outerName;
}
}
public string OuterNamespace
{
get
{
if (this.outerName == null)
{
EnsureOuterNameAndNs();
}
return this.outerNamespace;
}
}
public TExtension GetObject<TExtension>()
{
return GetObject<TExtension>(new DataContractSerializer(typeof(TExtension)));
}
public TExtension GetObject<TExtension>(XmlObjectSerializer serializer)
{
if (serializer == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("serializer");
}
if (this.extensionData != null && typeof(TExtension).IsAssignableFrom(extensionData.GetType()))
{
return (TExtension) this.extensionData;
}
using (XmlReader reader = GetReader())
{
return (TExtension) serializer.ReadObject(reader, false);
}
}
public TExtension GetObject<TExtension>(XmlSerializer serializer)
{
if (serializer == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("serializer");
}
if (this.extensionData != null && typeof(TExtension).IsAssignableFrom(extensionData.GetType()))
{
return (TExtension) this.extensionData;
}
using (XmlReader reader = GetReader())
{
return (TExtension) serializer.Deserialize(reader);
}
}
public XmlReader GetReader()
{
this.EnsureBuffer();
XmlReader reader = this.buffer.GetReader(0);
int index = 0;
reader.ReadStartElement(Rss20Constants.ExtensionWrapperTag);
while (reader.IsStartElement())
{
if (index == this.bufferElementIndex)
{
break;
}
++index;
reader.Skip();
}
return reader;
}
public void WriteTo(XmlWriter writer)
{
if (writer == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("writer");
}
if (this.extensionDataWriter != null)
{
this.extensionDataWriter.WriteTo(writer);
}
else
{
using (XmlReader reader = GetReader())
{
writer.WriteNode(reader, false);
}
}
}
void EnsureBuffer()
{
if (this.buffer == null)
{
this.buffer = new XmlBuffer(int.MaxValue);
using (XmlDictionaryWriter writer = this.buffer.OpenSection(XmlDictionaryReaderQuotas.Max))
{
writer.WriteStartElement(Rss20Constants.ExtensionWrapperTag);
this.WriteTo(writer);
writer.WriteEndElement();
}
buffer.CloseSection();
buffer.Close();
this.bufferElementIndex = 0;
}
}
void EnsureOuterNameAndNs()
{
Fx.Assert(this.extensionDataWriter != null, "outer name is null only for datacontract and xmlserializer cases");
this.extensionDataWriter.ComputeOuterNameAndNs(out this.outerName, out this.outerNamespace);
}
// this class holds the extension data and the associated serializer (either DataContractSerializer or XmlSerializer but not both)
class ExtensionDataWriter
{
readonly XmlObjectSerializer dataContractSerializer;
readonly object extensionData;
readonly string outerName;
readonly string outerNamespace;
readonly XmlSerializer xmlSerializer;
public ExtensionDataWriter(object extensionData, XmlObjectSerializer dataContractSerializer, string outerName, string outerNamespace)
{
Fx.Assert(extensionData != null && dataContractSerializer != null, "null check");
this.dataContractSerializer = dataContractSerializer;
this.extensionData = extensionData;
this.outerName = outerName;
this.outerNamespace = outerNamespace;
}
public ExtensionDataWriter(object extensionData, XmlSerializer serializer)
{
Fx.Assert(extensionData != null && serializer != null, "null check");
this.xmlSerializer = serializer;
this.extensionData = extensionData;
}
public void WriteTo(XmlWriter writer)
{
if (this.xmlSerializer != null)
{
Fx.Assert((this.dataContractSerializer == null && this.outerName == null && this.outerNamespace == null), "Xml serializer cannot have outer name, ns");
this.xmlSerializer.Serialize(writer, this.extensionData);
}
else
{
Fx.Assert(this.xmlSerializer == null, "Xml serializer cannot be configured");
if (this.outerName != null)
{
writer.WriteStartElement(outerName, outerNamespace);
this.dataContractSerializer.WriteObjectContent(writer, this.extensionData);
writer.WriteEndElement();
}
else
{
this.dataContractSerializer.WriteObject(writer, this.extensionData);
}
}
}
internal void ComputeOuterNameAndNs(out string name, out string ns)
{
if (this.outerName != null)
{
Fx.Assert(this.xmlSerializer == null, "outer name is not null for data contract extension only");
name = this.outerName;
ns = this.outerNamespace;
}
else if (this.dataContractSerializer != null)
{
Fx.Assert(this.xmlSerializer == null, "only one of xmlserializer or datacontract serializer can be present");
XsdDataContractExporter dcExporter = new XsdDataContractExporter();
XmlQualifiedName qName = dcExporter.GetRootElementName(this.extensionData.GetType());
if (qName != null)
{
name = qName.Name;
ns = qName.Namespace;
}
else
{
// this can happen if an IXmlSerializable type is specified with IsAny=true
ReadOuterNameAndNs(out name, out ns);
}
}
else
{
Fx.Assert(this.dataContractSerializer == null, "only one of xmlserializer or datacontract serializer can be present");
XmlReflectionImporter importer = new XmlReflectionImporter();
XmlTypeMapping typeMapping = importer.ImportTypeMapping(this.extensionData.GetType());
if (typeMapping != null && !string.IsNullOrEmpty(typeMapping.ElementName))
{
name = typeMapping.ElementName;
ns = typeMapping.Namespace;
}
else
{
// this can happen if an IXmlSerializable type is specified with IsAny=true
ReadOuterNameAndNs(out name, out ns);
}
}
}
internal void ReadOuterNameAndNs(out string name, out string ns)
{
using (MemoryStream stream = new MemoryStream())
{
using (XmlWriter writer = XmlWriter.Create(stream))
{
this.WriteTo(writer);
}
stream.Seek(0, SeekOrigin.Begin);
using (XmlReader reader = XmlReader.Create(stream))
{
SyndicationFeedFormatter.MoveToStartElement(reader);
name = reader.LocalName;
ns = reader.NamespaceURI;
}
}
}
}
}
}
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