//
// Atom10ItemFormatter.cs
//
// Author:
// Atsushi Enomoto <atsushi@ximian.com>
//
// Copyright (C) 2007 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//
// WARNING:
// This class is not for outputting ATOM 1.0 conformant XML. For example
// it does not report errors with related to the following constraints:
// - atom:entry elements MUST NOT contain more than one atom:link
// element with a rel attribute value of "alternate" that has the
// same combination of type and hreflang attribute values.
// - atom:entry elements that contain no child atom:content element
// MUST contain at least one atom:link element with a rel attribute
// value of "alternate".
//
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Globalization;
using System.IO;
using System.Runtime.Serialization;
using System.Text;
using System.Xml;
using System.Xml.Schema;
using System.Xml.Serialization;
namespace System.ServiceModel.Syndication{
[XmlRoot ("entry", Namespace = "http://www.w3.org/2005/Atom")]
public class Atom10ItemFormatter : SyndicationItemFormatter, IXmlSerializable
{
const string AtomNamespace ="http://www.w3.org/2005/Atom";
bool preserve_att_ext = true, preserve_elem_ext = true;
Type item_type;
public Atom10ItemFormatter ()
{
}
public Atom10ItemFormatter (SyndicationItem feedToWrite)
: base (feedToWrite)
{
}
public Atom10ItemFormatter (Type itemTypeToCreate)
{
if (itemTypeToCreate == null)
throw new ArgumentNullException ("itemTypeToCreate");
item_type = itemTypeToCreate;
}
protected Type ItemType {
get { return item_type; }
}
public bool PreserveAttributeExtensions {
get { return preserve_att_ext; }
set { preserve_att_ext = value; }
}
public bool PreserveElementExtensions {
get { return preserve_elem_ext; }
set { preserve_elem_ext = value; }
}
public override string Version {
get { return "Atom10"; }
}
protected override SyndicationItem CreateItemInstance ()
{
return new SyndicationItem ();
}
public override bool CanRead (XmlReader reader)
{
if (reader == null)
throw new ArgumentNullException ("reader");
reader.MoveToContent ();
return reader.IsStartElement ("entry", AtomNamespace);
}
public override void ReadFrom (XmlReader reader)
{
if (!CanRead (reader))
throw new XmlException (String.Format ("Element '{0}' in namespace '{1}' is not accepted by this syndication formatter", reader.LocalName, reader.NamespaceURI));
ReadXml (reader, true);
}
public override void WriteTo (XmlWriter writer)
{
WriteXml (writer, true);
}
void IXmlSerializable.ReadXml (XmlReader reader)
{
ReadXml (reader, false);
}
void IXmlSerializable.WriteXml (XmlWriter writer)
{
WriteXml (writer, false);
}
XmlSchema IXmlSerializable.GetSchema ()
{
return null;
}
// read
void ReadXml (XmlReader reader, bool fromSerializable)
{
if (reader == null)
throw new ArgumentNullException ("reader");
SetItem (CreateItemInstance ());
reader.MoveToContent ();
if (reader.MoveToFirstAttribute ()) {
do {
if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
continue;
if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, Item, Version) && PreserveAttributeExtensions)
Item.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
} while (reader.MoveToNextAttribute ());
}
reader.ReadStartElement ();
for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
if (reader.NodeType != XmlNodeType.Element)
throw new XmlException ("Only element node is expected under 'entry' element");
if (reader.NamespaceURI == AtomNamespace)
switch (reader.LocalName) {
case "author":
SyndicationPerson p = Item.CreatePerson ();
ReadPerson (reader, p);
Item.Authors.Add (p);
continue;
case "category":
SyndicationCategory c = Item.CreateCategory ();
ReadCategory (reader, c);
Item.Categories.Add (c);
continue;
case "contributor":
p = Item.CreatePerson ();
ReadPerson (reader, p);
Item.Contributors.Add (p);
continue;
case "id":
Item.Id = reader.ReadElementContentAsString ();
continue;
case "link":
SyndicationLink l = Item.CreateLink ();
ReadLink (reader, l);
Item.Links.Add (l);
continue;
case "published":
Item.PublishDate = XmlConvert.ToDateTimeOffset (reader.ReadElementContentAsString ());
continue;
case "rights":
Item.Copyright = ReadTextSyndicationContent (reader);
continue;
case "source":
Item.SourceFeed = ReadSourceFeed (reader);
continue;
case "summary":
Item.Summary = ReadTextSyndicationContent (reader);
continue;
case "title":
Item.Title = ReadTextSyndicationContent (reader);
continue;
case "updated":
Item.LastUpdatedTime = XmlConvert.ToDateTimeOffset (reader.ReadElementContentAsString ());
continue;
// Atom 1.0 does not specify "content" element, but it is required to distinguish Content property from extension elements.
case "content":
if (reader.GetAttribute ("src") != null) {
Item.Content = new UrlSyndicationContent (CreateUri (reader.GetAttribute ("src")), reader.GetAttribute ("type"));
reader.Skip ();
continue;
}
switch (reader.GetAttribute ("type")) {
case "text":
case "html":
case "xhtml":
Item.Content = ReadTextSyndicationContent (reader);
continue;
default:
SyndicationContent content;
if (!TryParseContent (reader, Item, reader.GetAttribute ("type"), Version, out content))
Item.Content = new XmlSyndicationContent (reader);
continue;
}
}
if (!TryParseElement (reader, Item, Version)) {
if (PreserveElementExtensions)
// FIXME: what to specify for maxExtensionSize
LoadElementExtensions (reader, Item, int.MaxValue);
else
reader.Skip ();
}
}
reader.ReadEndElement (); // </item>
}
TextSyndicationContent ReadTextSyndicationContent (XmlReader reader)
{
TextSyndicationContentKind kind = TextSyndicationContentKind.Plaintext;
switch (reader.GetAttribute ("type")) {
case "html":
kind = TextSyndicationContentKind.Html;
break;
case "xhtml":
kind = TextSyndicationContentKind.XHtml;
break;
}
string text = reader.ReadElementContentAsString ();
TextSyndicationContent t = new TextSyndicationContent (text, kind);
return t;
}
void ReadCategory (XmlReader reader, SyndicationCategory category)
{
if (reader.MoveToFirstAttribute ()) {
do {
if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
continue;
if (reader.NamespaceURI == String.Empty) {
switch (reader.LocalName) {
case "term":
category.Name = reader.Value;
continue;
case "scheme":
category.Scheme = reader.Value;
continue;
case "label":
category.Label = reader.Value;
continue;
}
}
if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, category, Version) && PreserveAttributeExtensions)
category.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
} while (reader.MoveToNextAttribute ());
reader.MoveToElement ();
}
if (!reader.IsEmptyElement) {
reader.Read ();
for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
if (!TryParseElement (reader, category, Version)) {
if (PreserveElementExtensions)
// FIXME: what should be used for maxExtenswionSize
LoadElementExtensions (reader, category, int.MaxValue);
else
reader.Skip ();
}
}
}
reader.Read (); // </category> or <category ... />
}
void ReadLink (XmlReader reader, SyndicationLink link)
{
if (reader.MoveToFirstAttribute ()) {
do {
if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
continue;
if (reader.NamespaceURI == String.Empty) {
switch (reader.LocalName) {
case "href":
link.Uri = CreateUri (reader.Value);
continue;
case "rel":
link.RelationshipType = reader.Value;
continue;
case "type":
link.MediaType = reader.Value;
continue;
case "length":
link.Length = XmlConvert.ToInt64 (reader.Value);
continue;
case "title":
link.Title = reader.Value;
continue;
}
}
if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, link, Version) && PreserveAttributeExtensions)
link.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
} while (reader.MoveToNextAttribute ());
reader.MoveToElement ();
}
if (!reader.IsEmptyElement) {
reader.Read ();
for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
if (!TryParseElement (reader, link, Version)) {
if (PreserveElementExtensions)
// FIXME: what should be used for maxExtenswionSize
LoadElementExtensions (reader, link, int.MaxValue);
else
reader.Skip ();
}
}
}
reader.Read (); // </link> or <link ... />
}
void ReadPerson (XmlReader reader, SyndicationPerson person)
{
if (reader.MoveToFirstAttribute ()) {
do {
if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
continue;
if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, person, Version) && PreserveAttributeExtensions)
person.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
} while (reader.MoveToNextAttribute ());
reader.MoveToElement ();
}
if (!reader.IsEmptyElement) {
reader.Read ();
for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
if (reader.NodeType == XmlNodeType.Element && reader.NamespaceURI == AtomNamespace) {
switch (reader.LocalName) {
case "name":
person.Name = reader.ReadElementContentAsString ();
continue;
case "uri":
person.Uri = reader.ReadElementContentAsString ();
continue;
case "email":
person.Email = reader.ReadElementContentAsString ();
continue;
}
}
if (!TryParseElement (reader, person, Version)) {
if (PreserveElementExtensions)
// FIXME: what should be used for maxExtenswionSize
LoadElementExtensions (reader, person, int.MaxValue);
else
reader.Skip ();
}
}
}
reader.Read (); // end element or empty element
}
SyndicationFeed ReadSourceFeed (XmlReader reader)
{
SyndicationFeed feed = null;
if (!reader.IsEmptyElement) {
reader.Read ();
Atom10FeedFormatter ff = new Atom10FeedFormatter ();
ff.ReadFrom (reader);
feed = ff.Feed;
}
else
feed = new SyndicationFeed ();
reader.Read (); // </source> or <source ... />
return feed;
}
Uri CreateUri (string uri)
{
return new Uri (uri, UriKind.RelativeOrAbsolute);
}
// write
void WriteXml (XmlWriter writer, bool writeRoot)
{
if (writer == null)
throw new ArgumentNullException ("writer");
if (Item == null)
throw new InvalidOperationException ("Syndication item must be set before writing");
if (writeRoot)
writer.WriteStartElement ("entry", AtomNamespace);
if (Item.BaseUri != null)
writer.WriteAttributeString ("xml:base", Item.BaseUri.ToString ());
// atom:entry elements MUST contain exactly one atom:id element.
writer.WriteElementString ("id", AtomNamespace, Item.Id ?? new UniqueId ().ToString ());
// atom:entry elements MUST contain exactly one atom:title element.
(Item.Title ?? new TextSyndicationContent (String.Empty)).WriteTo (writer, "title", AtomNamespace);
if (Item.Summary != null)
Item.Summary.WriteTo (writer, "summary", AtomNamespace);
if (!Item.PublishDate.Equals (default (DateTimeOffset))) {
writer.WriteStartElement ("published");
// FIXME: use DateTimeOffset itself once it is implemented.
writer.WriteString (XmlConvert.ToString (Item.PublishDate.UtcDateTime, XmlDateTimeSerializationMode.RoundtripKind));
writer.WriteEndElement ();
}
// atom:entry elements MUST contain exactly one atom:updated element.
writer.WriteStartElement ("updated", AtomNamespace);
// FIXME: use DateTimeOffset itself once it is implemented.
writer.WriteString (XmlConvert.ToString (Item.LastUpdatedTime.UtcDateTime, XmlDateTimeSerializationMode.RoundtripKind));
writer.WriteEndElement ();
foreach (SyndicationPerson author in Item.Authors)
if (author != null) {
writer.WriteStartElement ("author", AtomNamespace);
WriteAttributeExtensions (writer, author, Version);
writer.WriteElementString ("name", AtomNamespace, author.Name);
writer.WriteElementString ("uri", AtomNamespace, author.Uri);
writer.WriteElementString ("email", AtomNamespace, author.Email);
WriteElementExtensions (writer, author, Version);
writer.WriteEndElement ();
}
foreach (SyndicationPerson contributor in Item.Contributors) {
if (contributor != null) {
writer.WriteStartElement ("contributor", AtomNamespace);
WriteAttributeExtensions (writer, contributor, Version);
writer.WriteElementString ("name", AtomNamespace, contributor.Name);
writer.WriteElementString ("uri", AtomNamespace, contributor.Uri);
writer.WriteElementString ("email", AtomNamespace, contributor.Email);
WriteElementExtensions (writer, contributor, Version);
writer.WriteEndElement ();
}
}
foreach (SyndicationCategory category in Item.Categories)
if (category != null) {
writer.WriteStartElement ("category", AtomNamespace);
if (category.Name != null)
writer.WriteAttributeString ("term", category.Name);
if (category.Label != null)
writer.WriteAttributeString ("label", category.Label);
if (category.Scheme != null)
writer.WriteAttributeString ("scheme", category.Scheme);
WriteAttributeExtensions (writer, category, Version);
WriteElementExtensions (writer, category, Version);
writer.WriteEndElement ();
}
foreach (SyndicationLink link in Item.Links)
if (link != null) {
writer.WriteStartElement ("link");
if (link.RelationshipType != null)
writer.WriteAttributeString ("rel", link.RelationshipType);
if (link.MediaType != null)
writer.WriteAttributeString ("type", link.MediaType);
if (link.Title != null)
writer.WriteAttributeString ("title", link.Title);
if (link.Length != 0)
writer.WriteAttributeString ("length", link.Length.ToString (CultureInfo.InvariantCulture));
writer.WriteAttributeString ("href", link.Uri != null ? link.Uri.ToString () : String.Empty);
WriteAttributeExtensions (writer, link, Version);
WriteElementExtensions (writer, link, Version);
writer.WriteEndElement ();
}
if (Item.Content != null)
Item.Content.WriteTo (writer, "content", AtomNamespace);
if (Item.Copyright != null)
Item.Copyright.WriteTo (writer, "rights", AtomNamespace);
if (Item.SourceFeed != null) {
writer.WriteStartElement ("source", AtomNamespace);
Item.SourceFeed.SaveAsAtom10 (writer);
writer.WriteEndElement ();
}
WriteElementExtensions (writer, Item, Version);
if (writeRoot)
writer.WriteEndElement ();
}
}
}
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