SyndicationFeedFormatter.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / NetFx35 / System.ServiceModel.Web / System / ServiceModel / Syndication / SyndicationFeedFormatter.cs / 1 / SyndicationFeedFormatter.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.ServiceModel.Syndication 
{
    using System; 
    using System.Collections.Generic; 
    using System.Xml;
    using System.Runtime.Serialization; 
    using System.Globalization;
    using System.Xml.Serialization;
    using System.ServiceModel.Channels;
    using System.Xml.Schema; 
    using System.Diagnostics.CodeAnalysis;
    using System.Diagnostics; 
    using System.ServiceModel.Diagnostics; 
    using System.ServiceModel.Web;
    using DiagnosticUtility = System.ServiceModel.DiagnosticUtility; 

    [DataContract]
    public abstract class SyndicationFeedFormatter
    { 
        SyndicationFeed feed;
 
        protected SyndicationFeedFormatter() 
        {
            this.feed = null; 
        }

        protected SyndicationFeedFormatter(SyndicationFeed feedToWrite)
        { 
            if (feedToWrite == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feedToWrite"); 
            }
            this.feed = feedToWrite; 
        }

        public SyndicationFeed Feed
        { 
            get
            { 
                return this.feed; 
            }
        } 

        public abstract string Version
        { get; }
 
        public abstract bool CanRead(XmlReader reader);
 
        public abstract void ReadFrom(XmlReader reader); 

        public override string ToString() 
        {
            return String.Format(CultureInfo.CurrentCulture, "{0}, SyndicationVersion={1}", this.GetType(), this.Version);
        }
 
        public abstract void WriteTo(XmlWriter writer);
 
        internal static protected SyndicationCategory CreateCategory(SyndicationFeed feed) 
        {
            if (feed == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed");
            }
            return GetNonNullValue(feed.CreateCategory(), SR2.FeedCreatedNullCategory); 
        }
 
        internal static protected SyndicationCategory CreateCategory(SyndicationItem item) 
        {
            if (item == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("item");
            }
            return GetNonNullValue(item.CreateCategory(), SR2.ItemCreatedNullCategory); 
        }
 
        internal static protected SyndicationItem CreateItem(SyndicationFeed feed) 
        {
            if (feed == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed");
            }
            return GetNonNullValue(feed.CreateItem(), SR2.FeedCreatedNullItem); 
        }
 
        internal static protected SyndicationLink CreateLink(SyndicationFeed feed) 
        {
            if (feed == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed");
            }
            return GetNonNullValue(feed.CreateLink(), SR2.FeedCreatedNullPerson); 
        }
 
        internal static protected SyndicationLink CreateLink(SyndicationItem item) 
        {
            if (item == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("item");
            }
            return GetNonNullValue(item.CreateLink(), SR2.ItemCreatedNullPerson); 
        }
 
        internal static protected SyndicationPerson CreatePerson(SyndicationFeed feed) 
        {
            if (feed == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed");
            }
            return GetNonNullValue(feed.CreatePerson(), SR2.FeedCreatedNullPerson); 
        }
 
        internal static protected SyndicationPerson CreatePerson(SyndicationItem item) 
        {
            if (item == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("item");
            }
            return GetNonNullValue(item.CreatePerson(), SR2.ItemCreatedNullPerson); 
        }
 
        internal static protected void LoadElementExtensions(XmlReader reader, SyndicationFeed feed, int maxExtensionSize) 
        {
            if (feed == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed");
            }
            feed.LoadElementExtensions(reader, maxExtensionSize); 
        }
 
        internal static protected void LoadElementExtensions(XmlReader reader, SyndicationItem item, int maxExtensionSize) 
        {
            if (item == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("item");
            }
            item.LoadElementExtensions(reader, maxExtensionSize); 
        }
 
        internal static protected void LoadElementExtensions(XmlReader reader, SyndicationCategory category, int maxExtensionSize) 
        {
            if (category == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("category");
            }
            category.LoadElementExtensions(reader, maxExtensionSize); 
        }
 
        internal static protected void LoadElementExtensions(XmlReader reader, SyndicationLink link, int maxExtensionSize) 
        {
            if (link == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("link");
            }
            link.LoadElementExtensions(reader, maxExtensionSize); 
        }
 
        internal static protected void LoadElementExtensions(XmlReader reader, SyndicationPerson person, int maxExtensionSize) 
        {
            if (person == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("person");
            }
            person.LoadElementExtensions(reader, maxExtensionSize); 
        }
 
        internal static protected bool TryParseAttribute(string name, string ns, string value, SyndicationFeed feed, string version) 
        {
            if (feed == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed");
            }
            if (FeedUtils.IsXmlns(name, ns)) 
            {
                return true; 
            } 
            return feed.TryParseAttribute(name, ns, value, version);
        } 

        internal static protected bool TryParseAttribute(string name, string ns, string value, SyndicationItem item, string version)
        {
            if (item == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("item"); 
            } 
            if (FeedUtils.IsXmlns(name, ns))
            { 
                return true;
            }
            return item.TryParseAttribute(name, ns, value, version);
        } 

        internal static protected bool TryParseAttribute(string name, string ns, string value, SyndicationCategory category, string version) 
        { 
            if (category == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("category");
            }
            if (FeedUtils.IsXmlns(name, ns))
            { 
                return true;
            } 
            return category.TryParseAttribute(name, ns, value, version); 
        }
 
        internal static protected bool TryParseAttribute(string name, string ns, string value, SyndicationLink link, string version)
        {
            if (link == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("link");
            } 
            if (FeedUtils.IsXmlns(name, ns)) 
            {
                return true; 
            }
            return link.TryParseAttribute(name, ns, value, version);
        }
 
        internal static protected bool TryParseAttribute(string name, string ns, string value, SyndicationPerson person, string version)
        { 
            if (person == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("person"); 
            }
            if (FeedUtils.IsXmlns(name, ns))
            {
                return true; 
            }
            return person.TryParseAttribute(name, ns, value, version); 
        } 

        internal static protected bool TryParseContent(XmlReader reader, SyndicationItem item, string contentType, string version, out SyndicationContent content) 
        {
            return item.TryParseContent(reader, contentType, version, out content);
        }
 
        internal static protected bool TryParseElement(XmlReader reader, SyndicationFeed feed, string version)
        { 
            if (feed == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed"); 
            }
            return feed.TryParseElement(reader, version);
        }
 
        internal static protected bool TryParseElement(XmlReader reader, SyndicationItem item, string version)
        { 
            if (item == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("item"); 
            }
            return item.TryParseElement(reader, version);
        }
 
        internal static protected bool TryParseElement(XmlReader reader, SyndicationCategory category, string version)
        { 
            if (category == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("category"); 
            }
            return category.TryParseElement(reader, version);
        }
 
        internal static protected bool TryParseElement(XmlReader reader, SyndicationLink link, string version)
        { 
            if (link == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("link"); 
            }
            return link.TryParseElement(reader, version);
        }
 
        internal static protected bool TryParseElement(XmlReader reader, SyndicationPerson person, string version)
        { 
            if (person == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("person"); 
            }
            return person.TryParseElement(reader, version);
        }
 
        internal static protected void WriteAttributeExtensions(XmlWriter writer, SyndicationFeed feed, string version)
        { 
            if (feed == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed"); 
            }
            feed.WriteAttributeExtensions(writer, version);
        }
 
        internal static protected void WriteAttributeExtensions(XmlWriter writer, SyndicationItem item, string version)
        { 
            if (item == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("item"); 
            }
            item.WriteAttributeExtensions(writer, version);
        }
 
        internal static protected void WriteAttributeExtensions(XmlWriter writer, SyndicationCategory category, string version)
        { 
            if (category == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("category"); 
            }
            category.WriteAttributeExtensions(writer, version);
        }
 
        internal static protected void WriteAttributeExtensions(XmlWriter writer, SyndicationLink link, string version)
        { 
            if (link == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("link"); 
            }
            link.WriteAttributeExtensions(writer, version);
        }
 
        internal static protected void WriteAttributeExtensions(XmlWriter writer, SyndicationPerson person, string version)
        { 
            if (person == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("person"); 
            }
            person.WriteAttributeExtensions(writer, version);
        }
 
        internal static protected void WriteElementExtensions(XmlWriter writer, SyndicationFeed feed, string version)
        { 
            if (feed == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed"); 
            }
            feed.WriteElementExtensions(writer, version);
        }
 
        internal static protected void WriteElementExtensions(XmlWriter writer, SyndicationItem item, string version)
        { 
            if (item == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("item"); 
            }
            item.WriteElementExtensions(writer, version);
        }
 
        internal static protected void WriteElementExtensions(XmlWriter writer, SyndicationCategory category, string version)
        { 
            if (category == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("category"); 
            }
            category.WriteElementExtensions(writer, version);
        }
 
        internal static protected void WriteElementExtensions(XmlWriter writer, SyndicationLink link, string version)
        { 
            if (link == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("link"); 
            }
            link.WriteElementExtensions(writer, version);
        }
 
        internal static protected void WriteElementExtensions(XmlWriter writer, SyndicationPerson person, string version)
        { 
            if (person == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("person"); 
            }
            person.WriteElementExtensions(writer, version);
        }
 
        internal protected virtual void SetFeed(SyndicationFeed feed)
        { 
            if (feed == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed"); 
            }
            this.feed = feed;
        }
 
        internal static void CloseBuffer(XmlBuffer buffer, XmlDictionaryWriter extWriter)
        { 
            if (buffer == null) 
            {
                return; 
            }
            extWriter.WriteEndElement();
            buffer.CloseSection();
            buffer.Close(); 
        }
 
        internal static void CreateBufferIfRequiredAndWriteNode(ref XmlBuffer buffer, ref XmlDictionaryWriter extWriter, XmlReader reader, int maxExtensionSize) 
        {
            if (buffer == null) 
            {
                buffer = new XmlBuffer(maxExtensionSize);
                extWriter = buffer.OpenSection(XmlDictionaryReaderQuotas.Max);
                extWriter.WriteStartElement(Rss20Constants.ExtensionWrapperTag); 
            }
            extWriter.WriteNode(reader, false); 
        } 

        internal static SyndicationFeed CreateFeedInstance(Type feedType) 
        {
            if (feedType.Equals(typeof(SyndicationFeed)))
            {
                return new SyndicationFeed(); 
            }
            else 
            { 
                return (SyndicationFeed) Activator.CreateInstance(feedType);
            } 
        }

        internal static void LoadElementExtensions(XmlBuffer buffer, XmlDictionaryWriter writer, SyndicationFeed feed)
        { 
            if (feed == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("feed"); 
            }
            CloseBuffer(buffer, writer); 
            feed.LoadElementExtensions(buffer);
        }

        internal static void LoadElementExtensions(XmlBuffer buffer, XmlDictionaryWriter writer, SyndicationItem item) 
        {
            if (item == null) 
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("item");
            } 
            CloseBuffer(buffer, writer);
            item.LoadElementExtensions(buffer);
        }
 
        internal static void LoadElementExtensions(XmlBuffer buffer, XmlDictionaryWriter writer, SyndicationCategory category)
        { 
            if (category == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("category"); 
            }
            CloseBuffer(buffer, writer);
            category.LoadElementExtensions(buffer);
        } 

        internal static void LoadElementExtensions(XmlBuffer buffer, XmlDictionaryWriter writer, SyndicationLink link) 
        { 
            if (link == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("link");
            }
            CloseBuffer(buffer, writer);
            link.LoadElementExtensions(buffer); 
        }
 
        internal static void LoadElementExtensions(XmlBuffer buffer, XmlDictionaryWriter writer, SyndicationPerson person) 
        {
            if (person == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("person");
            }
            CloseBuffer(buffer, writer); 
            person.LoadElementExtensions(buffer);
        } 
 
        internal static void MoveToStartElement(XmlReader reader)
        { 
            Fx.Assert(reader != null, "reader != null");
            if (!reader.IsStartElement())
            {
                XmlExceptionHelper.ThrowStartElementExpected(XmlDictionaryReader.CreateDictionaryReader(reader)); 
            }
        } 
 
        internal static void TraceFeedReadBegin()
        { 
            if (DiagnosticUtility.ShouldTraceInformation)
            {
                DiagnosticUtility.DiagnosticTrace.TraceEvent(TraceEventType.Information, TraceCode.SyndicationReadFeedBegin, SR2.GetString(SR2.TraceCodeSyndicationFeedReadBegin));
            } 
        }
 
        internal static void TraceFeedReadEnd() 
        {
            if (DiagnosticUtility.ShouldTraceInformation) 
            {
                DiagnosticUtility.DiagnosticTrace.TraceEvent(TraceEventType.Information, TraceCode.SyndicationReadFeedEnd, SR2.GetString(SR2.TraceCodeSyndicationFeedReadEnd));
            }
        } 

        internal static void TraceFeedWriteBegin() 
        { 
            if (DiagnosticUtility.ShouldTraceInformation)
            { 
                DiagnosticUtility.DiagnosticTrace.TraceEvent(TraceEventType.Information, TraceCode.SyndicationWriteFeedBegin, SR2.GetString(SR2.TraceCodeSyndicationFeedWriteBegin));
            }
        }
 
        internal static void TraceFeedWriteEnd()
        { 
            if (DiagnosticUtility.ShouldTraceInformation) 
            {
                DiagnosticUtility.DiagnosticTrace.TraceEvent(TraceEventType.Information, TraceCode.SyndicationWriteFeedEnd, SR2.GetString(SR2.TraceCodeSyndicationFeedWriteEnd)); 
            }
        }

        internal static void TraceItemReadBegin() 
        {
            if (DiagnosticUtility.ShouldTraceInformation) 
            { 
                DiagnosticUtility.DiagnosticTrace.TraceEvent(TraceEventType.Information, TraceCode.SyndicationReadItemBegin, SR2.GetString(SR2.TraceCodeSyndicationItemReadBegin));
            } 
        }

        internal static void TraceItemReadEnd()
        { 
            if (DiagnosticUtility.ShouldTraceInformation)
            { 
                DiagnosticUtility.DiagnosticTrace.TraceEvent(TraceEventType.Information, TraceCode.SyndicationReadItemEnd, SR2.GetString(SR2.TraceCodeSyndicationItemReadEnd)); 
            }
        } 

        internal static void TraceItemWriteBegin()
        {
            if (DiagnosticUtility.ShouldTraceInformation) 
            {
                DiagnosticUtility.DiagnosticTrace.TraceEvent(TraceEventType.Information, TraceCode.SyndicationWriteItemBegin, SR2.GetString(SR2.TraceCodeSyndicationItemWriteBegin)); 
            } 
        }
 
        internal static void TraceItemWriteEnd()
        {
            if (DiagnosticUtility.ShouldTraceInformation)
            { 
                DiagnosticUtility.DiagnosticTrace.TraceEvent(TraceEventType.Information, TraceCode.SyndicationWriteItemEnd, SR2.GetString(SR2.TraceCodeSyndicationItemWriteEnd));
            } 
        } 

        internal static void TraceSyndicationElementIgnoredOnRead(XmlReader reader) 
        {
            if (DiagnosticUtility.ShouldTraceInformation)
            {
                DiagnosticUtility.DiagnosticTrace.TraceEvent(TraceEventType.Information, TraceCode.SyndicationProtocolElementIgnoredOnRead, SR2.GetString(SR2.TraceCodeSyndicationProtocolElementIgnoredOnRead, reader.NodeType, reader.LocalName, reader.NamespaceURI)); 
            }
        } 
 
        protected abstract SyndicationFeed CreateFeedInstance();
 
        static T GetNonNullValue(T value, string errorMsg)
        {
            if (value == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.GetString(errorMsg)));
            } 
            return value; 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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