//
// System.ServiceModel.Syndication.SyndicationSerializer
//
// Authors:
//	Joel Reed (joelwreed@gmail.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.
//

using System;
using System.Xml;

namespace System.ServiceModel.Syndication
{
	public abstract class SyndicationSerializer
	{
		protected abstract string FeedName { get; }
		protected abstract string FeedNamespace { get; }

		protected abstract string ItemName { get; }
		protected abstract string ItemNamespace { get; }

		internal abstract void WriteXml(XmlWriter writer, SyndicationFeed feed);
		internal abstract void WriteXml(XmlWriter writer, SyndicationItem item);

		public void WriteTo(XmlWriter writer, SyndicationFeed feed)
		{
			WriteXml(writer, feed);
		}

		public void WriteTo(XmlWriter writer, SyndicationItem item)
		{
			WriteXml(writer, item);
		}

		internal void WriteXml(XmlWriter writer, SyndicationContent content,
													 string outerElementName)
		{
			WriteXml(writer, content, outerElementName, false);
		}

		internal void WriteXml(XmlWriter writer, SyndicationContent content,
													 string outerElementName, bool writeEmptyNodes)
		{
			if (content != null)
				{
					content.WriteTo(writer, outerElementName, FeedNamespace);
					return;
				}

			if (!writeEmptyNodes) return;
			 
			// write out empty node if necessary
			TextSyndicationContent emptyNode = new TextSyndicationContent("");
			emptyNode.WriteTo(writer, outerElementName, FeedNamespace);
		}
	}
}