GoogleReader subscription

gistfile1.cs

public abstract class GoogleSyndicationItem
{
	/// <summary>
	/// Initialize the item.
	/// </summary>
	/// <param name="item"></param>
	internal GoogleSyndicationItem(SyndicationItem item)
	{
		if (item != null)
		{
			LoadItem(item);
		}
	}

	/// <summary>
	/// Load the item (to be implemented by inheriting classes).
	/// </summary>
	/// <param name="item"></param>
	protected abstract void LoadItem(SyndicationItem item);

	/// <summary>
	/// Get the text from a TextSyndicationContent.
	/// </summary>
	/// <param name="content"></param>
	/// <returns></returns>
	public string GetTextSyndicationContent(SyndicationContent content)
	{
		TextSyndicationContent txt = content as TextSyndicationContent;
		if (txt != null)
			return txt.Text;
		else
			return "";
	}
}

public abstract class GoogleXmlItem : SyndicationItem
{
	/// <summary>
	/// Initialize the item.
	/// </summary>
	/// <param name="item"></param>
	internal GoogleXmlItem(XElement item)
	{
		if (item != null)
		{
			LoadItem(item);
		}
	}

	/// <summary>
	/// Load the item (to be implemented by inheriting classes).
	/// </summary>
	/// <param name="item"></param>
	protected abstract void LoadItem(XElement item);

	/// <summary>
	/// Get a list of descendants.
	/// </summary>
	/// <param name="item"></param>
	/// <param name="descendant"></param>
	/// <param name="attribute"></param>
	/// <param name="attributeValue"></param>
	/// <returns></returns>
	protected IEnumerable<XElement> GetDescendants(XElement item, string descendant,
	   string attribute, string attributeValue)
	{
		return item.Descendants(descendant).Where(o => o.Attribute(attribute) != null
		   && o.Attribute(attribute).Value == attributeValue);
	}

	/// <summary>
	/// Get a descendant.
	/// </summary>
	/// <param name="item"></param>
	/// <param name="descendant"></param>
	/// <param name="attribute"></param>
	/// <param name="attributeValue"></param>
	/// <returns></returns>
	protected XElement GetDescendant(XElement item, string descendant,
	   string attribute, string attributeValue)
	{
		return GetDescendants(item, descendant, attribute, attributeValue).First();
	}

	/// <summary>
	/// Get the value of a descendant.
	/// </summary>
	/// <param name="item"></param>
	/// <param name="descendant"></param>
	/// <param name="attribute"></param>
	/// <param name="attributeValue"></param>
	/// <returns></returns>
	protected string GetDescendantValue(XElement item, string descendant,
	   string attribute, string attributeValue)
	{
		var desc = GetDescendant(item, descendant, attribute, attributeValue);
		if (desc != null)
			return desc.Value;
		else
			return "";
	}
}