/// <summary>Sets the <see cref="AtomTextNode.Text"/> of this node, and sets the <see cref="AtomTextNode.Type"/> of this node to <see cref="AtomTextType.Text"/>.</summary>
/// <param name="text">A <see cref="string"/> representing the text to set.</param>
/// <param name="type">An <see cref="AtomTextType"/> representing the type of text.</param>
/// <exception cref="ArgumentNullException"><paramref name="text"/> is null.</exception>
/// <exception cref="ArgumentException"><paramref name="text"/> is an empty <see cref="string"/>, or <paramref name="type"/> is "xhtml" and <paramref name="text"/> is not a valid XHTML element.</exception>
/// <exception cref="InvalidOperationException"><paramref name="type"/> is "xhtml" and <paramref name="text"/> is not a valid XHTML div element.</exception>
public void SetText(string text, AtomTextType type)
{
if(text == null) throw new ArgumentNullException("text");
if(text == "") throw new ArgumentException(Errors.EmptyString, "text");
if(type == AtomTextType.Xhtml)
{
XElement div = null;
try { div = XElement.Parse(text); }
catch(Exception) { throw new ArgumentException(Errors.NotAnElement, "text"); }
if(div.Name != XhtmlNamespace + "div") throw new InvalidOperationException(Errors.NotAnXhtmlDiv);
this.Element.ReplaceNodes(div);
}
else
this.Element.SetValue(text);
this.Element.SetAttributeValue("type", type == AtomTextType.None ? null : type.ToString().ToLower());
}
