/// <summary>
/// Creates an element of the given type or returns null, if there is
/// no such type.
/// </summary>
/// <typeparam name="TElement">The type of element to create.</typeparam>
/// <param name="document">The responsible document.</param>
/// <returns>The new element, if available.</returns>
public static TElement CreateElement <TElement>(this IDocument document)
where TElement : IElement
{
var type = typeof(ApiExtensions).GetAssembly().GetTypes()
.Where(m => m.Implements <TElement>())
.FirstOrDefault(m => !m.IsAbstractClass());
if (type == null)
{
return(default(TElement));
}
var ctor = type.GetConstructor();
if (ctor == null)
{
return(default(TElement));
}
var element = (TElement)ctor.Invoke(null);
var el = element as Element;
if (element != null)
{
document.Adopt(element);
}
if (el != null)
{
el.Close();
}
return(element);
}
/// <summary>
/// Creates an element of the given type or throws an exception, if
/// there is no such type.
/// </summary>
/// <typeparam name="TElement">The type of the element.</typeparam>
/// <param name="document">The responsible document.</param>
/// <returns>The created element.</returns>
public static TElement CreateElement <TElement>(this IDocument document)
where TElement : IElement
{
if (document == null)
{
throw new ArgumentNullException("document");
}
var type = typeof(ApiExtensions).GetAssembly().GetTypes()
.Where(m => m.Implements <TElement>())
.FirstOrDefault(m => !m.IsAbstractClass());
if (type != null)
{
var ctors = type.GetConstructors()
.OrderBy(m => m.GetParameters().Length);
foreach (var ctor in ctors)
{
var parameters = ctor.GetParameters();
var arguments = new Object[parameters.Length];
for (var i = 0; i < parameters.Length; i++)
{
var isDocument = parameters[i].ParameterType == typeof(Document);
arguments[i] = isDocument ? document : parameters[i].DefaultValue;
}
var obj = ctor.Invoke(arguments);
if (obj != null)
{
var element = (TElement)obj;
var baseElement = element as Element;
if (baseElement != null)
{
baseElement.SetupElement();
}
document.Adopt(element);
return(element);
}
}
}
throw new ArgumentException("No element could be created for the provided interface.");
}
/// <summary>
/// Creates an element of the given type or returns null, if there is
/// no such type.
/// </summary>
/// <typeparam name="TElement">The type of element to create.</typeparam>
/// <param name="document">The responsible document.</param>
/// <returns>The new element, if available.</returns>
public static TElement CreateElement <TElement>(this IDocument document)
where TElement : IElement
{
if (document == null)
{
throw new ArgumentNullException("document");
}
var type = typeof(ApiExtensions).GetAssembly().GetTypes()
.Where(m => m.Implements <TElement>())
.FirstOrDefault(m => !m.IsAbstractClass());
if (type == null)
{
return(default(TElement));
}
var ctor = type.GetConstructor();
var parameterLess = ctor != null;
if (parameterLess == false)
{
ctor = type.GetConstructor(new Type[] { typeof(Document) });
}
if (ctor == null)
{
return(default(TElement));
}
var element = (TElement)(parameterLess ? ctor.Invoke(null) : ctor.Invoke(new Object[] { document }));
var el = element as Element;
if (element != null)
{
document.Adopt(element);
}
return(element);
}
