/// <summary>Recursively clone the current element and all it's children and return a new navigator for the resulting subtree.</summary>
/// <returns>A new <see cref="ElementDefinitionNavigator"/> instance that wraps the cloned element list.</returns>
internal static ElementDefinitionNavigator CloneSubtree(this ElementDefinitionNavigator nav)
{
if (nav == null)
{
throw new ArgumentNullException(nameof(nav));
}
if (nav.Current == null)
{
throw new ArgumentException(nameof(nav));
}
var result = new ElementDefinitionNavigator(new ElementDefinition[] { (ElementDefinition)nav.Current.DeepCopy() });
result.MoveToFirstChild();
result.CopyChildren(nav);
return(result);
}
/// <summary>
/// Insert the children of the source navigator under the node pointed to by this Navigator.
/// </summary>
/// <param name="dest"></param>
/// <param name="source"></param>
/// <returns></returns>
public static bool CopyChildren(this ElementDefinitionNavigator dest, ElementDefinitionNavigator source)
{
if (dest.HasChildren)
{
return(false); // Protect children from being overwritten
}
if (!source.MoveToFirstChild())
{
return(true); // Nothing to copy, but successful anyway
}
bool firstChild = true;
do
{
var copiedChild = (ElementDefinition)source.Current.DeepCopy();
if (firstChild)
{
// The first time, create a new child in the destination
dest.InsertFirstChild(copiedChild);
firstChild = false;
}
else
{
// Then insert other childs after that
dest.InsertAfter(copiedChild);
}
// If there are nested children in the source, insert them under
// the newly inserted node in the destination
if (source.HasChildren)
{
dest.CopyChildren(source);
}
}while (source.MoveToNext());
// Bring both source & destination back one step to the original parents
source.MoveToParent();
dest.MoveToParent();
return(true);
}