public override Element Apply(Difference difference)
{
if (difference == null)
{
throw new ArgumentNullException("difference");
}
if (!difference.Identifier.Equals(this.Identifier))
{
throw new MergeException("Cannot apply a difference that does not share the same identifier with the element.");
}
if (difference is NodeDifference)
{
var mergedChilds = new ElementHashList(r_childs);
foreach (var subdifference in ((NodeDifference)difference).Subdifferences)
{
switch (subdifference.OperationOnParent)
{
case OperationOnParent.Added:
mergedChilds.Add(subdifference.Identifier.CreateEmptyElement().Apply(subdifference));
break;
case OperationOnParent.Modified:
mergedChilds.AddOrUpdate(mergedChilds[subdifference.Identifier].Apply(subdifference));
break;
case OperationOnParent.Removed:
mergedChilds.Remove(subdifference.Identifier);
break;
default:
throw new ArgumentOutOfRangeException("subdifference.OperationOnParent", subdifference.OperationOnParent, "Invalid value");
}
}
return(new NodeElement(this.Identifier, mergedChilds));
}
else
{
throw new MergeException(string.Format("Cannot apply a {0} on a {1}.", difference.GetType().Name, this.GetType().Name));
}
}