public override Difference CompareTo(Element oldElement)
{
if (oldElement == null)
throw new ArgumentNullException("oldElement");
if (!oldElement.Identifier.Equals(this.Identifier))
throw new MergeException("Cannot compare elements that does not share the same identifier.");
if (oldElement is ValueElement)
{
return new ValueDifference(
this.Identifier,
OperationOnParent.Removed,
((ValueElement)oldElement).Value,
null);
}
else if (oldElement is NodeElement)
{
return new NodeDifference(
this.Identifier,
OperationOnParent.Removed,
null);
}
else
{
throw new MergeException(string.Format("Cannot compare a {0} to a {1}.", oldElement.GetType().Name, this.GetType().Name));
}
}
public override Difference CompareTo(Element oldElement)
{
if (oldElement == null)
throw new ArgumentNullException("oldElement");
if (!oldElement.Identifier.Equals(this.Identifier))
throw new MergeException("Cannot compare elements that does not share the same identifier.");
OperationOnParent operationOnParent;
ElementHashList oldChilds;
if (oldElement is EmptyElement)
{
operationOnParent = OperationOnParent.Added;
oldChilds = new ElementHashList();
}
else if (oldElement is NodeElement)
{
operationOnParent = OperationOnParent.Modified;
oldChilds = ((NodeElement)oldElement).Childs;
}
else
{
throw new MergeException(string.Format("Cannot compare a {0} to a {1}.", oldElement.GetType().Name, this.GetType().Name));
}
var differences = new List<Difference>();
var newChilds = this.Childs;
foreach (var oldChild in oldChilds)
{
var newChild = newChilds.Contains(oldChild.Identifier)
? newChilds[oldChild.Identifier]
: oldChild.Identifier.CreateEmptyElement();
var difference = newChild.CompareTo(oldChild);
if (difference != null)
{
differences.Add(difference);
}
}
foreach (var newChild in newChilds)
{
if (!oldChilds.Contains(newChild.Identifier))
{
Element oldChild = newChild.Identifier.CreateEmptyElement();
differences.Add(newChild.CompareTo(oldChild));
}
}
return differences.Count > 0
? new NodeDifference(this.Identifier, operationOnParent, differences)
: null;
}
public abstract Difference CompareTo(Element oldElement);
