private static DiffOperation DiffValue(Tag first, Tag second)
{
if (first == null && second == null)
{
return(null);
}
else if (second == null)
{
return(new RemoveOperation());
}
else if (first == null)
{
return(new ChangeOperation(second));
}
else if (first.TagType != second.TagType)
{
return(new ChangeOperation(second));
}
else
{
switch (first.TagType)
{
case TagType.Byte:
case TagType.Short:
case TagType.Int:
case TagType.Long:
case TagType.Float:
case TagType.Double:
case TagType.String:
case TagType.ByteArray:
case TagType.IntArray:
return(first.DataEqual(second) ? null : new ChangeOperation(second));
case TagType.Compound:
CompoundDiff compDiff = Diff(first as TagCompound, second as TagCompound);
return(compDiff.IsEmpty ? null : new ChangeObjectOperation(compDiff));
case TagType.List:
if (AreIdArrays(first as TagList, second as TagList))
{
CompoundDiff subDiff = IdDiff(first as TagList, second as TagList);
return(subDiff.IsEmpty ? null : new ChangeIdArrayOperation(subDiff));
}
else
{
ListDiff subDiff = PositionDiff(first as TagList, second as TagList);
return(subDiff.IsEmpty ? null : new ChangePositionArrayOperation(subDiff));
}
default:
throw new Exception("Unexpected tag type");
}
}
}
private static DiffOperation DiffValue(Tag first, Tag second)
{
if (first == null && second == null)
return null;
else if (second == null)
return new RemoveOperation();
else if (first == null)
return new ChangeOperation(second);
else if (first.TagType != second.TagType)
return new ChangeOperation(second);
else {
switch (first.TagType) {
case TagType.Byte:
case TagType.Short:
case TagType.Int:
case TagType.Long:
case TagType.Float:
case TagType.Double:
case TagType.String:
case TagType.ByteArray:
case TagType.IntArray:
return first.DataEqual(second) ? null : new ChangeOperation(second);
case TagType.Compound:
CompoundDiff compDiff = Diff(first as TagCompound, second as TagCompound);
return compDiff.IsEmpty ? null : new ChangeObjectOperation(compDiff);
case TagType.List:
if (AreIdArrays(first as TagList, second as TagList)) {
CompoundDiff subDiff = IdDiff(first as TagList, second as TagList);
return subDiff.IsEmpty ? null : new ChangeIdArrayOperation(subDiff);
}
else {
ListDiff subDiff = PositionDiff(first as TagList, second as TagList);
return subDiff.IsEmpty ? null : new ChangePositionArrayOperation(subDiff);
}
default:
throw new Exception("Unexpected tag type");
}
}
}