/// <summary>
/// Finds the difference operation between two Json value items.
/// </summary>
private static DiffOperation DiffValue(object first, object 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.GetType() != second.GetType())
{
return(new ChangeOperation(second));
}
else if (first is double)
{
return((double)first == (double)second ? null : new ChangeOperation(second));
}
else if (first is bool)
{
return((bool)first == (bool)second ? null : new ChangeOperation(second));
}
else if (first is string)
{
return((string)first == (string)second ? null : new ChangeOperation(second));
}
else if (first is Hashtable)
{
HashDiff subdiff = Diff(first as Hashtable, second as Hashtable);
return(subdiff.Empty() ? null : new ChangeObjectOperation(subdiff));
}
else if (first is ArrayList)
{
if (AreIdArrays(first as ArrayList, second as ArrayList))
{
HashDiff subdiff = IdDiff(first as ArrayList, second as ArrayList);
return(subdiff.Empty() ? null : new ChangeIdArrayOperation(subdiff));
}
else
{
PositionArrayDiff subdiff = PositionDiff(first as ArrayList, second as ArrayList);
return(subdiff.Empty() ? null : new ChangePositionArrayOperation(subdiff));
}
}
else
{
throw new System.Exception("error");
}
}
