/// <summary>
/// Generates a diffgram object graph corresponding
/// to the provided business object graph.
/// </summary>
/// <param name="root">Root of the business object graph
/// to be exported into the diffgram.</param>
/// <returns>
/// A DataItem representing the root of the diffgram object graph.
/// </returns>
public DataItem GenerateGraph(IExportData root)
{
if (root != null && root.IsParticipating)
{
_lastKey++;
root.Key = _lastKey;
DataItem result = new DataItem { Key = root.Key };
var track = root as Csla.Core.ITrackStatus;
if (track != null)
{
result.IsNew = track.IsNew;
result.IsDeleted = track.IsDeleted;
}
root.ExportTo(result);
foreach (var item in root.GetChildren())
{
var ci = GenerateGraph(item);
if (ci != null)
result.Children.Add(ci);
}
return result;
}
else
return null;
}
protected override void ExportTo(Csla.DiffGram.DataItem dto)
{
dto.DataFields.Add(new Csla.DiffGram.DataField {
Name = "Id", Value = Id
});
dto.DataFields.Add(new Csla.DiffGram.DataField {
Name = "ProductName", Value = ProductName
});
}
/// <summary>
/// Integrates a diffgram object graph into an
/// existing business object graph.
/// </summary>
/// <param name="root">Root of the business object graph.</param>
/// <param name="dtoGraph">Root of the diffgram object
/// graph containing the data used to update the business
/// object graph.</param>
public void IntegrateGraph(IExportData root, DataItem dtoGraph)
{
if (root != null && root.IsParticipating)
{
if (root.Key == dtoGraph.Key)
{
foreach (var child in root.GetChildren().Where(c => c.IsParticipating))
{
var dto = (from d in dtoGraph.Children
where d.Key == child.Key
select d).SingleOrDefault();
if (dto != null)
IntegrateGraph(child, dto);
else
throw new Exception("Child key not in DTO graph");
}
root.ImportFrom(dtoGraph);
}
else
throw new Exception("Root object keys don't match");
}
}
protected override void ImportFrom(Csla.DiffGram.DataItem dto)
{
// update changed values here
}
