/// <summary>
/// Ensures that any changes to the Dataset (if any) are discarded
/// </summary>
/// <remarks>
/// Rollsback the Active Transaction
/// </remarks>
public sealed override void Discard()
{
int i = this._actions.Count - 1;
int total = this._actions.Count;
while (i >= 0)
{
GraphPersistenceAction action = this._actions[i];
switch (action.Action)
{
case GraphPersistenceActionType.Added:
//If a Graph was added we must now remove it
if (this.HasGraphInternal(action.Graph.BaseUri))
{
this.RemoveGraphInternal(action.Graph.BaseUri);
}
break;
case GraphPersistenceActionType.Deleted:
//If a Graph was deleted we must now add it back again
//Don't add the full Graph only an empty Graph with the given URI
Graph g = new Graph();
g.BaseUri = action.Graph.BaseUri;
this.AddGraphInternal(g);
break;
case GraphPersistenceActionType.Modified:
//If a Graph was modified we must discard the changes
action.Graph.Discard();
break;
}
i--;
}
if (total == this._actions.Count)
{
this._actions.Clear();
}
else
{
this._actions.RemoveRange(0, total);
}
//Ensure any modifiable Graphs we've looked at have been Discarded
foreach (ITransactionalGraph g in this._modifiableGraphs.Graphs.OfType <ITransactionalGraph>())
{
g.Discard();
}
this._modifiableGraphs = new TripleStore();
this.DiscardInternal();
}
/// <summary>
/// Ensures that any changes to the Dataset (if any) are flushed to the underlying Storage
/// </summary>
/// <remarks>
/// Commits the Active Transaction
/// </remarks>
public sealed override void Flush()
{
int i = 0;
while (i < this._actions.Count)
{
GraphPersistenceAction action = this._actions[i];
switch (action.Action)
{
case GraphPersistenceActionType.Added:
//If Graph was added ensure any changes were flushed
action.Graph.Flush();
break;
case GraphPersistenceActionType.Deleted:
//If Graph was deleted can discard any changes
action.Graph.Discard();
break;
case GraphPersistenceActionType.Modified:
//If Graph was modified ensure any changes were flushed
action.Graph.Flush();
break;
}
i++;
}
this._actions.Clear();
//Ensure any Modifiable Graphs we've looked at have been Flushed()
foreach (ITransactionalGraph g in this._modifiableGraphs.Graphs.OfType <ITransactionalGraph>())
{
g.Flush();
}
this._modifiableGraphs = new TripleStore();
this.FlushInternal();
}
