/// <summary>
/// Processes a DROP command
/// </summary>
/// <param name="cmd">Drop Command</param>
public void ProcessDropCommand(DropCommand cmd)
{
if (this._manager is IUpdateableGenericIOManager)
{
((IUpdateableGenericIOManager)this._manager).Update(cmd.ToString());
}
else
{
try
{
Graph g;
switch (cmd.Mode)
{
case ClearMode.Graph:
case ClearMode.Default:
if (this._manager.DeleteSupported)
{
//If available use DeleteGraph()
this._manager.DeleteGraph(cmd.TargetUri);
}
else if ((cmd.TargetUri == null && (this._manager.IOBehaviour & IOBehaviour.OverwriteDefault) != 0) || (cmd.TargetUri != null && (this._manager.IOBehaviour & IOBehaviour.OverwriteNamed) != 0))
{
//Can approximate by saving an empty Graph over the existing Graph
g = new Graph();
g.BaseUri = cmd.TargetUri;
this._manager.SaveGraph(g);
}
else if (this._manager.UpdateSupported && (this._manager.IOBehaviour & IOBehaviour.CanUpdateDeleteTriples) != 0)
{
//Can approximate by loading the Graph and then deleting all Triples from it
g = new NonIndexedGraph();
this._manager.LoadGraph(g, cmd.TargetUri);
this._manager.UpdateGraph(cmd.TargetUri, null, g.Triples);
}
else
{
throw new SparqlUpdateException("Unable to evaluate a DROP command as the underlying store does not provide appropriate IO Behaviour to approximate this command");
}
break;
case ClearMode.All:
case ClearMode.Named:
if (this._manager.ListGraphsSupported)
{
List<Uri> graphs = this._manager.ListGraphs().ToList();
foreach (Uri u in graphs)
{
if (this._manager.DeleteSupported)
{
//If available use DeleteGraph()
this._manager.DeleteGraph(u);
}
else if ((u == null && (this._manager.IOBehaviour & IOBehaviour.OverwriteDefault) != 0) || (u != null && (this._manager.IOBehaviour & IOBehaviour.OverwriteNamed) != 0))
{
//Can approximate by saving an empty Graph over the existing Graph
g = new Graph();
g.BaseUri = u;
this._manager.SaveGraph(g);
}
else if (this._manager.UpdateSupported && (this._manager.IOBehaviour & IOBehaviour.CanUpdateDeleteTriples) != 0)
{
//Can approximate by loading the Graph and then deleting all Triples from it
g = new NonIndexedGraph();
this._manager.LoadGraph(g, u);
this._manager.UpdateGraph(u, null, g.Triples);
}
else
{
throw new SparqlUpdateException("Unable to evaluate a DROP command as the underlying store does not provide appropriate IO Behaviour to approximate this command");
}
}
}
else
{
throw new NotSupportedException("The Generic Update processor does not support this form of the DROP command");
}
break;
}
}
catch
{
if (!cmd.Silent) throw;
}
}
}
/// <summary>
/// Processes a DROP command
/// </summary>
/// <param name="cmd">Drop Command</param>
public void ProcessDropCommand(DropCommand cmd)
{
if (this._manager is IUpdateableGenericIOManager)
{
((IUpdateableGenericIOManager)this._manager).Update(cmd.ToString());
}
else
{
try
{
Graph g;
switch (cmd.Mode)
{
case ClearMode.Graph:
case ClearMode.Default:
g = new Graph();
g.BaseUri = cmd.TargetUri;
this._manager.SaveGraph(g);
break;
case ClearMode.All:
case ClearMode.Named:
if (this._manager.ListGraphsSupported)
{
List<Uri> graphs = this._manager.ListGraphs().ToList();
foreach (Uri u in graphs)
{
g = new Graph();
g.BaseUri = u;
this._manager.SaveGraph(g);
}
}
else
{
throw new NotSupportedException("The Generic Update processor does not support this form of the DROP command");
}
break;
}
}
catch
{
if (!cmd.Silent) throw;
}
}
}