public static DeleteObjectsCommand Evaluate(IEngine engine, Command command)
{
if (command.Parameters.Count < 2)
{
return(null);
}
if (command.Parameters[0].Name.ToLower() != "delete")
{
return(null);
}
if (command.Parameters[0].Value != null)
{
return(null);
}
string name = command.Parameters[1].Name;
if (string.IsNullOrEmpty(name))
{
return(null);
}
ISchemaService schemaService = engine.GetService <ISchemaService>();
if (!schemaService.HasClass(name))
{
return(null);
}
DeleteObjectsCommand deleteObjectsCommand = new DeleteObjectsCommand(name);
EvaluateMatch(command.Parameters[1].Value, name, schemaService, deleteObjectsCommand);
if (command.Parameters.Count > 2)
{
switch (command.Parameters[2].Name.ToLower())
{
case "match":
case "where":
EvaluateMatch(command.Parameters[2].Value, name, schemaService, deleteObjectsCommand);
break;
case "query":
if (command.Parameters[2].Value != null)
{
deleteObjectsCommand.Where = command.Parameters[2].Value.ToString();
}
break;
}
}
return(deleteObjectsCommand);
}
public static DeleteObjectsCommand Evaluate(IEngine engine, Command command)
{
if (command.Parameters.Count < 2)
return null;
if (command.Parameters[0].Name.ToLower() != "delete")
return null;
if (command.Parameters[0].Value != null)
return null;
string name = command.Parameters[1].Name;
if (string.IsNullOrEmpty(name))
return null;
ISchemaService schemaService = engine.GetService<ISchemaService>();
if (!schemaService.HasClass(name))
return null;
DeleteObjectsCommand deleteObjectsCommand = new DeleteObjectsCommand(name);
EvaluateMatch(command.Parameters[1].Value, name, schemaService, deleteObjectsCommand);
if (command.Parameters.Count > 2)
{
switch (command.Parameters[2].Name.ToLower())
{
case "match":
case "where":
EvaluateMatch(command.Parameters[2].Value, name, schemaService, deleteObjectsCommand);
break;
case "query":
if (command.Parameters[2].Value != null)
deleteObjectsCommand.Where = command.Parameters[2].Value.ToString();
break;
}
}
return deleteObjectsCommand;
}
public void OnExecuting(object sender, ExecutionCancelEventArgs e)
{
IEngine engine = sender as IEngine;
DeleteObjectsCommand deleteObjectsCommand = DeleteObjectsCommand.Evaluate(engine, e.Command);
if (deleteObjectsCommand == null)
{
return;
}
IObjectService objectService = engine.GetService <IObjectService>();
IDatabaseService databaseService = engine.GetService <IDatabaseService>();
databaseService.EnsureTransaction();
Type type = objectService.GetTypeByName(deleteObjectsCommand.ClassName);
IList objects = null;
if (!string.IsNullOrEmpty(deleteObjectsCommand.Where))
{
objects = objectService.GetObjects(type, deleteObjectsCommand.Where);
}
else
{
objects = objectService.GetObjects(type, deleteObjectsCommand.Match);
}
if (objects != null)
{
foreach (object obj in objects)
{
objectService.DeleteObject(obj);
}
}
}
private static void EvaluateMatch(object possibleMatch, string name, ISchemaService schemaService, DeleteObjectsCommand deleteObjectsCommand)
{
IList<Parameter> match = possibleMatch as IList<Parameter>;
if (match != null)
{
foreach (Parameter parameter in match)
{
if (schemaService.HasProperty(name, parameter.Name))
{
deleteObjectsCommand.Match[parameter.Name] = parameter.Value;
}
}
}
}
private static void EvaluateMatch(object possibleMatch, string name, ISchemaService schemaService, DeleteObjectsCommand deleteObjectsCommand)
{
IList <Parameter> match = possibleMatch as IList <Parameter>;
if (match != null)
{
foreach (Parameter parameter in match)
{
if (schemaService.HasProperty(name, parameter.Name))
{
deleteObjectsCommand.Match[parameter.Name] = parameter.Value;
}
}
}
}