/// <summary>
/// Resets this enumerator preparing it for a fresh new execution.
/// </summary>
public void Reset()
{
try { if (_Enumerator != null)
{
_Enumerator.Dispose();
}
}
catch { }
try { if (_CoreCommand != null)
{
_CoreCommand.Dispose();
}
}
catch { }
if (_Indented)
{
DebugEx.Unindent();
}
_Indented = false;
_Enumerator = null;
_CoreCommand = null;
_Current = null;
}
/// <summary>
/// Invoked when disposing or finalizing this instance.
/// </summary>
/// <param name="disposing">True if the object is being disposed, false otherwise.</param>
protected virtual void OnDispose(bool disposing)
{
if (disposing)
{
try { Reset(); }
catch { }
}
_Enumerator = null;
_CoreCommand = null;
_Command = null;
_Current = null;
_IsDisposed = true;
}
/// <summary>
/// Executes the command if it has not been executed yet in this instance. Returns true
/// if a new record is available, or false otherwise.
/// </summary>
public bool MoveNext()
{
if (IsDisposed)
{
throw new ObjectDisposedException(this.ToString());
}
try
{
if (_CoreCommand == null) // Preparing iterations...
{
_CoreCommand = _Command.GenerateCoreCommand(); if (_CoreCommand == null)
{
throw new CannotCreateException("Cannot create a core query command for this '{0}'.".FormatWith(this));
}
_Enumerator = _CoreCommand.GetEnumerator(); if (_Enumerator == null)
{
throw new CannotCreateException("Cannot create a core query enumerator for this '{0}'.".FormatWith(this));
}
DebugEx.IndentWriteLine("\n- Query: entering '{0}'...".FormatWith(_Command.TraceString()));
_Indented = true;
}
_Current = null; bool r = _Enumerator.MoveNext(); if (r) // Current iteration...
{
var record = _Enumerator.CurrentRecord;
var disposable = true;
var map = _Command.Map;
lock (map.Repository.MasterLock)
{
if (map.TrackEntities)
{
var node = map.MetaEntities.FindNode(record); if (node != null)
{
foreach (var meta in node)
{
T obj = (T)meta.Entity; if (obj == null)
{
DebugEx.IndentWriteLine("\n- Query: meta invalid '{0}'.".FormatWith(meta));
DebugEx.Unindent();
continue;
}
if (_Current == null)
{
_Current = obj;
}
else
if (map.ProxyType != null &&
map.ProxyType != _Current.GetType() &&
map.ProxyType == obj.GetType())
{
_Current = obj;
}
if (meta.Completed)
{
DebugEx.IndentWriteLine("\n- Query: meta completed '{0}'.".FormatWith(meta));
DebugEx.Unindent();
continue;
}
DebugEx.IndentWriteLine("\n- Query: hydrating meta '{0}'.".FormatWith(meta));
meta.Record = record.Clone();
map.LoadEntity(meta.Record, obj);
map.CompleteMembers(meta);
DebugEx.Unindent();
}
}
}
if (_Current == null)
{
DebugEx.IndentWriteLine("\n- Query: new meta '{0}({1})'.".FormatWith(map.EntityType.EasyName(), record));
_Current = map.NewEntity(); var meta = MetaEntity.Locate(_Current);
meta.Record = record; disposable = false;
meta.UberMap = map; if (map.TrackEntities)
{
map.MetaEntities.Add(meta);
}
map.LoadEntity(meta.Record, _Current);
map.CompleteMembers(meta);
DebugEx.Unindent();
}
}
if (disposable)
{
record.Dispose();
}
}
else
{
Reset();
}
return(r);
}
catch
{
try { Dispose(); }
catch { }
throw;
}
}
