/// <summary>
/// Open an existing tag
/// </summary>
/// <param name="name">name of the tag</param>
/// <param name="tag_group">group tag of the tag</param>
/// <param name="flags">special flags to use when opening</param>
/// <returns>
/// The tag_index handle associated with the <see cref="TagManager"/> used to load the tag, or <see cref="Blam.DatumIndex.Null"/> if this operations fails
/// </returns>
/// <remarks>
/// Will return existing handles if tag is already open.
/// If <paramref name="tag_group"/> is setup to be ignored, we return <see cref="kSkipped"/>.
/// </remarks>
public Blam.DatumIndex Open(string name, TagInterface.TagGroup tag_group, uint flags)
{
// HACK: Halo1 PC uses gbx's variant of the model tag
if (Engine == BlamVersion.Halo1_CE && tag_group == Blam.Halo1.TagGroups.mode)
{
tag_group = Blam.Halo1.TagGroups.mod2;
}
if (Ignore(tag_group)) return kSkipped;
// Does this tag even exist on disk?
string path = string.Format("{0}.{1}", Path.Combine(directory, name), tag_group.Name);
if (!Exists(path)) return kMissing;
// Is this tag already loaded? if so, reuse handle
Blam.DatumIndex di = IsLoaded(name, tag_group);
if (di != Blam.DatumIndex.Null)
{
Array.IncrementReference(di);
return di;
}
// If the tag had errors, don't try loading it again.
// Note that valid tags can exist in the error database since they act as root tags for problem
// tags, but since we call [IsLoaded] above this it will catch any valid cases
if (ErrorDatabaseContains(name, tag_group))
return Blam.DatumIndex.Null;
#region Initialize tag manager
TagManager tm = new TagManager(this);
tm.ReferenceName = refManager.Add(tm, tag_group, name);
tm.Flags.Add(flags);
tm.Manage(tag_group);
tm.TagIndex = di = Array.Add(tm); // in order to read the tag, the tag index must be setup first (due how TagManager.Path is setup)
#endregion
#region Stream tag manager
tm.OpenForRead();
try { tm.Read(); }
catch (TagInterface.Exceptions.InvalidVersion /*ex_version*/)
{
//indexTrace.WriteLine("Tag Index: Failed to open tag from disk (invalid\\unhandled version): {0}{1}{2}", path, Program.NewLine, ex_version);
di = kVersionInvalid;
}
catch (Exception ex)
{
indexTrace.WriteLine("Tag Index: Failed to open tag from disk: {0}{1}{2}", path, Program.NewLine, ex);
di = Blam.DatumIndex.Null;
}
finally { tm.Close(); }
if(di != tm.TagIndex)
{
Array.Remove(tm.TagIndex);
ErrorDatabaseAddLocalHack(name, tag_group);
return di;
}
#endregion
ErrorDatabaseUpdate(tm);
base.OnEventOpen(new TagIndexEventArgs(this, tm));
return tm.TagIndex;
}
