internal void Rename(Db4objects.Db4o.Rename a_rename)
{
Collection4 renameCollection = Rename();
if (renameCollection == null)
{
renameCollection = new Collection4();
_config.Put(RenameKey, renameCollection);
}
renameCollection.Add(a_rename);
}
private bool AlreadyApplied(Rename ren)
{
return QueryByExample(SystemTransaction(), ren).Count != 0;
}
private IObjectSet QueryInverseRenames(Rename ren)
{
return QueryByExample(SystemTransaction(), Renames.ForInverseQBE(ren));
}
private void DeleteInverseRenames(Rename rename)
{
// delete all that rename from the new name
// to allow future backswitching
IObjectSet inverseRenames = QueryInverseRenames(rename);
while (inverseRenames.HasNext())
{
Delete(SystemTransaction(), inverseRenames.Next());
}
}
private void CommitRenameFor(Rename rename, ClassMetadata classMetadata)
{
SetDirtyInSystemTransaction(classMetadata);
LogMsg(8, rename.rFrom + " to " + rename.rTo);
DeleteInverseRenames(rename);
// store the rename, so we only do it once
Store(SystemTransaction(), rename);
}
private bool ApplyFieldRename(Rename ren)
{
ClassMetadata parentClass = _classCollection.GetClassMetadata(ren.rClass);
if (parentClass == null)
{
return false;
}
if (!parentClass.RenameField(ren.rFrom, ren.rTo))
{
return false;
}
CommitRenameFor(ren, parentClass);
return true;
}
private bool ApplyClassRename(Rename ren)
{
ClassMetadata classToRename = _classCollection.GetClassMetadata(ren.rFrom);
if (classToRename == null)
{
return false;
}
ClassMetadata existing = _classCollection.GetClassMetadata(ren.rTo);
if (existing != null)
{
LogMsg(9, "class " + ren.rTo);
return false;
}
classToRename.SetName(ren.rTo);
CommitRenameFor(ren, classToRename);
return true;
}
private bool ApplyRename(Rename ren)
{
if (ren.IsField())
{
return ApplyFieldRename(ren);
}
return ApplyClassRename(ren);
}
public static Rename ForInverseQBE(Rename ren)
{
return new Rename(ren.rClass, null, ren.rFrom);
}
