Re: Application roles - first steps

[Helge Hess]

On 22.02.2004, at 17:26, Stefan Urbanek wrote:
> > It seems that this doesn't slows down the browser very much; I've  
> > tested with two "big" directories, /dev and /usr/lib, and I get a  
> > factor of 2.1 for /dev and 1.4 for /usr/lib. But, in the normal use,  
> > I don't notice any sensible change.
> What about -namesForPaths: (inspired by -valuesForKeys:(NSArray *)  
> from key-value coding)? With this, you can eliminate lots of  
> inter-process communication.

I would like to recommend to look on subclasses of NGFileManager in  
OGo. Actually we use an EODataSource for exactly that, this even allows  
sorting and filtering and maps very well to exotic kinds of  
filemanagers like IMAP4 or LDAP, which mostly consist of attributes.

Basically like that:
  EODataSource *ds = [fileManager dataSourceAtPath:@"/images"];
  EOFetchSpecification *fspec;

  fspec = [[EOFetchSpecification alloc] init];
  [fspec setQualifier:[EOQualifier  
qualifierWithFormat:@"NSFileExtension='gif'"]];
  [fspec setSortOrderings:[NSArray arrayWithObjects:
          [EOSortOrdering sortOrderingWithKey:@"NSFileSize"  
selector:NSCompareAscending]];
  [ds setFetchSpecification:fspec];

Notably this also maps very well to WebDAV/DASL and of course to  
tableview delegates. And if you are perplexed by the required lines of  
code - of course you can use shortcut methods, but the above mechanism  
as a means of implementation is extremly powerful and generic.

> - metaDataForPath:? :-) or ... metaDataForPaths:? Hmmm ... if there  
> was such method and metadata providers, we can have also 'tags' (or  
> how they are called - those stickers you put on files in Nautilus).

Custom attributes. Supported by the OGo database storage  
(SkyProjectFileManager) and stored in a RDBMS in there allowing for  
extremely fast queries on metadata for a complete filesystem hierarchy.  
Accessible using the mentioned datasource mechanism.

> > So, now I need some suggestion for the name of the daemon and for the  
> > keys to use to get the representations. (Even if I can write a  
> > version returning just the lastPathComponent, for the moment).
> What about keys: WSDisplayName, WSRole, WSTags, WSComments...? I see  
> no reason for daemon for this functionality, Workplace framework is a  
> good place. And you can add appropriate methods to gwremote if you  
> want this for a remote machine.

Actually I would recommend using the WebDAV names which are somewhat  
standard. OGo uses a mapping for that:
   
http://www.opengroupware.org/cvsweb/cvsweb.cgi/OpenGroupware.org/SOPE/ 
skyrix-sope/NGObjWeb/DAVPropMap.plist?rev=1.5&content-type=text/x- 
cvsweb-markup

regards,
  Helge
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