On Thursday 31 January 2008 08:00:29 am Francesc Altet wrote: > A Thursday 31 January 2008, escriguéreu: > > On Thursday 31 January 2008 3:06:58 am Francesc Altet wrote: > > > A Wednesday 30 January 2008, Darren Dale escrigué: > > > > Hello, > > > > > > > > Is it possible to create hard and soft links in pytables files? I > > > > am trying to follow the NeXus format > > > > (http://www.nexusformat.org/Design#NeXus_Data), which uses hard > > > > links. > > > > > > Uh, no, this is in our TODO list, but it is not implemented yet, > > > sorry. > > > > Thanks for the quick response. Are you targeting a particular release > > for this feature? Any ideas about how the public interface interface > > would look? I spent the last two days learning pyrex and how pytables > > is structured (very impressive). Maybe I could take a shot at > > contributing something to your great library. > > Oh, that would be great. Unfortunately, we have not a a particular > deadline in implementing this. Besides, we have not thought yet about > an API for links, but if you are going to take a shot at this, you can > make a proposal and we can give you our feedback. > > Please do not hesitate to ask if you need help or guidance,
It looks like pytables already works well with existing hard links. I wanted to ask though if there might be any caching issues lurking beneath the surface that I should investigate. An example data set is attached (created with the nexus library using Paul Kienzle's python wrapper) where t.root.entry.r8_data is a 5x4 64bit float array and t.root.link.renLinkData is a hard link to the same. I can modify the array following either path, and support looks completely transparent, but I just wanted to be sure. It looks like rounding out support for hard links would simply require adding a new method to File to create the link. I propose something like File.linkNode(self, where, name, curObject) or File.createLink(self, where, name, curObject) The argument list here follows the pattern in createTable. Soft links would take more work. I don't think I would use them myself, so I probably am the wrong person to suggest their implementation. Maybe they would require a new pytables object deriving from Leaf, I don't really know how such a thing should behave. They could be added later, and be created with the same file method through the addition of a linktype kwarg that defaults to hard links. Comments or suggestions? Darren -- Darren S. Dale, Ph.D. Staff Scientist Cornell High Energy Synchrotron Source Cornell University 275 Wilson Lab Rt. 366 & Pine Tree Road Ithaca, NY 14853 [EMAIL PROTECTED] office: (607) 255-3819 fax: (607) 255-9001 http://www.chess.cornell.edu
NXtest.h5
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