When adding a Bitstream to a Bundle, the 'bitstream_order' is always set to the
'sequence_id'
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Key: DS-1122
URL: https://jira.duraspace.org/browse/DS-1122
Project: DSpace
Issue Type: Bug
Components: DSpace API
Affects Versions: 1.8.1, 1.8.0
Reporter: Tim Donohue
Assignee: Tim Donohue
Fix For: 1.8.2
Attachments: Bundle.patch
Currently, in the Bundle.addBitstream() method the 'bitstream_order' setting is
always set to the same value as the 'sequence_id'.
This makes a large assumption that these two fields should always be equal for
newly created bitstreams.
However, in scenarios where you are restoring an Item and its Bitstreams (like
via AIP Backup & Restore), this assumption falls flat. In 'restore' scenarios,
it's very possible you may want to restore the 'sequence_id' as 2 while the
'bitstream_order' should be 1. Unfortunately, this becomes problematic, as the
'addBitstream()' method will always assume bitstream_order=sequence_id.
My proposal is to instead implement Bundle.addBitstream() so that it is always
*appending* the newly added bitstream to the end of the current list of
Bitstreams. So, instead it should set:
bitstream_order = bitstreams.size()
This will work fine for 'restore' scenarios, as Bitstreams are always restored
in order, so the bitstream_order may be restored to a different value to the
sequence_id.
A proposed patch to the Bundle class is attached. I've done some minimal
testing so far, but it seems stable. I have verified that with this patch in
place, I can now restore *both* an Item's bitstream_order and sequence_id to
different values (as necessary), via the AIP Backup & Restore tools.
I'd appreciate feedback on this approach.
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