New Packager Class

[ianthe]

UoE Requirement Dep 12

First thing, read this - https://en.wikipedia.org/wiki/BagIt

The current Bagit Java library has a number of problems. It might be possible to download the code and edit it, but honestly I think it would be much easier to start from scratch as the existing code is extremely complicated.

The problems we need to fix are...

• The current code builds the manifest in memory, so for a directory with a lot of files it runs out of memory.

• maintain empty directories

• maintain symbolic links (rather than resolving & duplicating)

• maintain exact file names

  • Will need a way of handling the fact that there aren't checksums for empty directories and symbolic links

Packager interface so can choose which to use

• methods in Deposit:
  • Packager.createBag(bagDir);
  • Packager.addMetadata(bagDir, depositMetadata, vaultMetadata, fileTypeMetadata, externalMetadata);
  • Packager.extractMetadata(bagDir, metaDir);