Steven Bethard created CTAKES-217:
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Summary: create a tool for "diff"-ing two CASes
Key: CTAKES-217
URL: https://issues.apache.org/jira/browse/CTAKES-217
Project: cTAKES
Issue Type: New Feature
Reporter: Steven Bethard
It would be handy to be able to easily get a "diff" of two CASes. Some
possibilities:
(1) Just diff the XMIs. This doesn't work very well because the IDs are
typically different in different XMIs generated from the same annotations.
(2) Output all annotations, using their .toString(), and diff that file using a
standard diff algorithm. This might mostly work if we could guarantee a
consistent ordering of the annotations in the CAS. (That's easy to do for
Annotations, but not always possible for TOPs.) But some things aren't
displayed in the .toString(), e.g. the values inside FSArrays and FSLists.
In r1504269, I added CompareFeatureStructures which isn't either of these, but
is a bit closer to (2). It sorts annotations by offset (and for TOPs, looks
through their features to find offsets), and then compares each pair of
FeatureStructures by walking the tree of their features. I'm mostly happy with
how it handles the comparison of two FeatureStructures (though .toString() is a
bit hacky).
The main issue is that it doesn't really do anything useful if you have
different numbers of annotations in the two CASes. It just prints a message
saying that the numbers are different. Instead, it should be able to identify
insertions and deletions of annotations. Probably there's a way to do this with
java-diff-utils, though I wasn't able to figure one out on my first attempt.
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