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From "Trejkaz (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3013) I wish Lucene query explanations were easier to localise
Date Mon, 04 Apr 2011 23:11:05 GMT
I wish Lucene query explanations were easier to localise
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                 Key: LUCENE-3013
                 URL: https://issues.apache.org/jira/browse/LUCENE-3013
             Project: Lucene - Java
          Issue Type: Wish
          Components: Query/Scoring
            Reporter: Trejkaz


Often users ask us to provide a nice UI to explain why a document matched their query.  Currently
the strings output by Explanation are very advanced, and probably only understandable to those
who have worked on Lucene.  I took a shot at trying to make them friendlier, but it basically
came down to parsing the strings it output and trying to figure out what kind of query was
at each point (the inability to get to a Query from the Explanation is a small part of the
problem here), formulating the result into readable English.  In the end it seems a bit too
hard.

The solution to this could be done in at least two ways:

1. Add getLocalizedSummary() / getLocalizedDescription() method(s) and use resource bundles
internally.  Projects wishing to localise these could add their own resource bundles to the
classpath and/or get them contributed to Lucene.

2. Add subclasses of Explanation with enough methods for callers to interrogate the individual
details of the explanation instead of outputting it as a monolithic string.

I do like the tree structure of explanations a lot (as it resembles the query tree), I just
think there is work to be done splitting up the strings into usable fragments of information.


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