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From "Shalin Shekhar Mangar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1516) DocumentList and Document QueryResponseWriter
Date Wed, 28 Oct 2009 07:06:59 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12770811#action_12770811
] 

Shalin Shekhar Mangar commented on SOLR-1516:
---------------------------------------------

Chris, it is not about whether we want to encourage people to write custom QueryResponseWriters
or not. We had an agreement on where to draw the line for accepting new issues. Had this issue
been opened a few weeks earlier we would have pushed it into 1.4

We can work on this as soon as 1.4 is out. You can either use your internal patched version
or 1.5 trunk once this patch is committed.

> DocumentList and Document QueryResponseWriter
> ---------------------------------------------
>
>                 Key: SOLR-1516
>                 URL: https://issues.apache.org/jira/browse/SOLR-1516
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.3
>         Environment: My MacBook Pro laptop.
>            Reporter: Chris A. Mattmann
>            Priority: Minor
>             Fix For: 1.5
>
>         Attachments: SOLR-1516.Mattmann.101809.patch.txt
>
>
> I tried to implement a custom QueryResponseWriter the other day and was amazed at the
level of unmarshalling and weeding through objects that was necessary just to format the output
o.a.l.Document list. As a user, I wanted to be able to implement either 2 functions:
> * process a document at a time, and format it (for speed/efficiency)
> * process all the documents at once, and format them (in case an aggregate calculation
is necessary for outputting)
> So, I've decided to contribute 2 simple classes that I think are sufficiently generic
and reusable. The first is o.a.s.request.DocumentResponseWriter -- it handles the first bullet
above. The second is o.a.s.request.DocumentListResponseWriter. Both are abstract base classes
and require the user to implement either an #emitDoc function (in the case of bullet 1), or
an #emitDocList function (in the case of bullet 2). Both classes provide an #emitHeader and
#emitFooter function set that handles formatting and output before the Document list is processed.

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