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From Nicolas Lalevée (JIRA) <>
Subject [jira] Commented: (LUCENE-778) Allow overriding a Document
Date Sun, 04 Mar 2007 11:13:50 GMT


Nicolas Lalevée commented on LUCENE-778:

Marker interface is a nice idea, but I think this will make Document handling more painfull.
In my use case this will not be optimal.
In our application, we have a kind of workflow of Document. We have a big/master index which
is holding every data on the system, and then we have specialized index which a part of the
big one. The big one is for making big global queries on the whole data. The specialized are
specialized for the end application. So the workflow is :
* from the raw data, make them as Document and index it in the master index
* for each specialized index :
** do the specific query on the master index
** from the retreived document, redecorate it with specialized indexed field
** index the decorated documents in the specialized index

Here I just have to decorate the Document retrieved form the master index. With incompatible
interfaces, this won't be possible anymore. I will have to reinstanciate a Document each time
and repopulate it.
So why not keep IndexWriter#addDocument(Document), and just change IndexReader#doc(int) to
make it return a kind of DocumentWithOnlyStoredData, with DocumentWithOnlyStoredData extends
Document. (the proposed named is horrible, I know !)

> Allow overriding a Document
> ---------------------------
>                 Key: LUCENE-778
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>    Affects Versions: 2.0.0
>            Reporter: Nicolas Lalevée
>            Priority: Trivial
> In our application, we have some kind of generic API that is handling how we are using
Lucene. The different other applications are using this API with different semantics, and
are using the Lucene fields quite differently. We wrote some usefull functions to do this
mapping. Today, as the Document class cannot be overriden, we are obliged to make a document
wrapper by application, ie some MyAppDocument and MyOtherAppDocument which have a property
holding a real Lucene Document. Then, when MyApp or MyOtherApp want to use our generic lucene
API, we have to "get out" the Lucene document, ie do some genericLuceneAPI.writeDoc(myAppDoc.getLuceneDocument()).
This work fine, but it becomes quite tricky to use the other function of our generic API which
is genericLuceneAPI.writeDocs(Collection<Document> docs).
> I don't know the rational behind making final Document, but removing it will allow more
object-oriented code.

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