The problem with the Lucene indexer really lies in the Document
creation. A document, as best I can tell, is a sort of
map-representation (in the form [field: value]) of the object to be
indexed. Creating such a Document requrires the Document Builder to
somehow know about the internals of the object to be indexed. There
seem to be a few solutions:
1. For any object to be indexed, the object must implement some
Indexable interface with a method like getObjectAsDocument or
getObjectAsPropertyMap or something.
2. For any object to be indexed, the object must adhere to Bean
standards and the Document Builder simply uses BeanUtils to do the
indexing.
3. Use the strategy pattern and have a DocumentBuilderStrategy
implementation for each and every class to be indexed.
4. Have the document builder refer to some external mappings file for
each class.
Of these:
1 - unwieldy
2 - breaks encapsulation
3 - balloons the number of classes required
4 - a pain in the neck to continually update mappings files to match
class changes
... and that's where xdoclet comes in. By adding @lucene tags to a
class and having a <lucenedoclet/> task, we can have Ant auto-generate
these mappings when we update our class.
an example of tag usage:
[com/sun/petstore/Dog.java]:
/**
* @hibernate class table="dogs"
* @lucene class
*/
class Dog {
...
/**
* @hibernate property column="name"
* @lucene field name="name"
*/
public String getName() {
return this.name;
}
}
this would generate, via ant, some sort of xml file, like:
[com/sun/petstore/Dog.lcm.xml]:
<lucene-mapping class="com.sun.petstore.Dog">
<field name="name" type="java.lang.String" />
</lucene-mapping>
we then create a generic indexer which looks for .lcm.xml files and
uses them to create fields for a supplied collection of objects to be
indexed.
In summary, I think I'm proposing the latter of your two options, but
my discrete-math terminology is a bit lacking.
-James
On Mon, 22 Nov 2004 14:48:20 -0500, Erik Hatcher
<[EMAIL PROTECTED]> wrote:
> As an active Lucene committer, (former) XDoclet user (and committer),
> and co-author of the upcoming Lucene in Action book -
> http://www.manning.com/hatcher2 - I'm intrigued by this.
>
> I'm not following what you plan on indexing with Lucene though. Are
> you proposing to index the tag values as fields? Or are you proposing
> some type of object graph indexing with the mappings of object paths
> encoded as XDoclet tags?
>
> Erik
>
>
>
> On Nov 22, 2004, at 12:25 PM, James Rosen wrote:
>
> > While reading Ara Abrahamian's book on open-source development, I came
> > across a section on using xml config files to do lucene mappings. I
> > thought this would be a perfect addition to xdoclet. I would be happy
> > to write the following, but am new to sourceforge and will need a
> > little help getting started.
> > My proposal includes:
> > -a <lucenedoclet/>
> > [EMAIL PROTECTED] tags
> > -an addition to the lucene library (I realize this is not your domain,
> > so it will have to be an add-on for now) allowing the indexers and
> > document-builders to use .lcm.xml files
> >
> > If this project is of interest to you, please post to the list.
> >
> > -James
> >
> > (Attached: response from Mr. Abrahamian)
> > PS - moderators can ignore my previous message - I didn't realize it
> > was a member's-only list, and have subsequently joined to resend the
> > message.
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: Ara Abrahamian <[EMAIL PROTECTED]>
> > Date: Mon, 22 Nov 2004 18:47:49 +0330
> > Subject: RE: lucene tags
> > To: James <[EMAIL PROTECTED]>
> >
> > Hi,
> >
> > I'm not an active contributor to xdoclet any more. I don't know what's
> > going
> > on in there these days :-) So, please send an email to xdoclet's
> > xdoclet-devel mailing list describing what you are going to do with the
> > @lucene tags and the lucenedoclet module. I'm sure you'll get a lot of
> > help
> > from the team :-)
> >
> > Ara.
> >
> >> -----Original Message-----
> >> From: Nobody [mailto:[EMAIL PROTECTED] On Behalf Of James
> >> Sent: Sunday, November 21, 2004 11:11 PM
> >> To: [EMAIL PROTECTED]
> >> Subject: lucene tags
> >>
> >> Message body follows:
> >>
> >> I have been reading your open source development book, and
> >> would like to offer my help to the project.
> >> The Lucene class-config mapping files you mention in chapter
> >> 18 are a perfect fit for a new <lucenedoclet/> task and some
> >> @lucene tags. I am happy to write these, but am new to
> >> SourceForge and don't really know where to begin
> >> contributing. Please advise if this would be a welcome
> >> addition.
> >> -James
> >>
> >> --
> >> This message has been sent to you, a registered SourceForge.net user,
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> >> using the messaging facility of SourceForge.net at:
> >> https://sourceforge.net/sendmessage.php?touser=1163582
> >
> >
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