highlighting with Lucene

[Cyril Vidal <cy...@planetexml.com>]

Hi,

 I have a question about using highlighting with Lucene.
What I only want to do:
start from an xml document, by example:
<flower>
This is a beautiful yellow flower
</flower>

that I have first indexed in Lucene's index.

 And when making a query such : flower:yellow
get an XML document from the following form:

<flower>
This is a beautiful <em>yellow</em> flower
</flower>

I don't want ANYsearch function, but just gain benefit from the highlight
function in Lucene.

At first glance, I think it's quite a easy task:
1°) Download the java classes from Maik Screiber, make the few modifications
on Lucene's code.
2°) Compile the Highlight Transformer java class from article
www.cocooncenter.org
3°) Write my sitemap, as written in the same article:

<map:transformer
      logger="sitemap.transformer.highlight"
      name="highlight"
   pool-grow="2" pool-max="16" pool-min="2"
   src="nl.datagram.cocoon.transformation.HighlightTransformer"/>

<map:match pattern="flora">
    <map:generate type="file"
        src="flora.xml"/>
    <map:transform type="highlight" />
        <map:serialize/>
  </map:match>

And when pointing to the url:
http://localhost:8080/cocoon/flora?query=flower:yellow

I should have the desired document:
<flower>
This is a beautiful <em>yellow</em> flower
</flower>

Is this right, or highlighting is a much more difficult task?

Thanks for your response,
Cyril.




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RE: highlighting with Lucene

[Hugo Burm <hu...@xs4all.nl>]

Hi,

The steps you describe below are correct. But it may not be as easy as you
may wish.

Some points:
- The Cocooncenter article was written before Lucene support was integrated
in Cocoon.
Because of this:
- I did not use the indexer integrated in Cocoon, but used my own classes to
index xml files.
- I used my own xsp-logicsheet to pass the query to Lucene and get the
results back.
(you can download the classes and xsp sheet from the Cocooncenter site)

- The highlight transformer has to know about the terms of the query. If I
remember correctly, my xsp page creates a <query> tag out of the request,
and passes that to the transformer.

So the answer to your question: if you follow the article step by step, it
may work. If you want to mix with Lucene functionality integrated in Cocoon,
it will not.

Off course this is a bad thing. It should work as you describe below. So I
have to change this Tranformer in order to make it fit better in the current
Cocoon/Lucene environment. And meanwhile hope that the modifications of Maik
Schreiber are incorporated into the current branch of Lucene, so you could
skip recompiling Lucene

Hugo

-----Original Message-----
From: Cyril Vidal [mailto:cyril@planetexml.com]
Sent: Monday, February 10, 2003 1:21 PM
To: hugob@xs4all.nl; cocoon-users@xml.apache.org
Subject: highlighting with Lucene


Hi,

 I have a question about using highlighting with Lucene.
What I only want to do:
start from an xml document, by example:
<flower>
This is a beautiful yellow flower
</flower>

that I have first indexed in Lucene's index.

 And when making a query such : flower:yellow
get an XML document from the following form:

<flower>
This is a beautiful <em>yellow</em> flower
</flower>

I don't want ANYsearch function, but just gain benefit from the highlight
function in Lucene.

At first glance, I think it's quite a easy task:
1°) Download the java classes from Maik Screiber, make the few modifications
on Lucene's code.
2°) Compile the Highlight Transformer java class from article
www.cocooncenter.org
3°) Write my sitemap, as written in the same article:

<map:transformer
      logger="sitemap.transformer.highlight"
      name="highlight"
   pool-grow="2" pool-max="16" pool-min="2"
   src="nl.datagram.cocoon.transformation.HighlightTransformer"/>

<map:match pattern="flora">
    <map:generate type="file"
        src="flora.xml"/>
    <map:transform type="highlight" />
        <map:serialize/>
  </map:match>

And when pointing to the url:
http://localhost:8080/cocoon/flora?query=flower:yellow

I should have the desired document:
<flower>
This is a beautiful <em>yellow</em> flower
</flower>

Is this right, or highlighting is a much more difficult task?

Thanks for your response,
Cyril.




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