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From Fabiano Nunes <fabi...@nunes.me>
Subject Re: Retrieving payload attribute in highlighter
Date Wed, 01 Dec 2010 12:09:48 GMT
Thanks Erick. This solved my problem. Now I can retrieve payloads using on
the fly readers.



On Tue, Nov 30, 2010 at 6:49 PM, Erick Erickson <erickerickson@gmail.com>wrote:

> Warning, ignorance alert. I'm not all that up on the guts of this one.
>
> But take a look at MemoryIndex, there's an example there. The gist
> is that you create a MemoryIndex on the fly and index the doc in question
> into it, then you can get the IndexReader from the IndexSearcher associated
> with the MemoryIndex. All this is similar to how Highlighter works, and it
> looks like you have access to the original input?
>
> Now, this is largely a guess, so don't waste time if I'm really off base
> with
> this.
>
> Best
> Erick
>
> On Tue, Nov 30, 2010 at 2:16 PM, Fabiano Nunes <fabiano@nunes.me> wrote:
>
> > Ok. I'll go ahead.
> > Just one more thing: the apidocs warning says "(...) IndexReader should
> > only
> > contain doc of interest, best to use MemoryIndex (..)".
> > How can I build a reader with a subset of docs?
> >
> > Thanks!
> >
> > On Tue, Nov 30, 2010 at 2:31 PM, Erick Erickson <erickerickson@gmail.com
> > >wrote:
> >
> > > That's the Lucene developers' way of saying "we don't guarantee
> backwards
> > > compatibility".
> > >
> > > The devs go to great lengths to honor the contract of not changing
> public
> > > APIs without
> > > going through a deprecation process, which causes quite a lot of work.
> > But
> > > that conflicts
> > > with the desirable process of having real-live users get a look at new
> > > code.
> > > So this
> > > warning merely says "the next compilation of Lucene may have a
> different
> > > API, so don't
> > > blame us if you have to recompile against a new jar". OK, I've played
> > > pretty
> > > loose with
> > > the words, but that's the intent.
> > >
> > > By and large, though, the functionality will be there in new versions,
> > but
> > > you may have
> > > to change the calls you use if you get new jars.
> > >
> > > I'd go ahead and use the class/method with confidence that something
> > > similar
> > > will be there
> > > in the future, but you may have to recompile if you get new jars.
> > >
> > > Best
> > > Erick
> > >
> > > On Tue, Nov 30, 2010 at 11:06 AM, Fabiano Nunes <fabiano@nunes.me>
> > wrote:
> > >
> > > > I've figured out the PayloadSpanUtil class. It's exactly what I'm
> > > > expecting.
> > > > But, I'm concerned about the warning message in API docs (indeed, I
> > think
> > > I
> > > > dont understand it). There is any other approach? Can I have the same
> > > > results retrieving the termPositions without performance issues?
> > > >
> > > > Thanks.
> > > >
> > > > On Tue, Nov 30, 2010 at 1:20 PM, Fabiano Nunes <fabiano@nunes.me>
> > wrote:
> > > >
> > > > > Hello,
> > > > > I'm trying to retrieve payloads from the highlighteds terms by
> > > > Highlighter
> > > > > class. In my tests, all terms returned from Highlighter has null
as
> > > > payload.
> > > > > Example:
> > > > >
> > > > > Highlighter h = new Highlighter(new Formatter() {
> > > > > public String highlightTerm(String originalText, TokenGroup
> > tokenGroup)
> > > {
> > > > > Token token = tokenGroup.getToken(0);
> > > > >  Payload payload = token.getPayload();
> > > > >  assertNotNull(payload); // <---------------- payload is always
> null
> > > > >  return originalText;
> > > > > }
> > > > > }, scorer);
> > > > >
> > > > > It seems that Highlighter removes payload attribute from all terms
> > > before
> > > > > creating its TokenGroup.
> > > > > How can I preserve it?
> > > > >
> > > > > Thanks.
> > > > >
> > > >
> > >
> >
>

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