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From ian parkin <iapar...@yahoo.com>
Subject Re: Help with custom sorting - ignoring case on string fields.
Date Wed, 06 Jul 2005 22:54:50 GMT
Thanks for the reply. 

I actually implemented what you suggested - storing lower case fields
- earlier today and it works quite nicely.

I'll certainly review my use of the Field.Text.

IAP

--- Erik Hatcher <erik@ehatchersolutions.com> wrote:

> Ian - I'll look into this issue in more detail as soon as I can,
> but  
> one reasonable approach is to add a special field designed for  
> sorting that has all case normalized to either all upper or all
> lower  
> such that sorting is case insensitive.  Note that Field.Text is not
> a  
> good choice for sorting, as it is highly likely there would be  
> multiple terms for that field which does not work with sorting.  
> See  
> the javadocs for Sort:
> 
>     
> http://lucene.apache.org/java/docs/api/org/apache/lucene/search/ 
> Sort.html
> 
> So given this, a think a special field for sorting that has been  
> lowercased but uses a non-tokenized but indexed field type is the  
> best choice.
> 
> Erik
> 
> On Jul 6, 2005, at 1:46 PM, ian parkin wrote:
> 
> > Hello Folks,
> >
> > Previously, I was using version 1.3 of Lucene that had no complex
> > sorting abilities, so I wrote my own code to do this using a
> TreeMap
> > and Comparator. The sorting was basically lower case comparisons
> of
> > strings with a few extra little tweaks here and there.
> >
> > This past weekend I upgraded to 1.4.3 of Lucene and am looking
> for
> > some help with custom sorting code.
> >
> > My application stores a couple of mixed-case text fields 'author'
> and
> > 'title' as Field.Text and I would like to sort on these fields in
> a
> > case insensitive manner.
> >
> > I have been looking at the DistanceComparatorSource example in
> the
> > 'Lucene In Action' book and have been trying to adapt that to my
> > humble needs, but so far no luck. For some reason, I just can't
> get
> > my head round the example in order to tailor it to my needs.
> >
> > Does anyone have any example ComparatorSource code that sorts
> strings
> > ignoring the case ?
> >
> > Thanks
> >
> > IAP
> >
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