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From Erik Hatcher <>
Subject Re: Sort by Date
Date Wed, 30 Aug 2006 00:22:08 GMT

On Aug 29, 2006, at 3:54 PM, Mag Gam wrote:
> "Index the date". Do you mean, index date, or the document date?
> Could this be in a LIA book?

This is entirely up to you.  What gets indexed is entirely within the  
developers control.  What date do you want indexed?  I presume by  
"document date" you mean a file system document.  But I'm thinking  
more generally here - "documents" in Lucene can be pulled from thin  
air, not just from file system documents.  You are welcome to use the  
file system date.

LIA does have an example of this, which actually makes some tests  
fail if the data file dates are changed. indexes .properties files via the Ant  
<index> task (in contrib/ant in Subversion), and that task indexes  
the file last modified timestamp automatically with each document. has examples of sorting (though not by this  
datestamp, but same idea).


> On 8/29/06, Erik Hatcher <> wrote:
>> On Aug 29, 2006, at 11:50 AM, Mag Gam wrote:
>> > Is it possible to sort results by date of the document?
>> Sure, check out the Sort class and the overloaded  
>> () methods that take a Sort.  You will need to index the date in a
>> sortable way. DateTools provides handy methods for this purpose.
>>        Erik
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