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From jian chen <chenjian1...@gmail.com>
Subject Re: Books about Lucene?
Date Fri, 26 Aug 2005 21:19:21 GMT
Hi, Erik,

Thanks. I think I will dig out my changes against Lucene 1.2 and then let 
you know what in detail they are. It will take some days though.

Thanks,

Jian


On 8/26/05, Erik Hatcher <erik@ehatchersolutions.com> wrote:
> 
> It's absolutely permissible. Lucene is licensed with the Apache
> Software License, which is quite liberal with what you can do with
> the code.
> 
> If the demand for a 1.2-compatible version of Lucene is enough that
> there some folks willing to develop it and maintain it, I would be
> happy to have it within Lucene's own codebase. I think keeping as
> much of the code that can be identical as possible is important, and
> if it can be demonstrated that switching Lucene's trunk codebase in
> parts to be 1.2 compatible is not detrimental to performance or
> resource usage of Lucene then we'd strongly consider making those
> changes.
> 
> Erik
> 
> 
> On Aug 26, 2005, at 3:12 PM, jian chen wrote:
> 
> > Hi, Erik,
> >
> > I some time ago played with the Lucene 1.2 source code and made some
> > modifications to it, trying to add my own ranking algorithm. I am
> > not sure
> > if Licence wise, it is permissible to modify the earlier source
> > code, also
> > if it is allowed to put the modified version or the description of
> > what I
> > have done on wiki?
> >
> > Thanks for your reply.
> >
> > Jian
> >
> >
> > On 8/26/05, Erik Hatcher <erik@ehatchersolutions.com> wrote:
> >
> >>
> >> I appreciate the vote of confidence on this, but I am not afraid to
> >> admit that I do not consider myself an expert on the deep innards of
> >> Lucene. I understand the concepts, and a bit of the internals, but I
> >> certainly do not live up to the hype you just bestowed upon me.
> >> *blush*
> >>
> >> Regarding JDK 1.2 - I came to Java at 1.3, and have never used a JDK
> >> earlier than that. All the apps I build now are currently on JDK 1.5
> >> (err... 5.0). I do not currently know what would be involved in
> >> running Lucene on a 1.2 VM. The first question to ask is whether an
> >> earlier version of Lucene is sufficient for the needs of those
> >> constrained to JDK 1.2. If not, then we move forward to defining
> >> what needs to be changed - a simple compilation of the trunk source
> >> code with a 1.2 VM would give away most of the details.
> >>
> >> As with open source in general, it is about scratching our own
> >> itches. If you're using Lucene (or need to use Lucene) in a 1.2 VM,
> >> that is your itch to scratch and I would happily support your efforts
> >> in some way in documenting this (either on the wiki or embedded in
> >> Lucene's own built-in documentation) or in providing an alternative
> >> version of Lucene that is suitable for 1.2 (perhaps by having
> >> alternative code in a separate directory within our code
> >> repository). If you create such documentation, perhaps you'd be
> >> willing to donate it with full attribution to the 2nd edition of
> >> LIA. But please don't wait for me to do it, as it really is not
> >> something I need personally for any project - all my projects are at
> >> JDK 1.5 currently.
> >>
> >> Erik
> >>
> >>
> >
> 
> 
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