[Neo] Newbie IndexService question: How is equality defined between values in the index

Mattias Persson mattias at neotechnology.com
Fri Feb 12 15:08:50 CET 2010


Yep, it's already been added in javadoc in the trunk!

2010/2/12 Thomas Andersson <greddbullen at gmail.com>:
> Hi,
>
> Thanks for the quick reply! That works beautifully for us.
>
> Maybe I could suggest that the javadoc be updated to reflect this?
> Because there's a world of difference between comparing using equals
> and toString().
>
> Best regards,
> Thomas
>
> On Fri, Feb 12, 2010 at 11:43 AM, Mattias Persson
> <mattias at neotechnology.com> wrote:
>> Yep the answer is simple, it does a .toString() on the object and
>> stores that string (since Lucene handles only strings as values). And
>> when calling getNodes() it matches your suppliedValue.toString() with
>> the values stored in lucene.
>>
>> Are you satisfied with that answer? I can imagine that in some remote
>> case this (string conversion) could be a problem, but it works great
>> for the majority of users using it.
>>
>> 2010/2/12 Thomas Andersson <greddbullen at gmail.com>:
>>> Hi,
>>>
>>> I have just started to use neo4j and so far I really like it, but I
>>> have a question about the IndexService interface.
>>>
>>> When indexing you provide a key of type String and a value of type Object.
>>>
>>> When doing lookup, you provide a value Object to look for to match
>>> with the indexed value object. How is the matching done? Is there a
>>> comparison of value objects using Object.equals, or what constitutes a
>>> match?
>>>
>>> Also, since the index can be persisted to the file system, the value
>>> objects must also be persisted. I am a little confused that there is
>>> no requirement that the value object must be serializable or something
>>> like that.
>>>
>>> Any thoughts on this?
>>>
>>> Best Regards,
>>> Thomas
>>> _______________________________________________
>>> Neo mailing list
>>> User at lists.neo4j.org
>>> https://lists.neo4j.org/mailman/listinfo/user
>>>
>>
>>
>>
>> --
>> Mattias Persson, [mattias at neotechnology.com]
>> Neo Technology, www.neotechnology.com
>> _______________________________________________
>> Neo mailing list
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>>
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>



-- 
Mattias Persson, [mattias at neotechnology.com]
Neo Technology, www.neotechnology.com


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