From the Javadoc for IndexReader.....
Returns one greater than the largest possible document number. This may be used to, e.g., determine how big to allocate an array which will have an element for every document number in an index. Isn't that what you're wondering about? Erick On 5/24/07, Carlos Pita <[EMAIL PROTECTED]> wrote:
That's no problem, I can regenerate my entire extra data structure upon periodic index optimization. That way the array size will be about the size of the index. What I find more difficult is to know the id of the last added/removed document. I need it to update the in-mem structure upon more fine-grained index changes. Any ideas? TIA. Cheers, Carlos On 5/24/07, Erick Erickson <[EMAIL PROTECTED]> wrote: > > Document IDs will be re-utilized, after, say, optimization. > One consequence of this is that optimization will change the IDs > of *existing* documents. > > You're right, that numdocs may well be shorter than maxdocs. > That's what I get for reading quickly... > > Best > Erick > > On 5/24/07, Carlos Pita <[EMAIL PROTECTED]> wrote: > > > > > > > > > > > No. It will always be at least as large as the total documents. But > that > > > will also count deleted documents. > > > > > > > > Do you mean that deleted document ids won't be reutilized, so the index > > maxDoc will grow more and more with time? Isn't there any way to > compress > > the range? It seems strange to me, considering that an example in the > book > > suggests to use the document id as an array index for an array of maxDoc > > elements. > > > > Cheers, > > Carlos > > > > Why wouldn't numdocs serve? > > > > > > Best > > > Erick > > > > > > > > > The motivation of this question is that I want to associate some info > to > > > > each document in the index, and in order to access this additional > > data > > > in > > > > O(1) I would like to do this through an array indexing. But the > array > > > size > > > > shouldn't be a lot greater than the total number of documents. I see > > > that > > > > something similar is done in the example of section 6.1 of Lucene in > > > > Action, > > > > but for sorting purposes, which is not my case. > > > > > > > > Related to this: how can update my array of extra data when > documents > > > are > > > > added/removed to/from the index? Is there any feedback mechanism by > > > means > > > > of > > > > callbacks or event handlers? > > > > > > > > Thank you in advance. > > > > Regards, > > > > Carlos > > > > > > > > > >
