Really thanks Karsten and Ian Lea!! You gave me a very useful solutions I'm going to try the last one of Karsten:
Because you easly can use lucene with 1 field and 365 different tokens (20080101, 20080102, ...20081231). even if the solution of Ian Lea seems to be a very good one and I'll try it too. Thanks a lot!I really appreciate your help luther Karsten F. wrote: > > Hi Luther, > > your question: > "Is there a way to ask Lucene to search starting from a fixed position?" > > the anwer: no, not by standard search. > > But you don't want to use your field for scoring. So this is a field to > filter results. > you could easily change RangeFilter for this purpose but the new filter > would have to read all tokes of this field(which is slow). > So you should cache the filter with CachingWrapperFilter (at least the > "most wanted" periods). > > if you have a lot of changes in (only) this field you should consider to > build a lucene Filter by your own without the help of lucene index (e.g. > direct use of bitsets or a database). > if you don"t have a lot of changes but a lot of different periods to > search for, you should change your datamodel. > Because you easly can use lucene with 1 field and 365 different tokens > (20080101, 20080102, ...20081231). > > Best regards > Karsten > > > luther blisset wrote: >> >> hi folks, >> I'm new to Lucene and I'm looking for a way to search a substring that >> starts at a fixed position. >> It isn't a classical substring search because it's a bit weird. >> I indexed a field that represents the avability of a room in a hostal >> during 1 year. >> The field is composed by 365 digits and each digit represents 1 day and >> it can be set at 0 (available) or 1 (not available). Thus a string like >> this: >> 110001111...(continues with ones until the position 365) >> means that the hostal is available from 3rd until 5th of January. >> And now the problem... >> Suppose that I want to search if an hostal is available from 3rd to 5th >> of January... >> I'd have to use wildcards and search a string like this: >> ??000????...(continues with ? until the position 365) >> I think this way is not a good one and is too bad for the application >> perfomance. >> Is there a way to ask Lucene to search starting from a fixed position? >> For instance, regard to the example above, could I search a 000 starting >> to search at the third position? >> I hope all was clear and you can help me because I've no idea how to >> solve the problem. >> Thanks a lot! >> >> Luther >> > > -- View this message in context: http://www.nabble.com/Searching-substring-starting-at-a-fixed-position-tp19432922p19436300.html Sent from the Lucene - Java Users mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
