They are indeed abstract in the IndexReader base class, but, the concrete implementation you get from IndexReader.open or IndexWriter.getReader implements the methods to return TermDocs/Positions, and, they return concrete implementations of these abstract classes.
Mike 2010/4/21 Yağız Kargın <xerxes...@gmail.com>: > Thanks for the answer. However those classes and methods are abstract. > Should I write my own implementation? Since Lucene is able to do > indexing and searching, I think there should be already implementation > of these things. > > Sorry, if Mike's answer also includes this obviously. But I couldn't > get it, I need some further explanation. > > Thanks, > Yagiz > > 2010/4/20 Michael McCandless <luc...@mikemccandless.com>: >> You have to open an IndexReader in order to walk the postings of newly >> indexed docs. >> >> EG after indexing the doc, ask for a new near-real-time reader >> (IndexWriter.getReader()), then use the postings API >> (TermDocs/TermPositions in 3.0.x, but in trunk, with the flex API, >> DocsEnum/DocsAndPositionsEnum) via IndexReader. >> >> Mike >> >> On Tue, Apr 20, 2010 at 3:39 AM, Yağız Kargın <xerxes...@gmail.com> wrote: >>> Hi all, >>> >>> I have a question about usage of lucene, I want to figure out how I >>> can get one or all posting lists, after adding a document to the >>> index, but without materializing it in files. So after I add a >>> document (let's say "to be or not to be"), I am asking if I can get >>> something like this: >>> >>> to -> (docID, tf(to)); >>> be -> (docID, tf(be)); >>> ... >>> ... >>> >>> Or this code can help better understanding: >>> >>> indexWriter.addDocument(doc); >>> someObject.someMethod(); -> and this will return all posting lists >>> created for "doc" in some data structure that i can use. >>> >>> As far as I know "addDocument(doc)" writes the results gotten from the >>> "doc" in files, but it will be better if I can get the posting lists >>> before they are wrote in files. Maybe something like this: >>> >>> someObject.giveMeAllPostingListsOfThisDocument(doc); -> and this will >>> return all posting lists created for "doc" in some data structure that >>> i can use. >>> >>> how can I write methods like those above (if we don't have same kind >>> of things), or where can I get the desired data from? >>> >>> I will be glad if you can help me. >>> >>> Best, >>> Yagiz Kargin >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org >>> For additional commands, e-mail: java-user-h...@lucene.apache.org >>> >>> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org >> For additional commands, e-mail: java-user-h...@lucene.apache.org >> >> > > > > -- > Yağız Kargın (Yagiz Kargin) > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
