Am 08.06.2012 um 13:58 schrieb Emmanuel Lécharny <elecha...@gmail.com>:
> Le 6/8/12 1:49 PM, Garbage a écrit : >> I learned a lot about the implementation of custom partitions and see the >> changes in the API from search and lookup returning an Entry in 1.5.x and an >> EntryFilteringCursor later on. >> I even was able to change an existing partition (shame on me: based on the >> 1.5.5 example, but I will switch to 2.0 soon) in a way that lets it return a >> fake group object that was created in my custom POJO. >> >> But I am only able to return ONE entry, I didn't find or understand the >> concept how MULTIPLE entries can be returned. Can someone show me the right >> direction ? > The idea is to use a Cursor that maps around the partition and fetch the > entries one by one. > > The way the server works is that based on your filter, you select the right > index to use to fetch the entries. There are may possibilities here : > - first, you may have to do a full scan (the filter is not selective enough, > for instance). In this case, you don't use any index, you just use the > MasterTable to get the entries. Now, for each entry you fetch, you'll have to > filter them to see if it's a valid entry - or not. > - or you can select an index. You will fetch the index elements, and for each > of them, fetch the associated entry. Once done, you can check against the > filter if the entry is valid - or not > > In any case, the cursor is your friend here : it maps the next() operation on > top of your index. > > Now, if your Partition is a Btree, it's easier, as the AbstractBTreePartition > class already handles everyting for you. If you don't inherit from this > Abstract class, then it's way more complicated. I'll suggest you have a look > at the AbstractBTreePartition to get a clue about how we process a search > over a BTree based partition. > > -- > Regards, > Cordialement, > Emmanuel Lécharny > www.iktek.com > Thanks, I will investigate this. What a pity, I am able to map searches to string arrays containing the name of groups I want to return. But I understand why you don't support arrays directly, I will somehow manage to map to the Bree example. And if not I will show up here again ;-)
