Question about new TopScoreDocCollector class in Lucene 2.9

[M R]

Hi

This is the example given on the deprecated Hits class about using the new 
TopScoreDocCollector class :

TopScoreDocCollector collector = new TopScoreDocCollector(hitsPerPage);
   searcher.search(query, collector);
   ScoreDoc[] hits = collector.topDocs().scoreDocs;
   for (int i = 0; i < hits.length; i++) {
     int docId = hits[i].doc;
     Document d = searcher.doc(docId);
     // do something with current hit
     ...
I suppose hitsPerPage is the number of documents to return ? 
(TopScoreDocCollector is noted abstract with no constructor on its javadoc).
Thanks
Michel