Hello,
I want to use DataView to present Search Results from Hibernate
Search, but I got stuck with implementation of DataProvider - maybe
first I show you classes:
private class SearchDataProvider implements IDataProvider {
private String query;
public SearchDataProvider(String query) {
this.query = query;
}
@Override
public Iterator iterator(int first, int count) {
SearchDAO.SearchResults searchedAdverts =
searchDAO.getSearchedAdverts(this.query, first, count);
return searchedAdverts.getResults().iterator();
}
@Override
public IModel model(Object object) {
return new Model((Advertisement) object);
}
@Override
public int size() {
SearchDAO.SearchResults searchedAdverts =
searchDAO.getSearchedAdverts(this.query, 0, 0);
return searchedAdverts.getCount();
}
@Override
public void detach() {
}
}
in SearchDAO I have:
public class SearchDAO extends HibernateDaoSupport {
public SearchResults getSearchedAdverts(final String queryString, int
first, int count) {
Session session = getSession(true);
FullTextSession fullTextSession =
Search.createFullTextSession(session);
SearchResults results = null;
Transaction tx = fullTextSession.beginTransaction();
MultiFieldQueryParser parser = new MultiFieldQueryParser( new
String[]{"title", "rawBody"},
new StandardAnalyzer());
Query query;
try {
query = parser.parse(queryString);
FullTextQuery hibQuery =
fullTextSession.createFullTextQuery(query,
Advertisement.class)
.setFirstResult(first)
.setMaxResults(count);
results = new SearchResults(hibQuery.list(),
hibQuery.getResultSize());
} catch (ParseException e) {
e.printStackTrace();
} finally {
tx.commit();
session.close();
}
}
SearchResults is a wrapper for sublist of results and number of all:
public class SearchResults {
private List<Advertisement> results = null;
private int count = 0;
public SearchResults(List<Advertisement> results, int count) {
super();
this.results = results;
this.count = count;
}
//getters/setters
}
As you see I have to repeat searching in size() and iterator()
(SearchDAO.SearchResults searchedAdverts =
searchDAO.getSearchedAdverts(this.query, 0, 0); and
SearchDAO.SearchResults searchedAdverts =
searchDAO.getSearchedAdverts(this.query, first, count);) in size I do
not get collection, but searching happens because this method is
launched before iterator() which could answer with number of all
results as hibQuery.getResultSize();
It's very inefficient, and I don't know how can I repair that, without
writing my own DataView implementation. DataProvider is good for
databases which need to make additional select count(*), but Lucene
Hibernate Search make it in one pass.
Anybody has a suggestion on this topic?
Best regards,
Adr
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
