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TrackService.java
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TrackService.java
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package nl.jpoint.top2k.service;
import java.util.List;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import com.google.inject.Provider;
import nl.jpoint.top2k.domain.Track;
/**
* Track Service.
*/
public class TrackService implements ITrackService {
private static final int PAGE_SIZE = 25;
@Inject
private Provider<EntityManager> provider;
@Override
public void create(final Track track) {
provider.get().persist(track);
}
@Override
public List<Track> getAll() {
return provider.get().createNamedQuery("Track.findAll").getResultList();
}
@Override
public List<Track> getPagedList(final int page) {
Query query = provider.get().createNamedQuery("Track.findAll");
query.setFirstResult(page * PAGE_SIZE);
query.setMaxResults(PAGE_SIZE);
return query.getResultList();
}
@Override
public Track getById(final long id) {
return provider.get().find(Track.class, id);
}
@Override
public List<Long> getValidTrackIds() {
return provider.get().createQuery("SELECT t.id FROM Track t WHERE t.artist IS NOT NULL").getResultList();
}
}