/*
* Computoser is a music-composition algorithm and a website to present the results
* Copyright (C) 2012-2014 Bozhidar Bozhanov
*
* Computoser is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Computoser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Computoser. If not, see <http://www.gnu.org/licenses/>.
*/
package com.music.service;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.TreeSet;
import javax.inject.Inject;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.google.common.primitives.Ints;
import com.google.common.primitives.Longs;
import com.music.dao.PieceDao;
import com.music.model.persistent.Piece;
import com.music.model.persistent.PiecePack;
@Service
public class PiecePackService {
@Inject
private PieceDao dao;
@Inject
private PieceService pieceService;
@Transactional(readOnly=true)
public List<PiecePack> getPiecePacks() {
List<PiecePack> packs = dao.listOrdered(PiecePack.class, "priority");
// order pieces in memory, by likes
for (PiecePack pack : packs) {
TreeSet<Piece> pieces = new TreeSet<>(pieceComparator);
pieces.addAll(pack.getPieces());
pack.setPieces(pieces);
}
return packs;
}
public static final Comparator<Piece> pieceComparator = new Comparator<Piece>() {
@Override
public int compare(Piece o1, Piece o2) {
int result = Ints.compare(o2.getLikes(), o1.getLikes());
if (result == 0) {
result = Longs.compare(o2.getId(), o1.getId());
}
return result;
}
};
@Transactional(readOnly=true)
public List<PiecePack> getPiecePacks(ArrayList<Long> ids) {
return dao.getByIds(PiecePack.class, ids);
}
@Transactional
public void download(long packId, OutputStream out) throws IOException {
PiecePack pack = getPack(packId);
pack.setDownloads(pack.getDownloads() + 1);
dao.persist(pack);
pieceService.downloadPieces(out, pack.getPieces());
}
@Transactional(readOnly=true)
public PiecePack getPack(long id) {
return dao.getById(PiecePack.class, id);
}
}