@Override
public BusinessResult buy(String userId, String bookId) throws DataAccessException {
UserBook userBook = new UserBook();
User user = mutableDataAccess.findById(User.class, userId);
Book book = mutableDataAccess.findById(Book.class, bookId);
Map<String, Object> map = new HashMap<String, Object>();
map.put("userId", userId);
map.put("bookId", bookId);
List<UserBook> userBooks = mutableDataAccess.paging(UserBook.class, 1, 1, map);
if (userBooks.size() > 0) {
if (userBooks.get(0).isHasBuyed() && book.getPrice() > 0) {
return new BusinessResult(BusinessResult.ResultStatus.FAIL, "该书已经购买，不需要重复购买");
}
userBook = userBooks.get(0);
}
userBook.setBookId(bookId);
userBook.setUserId(userId);
if (book.getPrice() <= 0) {
userBook.setHasBuyed(userBook.isHasBuyed());
mutableDataAccess.save(userBook);
return new BusinessResult(BusinessResult.ResultStatus.OK, "免费书籍,已经保存到书架上");
} else {
if (user.getCredits() < book.getPrice()) {
return new BusinessResult(BusinessResult.ResultStatus.FAIL, "购买失败，您的信用值余额不足，请充值");
} else {
user.setCredits(user.getCredits() - book.getPrice());
userBook.setHasBuyed(true);
userBook.setUser(user);
userBook.setBook(book);
mutableDataAccess.save(user);
book.setSellAmount(book.getSellAmount() + 1);
mutableDataAccess.save(book);
mutableDataAccess.save(userBook);
return new BusinessResult(BusinessResult.ResultStatus.OK, "购买成功，已经保存到书架上");
}
}
}
@Override
public BusinessResult addToBookshelf(String userId, String bookId) throws DataAccessException {
Map<String, Object> map = new HashMap<String, Object>();
map.put("userId", userId);
map.put("bookId", bookId);
List<UserBook> userBooks = mutableDataAccess.paging(UserBook.class, 1, 1, map);
if (userBooks.size() > 0) {
return new BusinessResult(BusinessResult.ResultStatus.FAIL, "该书已经在你的书架中了，无需再添加");
}
final UserBook userBook = new UserBook();
userBook.setHasBuyed(false);
userBook.setUserId(userId);
userBook.setBookId(bookId);
userBook.setUser(mutableDataAccess.findById(User.class, userId));
userBook.setBook(mutableDataAccess.findById(Book.class, bookId));
mutableDataAccess.save(userBook);
Book book = mutableDataAccess.findById(Book.class, bookId);
book.setUserFavoriteAmount(book.getUserFavoriteAmount() + 1);
mutableDataAccess.save(book);
return new BusinessResult(BusinessResult.ResultStatus.OK, "加入书架成功");
}