Jiscuss/src/main/java/com/yaoyuan/jiscuss/service/impl/DiscussionsServiceImpl.java

package com.yaoyuan.jiscuss.service.impl;

import com.yaoyuan.jiscuss.entity.Discussion;
import com.yaoyuan.jiscuss.repository.DiscussionsRepository;
import com.yaoyuan.jiscuss.service.IDiscussionsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.stereotype.Service;

import javax.transaction.Transactional;
import java.util.List;

@Service
@Transactional
public class DiscussionsServiceImpl implements IDiscussionsService {
    @Autowired
    private DiscussionsRepository discussionsRepository;

    @Override
    public List<Discussion> getAllList() {
        return discussionsRepository.findAll();
    }

    @Override
    public Discussion insert(Discussion discussion) {

        return discussionsRepository.save(discussion);
    }

    @Override
    public Discussion findOne(Integer id) {
        Discussion discussion = new Discussion();
        discussion.setId(id);
        return discussionsRepository.getOne(id);
    }

    @Override
    public Page<Discussion> queryAllDiscussionsList(Discussion discussion, int pageNum, int pageSize, String tag, String type) {
        Sort sort = new Sort(Sort.Direction.DESC, "id");
        if (type.equals("hot")) {
            sort = new Sort(Sort.Direction.DESC, "likeCount");
        } else if (type.equals("new")) {
            sort = new Sort(Sort.Direction.DESC, "startTime");
        }
        @SuppressWarnings("deprecation")
        Pageable pageable = new PageRequest(pageNum, pageSize, sort);
        //将匹配对象封装成Example对象
        Example<Discussion> example = Example.of(discussion);
        if (null != tag && !"all".equals(tag)) {
            Page<Discussion> pageList = discussionsRepository.findByQuery(tag, pageable);
            return pageList;
        } else {
            Page<Discussion> pageList = discussionsRepository.findAll(example, pageable);
            return pageList;
        }


    }
}