backend/src/main/java/nju/seec/helper/dao/CommentDAO.java

package nju.seec.helper.dao;

import nju.seec.helper.entity.Comment;
import nju.seec.helper.entity.User;
import nju.seec.helper.enums.ExceptionType;
import nju.seec.helper.exception.HelperException;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @author cst
 */
@Repository
public interface CommentDAO extends JpaRepository<Comment, Long>, JpaSpecificationExecutor<Comment> {
    /**
     * 封装findById
     *
     * @param id
     * @return
     */
    default Comment findCommentById(Long id) {
        return this.findById(id)
                .orElseThrow(() -> HelperException.of(ExceptionType.NOT_FOUND, "找不到评论"));
    }

    /**
     * 根据课件ID、页码、置顶指数统计
     *
     * @param slideId
     * @param pageNumber
     * @param topNumber
     * @return
     */
    long countBySlideIdAndPageNumberAndTopNumberNot(Long slideId, Integer pageNumber, Integer topNumber);

    /**
     * 根据课件ID、页码、置顶指数检索
     *
     * @param slideId
     * @param pageNumber
     * @param topNumber
     * @return
     */
    List<Comment> findBySlideIdAndPageNumberAndTopNumberGreaterThan(Long slideId, Integer pageNumber, Integer topNumber);

    /**
     * 根据课件ID、页码、是否展示检索
     *
     * @param slideId
     * @param pageNumber
     * @param show
     * @param pageable
     * @return
     */
    Page<Comment> findBySlideIdAndPageNumberAndShow(Long slideId, Integer pageNumber, Boolean show, Pageable pageable);

    /**
     * 根据课件ID、页码、用户ID、是否展示检索
     *
     * @param slideId
     * @param pageNumber
     * @param user
     * @param show
     * @param pageable
     * @return
     */
    Page<Comment> findBySlideIdAndPageNumberAndUserAndShow(Long slideId, Integer pageNumber, User user, Boolean show, Pageable pageable);
}