source: ComponentRegistry/trunk/ComponentRegistry/src/main/java/clarin/cmdi/componentregistry/persistence/jpa/CommentsDao.java @ 4098

package clarin.cmdi.componentregistry.persistence.jpa;

import java.util.List;

import org.springframework.dao.DataAccessException;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;

import clarin.cmdi.componentregistry.model.Comment;
import clarin.cmdi.componentregistry.model.RegistryUser;

/**
 * Interface for DAOs that handle comments
 * @author george.georgovassilis@mpi.nl
 *
 */
public interface CommentsDao extends JpaRepository<Comment, Long>{

        /**
         * Get the list of all the comments available in the database The
         * distinction between profile or component is not treated in this method
         * 
         * @return list of Comments
         */
        @Query("select c from Comment c order by c.id")
        List<Comment> getAllComments();

        /**
         * Retrieve the comments related to a certain component
         * 
         * @param id
         *            Database record id (fkey)
         * @return list of Comments
         * @throws DataAccessException
         */
        @Query("select c from Comment c where c.componentId = ?1 order by c.commentDate, c.id")
        List<Comment> getCommentsFromComponent(String componentId)
                        throws DataAccessException;

        /**
         * 
         * @param id
         *            Id of description record
         * @return Principal name of description's owner, if any. Otherwise, null.
         */
        @Query("select user from RegistryUser user, Comment comment, BaseDescription component where comment.id = ?1 and comment.componentId = component.componentId and component.dbUserId = user.id")
        RegistryUser getOwnerOfComment(long id);

        /**
         * Method use for tests that will select comments based on the content
         * 
         * @param aComment
         * @return list of Comments
         * @throws DataAccessException
         */
        @Query("select c from Comment c where c.comments = ?1")
        Comment getByComment(String aComment) throws DataAccessException;

        /**
         * Get number of comments for component
         * 
         * @param componentId
         * @return comment count
         */
        @Query("select count(c) from Comment c where c.componentId = ?1")
        long findCommentCountForComponent(String componentId);
        
        /**
         * Get number of comments for components
         * 
         * @param componentIds
         * @return list of (componentId,count) tuples
         */
        @Query(nativeQuery=true, value = "select component_id, count(*) from comments where component_id in (?1) group by component_id")
        List<Object[]> findCommentCountForComponents(List<String> ids);
}