UserGroupService.java

package de.dlr.shepard.neo4Core.services;

import java.util.ArrayList;
import java.util.List;

import de.dlr.shepard.neo4Core.dao.PermissionsDAO;
import de.dlr.shepard.neo4Core.dao.UserDAO;
import de.dlr.shepard.neo4Core.dao.UserGroupDAO;
import de.dlr.shepard.neo4Core.entities.Permissions;
import de.dlr.shepard.neo4Core.entities.User;
import de.dlr.shepard.neo4Core.entities.UserGroup;
import de.dlr.shepard.neo4Core.io.UserGroupIO;
import de.dlr.shepard.util.DateHelper;
import de.dlr.shepard.util.PermissionType;
import de.dlr.shepard.util.QueryParamHelper;

public class UserGroupService {

	private UserGroupDAO userGroupDAO = new UserGroupDAO();
	private UserDAO userDAO = new UserDAO();
	private PermissionsDAO permissionsDAO = new PermissionsDAO();
	private DateHelper dateHelper = new DateHelper();

	public List<UserGroup> getAllUserGroups(QueryParamHelper params, String username) {
		return userGroupDAO.findAllUserGroups(params, username);
	}

	public UserGroup getUserGroup(Long userGroupId) {
		return userGroupDAO.find(userGroupId);
	}

	public UserGroup createUserGroup(UserGroupIO userGroup, String username) {
		var user = userDAO.find(username);
		var toCreate = new UserGroup();
		toCreate.setName(userGroup.getName());
		toCreate.setCreatedBy(user);
		toCreate.setCreatedAt(dateHelper.getDate());
		toCreate.setUsers(fetchUsers(userGroup.getUsernames()));
		var created = userGroupDAO.createOrUpdate(toCreate);
		permissionsDAO.createOrUpdate(new Permissions(created, user, PermissionType.Private));
		return created;
	}

	public UserGroup updateUserGroup(Long id, UserGroupIO userGroup, String username) {
		var user = userDAO.find(username);
		var old = userGroupDAO.find(id);
		old.setUpdatedBy(user);
		old.setUpdatedAt(dateHelper.getDate());
		old.setName(userGroup.getName());
		old.setUsers(fetchUsers(userGroup.getUsernames()));
		var updated = userGroupDAO.createOrUpdate(old);
		return updated;
	}

	public boolean deleteUserGroup(Long id) {
		var old = userGroupDAO.find(id);
		if (old == null)
			return false;

		var permissions = permissionsDAO.findByEntity(id);
		var permissionsResult = permissions == null || permissionsDAO.delete(permissions.getId());
		if (!permissionsResult)
			return false;

		return userGroupDAO.delete(id);
	}

	private ArrayList<User> fetchUsers(String[] usernames) {
		var result = new ArrayList<User>(usernames.length);
		for (var username : usernames) {
			if (username == null) {
				continue;
			}
			var user = userDAO.find(username);
			if (user != null) {
				result.add(user);
			}
		}
		return result;
	}

}