Issue on the DTO(Data Transfer object)

why getAllLookupData method of the below two has to map . i got this code from  internet as i have to look at it as there is some issue in it and can be used in my college project.
any help sir ?

@GetMapping
	public ResponseEntity<?> fetch(@RequestHeader("userinfo") String userinfo,PageAttributes pageAttributes) throws AdminServiceException {

		HashMap<String, String> map=HeaderInfoUtility.getCredentials(userinfo);
		LOGGER.info("-----username--------{}--",map.get(USERNAME));
		LOGGER.info("------password-----{}---",map.get(PASSWORD));
		LOGGER.info("------passwordEncrypted-----{}---",map.get(ENCRYPTEDPASSWORD));
		
		UserContext userContext=new UserContext();
		userContext.setPassword(map.get(ENCRYPTEDPASSWORD));
		userContext.setUsername(map.get(USERNAME));
		
		AdminDTO adminDto = lookupActionsService.getAllLookupData(pageAttributes.getPageNumber(),
				pageAttributes.getPageSize(), pageAttributes.getSortType(), pageAttributes.getSortFields(),
				pageAttributes.getLocale(), userContext);

		return new ResponseEntity<>(adminDto, HttpStatus.OK);
	}

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@Override
	public AdminDTO getAllLookupData(int pageNumber, int pageSize, String sortType, List<String> sortFields,
			String locale, UserContext userContext) {
		
		AdminDTO adminDto = null;
		String repositoryType = getRepositoryType();

		try {
			adminDto = adminFactory.getAdminFactory(repositoryType).
					getAllActionsLookupData(pageNumber, pageSize, sortType, sortFields, locale, userContext);
		} catch (CmsRevampFactoryException ce) {
			LOGGER.error(
					"Error occurred while retrieving actions lookup :getAllLookupData() {}",
					ce.fillInStackTrace());
			throw new AdminServiceException(
					"Exception occured while retrieving actions lookup ");

		}
		return adminDto;
	}
	

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