questionmanager.java

老外的在线考试

/*
 * SchoolEJB - CyberDemia's library of EJBs for educational related services.
 * Copyright (C) 2003 CyberDemia Research and Services
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA  02111-1307, USA.
 *
 * See the COPYING file located in the top-level-directory of
 * the archive of this library for complete text of license.
 */
package com.cyberdemia.school;
import javax.ejb.*;
import java.rmi.RemoteException;

/**
* QuestionManager is a facade that provides
* useful methods for managing questions.
*
* @author Alexander Yap
*/
public interface QuestionManager extends EJBObject
{
	/**
	 * Adds a new question to the database. 
	 * @param data QuestionData instance with the data for the new question.
	 * @return The unique ID of the new question.
	 * @throws RemoteException if there is a problem creating the question.
	 */
	public String addQuestion(QuestionData data) throws RemoteException;

	/**
	 * Deactives the specified question, after which it may be considered to 
	 * be logically removed from the system.
	 * This method may perform some checks first to ensure that the question
	 * can be safely deactivated.
	 * 
	 * @param id Question ID
	 * @return true if the question is deactivated, false if it is not (either a problem or it is already inactive) 
	 * @throws RemoteException if the question can't be found.
	 */		 
	public boolean deactivateQuestion(String id) throws RemoteException;
	
	/**
	 * Gets list of questions from database.
	 * @param activeOnly true to only return active questions, false to return all questions.
	 * @return Array of QuestionData instances.
	 * @throws RemoteException
	 */
	public QuestionData[] getQuestions(boolean activeOnly) throws RemoteException;
	
	/**
	 * Gets Ids of questions that belong to specified test.
	 * If testId is null or an empty String, this methods gets all questions that 
	 * are not assigned to any test.
	 * @param testId Test Id
	 * @return Array of QuestionData instances.
	 */
	public QuestionData[] getQuestionsByTest(String testId) throws RemoteException;

	/**
	 * Gets the data of a specified question.
	 * @param id Question ID.
	 * @return QuestionData instance storing the question's data.
	 * @throws RemoteException if the question can't be found.
	 */
	public QuestionData getQuestionData(String id) throws RemoteException;
	
	/**
	 * Sets the data of a specified question.
	 * @param id Question ID.
	 * @param data QuestionData instance with the question's data.
	 * @throws RemoteException if the question can't be found.
	 */
	public void setQuestionData(String id, QuestionData data) throws RemoteException;

}