answerhistoryrecordkey.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 java.io.Serializable;

/**
 * 
 * AnswerHistoryRecordKey is the primary key class for LocalAnswerHistoryRecord.
 * It is made up of the user, test and question IDs.
 * 
 * @author Alexander Yap
 */
public class AnswerHistoryRecordKey implements Serializable
{
	public String userId;
	public String testId;
	public String questionId;
	
	public AnswerHistoryRecordKey() { }
	
	/**
	 * Gets the user ID.
	 * @return User ID
	 */
	public String getUserId()
	{
		return userId;
	}

	/**
	 * Gets the test ID.
	 * @return Test ID
	 */
	public String getTestId()
	{
		return testId;
	}

	/**
	 * Gets the question ID.
	 * @return Question ID
	 */
	public String getQuestionId()
	{
		return questionId;
	}

	public boolean equals(Object rhs)
	{
		if (rhs instanceof AnswerHistoryRecordKey)
		{
			AnswerHistoryRecordKey rhsKey = (AnswerHistoryRecordKey)rhs;
			return ( userId.equals( rhsKey.userId) && testId.equals(rhsKey.testId) && questionId.equals(rhsKey.questionId) );
		}
		return false;
	}

	public int hashCode()
	{
		StringBuffer buf = new StringBuffer();
		buf.append(userId);
		buf.append(testId);
		buf.append(questionId);
		return buf.toString().hashCode();
	}

}