com.socialsite.dao.hibernate.QuestionDaoImpl.java Source code

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Here is the source code for com.socialsite.dao.hibernate.QuestionDaoImpl.java

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/**
 *     Copyright SocialSite (C) 2009
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program 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 General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.socialsite.dao.hibernate;

import java.util.HashSet;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Query;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Projections;
import org.hibernate.criterion.Restrictions;

import com.socialsite.dao.QuestionDao;
import com.socialsite.persistence.Question;
import com.socialsite.persistence.QuestionInfoMsg;
import com.socialsite.persistence.User;

/**
 * 
 * @author Ananth
 * 
 */
public class QuestionDaoImpl extends AbstractDaoImpl<Question> implements QuestionDao {

    /**
     * construtor
     */
    public QuestionDaoImpl() {
        super(Question.class);
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.socialsite.dao.QuestionDao#getQuestions(long)
     */
    @SuppressWarnings("unchecked")
    public List<Question> getQuestions(final long courseId, final int first, final int count) {
        final Criteria criteria = getSession().createCriteria(domainClass);
        criteria.add(Restrictions.eq("course.id", courseId));
        criteria.setFirstResult(first);
        criteria.setMaxResults(count);

        // order by date
        criteria.addOrder(Order.desc("time"));
        return criteria.list();
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.socialsite.dao.QuestionDao#getQuestionsCount(long)
     */
    public int getQuestionsCount(final long courseId) {
        final Criteria criteria = getSession().createCriteria(domainClass);
        criteria.add(Restrictions.eq("course.id", courseId));
        criteria.setProjection(Projections.rowCount());
        return (Integer) criteria.uniqueResult();
    }

    @Override
    public void delete(Question object) {
        Query query = getSession().createQuery("from QuestionInfoMsg m where m.question.id = :id")
                .setParameter("id", object.getId());
        QuestionInfoMsg msg = (QuestionInfoMsg) query.uniqueResult();
        msg.setUsers(new HashSet<User>());
        getSession().saveOrUpdate(msg);
        getSession().delete(msg);
        super.delete(object);
    }

}