com.socialsite.course.JoinCoursePanel.java Source code

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Here is the source code for com.socialsite.course.JoinCoursePanel.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.course;

import java.util.Date;
import java.util.HashSet;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.model.IModel;
import org.apache.wicket.spring.injection.annot.SpringBean;

import com.socialsite.BasePanel;
import com.socialsite.dao.CourseDao;
import com.socialsite.dao.MessageDao;
import com.socialsite.persistence.Course;
import com.socialsite.persistence.CourseJoinedMsg;
import com.socialsite.persistence.Message;
import com.socialsite.persistence.Student;
import com.socialsite.persistence.User;

/**
 * @author Ananth
 */
public class JoinCoursePanel extends BasePanel {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    /** specifies the visibility */
    private Boolean isVisible = null;
    private Course course;

    @SpringBean(name = "messageDao")
    private MessageDao<Message> messageDao;

    /** spring dao to handle message object */
    @SpringBean(name = "courseDao")
    private CourseDao courseDao;

    public JoinCoursePanel(final String id, final IModel<Course> model) {
        super(id, model);
        course = model.getObject();
        setOutputMarkupId(true);
        add(new AjaxLink<Void>("join") {

            /**
             * 
             */
            private static final long serialVersionUID = 1L;

            @Override
            public void onClick(final AjaxRequestTarget target) {
                // reload
                course = courseDao.load(course.getId());
                final User user = getSessionUser();
                final CourseJoinedMsg msg = new CourseJoinedMsg();
                msg.setSender(user);
                msg.setCourse(course);
                msg.setTime(new Date());
                msg.setUsers(new HashSet<User>(user.getFriends()));
                messageDao.save(msg);
                isVisible = false;
                course.addStudents((Student) user);
                courseDao.save(course);
                target.addComponent(JoinCoursePanel.this);
                target.appendJavascript("SocialSite.Message.show('You joined the course');");
            }
        });
    }

    @Override
    public boolean isVisible() {
        // check the first time only
        if (isVisible == null) {
            if (getSessionUser() instanceof Student) {
                final Student student = (Student) getSessionUser();
                isVisible = !student.getCourses().contains(course);
            } else {
                isVisible = false;
            }
        }
        return isVisible;
    }
}