edu.harvard.mcz.imagecapture.data.AllowedVersionLifeCycle.java Source code

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Here is the source code for edu.harvard.mcz.imagecapture.data.AllowedVersionLifeCycle.java

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/**
 * AllowedVersionLifeCycle.java
 *
 * Copyright  2017 President and Fellows of Harvard College
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of Version 2 of the GNU General Public License
 * as published by the Free Software Foundation.
 *
 * 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/>.
 * 
 * Author: Paul J. Morris
 */
package edu.harvard.mcz.imagecapture.data;

import java.util.Iterator;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.SessionException;
import org.hibernate.classic.Session;

import edu.harvard.mcz.imagecapture.ImageCaptureApp;

/**
 * @author mole
 *
 */
public class AllowedVersionLifeCycle {

    private static final Log log = LogFactory.getLog(AllowedVersionLifeCycle.class);

    /**
     * Check to see if the allowed versions in the database include the version
     * of the current ImageCaptureApp.  
     * 
     * @return true if an AllowedVersion.version in the database is found at the
     * beginning of ImageCaptureApp.APP_VERSION, otherwise false.
     */
    public static boolean isCurrentAllowed() throws HibernateException {
        boolean result = false;
        AllowedVersionLifeCycle als = new AllowedVersionLifeCycle();

        List<AllowedVersion> allowedVersions = als.findAll();
        Iterator<AllowedVersion> i = allowedVersions.iterator();
        while (i.hasNext()) {
            String version = i.next().getVersion();
            String currentVersion = ImageCaptureApp.APP_VERSION;
            if (version != null && currentVersion != null && version.length() <= currentVersion.length()
                    && currentVersion.startsWith(version)) {
                result = true;
            }
        }

        return result;
    }

    /**
     * Provide a human readable list of the allowed versions listed in the database.
     * 
     * @return string listing allowed versions according to database.
     */
    public static String listAllowedVersions() {
        StringBuilder allowed = new StringBuilder();
        AllowedVersionLifeCycle als = new AllowedVersionLifeCycle();
        try {
            List<AllowedVersion> allowedVersions = als.findAll();
            Iterator<AllowedVersion> i = allowedVersions.iterator();
            String separator = "";
            while (i.hasNext()) {
                allowed.append(separator).append(i.next().getVersion());
                separator = ", ";
            }
        } catch (Exception e) {
            log.error(e.getMessage());
        }
        return allowed.toString();
    }

    public List<AllowedVersion> findAll() {
        log.debug("finding all AllowedVersions");
        try {
            List<AllowedVersion> results = null;
            Session session = HibernateUtil.getSessionFactory().getCurrentSession();

            session.beginTransaction();
            try {
                results = (List<AllowedVersion>) session.createQuery("SELECT a FROM AllowedVersion a").list();
                session.getTransaction().commit();
                log.debug("find all successful, result size: " + results.size());
            } catch (HibernateException e) {
                session.getTransaction().rollback();
                log.error(e.getMessage());
                throw e;
            }
            try {
                session.close();
            } catch (SessionException e) {
            }
            return results;
        } catch (RuntimeException re) {
            log.error("find all failed", re);
            throw re;
        }
    }

}