com.bibisco.manager.VersionManager.java Source code

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Here is the source code for com.bibisco.manager.VersionManager.java

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/*
 * Copyright (C) 2014 Andrea Feccomandi
 *
 * Licensed under the terms of GNU GPL License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.gnu.org/licenses/gpl-2.0.html
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY. 
 * See the GNU General Public License for more details.
 * 
 */
package com.bibisco.manager;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import com.bibisco.BibiscoException;
import com.bibisco.dao.SqlSessionFactoryManager;
import com.bibisco.dao.client.PropertiesMapper;
import com.bibisco.dao.model.Properties;
import com.bibisco.log.Log;

/**
 * Application's version manager.
 * 
 * @author Andrea Feccomandi
 *
 */
public class VersionManager {

    private static VersionManager mVersionManager = null;
    private static Log mLog = Log.getInstance(VersionManager.class);

    private String mStrVersion;

    private VersionManager() {
        mStrVersion = initVersion();
    }

    public synchronized static VersionManager getInstance() {
        if (mVersionManager == null) {
            mVersionManager = new VersionManager();
        }

        return mVersionManager;
    }

    public String getVersion() {
        return mStrVersion;
    }

    private String initVersion() {

        String lStrVersion = null;

        mLog.debug("Start initVersion()");

        SqlSessionFactory lSqlSessionFactory = SqlSessionFactoryManager.getInstance().getSqlSessionFactoryBibisco();
        SqlSession lSqlSession = lSqlSessionFactory.openSession();
        try {

            PropertiesMapper lPropertiesMapper = lSqlSession.getMapper(PropertiesMapper.class);
            Properties lProperties = lPropertiesMapper.selectByPrimaryKey("version");

            if (lProperties != null) {
                lStrVersion = lProperties.getValue();
            }

        } catch (Throwable t) {
            mLog.error(t);
            throw new BibiscoException(t, BibiscoException.SQL_EXCEPTION);
        } finally {
            lSqlSession.close();
        }

        mLog.debug("End initVersion()");

        return lStrVersion;
    }
}