telosys

package org.objectweb.telosys.dal;

import java.io.InputStream;

import org.objectweb.telosys.common.Telosys;
import org.objectweb.telosys.dal.dao.DAOProvider;
import org.objectweb.telosys.dal.dao.DAOProviderImpl;
import org.objectweb.telosys.dal.dao.DAORegistries;
import org.objectweb.telosys.dal.sql.ConnectionManager;
import org.objectweb.telosys.util.FileUtil;

/**
 * Telosys Data Access Layer ( DAL ) manager <br>
 * 
 * Static methods to initialize the D.A. Layer and retrieve the DAO provider
 * 
 * @author Laurent GUERIN
 * 
 */
public final class TelosysDAL 
{
    //--- Fichier de configuration des bases de données
    private static String         $sDbConfigFileName  = null ;

    private static DAOProvider    $daoProvider        = null ; // v 1.0.0 
    
    //-----------------------------------------------------------------------------
    // PUBLIC METHODS
    //-----------------------------------------------------------------------------
    //-----------------------------------------------------------------------------
    /**
     * Telosys DAL initialization with the Telosys properties <br>
     * @return
     */
    public static boolean init()
    {
        Telosys.info("TelosysDAL : INIT from telosys properties ..." );

        boolean bRet = false;        
        InputStream is = Telosys.getDbConfigInputStream();
        if ( is != null )
        {            
            //--- Connection Manager initialization ( use the DbConfFile )
                bRet = ConnectionManager.init(is);
                        if ( bRet )
                        {
                            //--- Keep the file name used for init 
                    $sDbConfigFileName = Telosys.getDbConfigFileName() ;
                            Telosys.info ( "Connection Manager initialized (conf. file = " + $sDbConfigFileName + ")" ) ;
                        }
                        else
                        {
                            Telosys.error ( "Cannot initialize Connection Manager !" ) ;                                            
                        }
        }
        else
        {
            Telosys.error("TelosysDAL.init() : Cannot get DBCONFIG InputStream ! ");
        }
        afterInit(); // v 1.0.0 
        return bRet ;
    }
    
    //-----------------------------------------------------------------------------
    /**
     * Telosys-DAL initialization from the given config file name<br>
     * (method to init Telosys-DAL without full Telosys environment)
     * @param sDbConfigFileName the full path for the configuration file ( 'dbconfig.xml' ) 
     * @return
     */
    public static boolean init(String sDbConfigFileName)
    {
        Telosys.info("TelosysDAL : INIT from file '" + sDbConfigFileName + "'" );
        boolean bRet = false;
        if (sDbConfigFileName == null)
        {
            Telosys.error("TelosysDAL.init(ConfigFile) : file parameter is null ");
        }
        else
        {
            String sFileName = sDbConfigFileName.trim() ;
            //--- Build full path from relative path (if any)
            //if ( Tool.fileExists( sFileName ) )
            if ( FileUtil.exists( sFileName ) ) // v 1.1.0
            {
                //--- Connection Manager initialization ( use the DbConfFile )
                        bRet = ConnectionManager.init(sFileName);
                                if ( bRet )
                                {
                                    //--- Keep the file name used for init 
                            $sDbConfigFileName = sFileName ;
                                    Telosys.info ( "Connection Manager initialized (config file = " + sFileName + ")" ) ;
                                }
                                else
                                {
                                    Telosys.error ( "Cannot initialize Connection Manager !" ) ;                                            
                                }
            }
            else
            {
                Telosys.error("TelosysDAL.init(ConfigFile) : file " + sFileName + " not found !");                                        
            }                   
        }
        afterInit(); // v 1.0.0 
        return bRet;
    }
    
    //-----------------------------------------------------------------------------
    private static void afterInit() // v 1.0.0 
    {
        Telosys.info("TelosysDAL : DAO registries initialization ..." );
        
        //--- Init all the DAO registries ( one for each database )
        DAORegistries reg = new DAORegistries();
        
        Telosys.info("TelosysDAL : " + reg.getNumberOfRegistries() + " DAO registries initialized." );
        
        //--- Init the DAO provider
        $daoProvider = new DAOProviderImpl(reg);        
        
        Telosys.info("TelosysDAL : DAO provider ready." );
    }
    
    //-----------------------------------------------------------------------------
    /**
     * Returns the config file name used for initialization
     * @return
     */
    public static String getDbConfig()
    {
        return $sDbConfigFileName ;
    }
    
    //-----------------------------------------------------------------------------
    /**
     * Return the DAO provider 
     * @return
     * @since 1.0.0
     */
    public static DAOProvider getDAOProvider() // v 1.0.0 
    {
        return $daoProvider;
    }
    
}