metadatafactory.java.svn-base

一些公用的Java函数

/*
 * MetadataFactory.java
 * 
 * Created on 2007-11-4, 22:25:37
 * 
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package com.s7turn.sdk.content;

import com.s7turn.logging.Logger;
/**
 *
 * @author Long
 */
public abstract class MetadataFactory 
{
    private static MetadataFactory factory;
    public static MetadataFactory createInstance( String facName )
    {
        try
        {
            if( factory == null )
            {
                Object obj = Class.forName(facName).newInstance();
                if (obj instanceof MetadataFactory)
                {
                    factory = (MetadataFactory) obj;
                }
            }
        }
        catch (ClassNotFoundException ex)
        {
            
            Logger.getLogger(MetadataFactory.class).debug( "Exception: %s", ex );
            //Logger.getLogger(MetadataFactory.class.getName()).log(Level.SEVERE, null, ex);
        }
        catch (InstantiationException ex)
        {
            Logger.getLogger(MetadataFactory.class).debug( "Exception: %s", ex );
            //Logger.getLogger(MetadataFactory.class.getName()).log(Level.SEVERE, null, ex);
        }
        catch (IllegalAccessException ex)
        {
            Logger.getLogger(MetadataFactory.class).debug( "Exception: %s", ex );
            //Logger.getLogger(MetadataFactory.class.getName()).log(Level.SEVERE, null, ex);
        }
        return factory;
    }
    
    public abstract MetadataProvider createProvider();
    
}