contentfactory.java.svn-base

一些公用的Java函数

/*
 * ContentFactory.java
 * 
 * Created on 2007-10-31, 17:47:23
 * 
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package com.s7turn.sdk.content;

/**
 *
 * @author Long
 */
public abstract class ContentFactory 
{
    //protected static Log logger = LogFactory.getLogger( ContentFactory.class );
    public final static String CONTENT_FACTORY = "com.s7turn.contentProviderFactory";
    
    public abstract ContentProvider createProvider();
    
    public static ContentFactory createFactory() throws ContentException
    {
        try
        {
            ///select the contentFactory from system.properties;
            String className = System.getProperties().getProperty( CONTENT_FACTORY );
            Class cnf = Class.forName(className);
            Object factory = cnf.newInstance();
            if (factory instanceof ContentFactory)
            {
                return (ContentFactory) factory;
            }
            
            throw new ContentException( "Can not find the ContentProviderFactory." );
            
        }
        catch (InstantiationException ex)
        {
            throw new ContentException( ex.getMessage(), ex );
        }
        catch (IllegalAccessException ex)
        {
            throw new ContentException( ex.getMessage(), ex );
        }
        catch (ClassNotFoundException ex)
        {
            throw new ContentException( ex.getMessage(), ex );
        }
    }
}