import java.io.InputStream;

import java.util.Enumeration;

import java.util.Hashtable;

import java.util.Map;

import java.util.Properties;

public class BeanFactory {

private static Map<String, Object> objectPool = new Hashtable<String, Object>();

static {

Properties config = new Properties();

InputStream in = BeanFactory.class

.getResourceAsStream("beans-config.properties");

if (in == null) {

throw new ExceptionInInitializerError(

"no file:beans-config found error!");

}

try {

config.load(in);

in.close();

Enumeration ids = config.propertyNames();

while (ids.hasMoreElements()) {

String id = (String) ids.nextElement();

String className = config.getProperty(id);

Object instance = Class.forName(className).newInstance();

objectPool.put(id, instance);

}

} catch (Exception e) {

e.printStackTrace();

throw new ExceptionInInitializerError("failed to init bean pools!");

}

}

public static Object getBean(String id) {

return objectPool.get(id);

}

}