cmdfactory.java

自定义架构仿struts+command循环调用版

package accp.factory;

import java.util.HashMap;
import java.util.Map;

import accp.command.ICommand;

public class CmdFactory implements IFactory{
	
	private CmdFactory() {}
	private static CmdFactory factory = new CmdFactory();
	public static CmdFactory getInstance() {
		return factory;
	}
	
	private static Map<String,ICommand> cmdCache;
	private static Map<String,String> xmlMap;
	static{
		cmdCache = new HashMap<String,ICommand>();
		xmlMap = ReadConfig.getInstance().readFromXML();
	}

	public ICommand createCmd(String type) {
		if(cmdCache.containsKey(type)) 
			return cmdCache.get(type);
			
		ICommand cmd = null;
	  try{
		String classname = xmlMap.get(type);
		Class cls = Class.forName(classname);
		cmd = (ICommand)cls.newInstance();
		cmdCache.put(type, cmd);
	  }catch(Exception e){}
		return cmd;
	}
}