package main.cn.edu.nju.software.sd.cll;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.*;
/**
 * CLL工程最主要的類之一，主要用于控制logger的創建，logger的存儲，logger的初始化配置
 * @author ohai
 * */
public class LogManager {
	private static LogManager manager = new LogManager();
	private LoggerFactory factory;
	private Hashtable<String,Logger> table;
	
	private LogManager()
	{
		table = new Hashtable<String,Logger>();
		factory = new DefaultLoggerFactory();
	}
	public static LogManager getLogManager()
	{
		return manager;
	}
/**
 * 獲得logger,如果不存在這個名字的logger，則調用工廠方法創建一個logger
 * @param name 需要返回的logger的名字
 * */	
	public Logger getLogger(String name)
	{
		Logger logger = table.get(name);
		if(logger==null)
		{
			logger = factory.createNewLogger(name);
//			System.out.println("here");
			Configuration.config(logger);
			setParent(logger);
			table.put(name, logger);
			updateParent();
		}
		return logger;
	}
/**
 * 搜索是否存在這個logger
 * @param logger 要搜索的logger
 * */	
	public boolean findLogger(Logger logger)
	{
		boolean isexist = table.contains(logger);
		return isexist;
	}
/**
 * 獲得logger的父logger
 * @param logger 請求獲得父logger的logger
 * */	
	private Logger getParent(Logger logger)
	{
		String loggerName = logger.getName();
		String temp = loggerName;
		String parentName = null;
		Logger parent = null;
		int dot = loggerName.lastIndexOf(".");
		while(dot!=-1)
		{
		    parentName = temp.substring(0,dot);
		    parent = table.get(parentName);
		    if(parent==null)
		    {
		    	dot = parentName.lastIndexOf(".");
		    	temp = parentName;
		    }
		    else
		    	break;
		}	
		if(parent!=null)
			return parent;
		else
			return Logger.getRootLogger();
			
	}
	/**設置logger的parent*/
	private void setParent(Logger logger)
	{
		Logger parent = getParent(logger);
		logger.parent = parent;
	}
	/**如果logger不存在自己的level，則調用此方法獲得父logger的level*/
	public Level getParentLevel(Logger logger)
	{
		Logger parent = logger.parent;
		while(parent.getLevel()==null)
		{
			parent = parent.parent;
		}
		return parent.getLevel();
	}
	/**如果logger不存在自己的format，則調用此方法獲得父logger的format*/
	public Format getParentFormat(Logger logger)
	{
		Logger parentlogger = logger.parent;
		while(parentlogger.getFormat()==null)
		{
			parentlogger = parentlogger.parent;
		}
		return parentlogger.getFormat();
	}
	/**如果logger不存在自己的輸出地點，則調用此方法獲得父logger的輸出地點*/
	public ArrayList<Handler> getParentHandler(Logger logger)
	{
		Logger parentlogger = logger.parent;
		while(parentlogger.getHandlers().isEmpty())
		{
			parentlogger = parentlogger.parent;
		}
		return parentlogger.getHandlers();
	}
	/**每創建一個logger，則調用此方法更新所有logger的父logger*/
	private void updateParent()
	{
		Logger temp =null;
		Iterator it=table.keySet().iterator();
		while(it.hasNext()){
			temp = table.get(it.next());
			setParent(temp);
		}
	}
}