package com.dy.common.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.Properties;

@SuppressWarnings("unused")
public class ConfigProperties {
	private static HashMap<String, String> properties = new HashMap<>();
	
	private ConfigProperties() {
	}
	
	/**
	 * 是否有属性了
	 * @return 存在属性配置返回true，否则返回false
	 */
	public static boolean hasProperties(){
		return properties != null && properties.size() > 0;
	}
	
	/**
	 * 根据配置名称得到配置值
	 * 
	 * @param name 属性名
	 * @return 属性值
	 */
	public static String getConfig(String name) {
		if (properties == null) {
			return null;
		}
		if(name.trim().equals("")){
			return "" ;
		}
		return properties.get(name);
	}

	/**
	 * 初始化配置
	 * 
	 * @param in 输入流
	 * @param repeatCover 是否重复
	 * @throws Exception  抛出异常
	 */
	public static void init(InputStream in, boolean repeatCover) throws Exception {
		if(in == null){
			throw new Exception("属性配置文件不存在！") ;
		}
		if(properties.size() > 0){
			if(repeatCover){
				parseProperties(in);		
			}
		}else{
			parseProperties(in);		
		}
	}

	/**
	 * 重新初始化
	 * 
	 * @param in 输入流
	 * @throws Exception 抛出异常
	 */
	public static void reInit(InputStream in) throws Exception {
		properties = new HashMap<>();
		parseProperties(in);
	}
	
	
	private static void parseProperties(InputStream in) throws IOException{
		 Properties prop = new Properties();         
		 prop.load(in); 
		 Iterator<Entry<Object, Object>> it = prop.entrySet().iterator() ;
		 Entry<Object, Object> entry ;
		 while(it.hasNext()){
			 entry = it.next() ;
			 properties.put((String)entry.getKey(), (String)entry.getValue()) ;
		 }
	}
}