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package com.penglecode.common.util;

import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
/**
 * 集合类型的工具类
 * 
 * @author	  	pengpeng
 * @date	  	2014年7月19日 下午3:38:21
 * @version  	1.0
 */
public class CollectionUtils {

	/**
	 * 判断Collection集合是否为空
	 * 
	 * @param collection
	 * @return
	 */
	public static boolean isEmpty(Collection collection){
		return collection == null || collection.isEmpty();
	}
	
	/**
	 * 判断Map集合是否为空
	 * 
	 * @param map
	 * @return
	 */
	public static boolean isEmpty(Map map){
		return map == null || map.isEmpty();
	}
	
	/**
	 * 判断Collection集合中是否含有null元素
	 * 
	 * @param collection
	 * @return
	 */
	public static boolean containsNull(Collection collection){
		if(!isEmpty(collection)){
			for(Object obj : collection){
				if(obj == null){
					return true;
				}
			}
		}
		return false;
	}
	
	/**
	 * 过滤Collection集合中的null元素
	 * 
	 * @param collection
	 */
	public static void filterNull(Collection collection){
		if(!isEmpty(collection)){
			for(Iterator it = collection.iterator(); it.hasNext();){
				if(it.next() == null){
					it.remove();
				}
			}
		}
	}
	
}