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import java.util.Collection;
import java.util.Map;

/**
 * Ognl工具类，主要是为了在ognl表达式访问静态方法时可以减少长长的类名称编写 Ognl访问静态方法的表达式为:
 * \@class\@method(args) 示例使用:
 * 
 *  * 	<if test="\@Ognl\@isNotEmpty(userId)">
 * 	and user_id = #{userId}
 *  </if>
 * 
 */
@SuppressWarnings("all")
public class Ognl
{
	/**
	 * 可以用于判断String,Long,Integer,Double,Float,Map,Array,Collection是否为空
	 * @param o Object
	 * @return boolean
	 */
	public static boolean isEmpty(Object o) throws IllegalArgumentException
	{
		if(o == null)
		{
			return true;
		}
		if(o instanceof String)
		{
			if(((String) o).trim().length() == 0)
			{
				return true;
			}
		}
		else if(o instanceof Long)
		{
			if(((Long) o) == null)
			{
				return true;
			}
		}
		else if(o instanceof Integer)
		{
			if(((Integer) o) == null)
			{
				return true;
			}
		}
		else if(o instanceof Double)
		{
			if(((Double) o) == null)
			{
				return true;
			}
		}
		else if(o instanceof Float)
		{
			if(((Float) o) == null)
			{
				return true;
			}
		}
		else if(o instanceof Map)
		{
			if(((Map) o).isEmpty())
			{
				return true;
			}
		}
		else if(o.getClass().isArray())
		{
			if(((Object[]) o).length == 0)
			{
				return true;
			}
		}
		else if(o instanceof Collection)
		{
			if(((Collection) o).isEmpty())
			{
				return true;
			}
		}
		else
		{
			throw new IllegalArgumentException("Illegal argument type,must be : Map,Collection,Array,String,Long,Integer. but was:" + o.getClass());
		}
		return false;
	}

	/**
	 * 可以用于判断String,Long,Integer,Double,Float,Map,Array,Collection是否不为空
	 * @param o Object
	 * @return boolean
	 */
	public static boolean isNotEmpty(Object o)
	{
		return !isEmpty(o);
	}

	/**
	 * 可以用于判断是否为数值类型
	 * @param o Object
	 * @return boolean
	 */
	public static boolean isNumber(Object o)
	{
		if(o == null)
		{
			return false;
		}
		if(o instanceof Number)
		{
			return true;
		}
		if(o instanceof String)
		{
			try
			{
				Double.parseDouble((String) o);
				return true;
			}
			catch(NumberFormatException e)
			{
				return false;
			}
		}
		return false;
	}
}