package com.changhong.epc.parsing.service.autosubmit.tool;

import java.util.Map;

import com.googlecode.aviator.AviatorEvaluator;

import com.changhong.epc.parsing.service.autosubmit.tool.function.Avg;
import com.changhong.epc.parsing.service.autosubmit.tool.function.Sum;

public class AviatorTool {
	
	static{
		// 子表单 聚合函数 总和
		AviatorEvaluator.addFunction(new Sum());
		// 子表单 聚合函数 平均值
		AviatorEvaluator.addFunction(new Avg());
	}
	
	public static <T> T execute(String expression, Map<String, Object> env, Class<T> clazz){
		return execute(expression, env, clazz, null);
	}
	
	@SuppressWarnings("unchecked")
	public static <T> T execute(String expression, Map<String, Object> env, Class<T> clazz, CallBack<T> call){
		try{
			return (T) AviatorEvaluator.compile(expression).execute(env);
		}catch (Exception e) {
			if(call != null)
				return call.error(e);
			return null;
		}
	}
	
	@FunctionalInterface
	public static interface CallBack<T>{
		
		T error(Exception e);
		
	}
	
}