Aviator(3) 自定义函数IF

ゞ浴缸里的玫瑰 2022-11-26 07:47 277阅读 0赞

### 一、前言 ###

1.  [Aviator(1) SpringBoot整合Aviator入门体验][Aviator_1_ SpringBoot_Aviator]
2.  [Aviator(2) 自定义函数ADD][Aviator_2_ _ADD]
3.  自定义函数和调用Java方法可参考：[https://www.yuque.com/boyan-avfmj/aviatorscript/xbdgg2][https_www.yuque.com_boyan-avfmj_aviatorscript_xbdgg2]

### 二、Aviator 自定义函数`IF` ###

public class TestAviator_IF { 
    
        public static void main(String[] args) { 
            // 注册函数`IF`
            AviatorEvaluator.addFunction(new Function_IF());
            Object execute1 = AviatorEvaluator.execute(" IF(1.0==1.0,100,200)");
            Object execute2 = AviatorEvaluator.execute("IF(1==1,IF(1>=2,10,20),IF(10<=20,30,40))");
            System.out.println(execute1);
            System.out.println(execute2);
        }
    
    }
    
    /** * <p> * Aviator 自定义函数`IF` * </p> * * @author : zhengqing * @description : 继承`com.googlecode.aviator.runtime.function.AbstractFunction`,并覆写对应参数个数的方法即可 * @date : 2020/8/11 9:15 */
    class Function_IF extends AbstractFunction { 
    
        /** * IF函数实现逻辑处理 * * @param env: * 当前执行的上下文 * @param arg1: * if函数中的判断逻辑 * @param arg2: * arg1为true时的结果 * @param arg3: * arg1为false时的结果 * @return: com.googlecode.aviator.runtime.type.AviatorObject * @author : zhengqing * @date : 2020/8/11 9:17 */
        @Override
        public AviatorObject call(Map<String, Object> env, AviatorObject arg1, AviatorObject arg2, AviatorObject arg3) { 
            Boolean ifResult = FunctionUtils.getBooleanValue(arg1, env);
            Number ifTrue = FunctionUtils.getNumberValue(arg2, env);
            Number ifFalse = FunctionUtils.getNumberValue(arg3, env);
            if (ifResult) { 
                return new AviatorDouble(ifTrue.doubleValue());
            } else { 
                return new AviatorDouble(ifFalse.doubleValue());
            }
        }
    
        /** * 返回方法名 */
        @Override
        public String getName() { 
            return "IF";
        }
    
    }

运行结果如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MjI1NTU4_size_16_color_FFFFFF_t_70]

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### 本文案例demo源码地址 ###

[https://gitee.com/zhengqingya/java-workspace][https_gitee.com_zhengqingya_java-workspace]

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> 今日分享语句：  
> 当热诚变成习惯，恐惧和忧虑即无处容身。缺乏热诚的人也没有明确的目标。热诚使想象的轮子转动。一个人缺乏热诚就象汽车没有汽油。善于安排玩乐和工作，两者保持热诚，就是最快乐的人。热诚使平凡的话题变得生动。

[Aviator_1_ SpringBoot_Aviator]: https://zhengqing.blog.csdn.net/article/details/107913810
[Aviator_2_ _ADD]: https://zhengqing.blog.csdn.net/article/details/107921112
[https_www.yuque.com_boyan-avfmj_aviatorscript_xbdgg2]: https://www.yuque.com/boyan-avfmj/aviatorscript/xbdgg2
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MjI1NTU4_size_16_color_FFFFFF_t_70]: /images/20221124/fa8b238dd44b48a6808ed0b5dbfe038e.png
[https_gitee.com_zhengqingya_java-workspace]: https://gitee.com/zhengqingya/java-workspace