如何将Java静态方法导入Drools文件? [英] How to import Java static method into Drools file?

问题描述

java 类和静态方法代码为:

The java class and static method code is:

public class DroolsStringUtils {
    public static boolean isEmpty(String param) {
        if (param == null || "".equals(param)) {
            return true;
        }
        return false;
    }
}

drl 代码为:

package com.rules

import com.secbro.drools.utils.DroolsStringUtils.isEmpty;

rule CheckIsEmpty
  when
    isEmpty("");
  then
    System.out.println("the param is not empty");
  end

但是IDEA提示:

无法爱"在方法'isEmpty("))'上.

我只想将静态方法从 java 类导入到 drl 文件.

I just want to import a static method from java class to drl file.

推荐答案

使用import static 导入静态方法.

Use import static to import a static method.

import  static  com.secbro.drools.utils.DroolsStringUtils.isEmpty;
//      ^^^^^^

(已)，当然，您不能在需要模式的地方调用静态方法:

(edited:) and of course you cannot call a static method where a pattern is required:

rule CheckIsEmpty
when
    eval( isEmpty("") )
then
    System.out.println("the param is not empty");
end

(阅读Drools文档很有帮助.)

(It helps considerably to read the Drools documentation.)

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