Drools规则取决于JDK Map中的知识(不在非JDK类之内) [英] Drools Rule depending on Knowledge from JDK Map (not within non-JDK Class)

问题描述

我正在尝试编写以下规则，这取决于下面的 main 中提供的知识，该知识仅使用JDK [library] Map(而不是非库类中的Map).但这似乎不起作用...

I'm trying to write the below Rule, which depends on Knowledge provided in the below main that uses just a JDK [library] Map (instead of a Map within a non-library Class). But it doesn't seem to be working...

主要方法:

Map<String, Float> mapa = new HashMap<String, Float>();
mapa.put("Height", (float)1.73);
mapa.put("Weight", (float)79.0);
mapa.put("BMI", mapa.get("Weight") /
                (mapa.get("Height") * mapa.get("Height")));
ksession.insert(mapa);

rule.drl:

rule "Low BMI"
    when
        $map : (Map(values("BMI")) < 18.0)
    then 
        System.out.println("You have a low BMI");
end

我想在规则前提条件内比较BMI的值，如果该条件为true，那么我想在下面显示消息.

I want to compare the value of BMI inside of rule precondition, if this condition is true, so I want to show the message below.

怎么了?

推荐答案

您应编写以下内容:

when
    $map: Map(this["BMI"] < 18)
then

应该可以:)

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