How to define new matcher function?

I’ve written a function but now how should add it to function map?

public class InCollectionFunc extends AbstractFunction {
    public InCollectionFunc() {
    }

    public AviatorObject call(Map<String, Object> env, AviatorObject arg1, AviatorObject arg2, AviatorObject arg3) {
        String value = FunctionUtils.getStringValue(arg1, env);
        String collection = FunctionUtils.getStringValue(arg3, env);
        return AviatorBoolean.valueOf(isInCollection(value, collection));
    }

    private boolean isInCollection(String value,String collection) {
        System.out.println("value:" + value + " isIn collection:" + collection);
        return true;
    }

    public String getName() {
        return getNameStatic();
    }

    public static String getNameStatic() {
        return "isIn";
    }
}

enforcer = new Enforcer("erole.conf", "policy.csv");
enforcer.addFunction(InCollectionFunc.getNameStatic(),new InCollectionFunc());

[hsluoyz]

@M-Razavi jCasbin 1.2.0 has been released to Maven, may need some time for cache: https://mvnrepository.com/artifact/org.casbin/jcasbin

[hsluoyz]

@M-Razavi Aviator needs to release a new version before jCasbin can import it. You can ask its author to release one and I will release a new version jCasbin based on it.