void ConvertLinkedGeoPolygonToManaged()

in src/main/c/h3-java/src/jniapi.c [603:682]
68 lines of code
14 McCabe index (conditional complexity)

void ConvertLinkedGeoPolygonToManaged(JNIEnv *env,
                                      LinkedGeoPolygon *currentPolygon,
                                      jobject results) {
    jclass arrayListClass = (**env).FindClass(env, "java/util/ArrayList");
    if (arrayListClass == NULL) {
        ThrowOutOfMemoryError(env);
        return;
    }
    jclass latLngClass = (**env).FindClass(env, "com/uber/h3core/util/LatLng");
    if (latLngClass == NULL) {
        ThrowOutOfMemoryError(env);
        return;
    }
    jmethodID arrayListConstructor =
        (**env).GetMethodID(env, arrayListClass, "<init>", "()V");
    if (arrayListConstructor == NULL) {
        ThrowOutOfMemoryError(env);
        return;
    }
    jmethodID arrayListAdd = (**env).GetMethodID(env, arrayListClass, "add",
                                                 "(Ljava/lang/Object;)Z");
    if (arrayListAdd == NULL) {
        ThrowOutOfMemoryError(env);
        return;
    }
    jmethodID latLngConstructor =
        (**env).GetMethodID(env, latLngClass, "<init>", "(DD)V");
    if (latLngConstructor == NULL) {
        ThrowOutOfMemoryError(env);
        return;
    }

    while (currentPolygon != NULL) {
        jobject resultLoops =
            (**env).NewObject(env, arrayListClass, arrayListConstructor);
        if (resultLoops == NULL) {
            return;
        }

        // Check if the polygon is empty.
        // Don't have to do this other times because a loop can be gauranteed
        // to have coordinates.
        if (resultLoops != NULL && currentPolygon->first != NULL) {
            LinkedGeoLoop *currentLoop = currentPolygon->first;
            while (currentLoop != NULL) {
                jobject resultLoop = (**env).NewObject(env, arrayListClass,
                                                       arrayListConstructor);
                if (resultLoop == NULL) {
                    return;
                }

                LinkedLatLng *coord = currentLoop->first;
                while (coord != NULL) {
                    jobject v =
                        (**env).NewObject(env, latLngClass, latLngConstructor,
                                          coord->vertex.lat, coord->vertex.lng);
                    if (v == NULL) {
                        return;
                    }

                    (**env).CallBooleanMethod(env, resultLoop, arrayListAdd, v);
                    RETURN_ON_EXCEPTION(env);

                    coord = coord->next;
                }

                (**env).CallBooleanMethod(env, resultLoops, arrayListAdd,
                                          resultLoop);
                RETURN_ON_EXCEPTION(env);

                currentLoop = currentLoop->next;
            }

            (**env).CallBooleanMethod(env, results, arrayListAdd, resultLoops);
            RETURN_ON_EXCEPTION(env);
        }

        currentPolygon = currentPolygon->next;
    }
}