import javafx.application.Application;
import javafx.css.CssMetaData;
import javafx.css.Styleable;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.BorderWidths;
import javafx.stage.Stage;

import java.util.ArrayList;
import java.util.List;

public class StylesTest extends Application{


    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) throws Exception {
        final AnchorPane pane = new AnchorPane();
        getListWithSubProperty(AnchorPane.getClassCssMetaData())
                .stream().filter((e) -> "-fx-border-image-width".equals(e.getProperty()))
        .forEach((e) -> {
            CssMetaData<AnchorPane, BorderWidths[]> cssMetaData = (CssMetaData<AnchorPane, BorderWidths[]>) e;
            BorderWidths[] widths = cssMetaData.getInitialValue(pane);
            System.out.println(widths[0].getTop() + ", " + widths[0].getRight() + ", " + widths[0].getBottom() + ", " + widths[0].getLeft());
        });
    }


    private List<CssMetaData<? extends Styleable, ?>> getListWithSubProperty(List<CssMetaData<? extends Styleable, ?>> list) {
        ArrayList<CssMetaData<? extends Styleable, ?>> newList = new ArrayList<>(list);
        for (CssMetaData data : list) {
            List<CssMetaData<? extends Styleable, ?>> sub = data.getSubProperties();
            if (sub != null && sub.size() > 0) {
                newList.addAll(getListWithSubProperty(sub));
            }
        }
        return newList;
    }
}