BeanContextSupport.java 文件源码

/**
 * <p>
 * This method is typically called from the environment in order to determine
 * if the implementor "needs" a GUI.
 * </p>
 * <p>
 * The algorithm used herein tests the BeanContextPeer, and its current children
 * to determine if they are either Containers, Components, or if they implement
 * Visibility and return needsGui() == true.
 * </p>
 * @return {@code true} if the implementor needs a GUI
 */
public synchronized boolean needsGui() {
    BeanContext bc = getBeanContextPeer();

    if (bc != this) {
        if (bc instanceof Visibility) return ((Visibility)bc).needsGui();

        if (bc instanceof Container || bc instanceof Component)
            return true;
    }

    synchronized(children) {
        for (Iterator<Object> i = children.keySet().iterator(); i.hasNext();) {
            Object c = i.next();

            try {
                    return ((Visibility)c).needsGui();
                } catch (ClassCastException cce) {
                    // do nothing ...
                }

                if (c instanceof Container || c instanceof Component)
                    return true;
        }
    }

    return false;
}