PortletUtils.java 文件源码

/**
 * Return an appropriate request object of the specified type, if available,
 * unwrapping the given request as far as necessary.
 * @param request the portlet request to introspect
 * @param requiredType the desired type of request object
 * @return the matching request object, or {@code null} if none
 * of that type is available
 */
@SuppressWarnings("unchecked")
public static <T> T getNativeRequest(PortletRequest request, Class<T> requiredType) {
    if (requiredType != null) {
        if (requiredType.isInstance(request)) {
            return (T) request;
        }
        else if (request instanceof PortletRequestWrapper) {
            return getNativeRequest(((PortletRequestWrapper) request).getRequest(), requiredType);
        }
    }
    return null;
}