PortletUtils.java 文件源码

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