PortletRequestAttributes.java 文件源码

@Override
public String[] getAttributeNames(int scope) {
    if (scope == SCOPE_REQUEST) {
        if (!isRequestActive()) {
            throw new IllegalStateException(
                    "Cannot ask for request attributes - request is not active anymore!");
        }
        return StringUtils.toStringArray(this.request.getAttributeNames());
    }
    else {
        PortletSession session = getSession(false);
        if (session != null) {
            if (scope == SCOPE_GLOBAL_SESSION) {
                return StringUtils.toStringArray(session.getAttributeNames(PortletSession.APPLICATION_SCOPE));
            }
            else {
                return StringUtils.toStringArray(session.getAttributeNames());
            }
        }
        else {
            return new String[0];
        }
    }
}