code: public java.util.List<String> getDirectoryIds() {
          if (directoryIds == null) {
              directoryIds = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return directoryIds;
      }
docs: <p>
  A list of identifiers of the directories for which to obtain the information. If this member is null, all
  directories that belong to the current account are returned.
  </p>
  <p>
  An empty list results in an <code>InvalidParameterException</code> being thrown.
  </p>
  
  @return A list of identifiers of the directories for which to obtain the information. If this member is null, all
  directories that belong to the current account are returned.</p>
  <p>
  An empty list results in an <code>InvalidParameterException</code> being thrown.