code: public ListDatasetsResult withDatasetSummaries(DatasetSummary... datasetSummaries) {
          if (this.datasetSummaries == null) {
              setDatasetSummaries(new java.util.ArrayList<DatasetSummary>(datasetSummaries.length));
          }
          for (DatasetSummary ele : datasetSummaries) {
              this.datasetSummaries.add(ele);
          }
          return this;
      }
docs: <p>
  A list of "DatasetSummary" objects.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setDatasetSummaries(java.util.Collection)} or {@link #withDatasetSummaries(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param datasetSummaries
  A list of "DatasetSummary" objects.
  @return Returns a reference to this object so that method calls can be chained together.