code: public ListDatasetContentsResult withDatasetContentSummaries(DatasetContentSummary... datasetContentSummaries) {
          if (this.datasetContentSummaries == null) {
              setDatasetContentSummaries(new java.util.ArrayList<DatasetContentSummary>(datasetContentSummaries.length));
          }
          for (DatasetContentSummary ele : datasetContentSummaries) {
              this.datasetContentSummaries.add(ele);
          }
          return this;
      }
docs: <p>
  Summary information about data set contents that have been created.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setDatasetContentSummaries(java.util.Collection)} or
  {@link #withDatasetContentSummaries(java.util.Collection)} if you want to override the existing values.
  </p>
  
  @param datasetContentSummaries
  Summary information about data set contents that have been created.
  @return Returns a reference to this object so that method calls can be chained together.