code: public final ListDataSourcesPagedResponse listDataSources(ParentName parent) {
      ListDataSourcesRequest request =
          ListDataSourcesRequest.newBuilder()
              .setParent(parent == null ? null : parent.toString())
              .build();
      return listDataSources(request);
    }
docs: Lists supported data sources and returns their settings, which can be used for UI rendering.
  
  <p>Sample code:
  
  <pre><code>
  try (DataTransferServiceClient dataTransferServiceClient = DataTransferServiceClient.create()) {
  ParentName parent = ProjectName.of("[PROJECT]");
  for (DataSource element : dataTransferServiceClient.listDataSources(parent).iterateAll()) {
  // doThingsWith(element);
  }
  }
  </code></pre>
  
  @param parent The BigQuery project id for which data sources should be returned. Must be in the
  form: `projects/{project_id}`
  @throws com.google.api.gax.rpc.ApiException if the remote call fails