code: public AccountAggregationSource withAwsRegions(String... awsRegions) {
          if (this.awsRegions == null) {
              setAwsRegions(new com.amazonaws.internal.SdkInternalList<String>(awsRegions.length));
          }
          for (String ele : awsRegions) {
              this.awsRegions.add(ele);
          }
          return this;
      }
docs: <p>
  The source regions being aggregated.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setAwsRegions(java.util.Collection)} or {@link #withAwsRegions(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param awsRegions
  The source regions being aggregated.
  @return Returns a reference to this object so that method calls can be chained together.