code: public java.util.List<TransitGatewayAttachmentPropagation> getTransitGatewayAttachmentPropagations() {
          if (transitGatewayAttachmentPropagations == null) {
              transitGatewayAttachmentPropagations = new com.amazonaws.internal.SdkInternalList<TransitGatewayAttachmentPropagation>();
          }
          return transitGatewayAttachmentPropagations;
      }
docs: <p>
  Information about the propagation route tables.
  </p>
  
  @return Information about the propagation route tables.