code: public java.util.List<String> getCustomerGatewayIds() {
          if (customerGatewayIds == null) {
              customerGatewayIds = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return customerGatewayIds;
      }
docs: <p>
  One or more customer gateway IDs.
  </p>
  <p>
  Default: Describes all your customer gateways.
  </p>
  
  @return One or more customer gateway IDs.</p>
  <p>
  Default: Describes all your customer gateways.