topic Simple transformation call-method variable bindings in Application Development and Automation Discussions

Simple transformation call-method variable bindings

former_member121087 — Wed, 02 Mar 2022 15:41:47 GMT

Hi,

In a simple transformation program (internal table data to XML string) is it possible to control the value of an XML's element with the call-method tag? What I'm trying to do, further explained.

Here's my attempt at changing the output value of an XML element using the call-method tag by following this example:

If I understood the documentation correctly, the tag <tt:root name="SPFLI_TAB"> is bound to the static attribute SPFLI_TAB of class CL_DEMO_CALL_FROM_ST and calling its method GET_FLIGHTS updates the value of said attribute which changes the root in the ST which is referenced in the tag <tt:loop ref=".SPFLI_TAB">.

The class ZTEST_SIMPLE_TRANSFORMATION is a copy of the example's class with a new static attribute CURRCODE_CHANGED and static method CONCAT_1 (concatenates '_1' to the given string). I want the value of element <CURRCODE_CHANGED> to be modified by the method.

<?sap.transform simple?>
<tt:transform xmlns:tt="http://www.sap.com/transformation-templates">
  <tt:root name="SCARR_TAB"/>
  <tt:root name="SPFLI_TAB"/>
  <tt:variable name="carrid"/>

  <!-- NEW -->
  <tt:root name="CURRCODE_CHANGED"/>
  <tt:variable name="currcode_og"/>
  <!-- NEW -->

  <tt:template>
    <FlightList>
      <tt:loop ref=".SCARR_TAB">
        <Flights>

          <!-- NEW -->
          <tt:call-method class="ZTEST_SIMPLE_TRANSFORMATION" s-name="CONCAT_1">
            <tt:with-parameter name="IV_STRING" var="currcode_og"/>
          </tt:call-method>
          <CURRCODE_CHANGED>
            <tt:value ref=".CURRCODE_CHANGED"/>
          </CURRCODE_CHANGED>
          <!-- NEW -->

          <tt:assign ref="carrid" to-var="carrid"/>
          <tt:call-method class="CL_DEMO_CALL_FROM_ST" s-name="GET_FLIGHTS">
            <tt:with-parameter name="CARRID" var="carrid"/>
          </tt:call-method>
          <tt:loop ref=".SPFLI_TAB">
            <Connection>
              <tt:attribute name="ID" value-ref="CONNID"/>
              <From>
                <tt:value ref="CITYFROM"/>
              </From>
              <To>
                <tt:value ref="CITYTO"/>
              </To>
            </Connection>
          </tt:loop>
        </Flights>
      </tt:loop>
    </FlightList>
  </tt:template>

</tt:transform>

But when I execute the MAIN method, I get reference error:

The exception CX_ST_REF_ACCESS was raised within the method call of the include ZTEST_ST_WITH_METHOD_CALL in ZTEST_ST_WITH_METHOD_CALL in line 18.

Am I missing something?

Thank you and kind regards,

Emiliano

Re: Simple transformation call-method variable bindings

Sandra_Rossi — Wed, 02 Mar 2022 20:13:41 GMT

I don't really get what you're trying to do (please clarify), but as a starting point you can change it this way, so that the variable "currcode_og" contains "test_1" after calling the method:

<tt:call-method class="ZTEST_SIMPLE_TRANSFORMATION" s-name="CONCAT_1">
    <tt:with-parameter name="IV_STRING" val="'test'"/>
    <tt:with-parameter name="CURRCODE_CHANGED" var="currcode_og"/>
</tt:call-method>

Re: Simple transformation call-method variable bindings

former_member121087 — Thu, 03 Mar 2022 11:54:51 GMT

Hi Sandra,

The internal table SCARR_TAB has the field CURRCODE. Within the loop <tt:loop ref=".SCARR_TAB">, if I remove the call-method and reference CURRCODE (like this <tt:value ref="CURRCODE"/>, for example) it shows its value for each entry of SCARR_TAB as expected. What I want to do is modify CURRCODE for each entry of SCARR_TAB during the transformation so that the resulting value of CURRCODE in the XML contains the concatenated '_1'.

I'm trying to see whether it's possible to manipulate the abap data during the transformation so that I could, for example, format a date in whatever way I wanted. I hope I can do this by calling a method and changing the string there.

As you've suggested, I've tried adding the attribute val="test" to the parameter tag but it wont compile; I get the error "illegal value".

BR,

Emiliano

Re: Simple transformation call-method variable bindings

Sandra_Rossi — Thu, 03 Mar 2022 15:17:43 GMT

sorry:

<tt:call-method class="ZTEST_SIMPLE_TRANSFORMATION" s-name="CONCAT_1">
    <tt:with-parameter name="IV_STRING" val="'test'"/>
    <tt:with-parameter name="CURRCODE_CHANGED" var="currcode_og"/>
</tt:call-method>