How can I convert this UDF to be Dynamic?

Question

Hi there I have this UDF that calls a RFC, currently you can specify which table you want to read from and some input parameters. Could someone help me modify this so that I can specify which RFC to call? It only has to have 1 input parameter so not to worry about that. I am trying to change it to another RFC but it does not work. Heres the original UDF calling a static RFC with any table:
// declare parameters
String returnValue = "";
String rfcXML = "<?xml version=\"1.0\" encoding=\"UTF-8\"?> <ns0:RFC_READ_TABLE xmlns:ns0=\"urn:sap-com:document:sap:rfcfunctions\"><QUERY_TABLE>ZMAPPING_TABLE</QUERY_TABLE><DATA></DATA><FIELDS></FIELDS><OPTIONS><item><TEXT>EAN_UPC =  '"EAN_UPC"'</TEXT></item></OPTIONS></ns0:RFC_READ_TABLE>";
AbstractTrace trace = container.getTrace();
RfcAccessor accessor = null;
ByteArrayOutputStream out = null;
try
// 1. Determine a communication channel (Business system + Communication channel)
Channel channel = LookupService.getChannel(businessSystem,communicationChannel);
// 2. Get a RFC accessor for the channel.
accessor = LookupService.getRfcAccessor(channel);
// 3. Create an XML input stream that represents the RFC request message.
InputStream inputStream = new ByteArrayInputStream(rfcXML.getBytes());
// 4. Create the XML Payload
XmlPayload payload = LookupService.getXmlPayload(inputStream);
// 5. Execute the lookup.
Payload result = null;
result = accessor.call(payload);
InputStream in = result.getContent();
// 6. Create a DOM structure from the input XML
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(in);
NodeList list = document.getElementsByTagName("WA"); // The lookupValue is available as WA tag in the response
Node node = list.item(0);
if (node != null) {
node = node.getFirstChild();
if (node != null) {
returnValue = node.getNodeValue();
// 7. To free resources, close the accessor..
if (accessor!=null) {
try {
accessor.close();
} catch (LookupException e) {
trace.addWarning("Error while closing accessor " + e.getMessage() );
} catch (Exception e) {
trace.addWarning("Error" + e);
// 8. return a single id value to the message mapping
return returnValue;
And here is the one I have dynamically calling a RFC:
// declare parameters
String returnValue = "";
String rfcXML = "<?xml version=\"1.0\" encoding=\"UTF-8\"?> <ns0:" + RFC_NAME + " xmlns:ns0=\"urn:sap-com:document:sap:rfcfunctions\"><INPUT_PAR>Input_Value</INPUT_PAR></ns0:" + RFC_NAME + ">";
AbstractTrace trace = container.getTrace();
RfcAccessor accessor = null;
ByteArrayOutputStream out = null;
try
// 1. Determine a communication channel (Business system + Communication channel)
Channel channel = LookupService.getChannel(businessSystem,communicationChannel);
// 2. Get a RFC accessor for the channel.
accessor = LookupService.getRfcAccessor(channel);
// 3. Create an XML input stream that represents the RFC request message.
InputStream inputStream = new ByteArrayInputStream(rfcXML.getBytes());
// 4. Create the XML Payload
XmlPayload payload = LookupService.getXmlPayload(inputStream);
// 5. Execute the lookup.
Payload result = null;
result = accessor.call(payload);
InputStream in = result.getContent();
// 6. Create a DOM structure from the input XML
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(in);
NodeList list = document.getElementsByTagName("WA"); // The lookupValue is available as WA tag in the response
Node node = list.item(0);
if (node != null) {
node = node.getFirstChild();
if (node != null) {
returnValue = node.getNodeValue();
// 7. To free resources, close the accessor..
if (accessor!=null) {
try {
accessor.close();
} catch (LookupException e) {
trace.addWarning("Error while closing accessor " + e.getMessage() );
} catch (Exception e) {
trace.addWarning("Error" + e);
// 8. return a single id value to the message mapping
return returnValue;
Thanks,
Jan

Answer 1

1)You can check the Second RFC Response Structure using SE37.
Check export structure using Display code.
2)Second way.......
Change the code here
if (node != null) {
returnValue = node.getNodeValue();
if (node != null) {
returnValue = node.getNodeValue();
}else
returnValue = "No WA tag in response";
Now execute the mapping using Test Tab. Now you should see "No WA tag in response" in the target structure for the mapped field.
Edited by: Praveen Gujjeti on Mar 16, 2009 5:26 PM