Get filename and directory name during runtime

Question

Hi guys,
I am developing a file to file interface without content conversion, just a simple file transfer from one ftp server to another. I have to read the same filename (invent.txt) from multiple folders (mstransfer/M01/IN1, mstransfer/M02/IN1, mstransfer/M03/IN1....) that represent different stores and transfer it as it is with the same name to exactly the same directory name in the target ftp location.
My problem is found inside a dummy mapping that I have created in order to specify the target directory and the name of the file. I am doing the following:
A) A Java UDF to specify the filename
trace = container.getTrace();
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
String filename = conf.get(key);
trace.addWarning("filename = "+filename);
conf.put(key, filename);
return "";
//return filename;
B) A Java UDF to specify the directory name
   //write your code here
trace = container.getTrace();
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","Directory");
String directory  = conf.get(key);
trace.addWarning("directory before = "+directory);
directory = "/usr/sap/trans"+directory;
trace.addWarning("directory after = "+directory);
conf.put(key, directory);
return "";
//return "/usr/sap/trans"+directory;
In receiver file adapter I do not specify neither a filename nor a target directory.
When I am testing it, I always get a mapping runtime error.
Any ideas?
--Evaggelos

Answer 1

Guys,
First of all, I am doing an end to end testing, i.e. I let the FTP adapter pick the file up and another FTP adapter delivers the file to target folder. I am definitely not testing the mapping in mapping editor.
I get the error in Request message mapping (pipeline step, which I can see in SXMB_MONI transaction) which is a dummy mapping between two message types that I have created and are based on two data types with two fields each.
The UDF's that I have created go in-between the source and target fileds of the message types/data types.
The error that I see in the trace section of the XML message in SXMB_MONI is the following:
"<Trace level="1" type="T">RuntimeException during appliction Java mapping com/sap/xi/tf/_MM_G_SRS_FileTransfer_MNS_</Trace>
  <Trace level="1" type="T">java.lang.NullPointerException at com.sap.aii.mappingtool.tf3.AMappingProgram.exceptionCaught$(AMappingProgram.java:59) at com.sap.aii.mappingtool.tf3.Transformer.checkParserException(Transformer.java:182) at com.sap.aii.mappingtool.tf3.Transformer.start(Transformer.java:149) at com.sap.aii.mappingtool.tf3.AMappingProgram.execute(AMappingProgram.java:102) at com.sap.aii.ibrun.server.mapping.JavaMapping.executeStep(JavaMapping.java:64) at com.sap.aii.ibrun.server.mapping.Mapping.execute(Mapping.java:91) at com.sap.aii.ibrun.server.mapping.MappingHandler.run(MappingHandler.java:90) at com.sap.aii.ibrun.sbeans.mapping.MappingRequestHandler.handleMappingRequest(MappingRequestHandler.java:95) at"
I have included some trace.addWarning() lines in Java code to help me debug my code, but I cannot see them anywhere inside the trace to be getting executed.
I will try Bhavesh's idea and I will write the code in the Java Section of my message mapping ( either Intialization or Destrcution ) section.