Udf to pass constant corrsponding to 2 file names from different location

if i have one source file, i m able to pass the file name directly to the target through the udf below:
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
String ourSourceFileName = conf.get(key);
return ourSourceFileName;
But i have 2 files from different location. Now both files has dates at the end. how can i pass AAA for File1.txt and BBB for File2.txt. .
after the above code, i have included below code too, but not working(*-for date n timestamps):
if(ourSourceFileName.equals("ABC*.txt"))
return "FILE1";
else if(ourSourceFileName.equals("XYZ*.txt"))
return "FILE2";
please suggest

Hi Basker,
Error in activating object in IR - heres the total code i have used for this purpose. plz help in getting this.
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
String ourSourceFileName = conf.get(key);
return ourSourceFileName;
if(ourSourceFileName.equals("SOURCE_1*.txt"))
return "File1";
else if(ourSourceFileName.equals("SOURCE_2*.txt"))
return "File2";
Source code has syntax error: /usr/sap/DXI/DVEBMGS31/j2ee/cluster/server0/./temp/classpath_resolver/Map27461f402eff11e0898d00144f1e71f0/source/com/sap/xi/tf/_MM_UPDATE_.java:839: unreachable statement if(ourSourceFileName.equals("SOURCE1_*.txt")) ^ /usr/sap/DXI/DVEBMGS31/j2ee/cluster/server0/./temp/classpath_resolver/Map27461f402eff11e0898d00144f1e71f0/source/com/sap/xi/tf/_MM_UPDATE_.java:844: missing return statement } ^ 2 errors

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