Udf for exists

I have to concat 14 Idoc text fields into a string at a varying position. Mostly some of the fields are not assigned, a normal concat does not work(no output if one field is missing). I created a workaround with the exists function (graphical) which is about 25 meter long (my colleague imediately started to cry). It works but it is ugly.
Does anybody know how the exists function works. If one of the IDoc fields is missing I do not get any output of my udf whatever I do inside. How can I change this.
Regards, Thomas

Hi Thomas,
You can handle the absence of values in two ways.
1. Using MapWithDefault Standard function.
Field1- MapWithDefault(Default value single space)->
 ->Concat/UDF -> TargetField
 Field2- MapWithDefault(Default value single space)->
2. In UDF check for SUPPRESS value like this:
public String UDF_Name(String StrVal1,String StrVal2,Container container){
 if((!StrVal1.equals(ResultList.SUPPRESS)) && (!StrVal1.equals(ResultList.SUPPRESS)) ){
 //concat...
Hope this helps.
Regards,
Ananth

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16:24:08 Start of test
Source code has syntax error: /usr/sap/XD1/DVEBMGS30/j2ee/cluster/server0/./temp/classpath_resolver/Map283041f0edf311dd960b0003bacd2461/source/com/sap/xi/tf/_MM_INT012_INVOICE_DET_.java:598: 'class' or 'interface' expected public void TaxValues$(String[] a,String[] b,ResultList result,Container container){ ^ /usr/sap/XD1/DVEBMGS30/j2ee/cluster/server0/./temp/classpath_resolver/Map283041f0edf311dd960b0003bacd2461/source/com/sap/xi/tf/_MM_INT012_INVOICE_DET_.java:618: 'class' or 'interface' expected } ^ /usr/sap/XD1/DVEBMGS30/j2ee/cluster/server0/./temp/classpath_resolver/Map283041f0edf311dd960b0003bacd2461/source/com/sap/xi/tf/_MM_INT012_INVOICE_DET_.java:619: 'class' or 'interface' expected ^ 3 errors Source code has syntax error: /usr/sap/XD1/DVEBMGS30/j2ee/cluster/server0/./temp/classpath_resolver/Map283041f0edf311dd960b0003bacd2461/source/com/sap/xi/tf/_MM_INT012_INVOICE_DET_.java:598: 'class' or 'interface' expected public void TaxValues$(String[] a,String[] b,ResultList result,Container container){ ^ /usr/sap/XD1/DVEBMGS30/j2ee/cluster/server0/./temp/classpath_resolver/Map283041f0edf311dd960b0003bacd2461/source/com/sap/xi/tf/_MM_INT012_INVOICE_DET_.java:618: 'class' or 'interface' expected } ^ /usr/sap/XD1/DVEBMGS30/j2ee/cluster/server0/./temp/classpath_resolver/Map283041f0edf311dd960b0003bacd2461/source/com/sap/xi/tf/_MM_INT012_INVOICE_DET_.java:619: 'class' or 'interface' expected ^ 3 errors
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