About string function

Question

Hi Experts,
in my scenario there is a value that is comming from source need to be substring depending on some condition eg: Electrical:Cable as per the req we need only Cable this could be achived by using the substring function but if there is a null value comming from the source then it should write a null at the target
but when we are using substring function to get the value eg Cable it works fine but when there is a null value it throws a error  on substring function
can anyone provide the inputs as the req is critical
Thanks
Sampath

Answer 1

Hi venkat,
Use the Below UDF(SubString). It works fine, even when the input given is null.
SourceField->UDF->TargetField
public static String SubString(String sInput, int iStartIndex, int iNoOfChars) {
          int iLen = 0;
          int iEndIndex = 0;
          try {
               iLen = sInput.length();
               iEndIndex = iStartIndex + iNoOfChars;
               if (iStartIndex > iLen)
                    return "";
               if (iEndIndex > iLen)
                    iEndIndex = iLen;
          } catch (Exception e) {
               return "";
          return sInput.substring(iStartIndex, iEndIndex);
Regards,
Swetha.