How to COUNT all data Characters in an IDOC ?

Hi All,
I am doing an IDOC-->File scenario.
As per the Third party system requirements, I need to COUNT all the Data characters (Minus the EDIDC record) and write this value at the end of the trailer record in the file.
Example:
EDIDC--> SAPR3, LS...
E1KNA1M-->SHIRIN, UK, SW1DPL
E1KNBKM-->SHIRIN, CITIBANK
So in this example I should sum up(COUNT) all the characters(of Data) belonging to segment E1KNA1m and E1KNBKM. So here COUNT is '28'. So I need to write the value '28' at the end of the file.
I want to know, is it possible to count data in XI mapping or should this be done in R/3 itself and appended as a COUNT field to the IDOC.
Appreciate any suggestion help on this. All I want to know which is the best practise/place to count the data characters in this scenario.
Thanks
Shirin

Hi,
Thanks for explaining.Really appreciated.
Just to confirm,
in Java edit Section I have added the following data: Please let me know if that is correct.
Imports:
Global Variables: len
Initilisation section: 0
Clean-up:
Similarly in UDF I have entered the following data:
Label/Description: Calculate length
Cache: Value(radiobutton)
Arguments: a
Next screen:
Imports:
public String Calculate(String a, Container container)
Then entered ur code.
When I save and activate I get the following error
Starting compilation Source code has syntax error: D:/usr/sap/XRD/DVEBMGS02/j2ee/cluster/server0/./temp/classpath_resolver/Map2494b0c0596b11dda115001a4b52813a/source/com/sap/xi/tf/_MM_ALLOCATION_RESPONSE_.java:32: <identifier> expected public /*!_$ClNRep_*/_MM_ALLOCATION_RESPONSE_(){} ^ D:/usr/sap/XRD/DVEBMGS02/j2ee/cluster/server0/./temp/classpath_resolver/Map2494b0c0596b11dda115001a4b52813a/source/com/sap/xi/tf/_MM_ALLOCATION_RESPONSE_.java:210: ';' expected } ^ 2 errors
Appreciate if you could help.
Thanks
Shirin

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