UDF: how to get a value in the previous record when lopping over records?

Question

Hello
I have this challenge:
Source message:
<row>
  <ID>111</ID>
  <Score>200</Score>
  <Date>2010-01-01</Date>
</row>
<row>
  <ID>111</ID>
  <Score>230</Score>
  <Date>2010-01-02</Date>
</row>
<row>
  <ID>112</ID>
  <Score>230</Score>
  <Date>2010-01-03</Date>
</row>
etc...
Now the case is, that IF the value of ID of the current record (row) is equal to the value of the ID of the previous record AND the Score value of the current record is bigger than the Score value of the previous record THEN a record in the target message must be created with these values:
Target Message:
<row>
  <ID_target> value of source ID </ID_target>
  <Score_yesterday> Score value of previous record (day) </Score_yesterday>
  <Score_current_date> Score value of current record </Score_current_date>
  <Date_current> Date of current record  </Date_current>
</row>
I am thinking of using GlobalContainer to store the previous values but am note sure how to maintain these previous values. In addition, I am thinking about using a UDF on the target row record, which will just create the row, if conditions are met (result.addValue("");) and then just make a simple mapping of the ID_target, Score_current_date and Date_current fields and make an other UDF for the Score_yesterday field where I get the Score for the previous record using the GlobalContainer value, that I stored in the other UDF.
BUT:
Should I use "All values of context" or "All values of Queues" in the UDF used on the row record and how do I make sure, that the Score_yesterday global container value is maintained correctly? I am planning of setting it in the UDF used on the Target row record but will it then be in sync with the consuming UDF of the Score_yesterday field?
Java code to go into the UDF would be very much appreciated
Mikael

Answer 1

int tmp1;
int tmp2;
int len = ID.length;
for(int i =0;i< len;i++)
     if( i!= len-1)
         tmp1 = Integer.parseInt(Score<i>);
         tmp2 = Integer.parseInt(Score[i+1]);
               if(tmp2 >tmp1)
                 if (TARGET[0].equals("ROW"))
                          result.addValue("");
                      else if (TARGET[0].equals("ID_TARGET"))
                          result.addValue(ID[0]);
                     else if (TARGET[0].equals("SCORE_YDAY"))
                          result.addValue(Score<i>);
                     else if (TARGET[0].equals("SCORE_CDAY"))
                         result.addValue(Score[i+1]);
                     else
                         result.addValue(DT[i+1]);
I got the following results for the set of data that you provided.
Target-XML
<?xml version="1.0" encoding="UTF-8"?>
<ns0:MT_TestingTGT xmlns:ns0="http://monsanto.com/CIC">
   <Row>
      <ID_TARGET>571515198310502207</ID_TARGET>
      <SCORE_YDAY>1000</SCORE_YDAY>
      <SCORE_CDAY>1010</SCORE_CDAY>
      <CURRENT_DATE>2010-03-02 00:00</CURRENT_DATE>
   </Row>
   <Row>
      <ID_TARGET>571515198310502207</ID_TARGET>
      <SCORE_YDAY>1000</SCORE_YDAY>
      <SCORE_CDAY>1050</SCORE_CDAY>
      <CURRENT_DATE>2010-03-04 00:00</CURRENT_DATE>
   </Row>
   <Row>
      <ID_TARGET>571515198310502207</ID_TARGET>
      <SCORE_YDAY>1050</SCORE_YDAY>
      <SCORE_CDAY>1080</SCORE_CDAY>
      <CURRENT_DATE>2010-03-05 00:00</CURRENT_DATE>
   </Row>
   <Row>
      <ID_TARGET>571515198310502108</ID_TARGET>
      <SCORE_YDAY>2000</SCORE_YDAY>
      <SCORE_CDAY>2040</SCORE_CDAY>
      <CURRENT_DATE>2010-03-03 05:00</CURRENT_DATE>
   </Row>
   <Row>
      <ID_TARGET>571515198310502108</ID_TARGET>
      <SCORE_YDAY>2000</SCORE_YDAY>
      <SCORE_CDAY>2040</SCORE_CDAY>
      <CURRENT_DATE>2010-03-05 05:00</CURRENT_DATE>
   </Row>
   <Row>
      <ID_TARGET>571515198310302203</ID_TARGET>
      <SCORE_YDAY>3000</SCORE_YDAY>
      <SCORE_CDAY>3020</SCORE_CDAY>
      <CURRENT_DATE>2010-03-05 00:00</CURRENT_DATE>
   </Row>
</ns0:MT_TestingTGT>