Flat file to deep XML – using an UDF

‘File Content Conversion‘ OR ‘MessageTransformBean‘ in sender channel can produce a 4 level deep XML, maximum.

If expected XML is more than 4 level deep.

Solution: – Develop FCC or MTB to read each line of input.

Map using an UDF, to split each line to corresponding field.

UDF code: – ‘Execution Type’ : ‘All Values of a Context’.

public void udf_Shopping(String[] eachLine, ResultList Customer, ResultList Name, ResultList ID, ResultList Order, ResultList OrderNumber, ResultList OrderNote, ResultList LineItem, ResultList LineNumber, ResultList Material, ResultList TaxLine, ResultList Type, ResultList Amount, Container container) throws StreamTransformationException{
int countCust = 0, countOrdr = 0, countLine = 0;
String values[];
for (String line : eachLine) {
    values = line.split(",");
    if (line.startsWith("Cust")) {
        Customer.addValue("");
        Name.addValue(values[1]);  Name.addContextChange();
        ID.addValue(values[2]);    ID.addContextChange();
        //Add context change form second Customer.
        if (countCust > 0) {       Order.addContextChange();  }
        countCust++;
    } else if (line.startsWith("Ordr")) {
        Order.addValue("");
        OrderNumber.addValue(values[1]);  OrderNumber.addContextChange();
        OrderNote.addValue(values[2]);    OrderNote.addContextChange();
        //Add context change form second Order.
        if (countOrdr > 0) {              LineItem.addContextChange();  }
        countOrdr++;
    } else if (line.startsWith("Line")) {
        LineItem.addValue("");
        LineNumber.addValue(values[1]);  LineNumber.addContextChange();
        Material.addValue(values[2]);    Material.addContextChange();
        //Add context change form second LineItem.
        if (countLine > 0) {             TaxLine.addContextChange();        }
        countLine++;
    } else if (line.startsWith("Taxl")) {
        TaxLine.addValue("");
        Type.addValue(values[1]);    Type.addContextChange();
        Amount.addValue(values[2]);  Amount.addContextChange();
    }
}
}

Note:-

Comma(delimiter), ‘Cust’, ‘Ordr’, ‘Line’ and ‘Taxl’ arbitrary values are used to demonstrate the concept.

If some fields are optional in input, to avoid ArrayIndexOutOfBoundsException append delimiters.

for (String line : eachLine) {

    line = line + “,,,–“; //Append “,,,–” commas for optional fields.

    values = line.split(“,”);

  ….

}

If input is fixed length file (instead of delimited), use java String method substring(int beginIndex, int endIndex).

FYI.

Deep XML to Flat file – using an UDF

Other solution available on SCN.

XSLT approach – Flat File to Deep XMLDeepFCCBean – Flat File to Deep XML

Convert Flat File to Deeply XML Using Graphical Mapping