Use this to pull the flow file attributes into groovy:
def path = flowFile.getAttribute('path')
def filename = flowFile.getAttribute('filename')After that it is pure groovy string manipulation to add to column, remove values, etc
Note when you tokenize you have an List where each field is indexed (e.g. a[0], a[1] etc. To add a field you would use a.add(path). After adding new fields or manipulating old fields you would have to reconstruct the string as tab-delim record.
You would then have to write to the OutputStream, catch errors, and set the session failure or success.
This is code is similar to what you would do. (This code emits each record as a flowfile; if you wanted to emit the full recordset you would concatenate each record into one string with a newline at the end of each record except the end.)
import org.apache.commons.io.IOUtils
import java.nio.charset.*
def flowFile = session.get()
if(!flowFile) return
def path = flowFile.getAttribute('path')
def fail = false
flowFile = session.write(flowFile, {inputStream, outputStream ->
try {
def recordIn = IOUtils.toString(inputStream, StandardCharsets.UTF_8)
def cells = recordIn.split(',')
def recordOut = cells[0]+','+
cells[1]+','+ //you could validate this or any field
cells[2]+','+
path+','+
cells[3]+','+
cells[4]+','+
cells[5]+','+
cells[6]+','+
cells[7]
outputStream.write(recordOut.getBytes(StandardCharsets.UTF_8))
recordOut = ''
}
catch(e) {
log.error("Error during processing of validate.groovy", e)
session.transfer(inputStream, REL_FAILURE)
fail=true
}
} as StreamCallback)
if(fail){
session.transfer(flowFile, REL_FAILURE)
fail = false
} else {
session.transfer(flowFile, REL_SUCCESS)
}
