Groovy to validate if Node exists or not - groovy

Question

I'm trying to validate in Groovy if a node came from an external system, if the external system has a value the node comes with a value, if the system dont have a value the node doesn't come in the payload.
Based on this i need to change/correct if its a NEW or UPDATE process for that record in an existing node.
Incoming XML is:
<urn:ExternalReqForApprovalImportRequest xmlns:urn="urn:Ariba:Buyer:vrealm_1" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xs="http://www.w3.org/2001/XMLSchema" partition="" variant="">
<urn:ExternalReqForApprovalInput_Item>
<urn:item>
<urn:Name>TEST</urn:Name>
<urn:Operation>XXXXXX</urn:Operation>
<urn:HeaderExtrinsics>
<Extrinsics>
<Extrinsic name="PRRefID">THIS IS THE NODE THAT MAY OR NOT MAY COME</Extrinsic>
<Extrinsic name="XXXXXXX">Value</Extrinsic>
<Extrinsic name="AnotherField">TValue</Extrinsic>
</Extrinsics>
</urn:HeaderExtrinsics>
</urn:item>
</urn:ExternalReqForApprovalInput_Item>
</urn:ExternalReqForApprovalImportRequest>
I created this groovy:
import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;
import java.lang.String;
def Message processData(Message message) {
map = message.getProperties();
value = map.get("PRRefID");
Reader reader = message.getBody(Reader)
def FG = new XmlParser().parse(reader)
if(value == null) {
FG.'urn:ExternalReqForApprovalInput_Item'.'urn:item'.'urn:HeaderExtrinsics'.Operation = "NEW"
} else {
FG.'urn:ExternalReqForApprovalInput_Item'.'urn:item'.'urn:HeaderExtrinsics'.Operation = "UPDATE"
}
message.setBody(FG);
return message;
}
What i want to achieve is validate if Extrinsic with name PRRefID comes in the xml, if it comes i need to update the Operation to UPDATE, if it doesnt come i need to set NEW as the value.
I tried to map the xpath as a Property (probably there is a cleaner way to map this from the direct xpath), but my issue right now is changing the value, since its a extrinsic with a specific name, apparently that is nor the right format for the assignation, so which should it be?
Thank you.

Answer 1

Just needs some syntax tweaks,
FG.'urn:ExternalReqForApprovalInput_Item'.'urn:item'.'urn:HeaderExtrinsics'.Extrinsics.Extrinsic[0].value = "NEW"
You have to specify the namespace wherever necessary
Note that when you parse, FG becomes root of the document so don't specify urn:ExternalReqForApprovalImportRequest again
I assumed you are trying to update the text node value
Note also that Extrinsic will be an array of nodes, so you have to refer to it by index

Answer 2

I finally solved it following your recommendation in the namespace!
import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;
import java.lang.String;
import groovy.util.XmlSlurper
import groovy.xml.XmlUtil
def Message processData(Message message) {
map = message.getProperties();
value = map.get("PRRefID");
Reader reader = message.getBody(Reader)
def root = new XmlParser().parse(reader)
if(value == "") {
root.'urn:ExternalReqForApprovalInput_Item'.'urn:item'.'urn:Operation'[0].value = "NEW"
}
message.setBody(XmlUtil.serialize(root))
return message;
}
Thank you.