Preparing JSON array of Objects from multiple array list - json

Question

I am very new to the Groovy scripts and would like to build a JSON output from the below JSON input. Kindly help!
My JSON input looks like this:
{
"id":"1222",
"storageNode": {
"uuid": "22255566336",
"properties": {
"BuinessUnit": [
"Light",
"Fan",
"Watch"
],
"Contact": [
"abc#gmail.com",
"fhh#gmail.com"
],
"Location": [
"Banglore",
"Surat",
"Pune"
]
}
}
}
Expected Output:
[
{
"BuinessUnit": "Light",
"Contact": "abc#gmail.com",
"Location": "Banglore"
},
{
"BuinessUnit": "Fan",
"Contact": "fhh#gmail.com",
"Location": "Surat"
},
{
"BuinessUnit": "Watch",
"Contact": "",
"Location": "Pune"
}
]
Please note that in case any array is not matching the value count that will always be the last one and in that case, a blank value ("") has to be populated. The "BusinessUnit" object can be referred for array size validation.
My code looks like this:
import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;
import groovy.json.*;
def Message processData(Message message) {
//Body
def body = message.getBody(String.class);
def jsonSlurper = new JsonSlurper()
def list = jsonSlurper.parseText(body)
String temp
def BU = list.storageNode.properties.get("BusinessUnit")
def builder = new JsonBuilder(
BU.collect {
[
BusinessUnit: it
]
}
)
message.setBody(builder.toPrettyString())
return message
}
It is only returning this:
[
{
"BusinessUnit": "Light"
},
{
"BusinessUnit": "Fan"
},
{
"BusinessUnit": "Watch"
}
]
Now how will I add other parts to it? Please help!

Answer 1

I have come up with the following solution that converts source JSON string to the target JSON string:
import groovy.json.JsonBuilder
import groovy.json.JsonSlurper
def json = '''
{
"id":"1222",
"storageNode": {
"uuid": "22255566336",
"properties": {
"BusinessUnit": [
"Light",
"Fan",
"Watch"
],
"Contact": [
"abc#gmail.com",
"fhh#gmail.com"
],
"Location": [
"Banglore",
"Surat",
"Pune"
]
}
}
}
'''
println convert(json)
String convert(String json) {
def list = new JsonSlurper().parseText(json)
List<String> units = list.storageNode.properties.BusinessUnit
List<String> contacts = list.storageNode.properties.Contact
List<String> locations = list.storageNode.properties.Location
def result = []
units.eachWithIndex { unit, int index ->
result << [
BusinessUnit: unit,
Contact : contacts.size() > index ? contacts[index] : '',
Location : locations.size() > index ? locations[index] : '',
]
}
return new JsonBuilder(result).toPrettyString()
}
I've omitted the logic of getting string from the message and packaging transformed JSON into message.
I hope it will help you to move forward. Please let me know if you need further assistance here.

Answer 2

You can use the built-in Groovy facilities, like transpose():
import groovy.json.*
def json = new JsonSlurper().parseText '''{ "id":"1222", "storageNode": { "uuid": "22255566336", "properties": {
"BuinessUnit": [ "Light", "Fan", "Watch" ],
"Contact": [ "abc#gmail.com", "fhh#gmail.com" ],
"Location": [ "Banglore", "Surat", "Pune" ] } } }'''
def names = json.storageNode.properties*.key
def values = json.storageNode.properties*.value
int maxSize = values*.size().max()
// pad lists with trainiling spaces
values.each{ v -> ( maxSize - v.size() ).times{ v << '' } }
def result = values.transpose().collect{ tuple -> [ names, tuple ].transpose().collectEntries{ it } }
assert result.toString() == '[[BuinessUnit:Light, Contact:abc#gmail.com, Location:Banglore], [BuinessUnit:Fan, Contact:fhh#gmail.com, Location:Surat], [BuinessUnit:Watch, Contact:, Location:Pune]]'
This piece of code can process everything under storageNode.properties.