Parsing JSON data values present at any level in GROOVY

Whenever we deal with JSON we need to parse it at a specific level. What if I don't have a location to parse to parse specific value, how we will do that?.

e. g if have below JSON and we want to parse it to get values of analytics Id

{
   
   "buildInfo":    {
      "application": "RepCatalog",
      "version": "1.0.0",
      "buildDate": "Thu Oct 13 17:01:48 IST 2016"
   },
   "status": "success",
   "data": {"analytics": [   {      "status": "success",
      "catalogRep":       {
         "analyticsId": 48961,
         "ReportType": "REPORT",
         "title": "REPORT1476371357505",
         "rights": [         {
            "availability": "PUBLIC",
            "isDefault": true
         }],
         "initialCreation": "10/13/2016 20:39:11",
         "lastModified": "10/13/2016 20:39:11",
         "lastAccessed": "10/13/2016 20:39:11",
         "status": "OPEN"
               },
      "cascadeCount": 0
   }]},
   "time": 6674
}

I struggle alot the and find the working solution around it  

I have written following function to get all  values of analyticId

def extractRepIds (def tree, def ids = []) {
    switch (tree) {
        case Map:
            tree.each { k, v ->
                if (k == "AnalyticsId") { ids << v }
                extractRepIds(v, ids)
            }
            return ids
        case Collection:
            tree.each { e -> extractRepIds(e, ids) }
            return ids
        default :
            return ids
    }
}

Now I have to call that function for values 

def extractRepIdsFromJson(def jsonString) {
    def tree = new JsonSlurper().parseText(jsonString)
    extractRepIds(tree)
}