将多个JSONArray中的JSONObject组合为Java中的单个JSONArray

Question

Am having 3 JSONArray like below.

RegionArray :

[  
   {  
      "catalog_product_id":620,
      "region_id":"en_US"
   },
   {  
      "catalog_product_id":40078,
      "region_id":"en_US"
   },
   {  
      "catalog_product_id":1048,
      "region_id":"en_US"
   }
]

CountryArray:

[  
   {  
      "catalog_product_id":620,
      "country_id":"DE"
   },
   {  
      "catalog_product_id":40078,
      "country_id":"DE"
   }
]

CompanyArray:

[
    {  
          "company_id":706,
          "catalog_product_id":40078
       },
       {  
          "company_id":706,
          "catalog_product_id":1048
       }
    }
]

These 3 different JSONArray am combining into single JSONArray and getting results like below. This array i have made by adding all the JSONObjects into single common array. JSONArray.put(regionJSONObj);JSONArray.put(countryJSONObj);JSONArray.put(companyJSONObj);

[  

    {  
      "catalog_product_id":620,
      "region_id":"en_US"
   },
   {  
      "catalog_product_id":40078,
      "region_id":"en_US"
   },
   {  
      "catalog_product_id":1048,
      "region_id":"en_US"
   },
   {  
      "catalog_product_id":620,
      "country_id":"DE"
   },
   {  
      "catalog_product_id":40078,
      "country_id":"DE"
   },
   {  
      "company_id":706,
      "catalog_product_id":40078
   },
   {  
      "company_id":706,
      "catalog_product_id":1048
   }

]

From all the 3 source JSONArray catalog_product_id key will be same in all the 3 JSONArray., so i want to build the destination JSONArray like below format.

[
    {
         "catalog_product_id":620,
         "region_id":"en_US",
         "country_id":"DE",
    },
    {
         "catalog_product_id":40078,
         "region_id":"en_US",
         "country_id":"DE",
         "company_id":706,
    },
    {
         "catalog_product_id":1048,
         "region_id":"en_US",
         "company_id":706

    }

]

All the 3 JSONArray RegionArray , CountryArray & CompanyArray having common key catalog_product_id . so i want to match catalog_product_id with all the 3 JSONArray and get the region , country & company information and build into an single Object for that particular catalog_product_id .

Answer 1

Map<String, JArray> map = 
jArrayLis.stream().collect(Collectors.toMap(JArray::getCatalog_product_id, 
Function.identity()));