Spring boot consume 2 rest and merge some fields - spring

Question

Im new to Spring Boot and got a problem were i need to consume 2 remote Rest services and merge the results. Would need some insight on the right approach.
I got something like this:
{"subInventories":[
{"OrganizationId": 0,
"OrganizationCode":"",
"SecondaryInventoryName":"",
"Description":""},...{}...],
{"organizations":[
{"OrganizationId":0,
"OrganizationCode":"",
"OrganizationName":"",
"ManagementBusinessUnitId":,
"ManagementBusinessUnitName":""}, ...{}...]}
and need to make it into something like this:
{"items":[
{"OrganizationId":0,
"OrganizationCode":"",
"OrganizationName":"",
"ManagementBusinessUnitId":0,
"ManagementBusinessUnitName":"",
"SecondaryInventoryName":"",
"Description":""},...{}...]
got 2 #Entitys to represent each item, Organizations and Inventories with the attributtes like the JSON fields.
EDIT
Currently trying to get matches with Java8 stream()
#GetMapping("/manipulate")
public List<Organization> getManipulate() {
List<Organization> organization = (List<Organization>)(Object) organizationController.getOrganization();
List<SubInventories> subInventories = (List<SubInventories>)(Object) getSuvInventories();
List<Organization> intersect = organization.stream().filter(o -> subInventories.stream().anyMatch(s -> s.getOrganizationId()==o.getOrganizationId()))
.collect(Collectors.toList());
return intersect;
}
found this searching but i got many classes and I don't know if it would be better to just for each organization get the subinventories and put them in a list of maps like
List<Map<String,Object> myList = new ArrayList<>();
//Loops here
Map<String,Object> a = new HashMap<>();
a.put("OrganizationID", 1231242415)...
myList.add(a)
Quite lost in what the right approach is.
EDIT2
Here the classes I'm using.
Organizations
#Entity
#JsonAutoDetect(fieldVisibility = Visibility.ANY)
#JsonIgnoreProperties(ignoreUnknown = true)
public class Organization implements Serializable{
//#JsonObject("OrganizationId")
#Id
private Long OrganizationId;
private Long ManagementBusinessUnitId;
private String OrganizationCode,OrganizationName,ManagementBusinessUnitName;
public Organization() {
}
//getters setters
}
SubInventories
#Entity
#JsonAutoDetect(fieldVisibility = Visibility.ANY)
#JsonIgnoreProperties(ignoreUnknown = true)
public class SubInventories implements Serializable{
#Id
private Long OrganizationId;
private String OrganizationCode,SecondaryInventoryName,Description;
public SubInventories() {
}
//getters and setters
}
Wrapper to unwrapp consume
#JsonAutoDetect(fieldVisibility = Visibility.ANY)
#JsonIgnoreProperties(ignoreUnknown = true)
public class Wrapper {
//#JsonProperty("items")
private List<Object> items;
public Wrapper() {
}
public List<Object> getOrganization() {
return items;
}
public void setOrganization(List<Object> organization) {
this.items = organization;
}
}
OrganizationController
#RestController
public class OrganizationController {
#Autowired
private RestTemplate restTemplate;
#Autowired
private Environment env;
#GetMapping("/organizations")
public List<Object> getOrganization() {
return getOrganizationInfo();
}
private List<Object> getOrganizationInfo() {
String url = env.getProperty("web.INVENTORY_ORGANIZATIONS");
UriComponentsBuilder builder = UriComponentsBuilder.fromUriString(url);
builder.queryParam("fields", "OrganizationId,OrganizationCode,OrganizationName,ManagementBusinessUnitId,ManagementBusinessUnitName");
builder.queryParam("onlyData", "true");
HttpHeaders headers = new HttpHeaders();
headers.setBasicAuth(env.getProperty("authentication.name"),env.getProperty("authentication.password"));
HttpEntity request = new HttpEntity(headers);
ResponseEntity<Wrapper> temp = restTemplate.exchange(builder.toUriString(), HttpMethod.GET, request, new ParameterizedTypeReference<Wrapper>() {});
List<Object> data = temp.getBody().getOrganization();
return data;
}
}
SubInventoryController
#RestController
public class SubInventoryController {
#Autowired
private RestTemplate restTemplate;
#Autowired
private Environment env;
#GetMapping("/sub")
public List<Object> getSuvInventories() {
UriComponentsBuilder builder = UriComponentsBuilder.fromUriString("this is private :(");
builder.queryParam("onlyData", "true");
builder.queryParam("expand", "subinventoriesDFF");
builder.queryParam("limit", "999999");
builder.queryParam("fields", "OrganizationId,OrganizationCode,SecondaryInventoryName,Description");
HttpHeaders headers = new HttpHeaders();
headers.setBasicAuth(env.getProperty("authentication.name"),env.getProperty("authentication.password"));
headers.set("REST-Framework-Version", "2");
HttpEntity request = new HttpEntity(headers);
ResponseEntity<Wrapper> subInventories = restTemplate.exchange(builder.toUriString(), HttpMethod.GET, request, new ParameterizedTypeReference<Wrapper>() {});
List<Object> data = subInventories.getBody().getOrganization();
return data;
}
}
where I'm right now
#RestController
public class MainController {
#Autowired
private RestTemplate restTemplate;
#Autowired
private Environment env;
#Autowired
private OrganizationController organizationController;
#Autowired
private SubInventoryController subInventoryController;
#GetMapping("/manipulate")
public Map<Organization, List<SubInventories>> getManipulate() {
List<Organization> organizations = (List<Organization>)(Object) organizationController.getOrganization();
List<SubInventories> subInventories = (List<SubInventories>)(Object) subInventoryController.getSuvInventories();
Map<Organization,List<SubInventories>> result = new HashMap<Organization,List<SubInventories>>();
for(Organization organization : organizations) {
List<SubInventories> subInventoryMatched = (List<SubInventories>) subInventories.stream().filter( s -> s.getOrganizationId()== organization.getOrganizationId()).collect(Collectors.toList());
result.put(organizations.get(0), subInventoryMatched);
}
return result;
}
}
From what I understand I need to make a wrapper class for each POJO cause the response looks like this
/organizations
{
"items": [
{
"OrganizationId": 1,
"OrganizationCode": "adasd",
"OrganizationName": "Hotel Bahía Príncipe Sunlight Costa Adeje",
"ManagementBusinessUnitId": 131231,
"ManagementBusinessUnitName": "asdasfdas"
},
{
"OrganizationId": 2,
"OrganizationCode": "adadas",
"OrganizationName": "Hadasd",
"ManagementBusinessUnitId": 1231,
"ManagementBusinessUnitName": "aewfrqaew"
}]}
and /subInventories
{
"items": [
{
"OrganizationId": 1,
"OrganizationCode": "asada",
"SecondaryInventoryName": "adfasdfasdgf",
"Description": "pub"
},
{
"OrganizationId": 2,
"OrganizationCode": "asgfrgtsdh",
"SecondaryInventoryName": "B LOB",
"Description": "pub2"
}
]}
If used the generic one with Object I get a java.lang.ClassCastException: java.util.LinkedHashMap incompatible with com.demo.model.Organization in the stream().filter and for the merge of the fields another class to get the desired
{
"items": [
{
"OrganizationId": 1,
"OrganizationCode": "asdas",
"OrganizationName": "adsadasd",
"ManagementBusinessUnitId": 1,
"ManagementBusinessUnitName": "asdasdf",
"SecondaryInventoryName": "sfsdfsfa",
"Description": "pub1"
}]}
Tons of classes if i get lots of POJO

Answer 1

I assume the following from the information you provide:
You have two Datatypes (Java classes). They should be merged together to one Java class
You have to load this data from different sources
Non of the classes are leading
I can provide you some example code. The code is based on the previos adoptions. This will give you an idea. It's not a simple copy and paste solution.
At first create a class with all fields you want to include in the result:
public class Matched {
private Object fieldA;
private Object fieldB;
// Some getter and Setter
}
The Basic idea is that you load your data. Than find the two corresponding objects. After that do your matching for each field.
public List<Matched> matchYourData() {
// load your data
List<DataA> dataAList = loadYourDataA();
List<DataB> dataBList = loadYourDataB();
List<Matched> resultList = new ArryList<>();
for (dataA: DataA) {
DataB dataB = dataBList.stream()
.filter(data -> data.getId() == dataA.getId())
.findFirst().orElseThrow();
// Now you have your data. Let's match them.
Matched matched = new Matched();
matched.setFieldA(dataB.getFieldA() == dataA.getFieldA() ? doSomething() : doSomethingElse());
// Set all your fields. Decide for everyone the matching strategy
resultList.add(matched);
}
return resultList;
}
This is a quite simple solution. Of course you can use Tools like Mapstruct for mapping purpose. But this depends on your environment.