JsonArray and Gson - json

Question

The JSON library I'm using is Gson. I'm having difficulty formulating a functioning data type to represent the following JSON string:
{
"latestoffers": [
{
"id": "4qXleunwNMCKi8M0q0CuMa",
"price": "534.99",
"firstrecorded_at": 1377808800,
"lastrecorded_at": 1382862800,
"seller": "Newegg",
"availability": "In stock. [BBX: Buy Box]",
"currency": "USD"
},
{
"id": "4xTIQAPySG68IS0CGyOuyO",
"price": "582.41",
"firstrecorded_at": 1380725000,
"lastrecorded_at": 1382862800,
"seller": "Beach Audio",
"currency": "USD"
},
{
"id": "5nW67R2V4CwmE8cwaWsawe",
"price": "578.04",
"firstrecorded_at": 1379524200,
"lastrecorded_at": 1379998900,
"seller": "Beach Audio",
"currency": "USD"
}
],
"offers_count": 6,
"name": "newegg.com",
"recentoffers_count": 2,
"sku": "N82E16834216463",
"url": "http://www.newegg.com/Product/Product.aspx?Item=N82E16834216463"
}
My data class (so far) is as follows, it's the method getOfferData() that I don't how to complete. I'm also not certain whether JsonArray is the appropriate JSON element to be using?
static class LatestOffers {
Integer offers_count;
String name;
Integer recentoffers_count;
String sku;
String url;
java.util.List<JsonArray> getOfferData() {
List<JsonArray> list = new ArrayList<JsonArray>();
// how do I get parse the 'id', 'price', 'firstrecorded_at' etc. to add them to the ArrayList?
return list;
}
Integer getOffers_count() {
return offers_count;
}
String getName() {
return name;
}
Integer getRecentoffers_count() {
return recentoffers_count;
}
String getSku() {
return sku;
}
String getUrl() {
return url;
}
}
Any assistance, please? Thank you.
EDIT
Turns out I was unnecessarily complicating things, this works as intended:
static class LatestOffers {
List<Offer> latestoffers;
List<Offer> getOffer() {
return latestoffers;
}
}
static class Offer {
private String id;
private String price;
private long firstrecorded_at;
private long lastrecorded_at;
private String seller;
private String availability;
private String currency;
String getId() {
return id;
}
String getPrice() {
return price;
}
long getFirstrecorded_at() {
return firstrecorded_at;
}
long getLastrecorded_at() {
return lastrecorded_at;
}
String getSeller() {
return seller;
}
String getAvailability() {
return availability;
}
String getCurrency() {
return currency;
}
}
Thank you to all who answered, I'm accepting the answer of user2762451 as (s)he was the first to suggest the use of another class for the Offer data.

Answer 1

I'd advise you to make new POJO for object in array.
class Offer {
private String id;
private String price;
private long firstRecordedAt;
private long lastRecordedAt;
private String seller;
private String availability;
private String currency;
}
And your LatestOffers class can have a List<Offer> offers; and the method getOfferData() should return List<Offer>.
Basically, the following:
static class LatestOfferDetail {
private int offersCount;
private String name;
private int recentOffersCount;
private String sku;
private String url;
private List<Offer> latestOffers = new ArrayList<Offer>();
//other getters and setters
public List<Offer> getLatestOffers() {
return latestOffers;
}
}
Also, you seem to be following multiple naming conventions in the same piece of code and JSON. With JAVA, it's advisable to follow CamelCaseNaming. I've updated answer to reflect those.
Also, your getter method for latestOffers has a name different from convention. It's advisable to name it like get{FieldName}. I've updated answer to reflect that.

Answer 2

Create another POJO contain all parameter use in array like below :
public class MyOffer
{
private String id;
private double price;
private long firstrecorded_at;
private long lastrecorded_at;
private String seller;
private String availability;
private String currency;
//your getter and setter methods here.
}
Include List of above pojo in your class LatestOffers :
List<MyOffer> latestoffers = new ArrayList<MyOffer>();
your class LatestOffers look like this
static class LatestOffers
{
Integer offers_count;
String name;
Integer recentoffers_count;
String sku;
String url;
List<MyOffer> latestoffers = new ArrayList<MyOffer>();
//getter and setter method
}
Main Class for Test:
public static void main(String[] args) {
LatestOffers lso = new LatestOffers();
lso.setName("N82E16834216463");
lso.setOffers_count(6);
lso.setRecentoffers_count(2);
lso.setSku("N82E16834216463");
lso.setUrl("http://www.newegg.com/Product/Product.aspx?Item=N82E16834216463");
MyOffer offer = null;
List<MyOffer> list = new ArrayList<MyOffer>();
for(int i=0;i<2;i++){
offer = new MyOffer();
offer.setAvailability("In stock. [BBX: Buy Box]");
offer.setCurrency("USD");
offer.setFirstrecorded_at(1377808800);
offer.setId("4qXleunwNMCKi8M0q0CuMa");
offer.setLastrecorded_at(1382862800);
offer.setPrice(534.99);
offer.setSeller("Newegg");
list.add(offer);
}
lso.setLatestoffers(list);
Gson gson = new Gson();
String json = gson.toJson(lso);
System.out.println(json);
}
Output :
{
"offers_count": 6,
"name": "N82E16834216463",
"recentoffers_count": 2,
"sku": "N82E16834216463",
"url": "http://www.newegg.com/Product/Product.aspx?Item=N82E16834216463",
"latestoffers": [
{
"id": "4qXleunwNMCKi8M0q0CuMa",
"price": 534.99,
"firstrecorded_at": 1377808800,
"lastrecorded_at": 1382862800,
"seller": "Newegg",
"availability": "In stock. [BBX: Buy Box]",
"currency": "USD"
},
{
"id": "4qXleunwNMCKi8M0q0CuMa",
"price": 534.99,
"firstrecorded_at": 1377808800,
"lastrecorded_at": 1382862800,
"seller": "Newegg",
"availability": "In stock. [BBX: Buy Box]",
"currency": "USD"
}
]
}
no need to define getOfferData() method just create list of MyOffer class and set that list into latestoffers list define in your class LatestOffers. It will serialize your list into JsonArray when you convert your POJO into JSON String.