I have an app in swift where I created a class ApiRequest to handle all my calls to the API, so I don't have any logic in the UI, I just return objects which I use to populate my views.
I would like to do the same in java, but for what I understand there are no anonymous functions or closures like in swift, but only anonymous objects that implement an interface. So I'm trying to convert my swift class into a java one using these concepts, volley and possibly GSON libraries, but I'm not sure how to do that exactly, or even if it makes sense in java.
Here is my swift class:
class ApiResponse {
var success: Bool = false
var message: String = ""
var data: AnyObject!
}
//The wrapper
class queryAPI {
var hostname = APP_DELEGATE.hostname
func requestAPI(url:String, params:String, completion: (ApiResponse) -> ()) {
let session = NSURLSession.sharedSession()
let urlStr = hostname+url
var request = NSMutableURLRequest(URL: NSURL(string:urlStr )!)
request.HTTPMethod = "POST"
request.HTTPBody = params.dataUsingEncoding(NSUTF8StringEncoding)
var out = NSString(data: request.HTTPBody!, encoding: NSUTF8StringEncoding)
request.addValue("XMLHTTPRequest", forHTTPHeaderField: "X-Requested-With")
request.addValue("KaliMessenger", forHTTPHeaderField: "User-Agent")
var task = session.dataTaskWithRequest(request){
(data, response, error) -> Void in
var res = ApiResponse();
if error != nil {
res.success = false
res.message = error.localizedDescription
res.data = nil;
println(error.localizedDescription)
}
else {
var error: NSError?
println("Performing request: "+urlStr)
if let jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &error) as? NSDictionary //return a dictionnary with a list of indexes (array)
{
res.success = jsonResult["success"] as! Bool;
if(res.success)
{
res.message = "";
res.data = jsonResult["data"]
}
else
{
res.message = jsonResult["msg"] as! String;
res.data = nil
}
} else {
//when we do not manage to get the result, we display the url called, what we have received, and set the response to false
var dataContent = NSString(data: data, encoding: NSASCIIStringEncoding);
println("Error decoding JSON: ")
println(dataContent)
res.message = "error decoding json response"
res.data = nil
res.success = false
}
}
//we return our items to the main thread
let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
dispatch_async(dispatch_get_global_queue(priority, 0)){
dispatch_async(dispatch_get_main_queue()){
completion(res)
}
}
}
task.resume()
}
//an example of a function using the wrapper
func conversationList(completion: ([ModelConversation]) -> ()) {
self.requestAPI("owapi/messenger/conversationList", params: "") { (res: ApiResponse) -> () in
var items = [ModelConversation]() //TODO error checking
if(res.success)
{
var data = res.data as! NSArray
for item in data{
let item = ModelConversation(data: item as! NSDictionary)
items.append(item)
}
}
completion(items)
}
}
}
Then I call the function in the controller like this:
query.allUsers(String(self.first), completion: { (users:[ModelUser]) -> () in
self.users = users
self.collectionView.reloadData()
})
And what I have so far in java:
public class QueryAPI {
public class ApiResult
{
public Boolean success;
public String message;
public Object data;
}
public interface ApiResponse<ApiResult>
{
public void onCompletion(ApiResult result);
}
public void requestApi( String url, final ApiResponse<ModelConversation> completion )
{
JsonObjectRequest apiRequest = new JsonObjectRequest(Request.Method.GET, url, (JSONObject) null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response)
{
Log.v("Data: ", response.toString());
try {
Boolean success = response.getBoolean("success");
Log.v("Success: ", success.toString());
JSONArray data = response.getJSONArray("data");
Log.v("DataArray: ", data.toString());
ApiResult res = new ApiResult();
res.success = success;
res.data = data;
completion.onCompletion(res);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}
);
}
}
Any advice, links, tips or code would be awesome!
