Android/app/src/main/java/com/moiseum/wolnelektury/view/news/NewsListPresenter.java

   1 package com.moiseum.wolnelektury.view.news;
   2
   3 import android.os.Bundle;
   4
   5 import com.moiseum.wolnelektury.base.DataObserver;
   6 import com.moiseum.wolnelektury.base.DataProvider;
   7 import com.moiseum.wolnelektury.base.mvp.FragmentPresenter;
   8 import com.moiseum.wolnelektury.connection.RestClient;
   9 import com.moiseum.wolnelektury.connection.models.NewsModel;
  10 import com.moiseum.wolnelektury.connection.services.NewsService;
  11
  12 import java.util.Collections;
  13 import java.util.List;
  14
  15 import retrofit2.Call;
  16
  17 /**
  18  * Created by Piotr Ostrowski on 06.08.2018.
  19  */
  20 class NewsListPresenter extends FragmentPresenter<NewsListView> {
  21
  22         private class NewsListDataProvider extends DataProvider<List<NewsModel>, NewsService> {
  23
  24                 @Override
  25                 protected Class<NewsService> getServiceClass() {
  26                         return NewsService.class;
  27                 }
  28
  29                 @Override
  30                 public Call<List<NewsModel>> execute(NewsService service) {
  31                         return service.getNews(lastKeySlug, RestClient.PAGINATION_LIMIT);
  32                 }
  33         }
  34
  35         private class NewsListDataObserver implements DataObserver<List<NewsModel>> {
  36
  37                 @Override
  38                 public void onLoadStarted() {
  39                         getView().setProgressVisible(true);
  40                 }
  41
  42                 @Override
  43                 public void onLoadSuccess(List<NewsModel> data) {
  44                         if (data.size() > 0) {
  45                                 lastKey = data.get(data.size() - 1).getKey();
  46                         }
  47                         getView().setProgressVisible(false);
  48                         getView().setData(data);
  49                 }
  50
  51                 @Override
  52                 public void onLoadFailed(Exception e) {
  53                         getView().setProgressVisible(false);
  54                         getView().setData(Collections.emptyList());
  55                         getView().showError(e);
  56                 }
  57         }
  58
  59         private NewsListDataProvider dataProvider;
  60         private String lastKey = null;
  61
  62         NewsListPresenter(NewsListView view) {
  63                 super(view);
  64                 dataProvider = new NewsListDataProvider();
  65                 dataProvider.setDataObserver(new NewsListDataObserver());
  66         }
  67
  68         @Override
  69         public void onViewCreated(Bundle savedInstanceState) {
  70                 super.onViewCreated(savedInstanceState);
  71                 dataProvider.load(null);
  72         }
  73
  74         public void loadMoreNews() {
  75                 dataProvider.load(lastKey);
  76         }
  77
  78         public void onNewsClicked(NewsModel newsModel) {
  79                 getView().launchNews(newsModel);
  80         }
  81 }