Added Android code

[wl-app.git] / Android / app / src / main / java / com / moiseum / wolnelektury / view / news / NewsListPresenter.java

diff --git a/Android/app/src/main/java/com/moiseum/wolnelektury/view/news/NewsListPresenter.java b/Android/app/src/main/java/com/moiseum/wolnelektury/view/news/NewsListPresenter.java
new file mode 100644 (file)
index 0000000..4b87b96
--- /dev/null
+++ b/Android/app/src/main/java/com/moiseum/wolnelektury/view/news/NewsListPresenter.java
@@ -0,0 +1,81 @@
+package com.moiseum.wolnelektury.view.news;
+
+import android.os.Bundle;
+
+import com.moiseum.wolnelektury.base.DataObserver;
+import com.moiseum.wolnelektury.base.DataProvider;
+import com.moiseum.wolnelektury.base.mvp.FragmentPresenter;
+import com.moiseum.wolnelektury.connection.RestClient;
+import com.moiseum.wolnelektury.connection.models.NewsModel;
+import com.moiseum.wolnelektury.connection.services.NewsService;
+
+import java.util.Collections;
+import java.util.List;
+
+import retrofit2.Call;
+
+/**
+ * Created by Piotr Ostrowski on 06.08.2018.
+ */
+class NewsListPresenter extends FragmentPresenter<NewsListView> {
+
+       private class NewsListDataProvider extends DataProvider<List<NewsModel>, NewsService> {
+
+               @Override
+               protected Class<NewsService> getServiceClass() {
+                       return NewsService.class;
+               }
+
+               @Override
+               public Call<List<NewsModel>> execute(NewsService service) {
+                       return service.getNews(lastKeySlug, RestClient.PAGINATION_LIMIT);
+               }
+       }
+
+       private class NewsListDataObserver implements DataObserver<List<NewsModel>> {
+
+               @Override
+               public void onLoadStarted() {
+                       getView().setProgressVisible(true);
+               }
+
+               @Override
+               public void onLoadSuccess(List<NewsModel> data) {
+                       if (data.size() > 0) {
+                               lastKey = data.get(data.size() - 1).getKey();
+                       }
+                       getView().setProgressVisible(false);
+                       getView().setData(data);
+               }
+
+               @Override
+               public void onLoadFailed(Exception e) {
+                       getView().setProgressVisible(false);
+                       getView().setData(Collections.emptyList());
+                       getView().showError(e);
+               }
+       }
+
+       private NewsListDataProvider dataProvider;
+       private String lastKey = null;
+
+       NewsListPresenter(NewsListView view) {
+               super(view);
+               dataProvider = new NewsListDataProvider();
+               dataProvider.setDataObserver(new NewsListDataObserver());
+       }
+
+       @Override
+       public void onViewCreated(Bundle savedInstanceState) {
+               super.onViewCreated(savedInstanceState);
+               dataProvider.load(null);
+       }
+
+       public void loadMoreNews() {
+               dataProvider.load(lastKey);
+       }
+
+       public void onNewsClicked(NewsModel newsModel) {
+               getView().launchNews(newsModel);
+       }
+}