ListPresenterImp.java

package com.joker.rxweather.presenter;

import android.content.Context;
import android.location.LocationManager;
import android.support.annotation.NonNull;
import android.util.SparseArray;
import com.fernandocejas.frodo.annotation.RxLogSubscriber;
import com.joker.rxweather.common.Constants;
import com.joker.rxweather.exception.ErrorHanding;
import com.joker.rxweather.model.entities.AddressEntity;
import com.joker.rxweather.model.entities.MainEntity;
import com.joker.rxweather.model.entities.RequestCitiesEntity;
import com.joker.rxweather.model.request.ListRequest;
import com.joker.rxweather.model.request.PrepareRequest;
import com.joker.rxweather.views.ListView;
import com.rxweather.domain.usercase.ListUseCase;
import com.rxweather.domain.usercase.PrepareCase;
import com.rxweather.domain.usercase.UseCase;
import java.util.List;
import rx.Observable;
import rx.Subscriber;

/**
 * Created by Joker on 2015/10/29.
 */
public class ListPresenterImp implements ListPresenter<ListView<Observable<List<MainEntity>>>> {

  private static final String TAG = ListPresenterImp.class.getSimpleName();

  private ListView<Observable<List<MainEntity>>> listView;

  private UseCase<SparseArray, PrepareRequest> prepareCase;
  private UseCase<List<MainEntity>, ListRequest> listUseCase;

  private PrepareRequest prepareRequest;

  public ListPresenterImp() {
  }

  @Override public void attachView(@NonNull ListView<Observable<List<MainEntity>>> view) {
    this.listView = view;

    this.prepareRequest = new PrepareRequest(
        (LocationManager) this.listView.getContext().getSystemService(Context.LOCATION_SERVICE),
        this.listView.getContext().getAssets());

    this.prepareCase = new PrepareCase();
    this.listUseCase = new ListUseCase();
  }

  @Override public void loadData() {
    ListPresenterImp.this.showLoading();
    this.prepareCase.subscribe(new PrepareSubscriber(), prepareRequest);
  }

  private void showLoading() {
    if (!listView.isContent()) {
      this.listView.showLoading();
    }
  }

  private void showContent(List<MainEntity> mainEntities) {
     /*这和.publish().replay()有些不同，如果考虑GC pressure，还是换一种实现比较好:)
    https://raw.githubusercontent.com/wiki/ReactiveX/RxJava/images/rx-operators/cache.png*/
    this.listView.showForecasts(Observable.just(mainEntities).cache());
  }

  private void showError(int messageId) {
    this.listView.showError(messageId);
  }

  /*准备工作Subscriber，位置，城市列表等*/
  @RxLogSubscriber private final class PrepareSubscriber extends Subscriber<SparseArray> {

    private ListRequest listRequest;

    @Override public void onCompleted() {
      ListPresenterImp.this.listUseCase.subscribe(new ListSubscriber(), listRequest);
    }

    @Override public void onError(Throwable e) {
      ListPresenterImp.this.showError(ErrorHanding.propagate(e));
    }

    @Override public void onNext(SparseArray sparseArray) {
      listRequest = new ListRequest(((AddressEntity) sparseArray.get(Constants.LOCATION_TAG)),
          (List<RequestCitiesEntity.RequestCity>) sparseArray.get(Constants.FORECAST_TAG));
    }
  }

  /*城市天气预报表*/
  @RxLogSubscriber private final class ListSubscriber extends Subscriber<List<MainEntity>> {

    @Override public void onCompleted() {
      ListPresenterImp.this.listView.showContent();
    }

    @Override public void onError(Throwable e) {
      ListPresenterImp.this.showError(ErrorHanding.propagate(e));
    }

    @Override public void onNext(List<MainEntity> mainEntities) {
      ListPresenterImp.this.showContent(mainEntities);
    }
  }

  @Override public void detachView() {
    this.prepareCase.unsubscribe();
    this.listUseCase.unsubscribe();
  }
}