/* * Copyright 2018 Google LLC * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * https://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.google.android.gnd.ui.observationdetails; import android.view.View; import androidx.lifecycle.LiveData; import androidx.lifecycle.LiveDataReactiveStreams; import com.google.android.gnd.model.feature.Feature; import com.google.android.gnd.model.observation.Observation; import com.google.android.gnd.repository.ObservationRepository; import com.google.android.gnd.rx.Loadable; import com.google.android.gnd.ui.common.AbstractViewModel; import io.reactivex.Flowable; import io.reactivex.processors.BehaviorProcessor; import javax.inject.Inject; public class ObservationDetailsViewModel extends AbstractViewModel { private final BehaviorProcessor<ObservationDetailsFragmentArgs> argsProcessor; public final LiveData<Loadable<Observation>> observations; public final LiveData<Integer> progressBarVisibility; public final LiveData<Feature> feature; @Inject ObservationDetailsViewModel(ObservationRepository observationRepository) { this.argsProcessor = BehaviorProcessor.create(); Flowable<Loadable<Observation>> observationStream = argsProcessor.switchMapSingle( args -> observationRepository .getObservation( args.getProjectId(), args.getFeatureId(), args.getObservationId()) .map(Loadable::loaded) .onErrorReturn(Loadable::error)); // TODO: Refactor to expose the fetched observation directly. this.observations = LiveDataReactiveStreams.fromPublisher(observationStream); this.progressBarVisibility = LiveDataReactiveStreams.fromPublisher( observationStream.map(ObservationDetailsViewModel::getProgressBarVisibility)); this.feature = LiveDataReactiveStreams.fromPublisher( observationStream.map(ObservationDetailsViewModel::getFeature)); } public void loadObservationDetails(ObservationDetailsFragmentArgs args) { this.argsProcessor.onNext(args); } private static Integer getProgressBarVisibility(Loadable<Observation> observation) { return observation.value().isPresent() ? View.VISIBLE : View.GONE; } private static Feature getFeature(Loadable<Observation> observation) { return observation.value().map(Observation::getFeature).get(); } }