Toggle between feature request modes

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/*
 * Copyright 2021 Esri.
 *
 * 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
 *
 * http://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.esri.samples.toggle_between_feature_request_modes;

import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Paint;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.FeatureQueryResult;
import com.esri.arcgisruntime.data.QueryParameters;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.DrawStatus;
import com.esri.arcgisruntime.mapping.view.MapView;

public class ToggleBetweenFeatureRequestModesSample extends Application {

  private Button populateButton;
  private FeatureLayer featureLayer; // keep loadable in scope to avoid garbage collection
  private Label label;
  private MapView mapView;
  private ProgressIndicator progressIndicator;
  private RadioButton cacheButton;
  private RadioButton noCacheButton;
  private RadioButton manualCacheButton;
  private ServiceFeatureTable featureTable;
  private ToggleGroup toggleGroup;
  private VBox controlsVBox;

  private static final String SERVICE_FEATURE_URL =
      "https://services2.arcgis.com/ZQgQTuoyBrtmoGdP/arcgis/rest/services/Trees_of_Portland/FeatureServer/0";

  @Override
  public void start(Stage stage) {

    try {
      // create stack pane and application scene
      StackPane stackPane = new StackPane();
      Scene scene = new Scene(stackPane);
      scene.getStylesheets().add(getClass().getResource("/toggle_between_feature_request_modes/style.css").toExternalForm());

      // set title, size, and add scene to stage
      stage.setTitle("Toggle Between Feature Request Modes Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(scene);
      stage.show();

      // authentication with an API key or named user is required to access basemaps and other location services
      String yourAPIKey = System.getProperty("apiKey");
      ArcGISRuntimeEnvironment.setApiKey(yourAPIKey);

      // create a map with the topographic basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);

      // create service feature table from a url
      featureTable = new ServiceFeatureTable(SERVICE_FEATURE_URL);
      // create a feature layer from the service feature table
      featureLayer = new FeatureLayer(featureTable);
      // set up the control panel for switching between request modes
      setUpUi();

      // listen for when a radio button within the toggle group is selected
      toggleGroup.selectedToggleProperty().addListener(e -> {

        // check if the feature layer has already been added to the map's operational layers, and if not, add it
        if (map.getOperationalLayers().size() == 0){
          map.getOperationalLayers().add(featureLayer);
        }

        // check the feature layer has loaded before setting the request mode of the feature table, selected from
        // the radio button's user data
        featureLayer.addDoneLoadingListener(() -> {
          if (featureLayer.getLoadStatus() == LoadStatus.LOADED) {
            // enable populate button if the manual cache radio button is selected
            populateButton.setDisable(!manualCacheButton.isSelected());
            // if the manual radio button isn't selected, display a blank label, otherwise display instruction to user
            if (!manualCacheButton.isSelected()) {
              label.setText("");
            } else {
              label.setText("Click populate to view results");
            }
            // set request mode of service feature table to selected toggle option
            featureTable.setFeatureRequestMode((ServiceFeatureTable.FeatureRequestMode)
              toggleGroup.getSelectedToggle().getUserData());

          } else {
            new Alert(Alert.AlertType.ERROR, "Feature Layer Failed to Load!").show();
          }
        });
      });

      // fetch cache manually when the populate button is clicked
      populateButton.setOnAction(e -> fetchCacheManually());

      // create a map view and set the map to it
      mapView = new MapView();
      mapView.setMap(map);
      // set the starting viewpoint for the map view
      mapView.setViewpoint(new Viewpoint(45.5266, -122.6219, 6000));
      // disable the vbox and show a progress indicator when the map view is drawing (e.g. when fetching caches)
      controlsVBox.disableProperty().bind(mapView.drawStatusProperty().isEqualTo(DrawStatus.IN_PROGRESS));
      progressIndicator.visibleProperty().bind(mapView.drawStatusProperty().isEqualTo(DrawStatus.IN_PROGRESS));

      // add label and button to the control panel
      controlsVBox.getChildren().addAll(cacheButton, noCacheButton, manualCacheButton, label, populateButton);

      // add the map view and control panel to stack pane
      stackPane.getChildren().addAll(mapView, controlsVBox, progressIndicator);
      StackPane.setAlignment(controlsVBox, Pos.TOP_LEFT);
      StackPane.setMargin(controlsVBox, new Insets(10, 0, 0, 10));
    } catch (Exception e) {
      // on any error, display the stack trace
      e.printStackTrace();
    }
  }

  /**
   * Fetches the cache from a Service Feature Table manually.
   */
  private void fetchCacheManually() {

    // create query to select all tree features
    QueryParameters queryParams = new QueryParameters();
    // query for all tree conditions except "dead" with coded value '4' within the visible extent
    queryParams.setWhereClause("Condition < '4'");
    queryParams.setGeometry(mapView.getVisibleArea().getExtent());

    List<String> outfields = Collections.singletonList("*");     // * means all features
    // get queried features from service feature table and clear previous cache
    ListenableFuture<FeatureQueryResult> tableResult = featureTable.populateFromServiceAsync(queryParams, true, outfields);

    tableResult.addDoneListener(() -> {
      try {
        // find the number of features returned from query
        AtomicInteger featuresReturned = new AtomicInteger();
        tableResult.get().forEach(feature -> featuresReturned.getAndIncrement());

        // display number of returned features to the user
        // note the service has a maximum record count of 2000
        label.setText("Populated " + featuresReturned + " features.");
      } catch (Exception e) {
        // on any error, display the stack trace
        e.printStackTrace();
      }
    });
  }

  /**
   * Sets up a control panel with radio buttons to toggle between feature request modes, a label displaying the features
   * returned from a manual cache result, and a button to manually request cache if manual cache feature request mode
   * is selected.
   */
  private void setUpUi() {

    // create a control panel
    controlsVBox = new VBox(6);
    controlsVBox.setBackground(new Background(new BackgroundFill(Paint.valueOf("rgba(0,0,0,0.5)"), CornerRadii.EMPTY,
      Insets.EMPTY)));
    controlsVBox.setPadding(new Insets(10.0));
    controlsVBox.setMaxSize(200, 80);
    controlsVBox.getStyleClass().add("panel-region");

    // create a label to display information on the UI
    label = new Label("Choose a feature request mode.");

    // set the feature request mode as the user data on the equivalent radio button
    cacheButton = new RadioButton("Cache");
    cacheButton.setUserData(ServiceFeatureTable.FeatureRequestMode.ON_INTERACTION_CACHE);
    noCacheButton = new RadioButton("No cache");
    noCacheButton.setUserData(ServiceFeatureTable.FeatureRequestMode.ON_INTERACTION_NO_CACHE);
    manualCacheButton = new RadioButton("Manual cache");
    manualCacheButton.setUserData(ServiceFeatureTable.FeatureRequestMode.MANUAL_CACHE);

    // create a new toggle group and add the radio buttons to it
    toggleGroup = new ToggleGroup();
    toggleGroup.getToggles().addAll(cacheButton, noCacheButton, manualCacheButton);

    // create button to request the service table's cache
    populateButton = new Button("Populate");
    populateButton.setMaxWidth(Double.MAX_VALUE);
    populateButton.setDisable(true);

    // create a progress indicator
    progressIndicator = new ProgressIndicator();
    progressIndicator.setVisible(false);
  }

  /**
   * Stops and releases all resources used in application.
   */
  @Override
  public void stop() {

    if (mapView != null) {
      mapView.dispose();
    }
  }

  /**
   * Opens and runs application.
   *
   * @param args arguments passed to this application
   */
  public static void main(String[] args) {

    Application.launch(args);
  }

}