Query features with Arcade expression

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/*
 * Copyright 2022 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.query_features_with_arcade_expression;

import java.util.HashMap;

import javafx.application.Application;
import javafx.geometry.Point2D;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.input.MouseButton;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.arcade.ArcadeEvaluationResult;
import com.esri.arcgisruntime.arcade.ArcadeEvaluator;
import com.esri.arcgisruntime.arcade.ArcadeExpression;
import com.esri.arcgisruntime.arcade.ArcadeProfile;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.ArcGISFeature;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.layers.Layer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.view.Callout;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.portal.Portal;
import com.esri.arcgisruntime.portal.PortalItem;

public class QueryFeaturesWithArcadeExpressionSample extends Application {

  private MapView mapView;
  private ArcGISMap map;
  private final String calloutText = "Crimes in the last 60 days: ";

  @Override
  public void start(Stage stage) {
    try {
      // create stack pane and application scene
      var stackPane = new StackPane();
      var scene = new Scene(stackPane);

      // set title, size, and add scene to stage
      stage.setTitle("Query Features With Arcade Expression 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 progress indicator
      var progressIndicator = new ProgressIndicator();

      // create a portal item and use it to create a map
      var portal = new Portal("https://www.arcgis.com/");
      var portalItem = new PortalItem(portal, "539d93de54c7422f88f69bfac2aebf7d");
      map = new ArcGISMap(portalItem);

      // create a map view and set the map to it
      mapView = new MapView();
      mapView.setMap(map);

      // set callout leader to appear at the bottom of the callout
      Callout callout = mapView.getCallout();
      callout.setLeaderPosition(Callout.LeaderPosition.BOTTOM);

      // wait for the map to finish loading data from portal before accessing its layers
      map.addDoneLoadingListener(() -> {
        if (map.getLoadStatus() == LoadStatus.LOADED) {
          Layer policeBeatsLayer = map.getOperationalLayers().get(0);
          progressIndicator.setVisible(false);

          // if map clicked, evaluate an arcade expression at that point
          mapView.setOnMouseClicked(event -> {
            if (event.getButton() == MouseButton.PRIMARY && event.isStillSincePress()) {
              // get the location of the click on the screen
              Point2D screenPoint = new Point2D(event.getX(), event.getY());

              // convert the click location from screen coordinates to map coordinates
              Point mapPoint = mapView.screenToLocation(screenPoint);

              // identify any features on the layer at the clicked location
              var identifyLayerResultFuture = mapView.identifyLayerAsync(policeBeatsLayer,
                screenPoint, 0, false);
              identifyLayerResultFuture.addDoneListener(() -> {
                if (identifyLayerResultFuture.isDone()) {
                  try {
                    var identifyLayerResult = identifyLayerResultFuture.get();

                    // only execute query if the police beats layer has data at the selected point
                    if (identifyLayerResult.getElements().size() != 0) {
                      ArcGISFeature feature = (ArcGISFeature) identifyLayerResult.getElements().get(0);

                      // show callout and text without data
                      callout.setTitle(calloutText);
                      callout.setDetail("...");
                      callout.showCalloutAt(mapPoint);
                      callout.setVisible(true);

                      // setup arcade expression and evaluator
                      String arcadeExpressionString = "var crimes = FeatureSetByName($map, 'Crime in the last 60 days');\n" +
                        "return Count(Intersects($feature, crimes));";
                      var arcadeExpression = new ArcadeExpression(arcadeExpressionString);
                      var arcadeEvaluator = new ArcadeEvaluator(arcadeExpression, ArcadeProfile.FORM_CALCULATION);

                      // instantiate key/value pairs
                      var hashMap = new HashMap<String, Object>();
                      hashMap.put("$feature", feature);
                      hashMap.put("$map", mapView.getMap());

                      // evaluate the arcade expression asynchronously
                      ListenableFuture<ArcadeEvaluationResult> resultFuture = arcadeEvaluator.evaluateAsync(hashMap);

                      // wait for the expression to finish evaluating before attempting to access it
                      resultFuture.addDoneListener(() -> {
                        if (resultFuture.isDone()) {
                          try {
                            // get result from async method and round
                            var arcadeEvaluationResult = resultFuture.get();
                            var crimesCount = Math.round((double) arcadeEvaluationResult.getResult());

                            // add data from arcade evaluation to callout
                            callout.setDetail(String.valueOf(crimesCount));
                          } catch (Exception e) {
                            throw new RuntimeException(e);
                          }
                        }
                      });

                    } else {
                      // if no data is found at the selected point, hide the callout
                      callout.setVisible(false);
                    }

                  } catch (Exception e) {
                    throw new RuntimeException(e);
                  }
                }
              });
            }
          });

        } else if (map.getLoadStatus() == LoadStatus.FAILED_TO_LOAD) {
          new Alert(Alert.AlertType.ERROR, "Map failed to load").show();
        }
      });

      // add the map view and progress indicator to the stack pane
      stackPane.getChildren().addAll(mapView, progressIndicator);
    } catch (Exception e) {
      // on any error, display the stack trace.
      e.printStackTrace();
    }
  }

  /**
   * 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);
  }
}