Filter by definition expression or display filter

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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.filter_by_definition_expression_or_display_filter;

import java.util.Collections;
import java.util.concurrent.ExecutionException;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.HBox;
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.data.QueryParameters;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.layers.DisplayFilter;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.layers.ManualDisplayFilterDefinition;
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 FilterByDefinitionExpressionOrDisplayFilterSample extends Application {

  private Button applyExpressionButton;
  private Button applyFilterButton;
  private Button resetButton;
  private Label featureCountLabel;

  private MapView mapView;
  private FeatureLayer featureLayer; // keep loadable in scope to avoid garbage collection

  private static final String FEATURE_SERVICE_URL =
    "https://services2.arcgis.com/ZQgQTuoyBrtmoGdP/arcgis/rest/services/SF_311_Incidents/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("/filter_by_definition_expression_or_display_filter/style.css").toExternalForm());

      // set title, size, and add scene to stage
      stage.setTitle("Filter by Definition Expression or Display Filter 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 a map view and set the map to it
      mapView = new MapView();
      mapView.setMap(map);
      // disable interaction with the map view to avoid navigating away from the data
      mapView.setDisable(true);

      // create feature layer from service feature table
      featureLayer = new FeatureLayer(new ServiceFeatureTable(FEATURE_SERVICE_URL));
      // add the feature layer to the map's operational layers
      map.getOperationalLayers().add(featureLayer);

      // starting location for sample
      Point startPoint = new Point(-122.45044007080793, 37.775915492745874, SpatialReferences.getWgs84());
      // set the viewpoint for the map view
      mapView.setViewpointCenterAsync(startPoint, 20000);

      // set up user interface and add a progress indicator
      VBox vBox = controlsVBox();
      var progressIndicator = new ProgressIndicator();
      progressIndicator.setVisible(true);

      // create a new display filter with a name and where clause
      var displayFilter = new DisplayFilter("Damaged Trees", "req_type LIKE '%Tree Maintenance%'");
      var manualDisplayFilterDefinition = new ManualDisplayFilterDefinition(displayFilter,
        Collections.singletonList(displayFilter));

      // reset any existing definition expression on the feature layer, and set a display filter definition to it
      applyFilterButton.setOnAction(e -> {
          // reset the definition expression on the feature layer
          featureLayer.setDefinitionExpression("");
          // set the display filter definition to the feature layer
          featureLayer.setDisplayFilterDefinition(manualDisplayFilterDefinition);
        }
      );

      // reset any existing display filter definition on the feature layer, and set a definition expression to it
      applyExpressionButton.setOnAction(e -> {
        // reset the display filter definition
        featureLayer.setDisplayFilterDefinition(null);
        // set the definition expression to the feature layer
        featureLayer.setDefinitionExpression("req_Type = 'Tree Maintenance or Damage'");
      });

      // reset the definition expression and display filter definition on the feature layer
      resetButton.setOnAction(e -> {
        // reset the display filter definition
        featureLayer.setDisplayFilterDefinition(null);
        // reset the definition expression on the feature layer
        featureLayer.setDefinitionExpression("");
      });

      // check that the feature layer has loaded, then add a draw status changed listener to the mapview to count
      // the features visible in the viewpoint extent every time the map is redrawn
      featureLayer.addDoneLoadingListener(() -> {
        if (featureLayer.getLoadStatus() == LoadStatus.LOADED) {
          mapView.addDrawStatusChangedListener(drawStatusChangedEvent -> {
            // if the draw status is in progress, show the progress indicator and set the count label text
            if (drawStatusChangedEvent.getDrawStatus() == DrawStatus.IN_PROGRESS) {
              progressIndicator.setVisible(true);
              featureCountLabel.setText("updating..");
            } else {
              // if draw status is complete, hide the progress indicator
              progressIndicator.setVisible(false);
              // get the map view's current view point, create query parameters and set the view point to it
              Envelope viewPointExtent =
                mapView.getCurrentViewpoint(Viewpoint.Type.BOUNDING_GEOMETRY).getTargetGeometry().getExtent();
              QueryParameters queryParameters = new QueryParameters();
              queryParameters.setGeometry(viewPointExtent);

              // update the UI with the count of features in the extent
              if (!viewPointExtent.isEmpty()) {
                var queryFeatures = featureLayer.getFeatureTable().queryFeatureCountAsync(queryParameters);
                // once the query feature count is done, update the label to show the total incidents counted
                queryFeatures.addDoneListener(() -> {
                  Long totalIncidentReported;
                  try {
                    totalIncidentReported = queryFeatures.get();
                    featureCountLabel.setText(totalIncidentReported.toString());
                  } catch (InterruptedException | ExecutionException e) {
                    e.printStackTrace();
                  }
                });
              }
            }
          });
        } else {
          new Alert(Alert.AlertType.ERROR, "Feature layer failed to load").show();
        }
      });

      // add the map view and control panel to stack pane
      stackPane.getChildren().addAll(mapView, vBox, progressIndicator);
      StackPane.setAlignment(vBox, Pos.TOP_LEFT);
      StackPane.setMargin(vBox, new Insets(10, 0, 0, 10));

    } catch (Exception e) {
      // on any error, display the stack trace
      e.printStackTrace();
    }
  }

  /**
   * Creates a UI with three buttons and a label.
   * @return a vBox populated with buttons and labels
   */
  private VBox controlsVBox() {

    Label label = new Label("Current feature count: ");
    featureCountLabel = new Label("loading...");

    applyExpressionButton = new Button("Apply definition expression");
    applyFilterButton = new Button("Apply display filter");
    resetButton = new Button("Reset");

    var buttonVBox = new VBox(5);
    buttonVBox.setMinWidth(200);
    buttonVBox.getChildren().addAll(applyExpressionButton, applyFilterButton, resetButton);

    applyExpressionButton.prefWidthProperty().bind(buttonVBox.widthProperty());
    applyFilterButton.prefWidthProperty().bind(buttonVBox.widthProperty());
    resetButton.prefWidthProperty().bind(buttonVBox.widthProperty());

    VBox controlsVBox = new VBox(10);
    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, 100);
    controlsVBox.getStyleClass().add("panel-region");
    var hBox = new HBox();
    hBox.getChildren().addAll(label, featureCountLabel);
    controlsVBox.getChildren().addAll(hBox, buttonVBox);

    return controlsVBox;
  }

  /**
   * 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);
  }

}