ArcGIS Runtime SDK for Java

Delete Features

Demonstrates how to delete a Feature from a FeatureLayer using a feature service.

How it works

To delete a Feature from a ServiceFeatureTable:

  1. Create a service feature table from a URL.
  2. Create a FeatureLayer from the service feature table.
  3. Select features from the feature layer via FeatureLayer.selectFeatures().
  4. Remove the selected features from the ServiceFeatureTable using ServiceFeatureTable.deleteFeaturesAsync().
  5. Update the table on the server using ServiceFeatureTable.applyEditsAsync().

Code

/*
 * Copyright 2017 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.editing.delete_features;

import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.stream.Collectors;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Insets;
import javafx.geometry.Point2D;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Button;
import javafx.scene.input.MouseButton;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.Feature;
import com.esri.arcgisruntime.data.FeatureEditResult;
import com.esri.arcgisruntime.data.FeatureQueryResult;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.view.IdentifyLayerResult;
import com.esri.arcgisruntime.mapping.view.MapView;

public class DeleteFeaturesSample extends Application {

  private MapView mapView;
  private FeatureLayer featureLayer;
  private ServiceFeatureTable featureTable;
  private Button deleteButton;
  private ListenableFuture<FeatureQueryResult> selectionResult;

  private static final String FEATURE_LAYER_URL =
      "http://sampleserver6.arcgisonline.com/arcgis/rest/services/DamageAssessment/FeatureServer/0";

  @Override
  public void start(Stage stage) {

    try {
      // create stack pane and application scene
      StackPane stackPane = new StackPane();
      Scene scene = new Scene(stackPane);

      // set title, size, and add scene to stage
      stage.setTitle("Delete Features Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(scene);
      stage.show();

      // create a delete button and fill the width of the screen
      deleteButton = new Button("Delete");
      deleteButton.setMaxWidth(130);
      deleteButton.setDisable(true);

      // create event to delete the selected features on click
      deleteButton.setOnAction(event -> {
        // get selected features
        selectionResult = featureLayer.getSelectedFeaturesAsync();
        selectionResult.addDoneListener(() -> {
          try {
            FeatureQueryResult selected = selectionResult.get();
            // delete selected features
            deleteFeatures(selected, featureTable);
          } catch (InterruptedException | ExecutionException e) {
            displayMessage("Cannot delete features", e.getCause().getMessage());
          }
        });
      });

      // create a map with streets basemap
      ArcGISMap map = new ArcGISMap(Basemap.Type.STREETS, 40, -95, 4);

      // create a view for this ArcGISMap
      mapView = new MapView();

      // create service feature table from URL
      featureTable = new ServiceFeatureTable(FEATURE_LAYER_URL);

      // create a feature layer from table
      featureLayer = new FeatureLayer(featureTable);

      // add the layer to the ArcGISMap
      map.getOperationalLayers().add(featureLayer);

      mapView.setOnMouseClicked(event -> {
        // check for primary or secondary mouse click
        if (event.isStillSincePress() && event.getButton() == MouseButton.PRIMARY) {
          // create a point from where the user clicked
          Point2D point = new Point2D(event.getX(), event.getY());
          // identify the clicked feature
          ListenableFuture<IdentifyLayerResult> results = mapView.identifyLayerAsync(featureLayer, point, 1, false);
          results.addDoneListener(() -> {
            try {
              IdentifyLayerResult layer = results.get();
              // search the layers for identified features
              List<Feature> features = layer.getElements().stream().filter(g -> g instanceof Feature).map(
                  g -> (Feature) g).collect(Collectors.toList());
              // add the clicked feature to the selection
              if (features.size() > 0) {
                featureLayer.selectFeatures(features);
                deleteButton.setDisable(false);
              }
            } catch (InterruptedException | ExecutionException e) {
              displayMessage("Exception getting identify result", e.getCause().getMessage());
            }
          });
        }
      });

      // set ArcGISMap to be displayed in map view
      mapView.setMap(map);

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

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

  /**
   * Deletes features from a ServiceFeatureTable and applies the changes to the
   * server.
   */
  private void deleteFeatures(FeatureQueryResult features, ServiceFeatureTable featureTable) {

    // delete feature from the feature table and apply edit to server
    featureTable.deleteFeaturesAsync(features).addDoneListener(() -> applyEdits(featureTable));
  }

  /**
   * Sends any edits on the ServiceFeatureTable to the server.
   *
   * @param featureTable service feature table
   */
  private void applyEdits(ServiceFeatureTable featureTable) {

    // apply the changes to the server
    ListenableFuture<List<FeatureEditResult>> editResult = featureTable.applyEditsAsync();
    editResult.addDoneListener(() -> {
      try {
        List<FeatureEditResult> edits = editResult.get();
        // check if the server edit was successful
        if (edits != null && edits.size() > 0) {
          if (!edits.get(0).hasCompletedWithErrors()) {
            displayMessage(null, "Feature successfully deleted");
          } else {
            throw edits.get(0).getError();
          }
        }
      } catch (InterruptedException | ExecutionException e) {
        displayMessage("Exception applying edits on server", e.getCause().getMessage());
      }
    });
  }

  /**
   * Shows a message in an alert dialog.
   *
   * @param title title of alert
   * @param message message to display
   */
  private void displayMessage(String title, String message) {

    Platform.runLater(() -> {
      Alert dialog = new Alert(AlertType.INFORMATION);
      dialog.setHeaderText(title);
      dialog.setContentText(message);
      dialog.showAndWait();
    });
  }

  /**
   * 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);
  }

}


In this topic
  1. How it works
  2. Code