Update geometries (feature service)

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Update a feature's location in an online feature service.

Image of update geometries feature service

Use case

Sometimes users may want to edit features in an online feature service by moving them.

How to use the sample

Click a feature to select it. Click again to set the updated location for that feature. An alert will be shown confirming success or failure.

How it works

  1. Create a ServiceFeatureTable object from a URL.
  2. Create a FeatureLayer object from the ServiceFeatureTable.
  3. Select a feature from the FeatureLayer using .selectFeature().
  4. Load the selected feature.
  5. Change the selected feature's location using Feature.setGeometry(geometry).
  6. After the change, update the table on the server using .applyEditsAsync().

Relevant API

  • Feature
  • FeatureLayer
  • ServiceFeatureTable

Tags

editing, feature layer, feature table, moving, service, updating

Sample Code

UpdateGeometriesSample.java
                                                                                                                                                                                                                                  
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/*
 * 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.update_geometries;

import java.util.Iterator;
import java.util.List;
import java.util.concurrent.ExecutionException;

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

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.ArcGISFeature;
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.geometry.Point;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.GeoElement;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.IdentifyLayerResult;
import com.esri.arcgisruntime.mapping.view.MapView;

public class UpdateGeometriesSample extends Application {

  private MapView mapView;
  private ServiceFeatureTable featureTable;
  private FeatureLayer featureLayer;
  private ArcGISFeature selectedFeature; // keep loadable in scope to avoid garbage collection

  private static final String FEATURE_LAYER_URL =
      "https://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("Update Geometries 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 streets basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_STREETS);

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

      // set a viewpoint on the map view
      mapView.setViewpoint(new Viewpoint(40, -95, 36978595));

      // add features from a feature service
      featureTable = new ServiceFeatureTable(FEATURE_LAYER_URL);
      featureLayer = new FeatureLayer(featureTable);
      map.getOperationalLayers().add(featureLayer);

      // handle clicks on the map view to select and move features
      mapView.setOnMouseClicked((MouseEvent event) -> {
        if (event.isStillSincePress() && event.getButton() == MouseButton.PRIMARY) {
          // get screen point where user clicked
          Point2D point = new Point2D(event.getX(), event.getY());

          // get map location corresponding to screen point
          Point mapPoint = mapView.screenToLocation(point);

          // identify any clicked feature
          ListenableFuture<IdentifyLayerResult> results = mapView.identifyLayerAsync(featureLayer, point, 1, false, 1);
          results.addDoneListener(() -> {
            try {

              // get selected feature
              List<GeoElement> elements = results.get().getElements();
              if (elements.size() > 0 && elements.get(0) instanceof ArcGISFeature) {

                // clicked on a feature, select it
                ArcGISFeature selected = (ArcGISFeature) elements.get(0);
                featureLayer.clearSelection(); //clear previous selections
                featureLayer.selectFeature(selected);

              } else {

                // didn't click on a feature
                ListenableFuture<FeatureQueryResult> selectedQuery = featureLayer.getSelectedFeaturesAsync();
                selectedQuery.addDoneListener(() -> {
                  try {
                    // check if a feature is currently selected
                    FeatureQueryResult selectedQueryResult = selectedQuery.get();
                    Iterator<Feature> features = selectedQueryResult.iterator();
                    if (features.hasNext()) {
                      // move selected feature to clicked location
                      selectedFeature = (ArcGISFeature) features.next();
                      selectedFeature.loadAsync();
                      selectedFeature.addDoneLoadingListener(() -> {
                        if (selectedFeature.canUpdateGeometry()) {
                          selectedFeature.setGeometry(mapPoint);
                          ListenableFuture<Void> featureTableResult = featureTable.updateFeatureAsync(selectedFeature);
                          // apply the edits to the service
                          featureTableResult.addDoneListener(this::applyEdits);
                        }
                      });

                    } // else nothing currently selected, do nothing

                  } catch (InterruptedException | ExecutionException e) {
                    displayMessage("Exception getting selected feature", e.getCause().getMessage());
                  }
                });
              }
            } catch (InterruptedException | ExecutionException e) {
              displayMessage("Exception getting clicked feature", e.getCause().getMessage());
            }
          });

          // on secondary mouse click, clear feature selection
        } else if (event.isStillSincePress() && event.getButton() == MouseButton.SECONDARY) {
          featureLayer.clearSelection();
        }
      });

      // add the map view to stack pane
      stackPane.getChildren().add(mapView);

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

  /**
   * Sends any edits on the ServiceFeatureTable to the server.
   */
  private void applyEdits() {

    // 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, "Geometry updated");
          } else {
            throw edits.get(0).getError();
          }
        }
      } catch (InterruptedException | ExecutionException e) {
        displayMessage("Error 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(Alert.AlertType.INFORMATION);
      dialog.initOwner(mapView.getScene().getWindow());
      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);
  }
}

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