Browse WFS layers

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Sample viewer app

Browse a WFS service for layers and add them to the map.

Image of browse WFS layers

Use case

Services often have multiple layers available for display. For example, a feature service for a city might have layers representing roads, land masses, building footprints, parks, and facilities. A user can choose to only show the road network and parks for a park accessibility analysis.

How to use the sample

A list of layers in the WFS service will be shown. Select a layer to display it.

How it works

  1. Create a WfsService object with a URL to a WFS feature service.
  2. Obtain a list of WfsLayerInfo from WfsService.getServiceInfo().getLayerInfos().
  3. When a layer is selected, create a WfsFeatureTable from the WfsLayerInfo.
  4. Create a feature layer from the feature table.
  5. Add the feature layer to the map.

Relevant API

  • FeatureLayer
  • WfsFeatureTable
  • WfsLayerInfo
  • WfsService
  • WfsServiceInfo

About the data

The sample is configured with a sample WFS service, but you can load other WFS services if desired. The default service shows Seattle downtown features hosted on ArcGIS Online.

Tags

browse, catalog, feature, layers, OGC, service, web, WFS

Sample Code

BrowseWfsLayersSample.java
                                                                                                                                                                                                          
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/*
 * Copyright 2019 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.browse_wfs_layers;

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.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.layout.StackPane;
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.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.view.MapView;
import com.esri.arcgisruntime.ogc.wfs.OgcAxisOrder;
import com.esri.arcgisruntime.ogc.wfs.WfsFeatureTable;
import com.esri.arcgisruntime.ogc.wfs.WfsLayerInfo;
import com.esri.arcgisruntime.ogc.wfs.WfsService;
import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol;
import com.esri.arcgisruntime.symbology.SimpleRenderer;

import java.util.List;

public class BrowseWfsLayersSample extends Application {

  private MapView mapView;
  private ArcGISMap map;
  private ProgressIndicator progressIndicator;

  // keep loadables in scope to avoid garbage collection
  private WfsService wfsService;
  private WfsFeatureTable wfsFeatureTable;

  @Override
  public void start(Stage stage) throws Exception {

    // create stack pane and JavaFX app scene
    StackPane stackPane = new StackPane();
    Scene scene = new Scene(stackPane);
    scene.getStylesheets().add(getClass().getResource("/browse_wfs_layers/style.css").toExternalForm());

    // set title, size, and add JavaFX scene to stage
    stage.setTitle("Browse WFS Layers");
    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 list view to show all of the layers in a WFS service
    ListView<WfsLayerInfo> wfsLayerNamesListView = new ListView<>();
    wfsLayerNamesListView.setMaxSize(200, 160);

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

    // create a map with the standard imagery basemap style
    map = new ArcGISMap(BasemapStyle.ARCGIS_IMAGERY_STANDARD);

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

    // create a WFS service with a URL and load it
    wfsService = new WfsService("https://dservices2.arcgis.com/ZQgQTuoyBrtmoGdP/arcgis/services/Seattle_Downtown_Features/WFSServer?service=wfs&request=getcapabilities");
    wfsService.loadAsync();

    // when the WFS service has loaded, add its layer information to the list view for browsing
    wfsService.addDoneLoadingListener(() -> {
      progressIndicator.setVisible(false);
      if (wfsService.getLoadStatus() == LoadStatus.LOADED) {
        // add the list of WFS layers to the list view
        List<WfsLayerInfo> wfsLayerInfos = wfsService.getServiceInfo().getLayerInfos();
        wfsLayerNamesListView.getItems().addAll(wfsLayerInfos);
      } else {
        Alert alert = new Alert(Alert.AlertType.ERROR, "WFS Service Failed to Load!");
        alert.show();
      }
    });

    // populate the list view with layer names
    wfsLayerNamesListView.setCellFactory(list -> new ListCell<>() {

      @Override
      protected void updateItem(WfsLayerInfo wfsLayerInfo, boolean bln) {
        super.updateItem(wfsLayerInfo, bln);
        if (wfsLayerInfo != null) {
          String fullNameOfWfsLayer = wfsLayerInfo.getName();
          String[] split = fullNameOfWfsLayer.split(":");
          String smallName = split[1];
          setText(smallName);
        }
      }
    });

    // load the selected layer from the list view when the layer is selected
    wfsLayerNamesListView.getSelectionModel().selectedItemProperty().addListener(observable ->
      updateMap(wfsLayerNamesListView.getSelectionModel().getSelectedItem())
    );

    // add the controls to the stack pane
    stackPane.getChildren().addAll(mapView, wfsLayerNamesListView, progressIndicator);
    StackPane.setAlignment(wfsLayerNamesListView, Pos.TOP_LEFT);
    StackPane.setMargin(wfsLayerNamesListView, new Insets(10));
  }

  /**
   * Adds a WfsLayerInfo to the map's operational layers, with a random color renderer.
   * @param wfsLayerInfo the WfsLayerInfo that the map will display
   */
  private void updateMap(WfsLayerInfo wfsLayerInfo){

    progressIndicator.setVisible(true);

    // clear the map's operational layers
    map.getOperationalLayers().clear();

    // create a WFSFeatureTable from the WFSLayerInfo
    wfsFeatureTable = new WfsFeatureTable(wfsLayerInfo);

    // set the feature request mode to manual. The table must be manually populated as panning and zooming won't request features automatically.
    wfsFeatureTable.setFeatureRequestMode(ServiceFeatureTable.FeatureRequestMode.MANUAL_CACHE);
    // define the coordinate order for the WFS service
    wfsFeatureTable.setAxisOrder(OgcAxisOrder.NO_SWAP);

    // create a feature layer to visualize the WFS features
    FeatureLayer wfsFeatureLayer = new FeatureLayer(wfsFeatureTable);

    // populate the table and then remove progress indicator and set the viewpoint to that of the layer's full extent when done.
    wfsFeatureTable.populateFromServiceAsync(new QueryParameters(), false, null ).addDoneListener(()->{
      progressIndicator.setVisible(false);
      mapView.setViewpointGeometryAsync(wfsFeatureLayer.getFullExtent(), 50);
    });

    // apply a renderer to the feature layer once the table is loaded (the renderer is based on the table's geometry type)
    wfsFeatureTable.addDoneLoadingListener(()->{
      switch (wfsFeatureTable.getGeometryType()) {
        case POINT:
          wfsFeatureLayer.setRenderer(new SimpleRenderer(new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, 0xff00f5ff, 4)));
          break;
        case POLYGON:
          wfsFeatureLayer.setRenderer(new SimpleRenderer(new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, 0xfff8ff00, null)));
          break;
        case POLYLINE:
          wfsFeatureLayer.setRenderer(new SimpleRenderer(new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xffff0000, 2)));
          break;
      }
    });

    // add the layer to the map's operational layers
    map.getOperationalLayers().add(wfsFeatureLayer);
  }

  /**
   * 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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