Style WMS layer

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/*
 * Copyright 2018 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.style_wms_layer;

import java.util.Collections;
import java.util.List;

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.ToggleButton;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import com.esri.arcgisruntime.layers.WmsLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.geometry.SpatialReference;
import com.esri.arcgisruntime.mapping.view.MapView;

public class StyleWmsLayerSample extends Application {

  private MapView mapView;
  private WmsLayer wmsLayer; // keep loadable in scope to avoid garbage collection

  @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("Style WMS Layer Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(scene);
      stage.show();

      // create a map with spatial reference appropriate for the service (North American Datum 83)
      ArcGISMap map = new ArcGISMap(SpatialReference.create(26915));
      map.setMinScale(7000000);
      // set the map to the map view
      mapView = new MapView();
      mapView.setMap(map);

      // create style toggle button, disable until layer is loaded
      ToggleButton styleToggleButton = new ToggleButton();
      styleToggleButton.setText("Default");
      styleToggleButton.setDisable(true);

      // create a WMS layer
      List<String> wmsLayerNames = Collections.singletonList("mncomp");
      String url = "https://imageserver.gisdata.mn.gov/cgi-bin/mncomp?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetCapabilities";
      wmsLayer = new WmsLayer(url, wmsLayerNames);
      wmsLayer.addDoneLoadingListener(() -> {
        if (wmsLayer.getLoadStatus() == LoadStatus.LOADED) {
          // add the layer to the map
          map.getOperationalLayers().add(wmsLayer);

          // zoom to the layer on the map
          mapView.setViewpoint(new Viewpoint(wmsLayer.getFullExtent()));

          // get styles
          List<String> styles = wmsLayer.getSublayers().get(0).getSublayerInfo().getStyles();

          // set the style when the button is toggled
          styleToggleButton.selectedProperty().addListener((observable, oldValue, newValue) -> {
            if (styleToggleButton.isSelected()) {
              // contrast Stretch - 2 Std. Deviations contrast stretch
              styleToggleButton.setText("Contrast Stretch");
              wmsLayer.getSublayers().get(0).setCurrentStyle(styles.get(1));
            } else {
              // default - color as it appears in aerial imagery
              styleToggleButton.setText("Default");
              wmsLayer.getSublayers().get(0).setCurrentStyle(styles.get(0));
            }
          });

          // enable the toggle button
          styleToggleButton.setDisable(false);

        } else {
          Alert alert = new Alert(Alert.AlertType.ERROR, "Failed to load WMS layer");
          alert.show();
        }
      });
      wmsLayer.loadAsync();

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

}