Feature collection layer from portal

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/*
 * Copyright 2020 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.feature_collection_layer_from_portal;

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.TextField;
import javafx.application.Application;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.data.FeatureCollection;
import com.esri.arcgisruntime.layers.FeatureCollectionLayer;
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.portal.Portal;
import com.esri.arcgisruntime.portal.PortalItem;

public class FeatureCollectionLayerFromPortalSample extends Application {

  private ArcGISMap map;
  private MapView mapView;
  private Portal portal;
  private TextField inputTextField;
  private PortalItem portalItem; // keep loadable in scope to avoid garbage collection

  @Override
  public void start(Stage stage) {
    // set up the application scene
    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("Feature Collection Layer From Portal");
      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 oceans basemap style
      map = new ArcGISMap(BasemapStyle.ARCGIS_OCEANS);

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

      // create portal
      portal = new Portal("https://www.arcgis.com/");

      // create text field to input user's own portal item ID
      inputTextField = new TextField("32798dfad17942858d5eef82ee802f0b");
      inputTextField.setMaxWidth(250);

      // fetch the default feature collection layer from the portal
      fetchFeatureCollectionFromPortal();

      // create button to perform action
      Button fetchFromPortalButton = new Button("Open from portal item");
      fetchFromPortalButton.setMaxWidth(250);

      // verify the input and fetch the portal item
      fetchFromPortalButton.setOnAction(e -> fetchFeatureCollectionFromPortal());

      // add the map view and control panel to stack pane
      stackPane.getChildren().addAll(mapView, inputTextField, fetchFromPortalButton);
      StackPane.setAlignment(inputTextField, Pos.TOP_LEFT);
      StackPane.setMargin(inputTextField, new Insets(10, 0, 0, 10));
      StackPane.setAlignment(fetchFromPortalButton, Pos.TOP_LEFT);
      StackPane.setMargin(fetchFromPortalButton, new Insets(40, 0, 0, 10));

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

  /**
   * Fetch feature collection from portal and load as feature layer.
   */
  private void fetchFeatureCollectionFromPortal() {

    if (!inputTextField.getText().isEmpty()) {
      // crate portal item
      portalItem = new PortalItem(portal, inputTextField.getText());
      portalItem.loadAsync();

      portalItem.addDoneLoadingListener(() -> {

        if (portalItem.getLoadStatus() == LoadStatus.LOADED) {

          if (portalItem.getType() == PortalItem.Type.FEATURE_COLLECTION) {

            // create feature collection and add to the map as a layer
            FeatureCollection  featureCollection = new FeatureCollection(portalItem);
            FeatureCollectionLayer featureCollectionLayer = new FeatureCollectionLayer(featureCollection);

            // add feature collection layer to the map
            map.getOperationalLayers().clear();
            map.getOperationalLayers().add(featureCollectionLayer);

          } else {
            new Alert(Alert.AlertType.ERROR, "Portal item is not a feature collection").show();
          }
        } else {
          new Alert(Alert.AlertType.ERROR, "Portal item failed to load").show();
        }
      });
    } else {
      new Alert(Alert.AlertType.ERROR, "Portal Item ID is empty").show();
    }

  }
  /**
   * 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);
  }
}