Create symbol styles from web styles

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/*
 * Copyright 2021 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.create_symbol_styles_from_web_styles;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutionException;

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.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
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.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.symbology.Symbol;
import com.esri.arcgisruntime.symbology.SymbolStyle;
import com.esri.arcgisruntime.symbology.UniqueValueRenderer;

public class CreateSymbolStylesFromWebStylesSample extends Application {

  private MapView mapView;
  private GridPane legendGridPane;
  private SymbolStyle symbolStyle;
  private VBox vBox;

  @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("Create Symbol Styles From Web Styles 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 light gray basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_LIGHT_GRAY);

      // set an initial reference scale on the map for controlling symbol size
      map.setReferenceScale(100000);

      // 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(34.28301, -118.44186, 7000));

      // create a feature layer from a service
      FeatureLayer featureLayer = new FeatureLayer(new ServiceFeatureTable(
        "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/LA_County_Points_of_Interest/FeatureServer/0"));

      // add the feature layer to the map's operational layers
      map.getOperationalLayers().add(featureLayer);

      // display an error if the feature layer fails to load
      featureLayer.addDoneLoadingListener(() -> {
        if (featureLayer.getLoadStatus() == LoadStatus.FAILED_TO_LOAD) {
          new Alert(Alert.AlertType.ERROR, "Feature layer failed to load. Details: \n"
            + featureLayer.getLoadError().getCause().getMessage()).show();
        }
      });

      // create a unique value renderer
      UniqueValueRenderer uniqueValueRenderer = new UniqueValueRenderer();

      // add the name of a field from the feature layer data that symbols will be mapped to
      uniqueValueRenderer.getFieldNames().add("cat2");

      // set the unique value renderer on the feature layer
      featureLayer.setRenderer(uniqueValueRenderer);

      // create a symbol style from a web style
      // note: ArcGIS Online is used as the default portal when null is passed as the portal parameter
      symbolStyle = new SymbolStyle("Esri2DPointSymbolsStyle", null);

      // display an error if the symbol style fails to load
      symbolStyle.addDoneLoadingListener(() -> {
        if (symbolStyle.getLoadStatus() == LoadStatus.FAILED_TO_LOAD) {
          new Alert(Alert.AlertType.ERROR, "Error: could not load symbol style. Details: \n"
            + symbolStyle.getLoadError().getMessage()).show();
        }
      });

      // setup the UI for the legend
      setupLegend();

      // create a list of the required symbol names from the web style
      ArrayList<String> symbolNames = new ArrayList<>(Arrays.asList("atm", "beach", "campground", "city-hall", "hospital",
        "library", "park", "place-of-worship", "police-station", "post-office", "school", "trail"));

      // create unique values for the renderer and construct a symbol for each feature
      for (String symbolName : symbolNames) {

        // search for each symbol in the symbol style
        ListenableFuture<Symbol> searchResult = symbolStyle.getSymbolAsync(Collections.singletonList(symbolName));
        searchResult.addDoneListener(() -> {
          try {
            // get the symbol from the search result
            Symbol symbol = searchResult.get();

            // get a list of all categories to be mapped to the symbol
            List<String> categories = mapSymbolNameToField(symbolName);

            for (String category : categories) {

              // create a unique value for each category
              UniqueValueRenderer.UniqueValue uniqueValue = new UniqueValueRenderer.UniqueValue(
                "", symbolName, symbol, Collections.singletonList(category));

              // add each unique value to the unique value renderer
              uniqueValueRenderer.getUniqueValues().add(uniqueValue);
            }

            // create and add an image view and a label for the symbol to the legend on the UI
            ImageView imageView = createImageView(symbol);
            Label gridPaneLabel = new Label(symbolName);
            legendGridPane.add(imageView, 0, symbolNames.indexOf(symbolName));
            legendGridPane.add(gridPaneLabel, 1, symbolNames.indexOf(symbolName));

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

      // add a map scale listener on the map view to control the symbol sizes at different scales
      mapView.mapScaleProperty().addListener((observable, oldValue, newValue) -> {
        featureLayer.setScaleSymbols((double) newValue >= 80000);
      });

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

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

  }

  /**
   * Creates a legend on the UI for the symbol styles.
   */
  private void setupLegend() {

    // create a box to show the legend
    vBox = new VBox();
    vBox.setMaxSize(250, 300);
    vBox.setBackground(new Background(new BackgroundFill(Paint.valueOf("rgba(255, 255, 255 , 0.7)"), CornerRadii.EMPTY,
      Insets.EMPTY)));
    vBox.setPadding(new Insets(10.0));
    vBox.setAlignment(Pos.TOP_CENTER);
    vBox.setSpacing(10);

    // create a grid pane
    legendGridPane = new GridPane();
    legendGridPane.getColumnConstraints().add(new ColumnConstraints(50));
    legendGridPane.setPadding(new Insets(10));
    legendGridPane.setMaxWidth(175);
    legendGridPane.setVgap(12);

    // create a label to display the symbol style name as the title of the legend and add to the grid pane
    Label legendHeader = new Label("Style: " + symbolStyle.getStyleName());
    legendHeader.setStyle("-fx-font-size: 12; -fx-font-weight: bold;");

    // create a scroll pane to contain the legend
    ScrollPane scrollPane = new ScrollPane();
    scrollPane.setContent(legendGridPane);
    vBox.getChildren().addAll(legendHeader, scrollPane);
  }

  /**
   * Returns a list of categories to be matched to a symbol name.
   *
   * @param symbolName the name of a symbol from a symbol style
   * @return categories a list of categories matched to the provided symbol name
   */
  private List<String> mapSymbolNameToField(String symbolName) {

    List<String> categories = new ArrayList<>();

    switch (symbolName) {
      case "atm":
        categories.add("Banking and Finance");
        break;
      case "beach":
        categories.add("Beaches and Marinas");
        break;
      case "campground":
        categories.add("Campgrounds");
        break;
      case "city-hall":
        categories.addAll(Arrays.asList("City Halls", "Government Offices"));
        break;
      case "hospital":
        categories.addAll(Arrays.asList("Hospitals and Medical Centers", "Health Screening and Testing", "Health Centers",
          "Mental Health Centers"));
        break;
      case "library":
        categories.add("Libraries");
        break;
      case "park":
        categories.add("Parks and Gardens");
        break;
      case "place-of-worship":
        categories.add("Churches");
        break;
      case "police-station":
        categories.add("Sheriff and Police Stations");
        break;
      case "post-office":
        categories.addAll(Arrays.asList("DHL Locations", "Federal Express Locations"));
        break;
      case "school":
        categories.addAll(Arrays.asList("Public High Schools", "Public Elementary Schools", "Private and Charter Schools"));
        break;
      case "trail":
        categories.add("Trails");
        break;
    }
    return categories;
  }

  /**
   * Returns an image view populated with a symbol.
   *
   * @param symbol the symbol to display in the image view
   * @return imageView the image view populated with the symbol
   */
  private ImageView createImageView(Symbol symbol) {

    // create an image view for displaying the symbol in the legend
    ImageView imageView = new ImageView();
    ListenableFuture<Image> imageOfSymbol = symbol.createSwatchAsync(Color.TRANSPARENT, 1f);
    imageOfSymbol.addDoneListener(() -> {
      try {
        // add the symbol image to the image view
        imageView.setImage(imageOfSymbol.get());
      } catch (InterruptedException | ExecutionException e) {
        new Alert(Alert.AlertType.ERROR, "Error creating preview ImageView from provided symbol").show();
      }
    });
    return imageView;
  }

  /**
   * 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);
  }

}