Generate offline map (overrides)

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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.generate_offline_map_overrides;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Iterator;
import java.util.List;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.GeometryEngine;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.view.Graphic;
import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.portal.Portal;
import com.esri.arcgisruntime.portal.PortalItem;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.tasks.geodatabase.GenerateGeodatabaseParameters;
import com.esri.arcgisruntime.tasks.geodatabase.GenerateLayerOption;
import com.esri.arcgisruntime.tasks.offlinemap.GenerateOfflineMapJob;
import com.esri.arcgisruntime.tasks.offlinemap.GenerateOfflineMapResult;
import com.esri.arcgisruntime.tasks.offlinemap.OfflineMapParametersKey;
import com.esri.arcgisruntime.tasks.offlinemap.OfflineMapTask;
import com.esri.arcgisruntime.tasks.tilecache.ExportTileCacheParameters;

import javafx.application.Platform;
import javafx.fxml.FXML;
import javafx.geometry.Point2D;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.ProgressBar;
import javafx.scene.control.Spinner;
import javafx.scene.paint.Color;

public class GenerateOfflineMapOverridesController {

  @FXML private MapView mapView;
  @FXML private Spinner<Integer> minScaleLevelSpinner;
  @FXML private Spinner<Integer> maxScaleLevelSpinner;
  @FXML private Spinner<Integer> extentBufferDistanceSpinner;
  @FXML private Spinner<Integer> minHydrantFlowRateSpinner;
  @FXML private CheckBox systemValvesCheckBox;
  @FXML private CheckBox serviceConnectionsCheckBox;
  @FXML private CheckBox waterPipesCheckBox;
  @FXML private Button generateOfflineMapButton;
  @FXML private Button cancelJobButton;
  @FXML private ProgressBar progressBar;

  private ArcGISMap map;
  private GraphicsOverlay graphicsOverlay;
  private Graphic downloadArea;
  private GenerateOfflineMapJob job;

  @FXML
  private void initialize() {

    // 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 portal item with the itemId of the web map
    var portal = new Portal("https://www.arcgis.com");
    var portalItem = new PortalItem(portal, "acc027394bc84c2fb04d1ed317aac674");

    // create a map with the portal item
    map = new ArcGISMap(portalItem);
    // display the generate offline map area as a red box on the map
    updateDownloadArea();
    map.addDoneLoadingListener(() -> {
      // enable the generate offline map button when the map is loaded
      if (map.getLoadStatus() == LoadStatus.LOADED) {
        generateOfflineMapButton.setDisable(false);

        // create a graphics overlay for displaying the download area
        graphicsOverlay = new GraphicsOverlay();
        mapView.getGraphicsOverlays().add(graphicsOverlay);

        // show a red border around the download area
        downloadArea = new Graphic();
        graphicsOverlay.getGraphics().add(downloadArea);
        var simpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.RED, 2);
        downloadArea.setSymbol(simpleLineSymbol);

      }
    });

    // update the download area whenever the viewpoint changes
    mapView.addViewpointChangedListener(viewpointChangedEvent -> updateDownloadArea());

    // set the map to the map view
    mapView.setMap(map);
  }

  /**
   * Called when the Generate offline map button is clicked. Builds parameters for the offline map task from the UI
   * inputs and executes the task.
   */
  @FXML
  private void generateOfflineMap() {
    // show the progress bar
    progressBar.setVisible(true);

    // create an offline map task with the map
    var offlineMapTask = new OfflineMapTask(map);

    // get default offline map parameters for this task given the download area
    offlineMapTask.createDefaultGenerateOfflineMapParametersAsync(downloadArea.getGeometry())
      .toCompletableFuture().whenComplete((parameters, exception) -> {
        if (exception == null) {
          // get additional offline parameters (overrides) for this task
          offlineMapTask.createGenerateOfflineMapParameterOverridesAsync(parameters).toCompletableFuture()
            .whenComplete((overrides, throwable) -> {
              if (throwable == null) {
                try {
                  // get the export tile cache parameters for the base layer
                  var basemapParamKey = new OfflineMapParametersKey(
                    mapView.getMap().getBasemap().getBaseLayers().get(0));
                  ExportTileCacheParameters exportTileCacheParameters =
                    overrides.getExportTileCacheParameters().get(basemapParamKey);

                  // create a new sublist of level IDs in the range requested by the user
                  exportTileCacheParameters.getLevelIDs().clear();
                  for (int i = minScaleLevelSpinner.getValue(); i < maxScaleLevelSpinner.getValue(); i++) {
                    exportTileCacheParameters.getLevelIDs().add(i);
                  }
                  // set the area of interest to the original download area plus a buffer
                  exportTileCacheParameters.setAreaOfInterest(GeometryEngine.buffer(downloadArea.getGeometry(),
                    extentBufferDistanceSpinner.getValue()));

                  // configure layer option parameters for each layer depending on the options selected in the UI
                  map.getOperationalLayers().stream()
                    .filter(layer -> layer instanceof FeatureLayer)
                    .map(featureLayer -> (FeatureLayer) featureLayer)
                    .forEach(featureLayer -> {
                      ServiceFeatureTable featureTable = (ServiceFeatureTable) featureLayer.getFeatureTable();
                      long layerId = featureTable.getLayerInfo().getServiceLayerId();
                      // get the layer option parameters specifically for this layer
                      var offlineMapParametersKey = new OfflineMapParametersKey(featureLayer);
                      GenerateGeodatabaseParameters generateGeodatabaseParameters = overrides.getGenerateGeodatabaseParameters()
                        .get(offlineMapParametersKey);
                      List<GenerateLayerOption> layerOptions = generateGeodatabaseParameters.getLayerOptions();
                      // use an iterator so we can remove layer options while looping over them
                      Iterator<GenerateLayerOption> layerOptionsIterator = layerOptions.iterator();
                      if (!layerOptions.isEmpty()) {
                        while (layerOptionsIterator.hasNext()) {
                          GenerateLayerOption layerOption = layerOptionsIterator.next();
                          if (layerOption.getLayerId() == layerId) {
                            switch (featureLayer.getName()) {
                              // remove the System Valve layer from the layer options if it should not be included
                              case "System Valve":
                                if (!systemValvesCheckBox.isSelected()) {
                                  layerOptionsIterator.remove();
                                }
                                break;
                              // remove the Service Connection layer from the layer options if it should not be included
                              case "Service Connection":
                                if (!serviceConnectionsCheckBox.isSelected()) {
                                  layerOptionsIterator.remove();
                                }
                                break;
                              // only download hydrant features if their flow is above the minimum specified in the UI
                              case "Hydrant":
                                layerOption.setWhereClause("FLOW >= " + minHydrantFlowRateSpinner.getValue());
                                layerOption.setQueryOption(GenerateLayerOption.QueryOption.USE_FILTER);
                                break;
                              // clip water main feature geometries to the extent if the checkbox is selected
                              case "Main":
                                layerOption.setUseGeometry(waterPipesCheckBox.isSelected());
                            }
                          }
                        }
                      }
                    });

                  // create an offline map job with the download directory path and parameters and start the job
                  Path tempDirectory = Files.createTempDirectory("offline_map");
                  job = offlineMapTask.generateOfflineMap(parameters, tempDirectory.toAbsolutePath().toString(), overrides);
                  job.start();
                  generateOfflineMapButton.setDisable(true);
                  cancelJobButton.setDisable(false);
                  job.addJobDoneListener(() -> {
                    if (job.getStatus() == GenerateOfflineMapJob.Status.SUCCEEDED) {
                      // replace the current map with the result offline map when the job finishes
                      GenerateOfflineMapResult result = job.getResult();
                      mapView.setMap(result.getOfflineMap());
                      graphicsOverlay.getGraphics().clear();
                      // disable button since the offline map is already generated
                      generateOfflineMapButton.setDisable(true);
                    } else {
                      new Alert(Alert.AlertType.WARNING, job.getError().getMessage()).show();
                      generateOfflineMapButton.setDisable(false);
                    }
                    Platform.runLater(() -> progressBar.setVisible(false));
                    cancelJobButton.setDisable(true);
                  });
                  // show the job's progress with the progress bar
                  job.addProgressChangedListener(() -> progressBar.setProgress(job.getProgress() / 100.0));
                } catch (IOException e){
                  new Alert(Alert.AlertType.ERROR, "Error configuring the offline map task").show();
                }
              } else {
                // if the generation of offline map parameter overrides completed exceptionally, display an error
                new Alert(Alert.AlertType.ERROR, "Error creating override parameters").show();
              }
            });
        } else {
          // if the generation of default offline map parameters completed exceptionally, display an error
          new Alert(Alert.AlertType.ERROR, "Error creating offline map task default parameters").show();
        }
      });
  }

  /**
   * Updates the download area graphic to show a red border around the current view extent that will be downloaded if
   * taken offline.
   */
  private void updateDownloadArea() {
    if (map.getLoadStatus() == LoadStatus.LOADED) {
      // upper left corner of the area to take offline
      Point2D minScreenPoint = new Point2D(50, 50);
      // lower right corner of the downloaded area
      Point2D maxScreenPoint = new Point2D(mapView.getWidth() - 50, mapView.getHeight() - 50);
      // convert screen points to map points
      Point minPoint = mapView.screenToLocation(minScreenPoint);
      Point maxPoint = mapView.screenToLocation(maxScreenPoint);
      // use the points to define and return an envelope
      if (minPoint != null && maxPoint != null) {
        var envelope = new Envelope(minPoint, maxPoint);
        downloadArea.setGeometry(envelope);
      }
    }
  }

  /**
   * Cancels the current offline map job.
   */
  @FXML
  private void cancelJob() {
    if (job != null) {
      job.cancelAsync();
    }
  }

  /**
   * Stops and releases all resources used in the application.
   */
  void terminate() {

    if (mapView != null) {
      mapView.dispose();
    }
  }

}