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Feature Layer Query

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/*
 * Copyright 2017 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.featurelayers.feature_layer_query;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Paint;
import javafx.stage.Stage;

import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.Feature;
import com.esri.arcgisruntime.data.FeatureQueryResult;
import com.esri.arcgisruntime.data.QueryParameters;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleRenderer;

public class FeatureLayerQuerySample extends Application {

  private Alert dialog;

  private MapView mapView;
  private FeatureLayer featureLayer;
  private ServiceFeatureTable featureTable;
  private Point startPoint;
  private ListenableFuture<FeatureQueryResult> tableQueryResult;

  private final int SCALE = 100000000;

  @Override
  public void start(Stage stage) {

    try {
      // create stack pane and application scene
      StackPane stackPane = new StackPane();
      Scene scene = new Scene(stackPane);
      scene.getStylesheets().add(getClass().getResource("/css/style.css").toExternalForm());

      // set title, size, and add scene to stage
      stage.setTitle("Feature Layer Query Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(scene);
      stage.show();

      // create a control panel
      VBox controlsVBox = new VBox(6);
      controlsVBox.setBackground(new Background(new BackgroundFill(Paint.valueOf("rgba(0,0,0,0.3)"), CornerRadii.EMPTY,
          Insets.EMPTY)));
      controlsVBox.setPadding(new Insets(10.0));
      controlsVBox.setMaxSize(250, 80);
      controlsVBox.getStyleClass().add("panel-region");

      // create area for searching
      Label searchLabel = new Label("Search for a State:");
      searchLabel.getStyleClass().add("panel-label");
      TextField searchField = new TextField();
      searchField.setMaxWidth(150);
      Button searchButton = new Button("Search");
      HBox searchBox = new HBox(5);
      searchBox.getChildren().addAll(searchField, searchButton);
      searchBox.setDisable(true);

      // create dialog to display alert information
      dialog = new Alert(AlertType.WARNING);
      dialog.initOwner(stackPane.getScene().getWindow());

      // search for the state that was entered
      searchButton.setOnAction(e -> {
        // clear the selection of the feature
        featureLayer.clearSelection();
        String stateText = searchField.getText();

        if (stateText.trim().length() > 0) {
          searchForState(stateText);
        } else {
          dialog.setContentText("State Not Found! Add a valid state name.");
          dialog.showAndWait();
          mapView.setViewpointCenterAsync(startPoint, SCALE);
        }
      });

      // add search label and box to the control panel
      controlsVBox.getChildren().addAll(searchLabel, searchBox);

      // create a starting point for the view
      startPoint = new Point(-11000000, 5000000, SpatialReferences.getWebMercator());

      // set fill orange (0xFFFFCC00) color for the US states with a black color
      // (0xFF000000) outline
      SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xFF000000, 1);
      SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, 0xFFFFCC00, lineSymbol);

      // create a service feature table
      featureTable = new ServiceFeatureTable("https://services.arcgis.com/jIL9msH9OI208GCb/arcgis/rest/services/USA_Daytime_Population_2016/FeatureServer/0");

      // create a feature layer from table
      featureLayer = new FeatureLayer(featureTable);
      featureLayer.setOpacity(0.8f);
      featureLayer.setMaxScale(10000);

      // enable search once the feature layer is loaded
      featureLayer.addDoneLoadingListener(() -> {
        if (featureLayer.getLoadStatus() == LoadStatus.LOADED) {
          searchBox.setDisable(false);
        } else {
          Alert alert = new Alert(Alert.AlertType.ERROR, "Feature Layer Failed to Load!");
          alert.show();
        }
      });

      // set renderer for feature layer
      featureLayer.setRenderer(new SimpleRenderer(fillSymbol));

      // create a ArcGISMap with basemap topographic
      final ArcGISMap map = new ArcGISMap(Basemap.createTopographic());

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

      // create a view for this ArcGISMap
      mapView = new MapView();
      mapView.setMap(map);

      // set viewpoint to the start point
      mapView.setViewpointCenterAsync(startPoint, SCALE);

      // add the map view and control panel to stack pane
      stackPane.getChildren().addAll(mapView, controlsVBox);
      StackPane.setAlignment(controlsVBox, Pos.TOP_LEFT);
      StackPane.setMargin(controlsVBox, new Insets(10, 0, 0, 10));
    } catch (Exception e) {
      // on any error, display the stack trace
      e.printStackTrace();
    }
  }

  /**
   * Searches for a US state inside the current ServiceFeatureTable.
   * 
   * @param state a US state that is being searched
   */
  private void searchForState(String state) {

    // create a query for the state that was entered
    QueryParameters query = new QueryParameters();
    query.setWhereClause("upper(STATE_NAME) LIKE '" + state.toUpperCase() + "'");

    // search for the state feature in the feature table
    tableQueryResult = featureTable.queryFeaturesAsync(query);

    tableQueryResult.addDoneListener(() -> {
      try {
        // get the result from the query
        FeatureQueryResult result = tableQueryResult.get();
        // if a state feature was found
        if (result.iterator().hasNext()) {
          // get state feature and zoom to it
          Feature feature = result.iterator().next();
          Envelope envelope = feature.getGeometry().getExtent();
          mapView.setViewpointGeometryAsync(envelope, 200);

          // set the state feature to be selected
          featureLayer.selectFeature(feature);
        } else {
          Platform.runLater(() -> {
            dialog.setContentText("State Not Found! Add a valid state name.");
            dialog.showAndWait();
            mapView.setViewpointCenterAsync(startPoint, SCALE);
          });
        }
      } 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);
  }

}

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