Feature layer query

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
/*
 * 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.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.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.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.BasemapStyle;
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("/feature_layer_query/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();

      // 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 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);

      // 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 to golden color for the US states with a black color outline
      SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLACK, 1);
      SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, Color.DARKGOLDENROD, 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 map with the topographic basemap style
      final ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);

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

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

      // 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);
  }

}