Identify layers

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
/*
 * 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.identify_layers;

import java.util.List;
import java.util.concurrent.ExecutionException;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.FeatureTable;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.layers.ArcGISMapImageLayer;
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.IdentifyLayerResult;
import com.esri.arcgisruntime.mapping.view.MapView;
import javafx.application.Application;
import javafx.geometry.Point2D;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.input.MouseButton;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class IdentifyLayersSample extends Application {

  private MapView mapView;
  // keep loadables in scope to avoid garbage collection
  private ArcGISMapImageLayer mapImageLayer;
  private FeatureLayer featureLayer;

  /**
   * Opens and runs application.
   *
   * @param args arguments passed to this application
   */
  public static void main(String[] args) {

    Application.launch(args);
  }

  @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("Identify Layers 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 topographic basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);

      // 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(40.26684, -100.98579, 68015210));

      // add a map image layer with one sublayer visible
      mapImageLayer = new ArcGISMapImageLayer("https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer");
      mapImageLayer.addDoneLoadingListener(() -> {
        if (mapImageLayer.getLoadStatus() == LoadStatus.LOADED) {
          // hide Continent and World layers
          mapImageLayer.getSubLayerContents().get(1).setVisible(false);
          mapImageLayer.getSubLayerContents().get(2).setVisible(false);
        } else {
          new Alert(Alert.AlertType.ERROR, "Failed to load the map image layer").show();
        }
      });
      map.getOperationalLayers().add(mapImageLayer);

      // add a feature layer to the map's operational layers
      FeatureTable featureTable = new ServiceFeatureTable("https://sampleserver6.arcgisonline.com/arcgis/rest/services/DamageAssessment/FeatureServer/0");
      featureLayer = new FeatureLayer(featureTable);
      featureLayer.addDoneLoadingListener(() -> {
        if (mapImageLayer.getLoadStatus() != LoadStatus.LOADED) {
          new Alert(Alert.AlertType.ERROR, "Failed to load the feature layer").show();
        }
      });
      map.getOperationalLayers().add(featureLayer);

      // create map view click listener
      mapView.setOnMouseClicked(e -> {
        if (e.isStillSincePress() && e.getButton() == MouseButton.PRIMARY) {

          // identify layers with GeoElements where the user clicked
          Point2D point2D = new Point2D(e.getX(), e.getY());
          ListenableFuture<List<IdentifyLayerResult>> identifyResults = mapView.identifyLayersAsync(point2D, 12, false, 10);
          identifyResults.addDoneListener(() -> {
            try {
              // build a string with the total count of identified GeoElements for each layer
              StringBuilder resultsList = new StringBuilder();
              List<IdentifyLayerResult> results = identifyResults.get();
              // for each result layer, recursively search its sublayers to get the total count of GeoElements
              for (IdentifyLayerResult result : results) {
                int recursiveGeoElementCount = searchGeoElements(result);
                resultsList.append(result.getLayerContent().getName()).append(": ").append(recursiveGeoElementCount).append("\n");
              }
              // show the result counts string in a dialog
              String resultString = resultsList.toString();
              Alert alert = new Alert(Alert.AlertType.INFORMATION, resultString.equals("") ? "No Results" : resultString);
              alert.initOwner(mapView.getScene().getWindow());
              alert.show();
            } catch (InterruptedException | ExecutionException ex) {
              new Alert(Alert.AlertType.ERROR, "Failed to identify layers").show();
            }
          });
        }
      });

      // add the map view to stack pane
      stackPane.getChildren().add(mapView);
    } catch (Exception e) {
      // on any error, display the stack trace.
      e.printStackTrace();
    }
  }

  /**
   * Searches an identify layer result recursively to find the identified GeoElements for all identified sublayers.
   *
   * @param layerResult identify layer result
   * @return recursive identified GeoElements count
   */
  private int searchGeoElements(IdentifyLayerResult layerResult) {
    int identifiedSubLayerGeoElements = 0;
    for (IdentifyLayerResult subLayerResult : layerResult.getSublayerResults()) {
      identifiedSubLayerGeoElements += searchGeoElements(subLayerResult);
    }
    return layerResult.getElements().size() + identifiedSubLayerGeoElements;
  }

  /**
   * Stops and releases all resources used in application.
   */
  @Override
  public void stop() {

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

}