Work with trace results

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// Execute the network utility trace.
ListenableFuture<List<UtilityTraceResult>> utilityTraceResultsListenableFuture =
    utilityNetwork.traceAsync(utilityTraceParameters);

// Wait for the trace to complete.
utilityTraceResultsListenableFuture.addDoneListener(() -> {
    try {
        // Get the trace results.
        List<UtilityTraceResult> utilityTraceResults = utilityTraceResultsListenableFuture.get();

        // Check that there is a trace result, then get the first result of the utility trace.
        if (utilityTraceResults.getFirst() != null &&
            utilityTraceResults.getFirst() instanceof UtilityElementTraceResult utilityElementTraceResult) {

            // Get the elements in the trace result.
            List<UtilityElement> utilityElements = utilityElementTraceResult.getElements();

            if (!utilityElements.isEmpty()) {
                // Check if there are any elements in the first trace result.
                System.out.println("Count of utility elements in first trace result is: "
                        + utilityElements.size());

                // Process trace results here.

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// (continued from above)

                // Make a hash map of key-value pairs where key is the name of a utility network source
                // and value is a list of utility elements in that utility network source.
                HashMap<String, List<UtilityElement>> hashMap = new HashMap<>();

                for (UtilityElement utilityElement : utilityElements) {
                    // Group together utility elements that have the same network source.
                    List<UtilityElement> utilityElementsWithSameNetworkSource;

                    String utilityNetworkSourceName = utilityElement.getNetworkSource().getName();

                    // If the utility network source name is already a key, then get the
                    // corresponding list of elements.
                    if (hashMap.containsKey(utilityNetworkSourceName)) {
                        utilityElementsWithSameNetworkSource = hashMap.get(utilityNetworkSourceName);
                    } else {
                        // If utility network source name is not a key, create a new list of elements.
                        utilityElementsWithSameNetworkSource = new ArrayList<>();
                    }

                    // Add current utility element to the list of elements.
                    utilityElementsWithSameNetworkSource.add(utilityElement);

                    // Update the hash map with the new/modified key-value pair.
                    hashMap.put(utilityNetworkSourceName, utilityElementsWithSameNetworkSource);
                }

                // Ensure that the features' layer exists in the map.
                for (Map.Entry<String, List<UtilityElement>> entry : hashMap.entrySet()) {
                    FeatureLayer layer = (FeatureLayer) map.getOperationalLayers().getFirst();

                    if (layer.getFeatureTable().getTableName().equalsIgnoreCase(entry.getKey())) {
                        // Get the features that correspond to the elements.
                        ListenableFuture<List<ArcGISFeature>> arcGISFeatureListListenableFuture =
                            utilityNetwork.fetchFeaturesForElementsAsync(entry.getValue());

                        arcGISFeatureListListenableFuture.addDoneListener(() -> {
                            try {
                                List<ArcGISFeature> arcGISFeatureList = arcGISFeatureListListenableFuture.get();

                                // Do something with the features.

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// (continued from above)

                                // Select features to highlight result.
                                for (ArcGISFeature arcGISFeature : arcGISFeatureList) {
                                    layer.selectFeature(arcGISFeature);
                                }
                            } catch (InterruptedException | ExecutionException e) {
                                e.printStackTrace();
                            }
                        }); // End of arcGISFeatureListListenableFuture.addDoneListener(() -> {
                    } // End of if (layer.getFeatureTable().getTableName().equalsIgnoreCase(entry.getKey())) {
                } // End of for (Map.Entry<String, List<UtilityElement>> entry : hashMap.entrySet()) {
            } else {
                System.out.println("First trace result is empty.");
            }
        } // End of if (utilityTraceResults.getFirst() != null &&
          //            utilityTraceResults.getFirst() instanceof UtilityElementTraceResult utilityElementTraceResult) {
    } catch (Exception e) {
        e.printStackTrace();
    }
}); // End of utilityTraceResultsListenableFuture.addDoneListener(() -> {