Handle thresholds getRegionalResults and getSingleCutoffGrid

Handle `threshold` taken as the query parameter and when to check for `cutoffsMinutes` vs `dualAccessibilityThresholds`.

src/main/java/com/conveyal/analysis/controllers/RegionalAnalysisController.java

@@ -192,28 +192,31 @@ private record HumanKey(FileStorageKey storageKey, String humanName) { };
     private HumanKey getSingleCutoffGrid (
             RegionalAnalysis analysis,
             OpportunityDataset destinations,
-            int cutoffMinutes,
+            int threshold,
             int percentile,
             FileStorageFormat fileFormat
     ) throws IOException {
         final String regionalAnalysisId = analysis._id;
         final String destinationPointSetId = destinations._id;
         // Selecting the zeroth cutoff still makes sense for older analyses that don't allow an array of N cutoffs.
-        int cutoffIndex = 0;
-        if (analysis.cutoffsMinutes != null) {
-            cutoffIndex = new TIntArrayList(analysis.cutoffsMinutes).indexOf(cutoffMinutes);
-            checkState(cutoffIndex >= 0);
+        int thresholdIndex = 0;
+        if (analysis.request.includeTemporalDensity) {
+            thresholdIndex = new TIntArrayList(analysis.request.dualAccessibilityThresholds).indexOf(threshold);
+            checkState(thresholdIndex >= 0);
+        } else if (analysis.cutoffsMinutes != null) {
+            thresholdIndex = new TIntArrayList(analysis.cutoffsMinutes).indexOf(threshold);
+            checkState(thresholdIndex >= 0);
         }
         LOG.info(
             "Returning {} minute accessibility to pointset {} (percentile {}) for regional analysis {} in format {}.",
-            cutoffMinutes, destinationPointSetId, percentile, regionalAnalysisId, fileFormat
+                threshold, destinationPointSetId, percentile, regionalAnalysisId, fileFormat
         );
         // Analysis grids now have the percentile and cutoff in their S3 key, because there can be many of each.
         // We do this even for results generated by older workers, so they will be re-extracted with the new name.
         // These grids are reasonably small, we may be able to just send all cutoffs to the UI instead of selecting.
         String singleCutoffKey = String.format(
             "%s_%s_P%d_C%d.%s",
-            regionalAnalysisId, destinationPointSetId, percentile, cutoffMinutes,
+                regionalAnalysisId, destinationPointSetId, percentile, threshold,
             fileFormat.extension.toLowerCase(Locale.ROOT)
         );
         FileStorageKey singleCutoffFileStorageKey = new FileStorageKey(RESULTS, singleCutoffKey);
@@ -247,7 +250,7 @@ private HumanKey getSingleCutoffGrid (
             LOG.debug("Single-cutoff grid {} not found on S3, deriving it from {}.", singleCutoffKey, multiCutoffKey);
 
             InputStream multiCutoffInputStream = new FileInputStream(fileStorage.getFile(multiCutoffFileStorageKey));
-            Grid grid = new SelectingGridReducer(cutoffIndex).compute(multiCutoffInputStream);
+            Grid grid = new SelectingGridReducer(thresholdIndex).compute(multiCutoffInputStream);
 
             File localFile = FileUtils.createScratchFile(fileFormat.toString());
             FileOutputStream fos = new FileOutputStream(localFile);
@@ -270,7 +273,7 @@ private HumanKey getSingleCutoffGrid (
         String analysisHumanName = humanNameForEntity(analysis);
         String destinationHumanName = humanNameForEntity(destinations);
         String resultHumanFilename = filenameCleanString(
-                String.format("%s_%s_P%d_C%d", analysisHumanName, destinationHumanName, percentile, cutoffMinutes)
+                String.format("%s_%s_P%d_C%d", analysisHumanName, destinationHumanName, percentile, threshold)
             ) + "." + fileFormat.extension.toLowerCase(Locale.ROOT);
         // Note that the returned human filename already contains the appropriate extension.
         return new HumanKey(singleCutoffFileStorageKey, resultHumanFilename);
@@ -405,17 +408,26 @@ private UrlWithHumanName getRegionalResults (Request req, Response res) throws I
         // For newer analyses that have multiple cutoffs, percentiles, or destination pointsets, these initial values
         // are coming from deprecated fields, are not meaningful and will be overwritten below from query parameters.
         int percentile = analysis.travelTimePercentile;
-        int cutoffMinutes = analysis.cutoffMinutes;
+        int threshold = analysis.cutoffMinutes;
         String destinationPointSetId = analysis.grid;
 
-        // Handle newer regional analyses with multiple cutoffs in an array.
-        // If a query parameter is supplied, range check it, otherwise use the middle value in the list.
-        // The cutoff variable holds the actual cutoff in minutes, not the position in the array of cutoffs.
-        if (analysis.cutoffsMinutes != null) {
+        if (analysis.request.includeTemporalDensity) {
+            int nThresholds = analysis.request.dualAccessibilityThresholds.length;
+            int[] thresholds = analysis.request.dualAccessibilityThresholds;
+            checkState(nThresholds > 0, "Regional analysis has no thresholds.");
+            threshold = getIntQueryParameter(req, "threshold", thresholds[nThresholds / 2]);
+            checkArgument(new TIntArrayList(thresholds).contains(threshold),
+                    "Dual accessibility thresholds for this regional analysis must be taken from this list: (%s)",
+                    Ints.join(", ", thresholds)
+            );
+        } else if (analysis.cutoffsMinutes != null) {
+            // Handle newer regional analyses with multiple cutoffs in an array.
+            // If a query parameter is supplied, range check it, otherwise use the middle value in the list.
+            // The cutoff variable holds the actual cutoff in minutes, not the position in the array of cutoffs.
             int nCutoffs = analysis.cutoffsMinutes.length;
             checkState(nCutoffs > 0, "Regional analysis has no cutoffs.");
-            cutoffMinutes = getIntQueryParameter(req, "cutoff", analysis.cutoffsMinutes[nCutoffs / 2]);
-            checkArgument(new TIntArrayList(analysis.cutoffsMinutes).contains(cutoffMinutes),
+            threshold = getIntQueryParameter(req, "cutoff", analysis.cutoffsMinutes[nCutoffs / 2]);
+            checkArgument(new TIntArrayList(analysis.cutoffsMinutes).contains(threshold),
                     "Travel time cutoff for this regional analysis must be taken from this list: (%s)",
                     Ints.join(", ", analysis.cutoffsMinutes)
             );
@@ -452,7 +464,7 @@ private UrlWithHumanName getRegionalResults (Request req, Response res) throws I
         }
         // Significant overhead here: UI contacts backend, backend calls S3, backend responds to UI, UI contacts S3.
         OpportunityDataset destinations = getDestinations(destinationPointSetId, userPermissions);
-        HumanKey gridKey = getSingleCutoffGrid(analysis, destinations, cutoffMinutes, percentile, format);
+        HumanKey gridKey = getSingleCutoffGrid(analysis, destinations, threshold, percentile, format);
         res.type(APPLICATION_JSON.asString());
         return fileStorage.getJsonUrl(gridKey.storageKey, gridKey.humanName);
     }