add country-coder json [#44]

tiles/src/main/java/com/protomaps/basemap/Basemap.java

@@ -4,6 +4,7 @@
 import com.onthegomap.planetiler.Planetiler;
 import com.onthegomap.planetiler.config.Arguments;
 import com.onthegomap.planetiler.util.Downloader;
+import com.protomaps.basemap.feature.CountryCoder;
 import com.protomaps.basemap.feature.NaturalEarthDb;
 import com.protomaps.basemap.feature.QrankDb;
 import com.protomaps.basemap.layers.Boundaries;
@@ -17,6 +18,7 @@
 import com.protomaps.basemap.layers.Transit;
 import com.protomaps.basemap.layers.Water;
 import com.protomaps.basemap.text.FontRegistry;
+import java.io.IOException;
 import java.nio.file.Path;
 import java.util.HashMap;
 import java.util.List;
@@ -25,7 +27,7 @@
 
 public class Basemap extends ForwardingProfile {
 
-  public Basemap(NaturalEarthDb naturalEarthDb, QrankDb qrankDb) {
+  public Basemap(NaturalEarthDb naturalEarthDb, QrankDb qrankDb, CountryCoder countryCoder) {
 
     var admin = new Boundaries();
     registerHandler(admin);
@@ -52,7 +54,7 @@ public Basemap(NaturalEarthDb naturalEarthDb, QrankDb qrankDb) {
     registerHandler(poi);
     registerSourceHandler("osm", poi::processOsm);
 
-    var roads = new Roads();
+    var roads = new Roads(countryCoder);
     registerHandler(roads);
     registerSourceHandler("osm", roads::processOsm);
 
@@ -116,11 +118,11 @@ public Map<String, String> extraArchiveMetadata() {
     return result;
   }
 
-  public static void main(String[] args) {
+  public static void main(String[] args) throws IOException {
     run(Arguments.fromArgsOrConfigFile(args));
   }
 
-  static void run(Arguments args) {
+  static void run(Arguments args) throws IOException {
     args = args.orElse(Arguments.of("maxzoom", 15));
 
     Path dataDir = Path.of("data");
@@ -129,6 +131,8 @@ static void run(Arguments args) {
     Path nePath = sourcesDir.resolve("natural_earth_vector.sqlite.zip");
     String neUrl = "https://naciscdn.org/naturalearth/packages/natural_earth_vector.sqlite.zip";
 
+    var countryCoder = CountryCoder.fromJarResource();
+
     String area = args.getString("area", "geofabrik area to download", "monaco");
 
     var planetiler = Planetiler.create(args)
@@ -157,7 +161,7 @@ static void run(Arguments args) {
 
     fontRegistry.loadFontBundle("NotoSansDevanagari-Regular", "1", "Devanagari");
 
-    planetiler.setProfile(new Basemap(naturalEarthDb, qrankDb)).setOutput(Path.of(area + ".pmtiles"))
+    planetiler.setProfile(new Basemap(naturalEarthDb, qrankDb, countryCoder)).setOutput(Path.of(area + ".pmtiles"))
       .run();
   }
 }

tiles/src/main/java/com/protomaps/basemap/feature/CountryCoder.java

@@ -0,0 +1,82 @@
+package com.protomaps.basemap.feature;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.onthegomap.planetiler.geo.GeoUtils;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import org.locationtech.jts.geom.*;
+import org.locationtech.jts.index.strtree.STRtree;
+
+public class CountryCoder {
+
+  public record Record(String country, String nameEn, MultiPolygon multiPolygon) {}
+
+  private STRtree tree;
+
+  public CountryCoder(STRtree tree) {
+    this.tree = tree;
+  }
+
+  public static CountryCoder fromJarResource() throws IOException {
+    InputStream inputStream = CountryCoder.class.getResourceAsStream("/borders.json");
+
+    String jsonContent = new String(inputStream.readAllBytes());
+    return fromJsonString(jsonContent);
+  }
+
+  public static CountryCoder fromJsonString(String s) throws IOException {
+    STRtree tree = new STRtree();
+
+    ObjectMapper mapper = new ObjectMapper();
+    JsonNode featureCollection = mapper.readTree(s);
+    ArrayNode features = (ArrayNode) featureCollection.get("features");
+    for (var feature : features) {
+      JsonNode properties = feature.get("properties");
+
+      List<Polygon> polygons = new ArrayList<>();
+
+      for (var polygon : feature.get("geometry").get("coordinates")) {
+        ArrayNode outerRingNode = (ArrayNode) polygon.get(0);
+        Coordinate[] outerRingCoordinates = parseCoordinates(outerRingNode);
+        LinearRing outerRing = GeoUtils.JTS_FACTORY.createLinearRing(outerRingCoordinates);
+
+        LinearRing[] innerRings = new LinearRing[polygon.size() - 1];
+        for (int j = 1; j < polygon.size(); j++) {
+          ArrayNode innerRingNode = (ArrayNode) polygon.get(j);
+          Coordinate[] innerRingCoordinates = parseCoordinates(innerRingNode);
+          innerRings[j - 1] = GeoUtils.JTS_FACTORY.createLinearRing(innerRingCoordinates);
+        }
+        polygons.add(GeoUtils.JTS_FACTORY.createPolygon(outerRing, innerRings));
+      }
+
+      MultiPolygon multiPolygon = GeoUtils.createMultiPolygon(polygons);
+      multiPolygon.getEnvelopeInternal();
+      tree.insert(multiPolygon.getEnvelopeInternal(),
+        new Record(properties.get("country").asText(), properties.get("nameEn").asText(), multiPolygon));
+    }
+    return new CountryCoder(tree);
+  }
+
+  private static Coordinate[] parseCoordinates(ArrayNode coordinateArray) {
+    Coordinate[] coordinates = new Coordinate[coordinateArray.size()];
+    for (int i = 0; i < coordinateArray.size(); i++) {
+      ArrayNode coordinate = (ArrayNode) coordinateArray.get(i);
+      double x = coordinate.get(0).asDouble();
+      double y = coordinate.get(1).asDouble();
+      coordinates[i] = new Coordinate(x, y);
+    }
+    return coordinates;
+  }
+
+  public Optional<String> getCountryCode(Point point) {
+    List<Record> results = tree.query(point.getEnvelopeInternal());
+    if (results.isEmpty())
+      return Optional.empty();
+    return Optional.of(results.getFirst().country);
+  }
+}

tiles/src/main/java/com/protomaps/basemap/layers/Roads.java

@@ -8,6 +8,7 @@
 import com.onthegomap.planetiler.VectorTile;
 import com.onthegomap.planetiler.geo.GeometryException;
 import com.onthegomap.planetiler.reader.SourceFeature;
+import com.protomaps.basemap.feature.CountryCoder;
 import com.protomaps.basemap.feature.FeatureId;
 import com.protomaps.basemap.locales.CartographicLocale;
 import com.protomaps.basemap.locales.US;
@@ -16,6 +17,12 @@
 
 public class Roads implements ForwardingProfile.LayerPostProcesser {
 
+  private CountryCoder countryCoder;
+
+  public Roads(CountryCoder countryCoder) {
+    this.countryCoder = countryCoder;
+  }
+
   @Override
   public String name() {
     return "roads";