add extraMetadata to profile interface [#794] (#795)

planetiler-core/src/main/java/com/onthegomap/planetiler/Profile.java

@@ -7,6 +7,7 @@ import com.onthegomap.planetiler.reader.osm.OsmElement;
 import com.onthegomap.planetiler.reader.osm.OsmRelationInfo;
 import com.onthegomap.planetiler.util.Wikidata;
 import java.util.List;
+import java.util.Map;
 import java.util.function.Consumer;
 
 /**
@@ -157,6 +158,8 @@ public interface Profile {
     return false;
   }
 
+  default Map<String,String> extraArchiveMetadata() { return Map.of(); }
+
   /**
    * Defines whether {@link Wikidata} should fetch wikidata translations for the input element.
    * <p>

planetiler-core/src/main/java/com/onthegomap/planetiler/archive/TileArchiveMetadata.java

@@ -17,6 +17,7 @@ import com.onthegomap.planetiler.util.LayerAttrStats;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.TreeMap;
 import org.locationtech.jts.geom.Coordinate;
 import org.locationtech.jts.geom.Envelope;
 import org.slf4j.Logger;
@@ -93,7 +94,7 @@ public record TileArchiveMetadata(
       config.minzoom(),
       config.maxzoom(),
       vectorLayers == null ? null : new TileArchiveMetadataJson(vectorLayers),
-      mapWithBuildInfo(),
+      mergeMaps(mapWithBuildInfo(),profile.extraArchiveMetadata()),
       config.tileCompression()
     );
   }
@@ -175,6 +176,12 @@ public record TileArchiveMetadata(
    * https://github.com/FasterXML/jackson-databind/issues/3439
    */
 
+  private static Map<String,String> mergeMaps(Map<String,String> m1, Map<String,String> m2) {
+    var result = new TreeMap<>(m1);
+    result.putAll(m2);
+    return result;
+  }
+
   @JsonAnySetter
   private void putUnknownFieldsToOthers(String name, String value) {
     others.put(name, value);

planetiler-core/src/test/java/com/onthegomap/planetiler/archive/TileArchiveMetadataTest.java

@@ -6,11 +6,14 @@ import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonMappingException;
 import com.fasterxml.jackson.databind.json.JsonMapper;
 import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.onthegomap.planetiler.FeatureCollector;
 import com.onthegomap.planetiler.Profile;
 import com.onthegomap.planetiler.TestUtils;
+import com.onthegomap.planetiler.VectorTile;
 import com.onthegomap.planetiler.config.Arguments;
 import com.onthegomap.planetiler.config.PlanetilerConfig;
 import com.onthegomap.planetiler.geo.GeoUtils;
+import com.onthegomap.planetiler.reader.SourceFeature;
 import com.onthegomap.planetiler.util.LayerAttrStats;
 import java.util.List;
 import java.util.Map;
@@ -191,6 +194,30 @@ class TileArchiveMetadataTest {
     assertEquals(7, Math.ceil(metadata.zoom()));
   }
 
+  @Test
+  void testAddExtraMetadata() {
+    class TestingProfile extends Profile.NullProfile  {
+
+      @Override
+      public String name() {
+        return "My Name";
+      }
+
+      @Override
+      public Map<String,String> extraArchiveMetadata() {
+        return Map.of("FooVersion","2.0");
+      }
+    }
+
+    var metadata = new TileArchiveMetadata(new TestingProfile(), PlanetilerConfig.from(Arguments.of(Map.of(
+      "bounds", "-73.6632,41.1274,-69.7598,43.0185"
+    ))));
+
+    var map = new TreeMap<>(metadata.toMap());
+    assertEquals("My Name", map.get("name"));
+    assertEquals("2.0", map.get("FooVersion"));
+  }
+
   @Test
   void testToMap() throws JsonProcessingException {
     var bounds = "-73.6632,41.1274,-69.7598,43.0185";