use languages from database as default

When starting Photon without the language parameter, the languages
that were originally configured with the database should be used.

Fixes #691.

Author: lonvia

src/main/java/de/komoot/photon/App.java

@@ -144,7 +144,7 @@ private static void startApi(CommandLineArgs args, Server server) {
         // Get database properties and ensure that the version is compatible.
         DatabaseProperties dbProperties = new DatabaseProperties();
         server.loadFromDatabase(dbProperties);
-        if (args.getLanguages().length > 0) {
+        if (args.getLanguages(false).length > 0) {
             dbProperties.restrictLanguages(args.getLanguages());
         }
 

src/main/java/de/komoot/photon/CommandLineArgs.java

@@ -27,7 +27,7 @@ public class CommandLineArgs {
     private boolean nominatimUpdate = false;
 
     @Parameter(names = "-languages", description = "languages nominatim importer should import and use at run-time, comma separated (default is 'en,fr,de,it')", converter = StringArrayConverter.class)
-    private String[] languages = new String[]{"en", "de", "fr", "it"};
+    private String[] languages = new String[]{};
 
     @Parameter(names = "-default-language", description = "language to return results in when no explicit language is choosen by the user")
     private String defaultLanguage = "default";
@@ -79,5 +79,17 @@ public class CommandLineArgs {
 
     @Parameter(names = "-h", description = "show help / usage")
     private boolean usage = false;
+
+    public String[] getLanguages(boolean useDefaultIfEmpty) {
+        if (useDefaultIfEmpty && languages.length == 0) {
+            return new String[]{"en", "de", "fr", "it"};
+        }
+
+        return languages;
+    }
+
+    public String[] getLanguages() {
+        return getLanguages(true);
+    }
 }
 

src/test/java/de/komoot/photon/api/ApiLanguagesTest.java

@@ -0,0 +1,119 @@
+package de.komoot.photon.api;
+
+import com.vividsolutions.jts.geom.Coordinate;
+import com.vividsolutions.jts.geom.Point;
+
+import de.komoot.photon.App;
+import de.komoot.photon.ESBaseTester;
+import de.komoot.photon.Importer;
+import de.komoot.photon.PhotonDoc;
+import org.json.JSONArray;
+import org.json.JSONObject;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.*;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static spark.Spark.*;
+
+public class ApiLanguagesTest extends ESBaseTester {
+
+    private static final int LISTEN_PORT = 30234;
+
+    @AfterEach
+    public void shutdown() {
+        stop();
+        awaitStop();
+    }
+
+    protected PhotonDoc createDoc(int id, String key, String value, String... names) {
+        Point location = FACTORY.createPoint(new Coordinate(1.0, 2.34));
+        PhotonDoc doc = new PhotonDoc(id, "W", id, key, value).centroid(location);
+
+        Map<String, String> nameMap = new HashMap<>();
+
+        for (int i = 0; i < names.length - 1; i += 2) {
+            nameMap.put(names[i], names[i + 1]);
+        }
+
+        doc.names(nameMap);
+
+        return doc;
+    }
+
+    private void importPlaces(String... languages) throws Exception {
+        setUpES(dataDirectory, languages);
+        Importer instance = makeImporterWithLanguages(languages);
+        instance.add(createDoc(1000, "place", "city",
+                "name:en", "thething", "name:fr", "letruc", "name:ch", "dasding"));
+        instance.add(createDoc(1001, "place", "town",
+                "name:ch", "thething", "name:fr", "letruc", "name:en", "dasding"));
+        instance.finish();
+        refresh();
+    }
+
+    private void startAPI(String languages) throws Exception {
+        List<String> params = new ArrayList<>(Arrays.asList("-cluster", TEST_CLUSTER_NAME,
+                "-listen-port", Integer.toString(LISTEN_PORT),
+                "-transport-addresses", "127.0.0.1",
+                "-cors-any"));
+
+        if (languages.length() > 0) {
+            params.add("-languages");
+            params.add(languages);
+        }
+
+        App.main(params.toArray(new String[0]));
+        awaitInitialization();
+    }
+
+    private JSONArray query(String q) throws Exception {
+        HttpURLConnection connection =
+                (HttpURLConnection) new URL("http://127.0.0.1:" + port() + "/api?" + q).openConnection();
+        JSONObject json = new JSONObject(
+                new BufferedReader(new InputStreamReader(connection.getInputStream())).lines().collect(Collectors.joining("\n")));
+
+        return json.getJSONArray("features");
+    }
+
+    private int getOsmId(JSONArray results, int idx) {
+        return results.getJSONObject(idx).getJSONObject("properties").getInt("osm_id");
+    }
+
+    @Test
+    public void testOnlyImportSelectedLanguages() throws Exception {
+        importPlaces("en");
+        startAPI("");
+
+        JSONArray results = query("q=thething");
+        assertEquals(1, results.length());
+        assertEquals(1000, getOsmId(results, 0));
+
+        assertEquals(0, query("q=letruc").length());
+    }
+
+    @Test
+    public void testUseImportLanguagesWhenNoOtherIsGiven() throws Exception {
+        importPlaces("en", "fr", "ch");
+        startAPI("");
+
+        JSONArray results = query("q=thething");
+        assertEquals(2, results.length());
+    }
+
+    @Test
+    public void testUseCommandLineLangauges() throws Exception {
+        importPlaces("en", "fr", "ch");
+        startAPI("en,fr");
+
+        JSONArray results = query("q=thething");
+        assertEquals(1, results.length());
+    }
+
+}