Send the extra relations to next round

src/main/java/org/leolo/map/osm/extract/ExtractElement.java

@@ -205,7 +205,7 @@ public class ExtractElement {
             return;
     }
 
-    private void expandRelations(InputFile dbFile, int round) throws IOException{
+    private void expandRelations(InputFile dbFile,final int round) throws IOException{
         if(pendingRelations.isEmpty()) {
             log.atInfo().log("No relation to be expanded");
             return;
@@ -255,6 +255,11 @@ public class ExtractElement {
         } catch (OsmInputException e) {
             log.atError().withThrowable(e).log("Error when reading the input!");
         }
+        log.atInfo().log("There are {} relations to be expanded in next round", nextRound.size());
+        pendingRelations = nextRound;
+        if(pendingRelations.size()>0){
+            expandRelations(dbFile, round+1);
+        }
     }
 
     private void printHelp(int returnValue){