add getDistanceFilter() since you need that in order to sort by the exact distances (previously distanceFilter attr was public)

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@801471 13f79535-47bb-0310-9956-ffa450edef68

contrib/spatial/src/java/org/apache/lucene/spatial/tier/DistanceQueryBuilder.java

@@ -116,6 +116,10 @@ public class DistanceQueryBuilder {
     return new ChainedFilter(new Filter[] {qf, filter},
                              ChainedFilter.AND);
   }
+
+  public DistanceFilter getDistanceFilter() {
+    return distanceFilter;
+  }
     
   public Query getQuery(Query query){
     return new ConstantScoreQuery(getFilter(query));