add getFilter(), LUCENE-440

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@331113 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/search/FilteredQuery.java

@@ -55,6 +55,8 @@ extends Query {
     this.filter = filter;
   }
 
+
+
   /**
    * Returns a Weight that applies the filter to the enclosed query's Weight.
    * This is accomplished by overriding the Scorer returned by the Weight.
@@ -120,6 +122,10 @@ extends Query {
     return query;
   }
 
+  public Filter getFilter() {
+    return filter;
+  }
+
   // inherit javadoc
   public void extractTerms(Set terms) {
       getQuery().extractTerms(terms);