Github user ajs6f commented on a diff in the pull request:

    https://github.com/apache/jena/pull/123#discussion_r50538211
  
    --- Diff: 
jena-text/src/main/java/org/apache/jena/query/text/TextIndexLucene.java ---
    @@ -399,4 +404,24 @@ private Node entryToNode(String v) {
             // TEMP
             return NodeFactoryExtra.createLiteralNode(v, null, null) ;
         }
    +    
    +    
    +    // set up event handlers
    +    
    +    public enum Event { CLOSED };
    +    
    +    public static interface EventHandler {
    +           void handle(TextIndexLucene index);
    +    }
    +    
    +    private Map<Event, List<EventHandler>> eventHandlers = new 
HashMap<Event, List<EventHandler>>();
    --- End diff --
    
    You can use just `new HashMap<>()` here.


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