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From "spark shen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-1026) [classlib][luni] java.util.TreeMap.headMap(Object) method does not return empty SortedMap
Date Wed, 02 Aug 2006 05:46:16 GMT
    [ http://issues.apache.org/jira/browse/HARMONY-1026?page=comments#action_12425142 ] 
            
spark shen commented on HARMONY-1026:
-------------------------------------

OK. I will create another JIRA on TreeMap.

Best regards,
Spark Shen

> [classlib][luni] java.util.TreeMap.headMap(Object) method does not return empty SortedMap
> -----------------------------------------------------------------------------------------
>
>                 Key: HARMONY-1026
>                 URL: http://issues.apache.org/jira/browse/HARMONY-1026
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>            Reporter: spark shen
>         Assigned To: Paulex Yang
>         Attachments: harmony-1026.diff
>
>
> java.util.TreeMap.headMap(Object) method does not return
> empty SortedMap when the specified object is null and the tree map uses a
> null-tolerable comparator.
> The following test case gives a hint.
> public static class MockComparator<T> implements Comparator<T> {
>         
>         public int compare(T o1, T o2) {
>             if(null == o1) return -1;
>             if(o1.equals(o2)) {
>                 return 0;
>             }
>             return 1;
>         }
>         
> }
> public void test_headMapLjava_lang_Object() {
>         TreeMap<Integer, Double> map = new TreeMap<Integer, Double>(
>                 new MockComparator<Integer>());
>         map.put(1, 2.1);
>         map.put(2, 3.1);
>         map.put(3, 4.5);
>         map.put(7, 21.3);
>         SortedMap<Integer, Double> smap = map.headMap(null);
>         assertEquals(0, smap.size());
>         Set<Integer> keySet = smap.keySet();
>         assertEquals(0, keySet.size());
>         Set<Map.Entry<Integer, Double>> entrySet = smap.entrySet();
>         assertEquals(0, entrySet.size());
> }
> I will attach a patch to fix this problem.
> Best regards,
> Spark Shen

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