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From "spark shen (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-1026) [classlib][luni] java.util.TreeMap.headMap(Object) method does not return empty SortedMap
Date Tue, 01 Aug 2006 08:27:13 GMT
[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


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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