6691185: (coll) TreeMap.navigableKeySet's descendingIterator method starts at...

6691185: (coll) TreeMap.navigableKeySet's descendingIterator method starts at first instead of last entry
Reviewed-by: dl, chegar

src/share/classes/java/util/TreeMap.java

 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1021,7 +1021,7 @@ public class TreeMap<K,V>
     }
 
     Iterator<K> descendingKeyIterator() {
-        return new DescendingKeyIterator(getFirstEntry());
+        return new DescendingKeyIterator(getLastEntry());
     }
 
     static final class KeySet<E> extends AbstractSet<E> implements NavigableSet<E> {

test/java/util/Collection/MOAT.java

 /*
- * Copyright 2005-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2005-2008 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,7 +25,7 @@
  * @test
  * @bug     6207984 6272521 6192552 6269713 6197726 6260652 5073546 4137464
  *          4155650 4216399 4294891 6282555 6318622 6355327 6383475 6420753
- *          6431845 4802633 6570566 6570575 6570631 6570924
+ *          6431845 4802633 6570566 6570575 6570631 6570924 6691185
  * @summary Run many tests on many Collection and Map implementations
  * @author  Martin Buchholz
  */
@@ -155,7 +155,7 @@ public class MOAT {
         check(c.containsAll(new ArrayList<Integer>()));
     }
 
-    private static void testEmptyCollection(Collection<?> c) {
+    private static <T> void testEmptyCollection(Collection<T> c) {
         check(c.isEmpty());
         equal(c.size(), 0);
         equal(c.toString(),"[]");
@@ -165,6 +165,23 @@ public class MOAT {
         Object[] a = new Object[1]; a[0] = Boolean.TRUE;
         equal(c.toArray(a), a);
         equal(a[0], null);
+        testEmptyIterator(c.iterator());
+    }
+
+    static <T> void testEmptyIterator(final Iterator<T> it) {
+        if (rnd.nextBoolean())
+            check(! it.hasNext());
+
+        THROWS(NoSuchElementException.class,
+               new Fun(){void f(){ it.next(); }});
+
+        try { it.remove(); }
+        catch (IllegalStateException _) { pass(); }
+        catch (UnsupportedOperationException _) { pass(); }
+        catch (Throwable t) { unexpected(t); }
+
+        if (rnd.nextBoolean())
+            check(! it.hasNext());
     }
 
     private static void testEmptyList(List<?> c) {
@@ -173,10 +190,12 @@ public class MOAT {
         equal2(c, Collections.<Integer>emptyList());
     }
 
-    private static void testEmptySet(Set<?> c) {
+    private static <T> void testEmptySet(Set<T> c) {
         testEmptyCollection(c);
         equal(c.hashCode(), 0);
         equal2(c, Collections.<Integer>emptySet());
+        if (c instanceof NavigableSet<?>)
+            testEmptyIterator(((NavigableSet<T>)c).descendingIterator());
     }
 
     private static void testImmutableCollection(final Collection<Integer> c) {
@@ -221,7 +240,7 @@ public class MOAT {
         testEmptyCollection(c);
     }
 
-    private static void testEmptyMap(final Map<?,?> m) {
+    private static <K,V> void testEmptyMap(final Map<K,V> m) {
         check(m.isEmpty());
         equal(m.size(), 0);
         equal(m.toString(),"{}");
@@ -433,8 +452,18 @@ public class MOAT {
         if (! supportsAdd(c)) return;
         //System.out.println("add() supported");
 
-        if (c instanceof NavigableSet)
-            testNavigableSet((NavigableSet<Integer>)c);
+        if (c instanceof NavigableSet) {
+            System.out.println("NavigableSet tests...");
+
+            NavigableSet<Integer> ns = (NavigableSet<Integer>)c;
+            testNavigableSet(ns);
+            testNavigableSet(ns.headSet(6, false));
+            testNavigableSet(ns.headSet(5, true));
+            testNavigableSet(ns.tailSet(0, false));
+            testNavigableSet(ns.tailSet(1, true));
+            testNavigableSet(ns.subSet(0, false, 5, true));
+            testNavigableSet(ns.subSet(1, true, 6, false));
+        }
 
         if (c instanceof Queue)
             testQueue((Queue<Integer>)c);
@@ -514,8 +543,19 @@ public class MOAT {
         if (m instanceof ConcurrentMap)
             testConcurrentMap((ConcurrentMap<Integer,Integer>) m);
 
-        if (m instanceof NavigableMap)
-            testNavigableMap((NavigableMap<Integer,Integer>) m);
+        if (m instanceof NavigableMap) {
+            System.out.println("NavigableMap tests...");
+
+            NavigableMap<Integer,Integer> nm =
+                (NavigableMap<Integer,Integer>) m;
+            testNavigableMap(nm);
+            testNavigableMap(nm.headMap(6, false));
+            testNavigableMap(nm.headMap(5, true));
+            testNavigableMap(nm.tailMap(0, false));
+            testNavigableMap(nm.tailMap(1, true));
+            testNavigableMap(nm.subMap(1, true, 6, false));
+            testNavigableMap(nm.subMap(0, false, 5, true));
+        }
 
         checkFunctionalInvariants(m);
 
@@ -697,8 +737,6 @@ public class MOAT {
 
     private static void testNavigableMap(NavigableMap<Integer,Integer> m)
     {
-        System.out.println("NavigableMap tests...");
-
         clear(m);
         checkNavigableMapKeys(m, 1, null, null, null, null);
 
@@ -717,9 +755,11 @@ public class MOAT {
         checkNavigableMapKeys(m, 5,    3,    5,    5, null);
         checkNavigableMapKeys(m, 6,    5,    5, null, null);
 
-        {
-            final Iterator<Integer> it
-                = m.descendingKeySet().iterator();
+        for (final Iterator<Integer> it :
+                 (Iterator<Integer>[])
+                 new Iterator<?>[] {
+                     m.descendingKeySet().iterator(),
+                     m.navigableKeySet().descendingIterator()}) {
             equalNext(it, 5);
             equalNext(it, 3);
             equalNext(it, 1);
@@ -742,8 +782,6 @@ public class MOAT {
 
 
     private static void testNavigableSet(NavigableSet<Integer> s) {
-        System.out.println("NavigableSet tests...");
-
         clear(s);
         checkNavigableSetKeys(s, 1, null, null, null, null);
 
@@ -762,8 +800,11 @@ public class MOAT {
         checkNavigableSetKeys(s, 5,    3,    5,    5, null);
         checkNavigableSetKeys(s, 6,    5,    5, null, null);
 
-        {
-            final Iterator<Integer> it = s.descendingIterator();
+        for (final Iterator<Integer> it :
+                 (Iterator<Integer>[])
+                 new Iterator<?>[] {
+                     s.descendingIterator(),
+                     s.descendingSet().iterator()}) {
             equalNext(it, 5);
             equalNext(it, 3);
             equalNext(it, 1);

test/java/util/NavigableMap/LockStep.java

 /*
- * Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2006-2008 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -23,7 +23,7 @@
 
 /*
  * @test
- * @bug     6420753 6242436
+ * @bug     6420753 6242436 6691185
  * @summary Compare NavigableMap implementations for identical behavior
  * @author  Martin Buchholz
  */
@@ -159,6 +159,7 @@ public class LockStep {
         Object[] a = new Object[1]; a[0] = Boolean.TRUE;
         equal(c.toArray(a), a);
         equal(a[0], null);
+        check(! c.iterator().hasNext());
     }
 
     static void testEmptySet(Set<?> c) {
@@ -262,6 +263,16 @@ public class LockStep {
         }
     }
 
+    static void equalIterators(final Iterator<?> it1,
+                               final Iterator<?> it2) {
+        while (it1.hasNext()) {
+            if (maybe(2))
+                check(it2.hasNext());
+            equal(it1.next(), it2.next());
+        }
+        check(! it2.hasNext());
+    }
+
     static void equalNavigableSetsLeaf(final NavigableSet s1,
                                        final NavigableSet s2) {
         equal2(s1,            s2);
@@ -273,6 +284,8 @@ public class LockStep {
             equal(s1.first(), s2.first());
             equal(s1.last(),  s2.last());
         }
+        equalIterators(s1.iterator(), s2.iterator());
+        equalIterators(s1.descendingIterator(), s2.descendingIterator());
         checkNavigableSet(s1);
         checkNavigableSet(s2);
     }
@@ -493,30 +506,23 @@ public class LockStep {
 
     static MapFrobber randomAdder(NavigableMap m) {
         final Integer k = unusedKey(m);
-        MapFrobber f;
-        switch (rnd.nextInt(4)) {
-        case 0: f = new MapFrobber() {void frob(NavigableMap m) {
-            equal(m.put(k, k+1), null);
-            equal(m.get(k), k+1);
-            if (maybe(4)) {
-                equal(m.put(k, k+1), k+1);
-                equal(m.get(k), k+1);}}};
-            break;
-        case 1: f = new MapFrobber() {void frob(NavigableMap m) {
-            m.descendingMap().put(k, k+1);
-            equal(m.get(k), k+1);}};
-            break;
-        case 2: f = new MapFrobber() {void frob(NavigableMap m) {
-            m.tailMap(k,true).headMap(k,true).put(k,k+1);}};
-            break;
-        case 3: f = new MapFrobber() {void frob(NavigableMap m) {
-            m.tailMap(k,true).headMap(k,true).descendingMap().put(k,k+1);}};
-            break;
-        default: throw new Error();
-        }
-        final MapFrobber ff = f;
+        final MapFrobber[] randomAdders = {
+            new MapFrobber() {void frob(NavigableMap m) {
+                equal(m.put(k, k+1), null);
+                equal(m.get(k), k+1);
+                if (maybe(4)) {
+                    equal(m.put(k, k+1), k+1);
+                    equal(m.get(k), k+1);}}},
+            new MapFrobber() {void frob(NavigableMap m) {
+                m.descendingMap().put(k, k+1);
+                equal(m.get(k), k+1);}},
+            new MapFrobber() {void frob(NavigableMap m) {
+                m.tailMap(k,true).headMap(k,true).put(k,k+1);}},
+            new MapFrobber() {void frob(NavigableMap m) {
+                m.tailMap(k,true).headMap(k,true).descendingMap().put(k,k+1);}}
+        };
         return new MapFrobber() {void frob(NavigableMap m) {
-            ff.frob(m);
+            randomAdders[rnd.nextInt(randomAdders.length)].frob(m);
             if (maybe(2)) equal(m.get(k), k+1);
             if (maybe(4)) {
                 equal(m.put(k, k+1), k+1);
@@ -525,26 +531,19 @@ public class LockStep {
 
     static SetFrobber randomAdder(NavigableSet s) {
         final Integer e = unusedElt(s);
-        SetFrobber f;
-        switch (rnd.nextInt(4)) {
-        case 0: f = new SetFrobber() {void frob(NavigableSet s) {
-            check(s.add(e));}};
-            break;
-        case 1: f = new SetFrobber() {void frob(NavigableSet s) {
-            s.descendingSet().add(e);}};
-            break;
-        case 2: f = new SetFrobber() {void frob(NavigableSet s) {
-            s.tailSet(e,true).headSet(e,true).add(e);}};
-            break;
-        case 3: f = new SetFrobber() {void frob(NavigableSet s) {
-            s.descendingSet().tailSet(e,true).headSet(e,true).add(e);}};
-            break;
-        default: throw new Error();
-        }
-        final SetFrobber ff = f;
+        final SetFrobber[] randomAdders = {
+            new SetFrobber() {void frob(NavigableSet s) {
+                check(s.add(e));}},
+            new SetFrobber() {void frob(NavigableSet s) {
+                s.descendingSet().add(e);}},
+            new SetFrobber() {void frob(NavigableSet s) {
+                s.tailSet(e,true).headSet(e,true).add(e);}},
+            new SetFrobber() {void frob(NavigableSet s) {
+                s.descendingSet().tailSet(e,true).headSet(e,true).add(e);}}
+        };
         return new SetFrobber() {void frob(NavigableSet s) {
             if (maybe(2)) check(! s.contains(e));
-            ff.frob(s);
+            randomAdders[rnd.nextInt(randomAdders.length)].frob(s);
             if (maybe(2)) check(! s.add(e));
             if (maybe(2)) check(s.contains(e));}};
     }
@@ -605,89 +604,112 @@ public class LockStep {
 
     static MapFrobber randomRemover(NavigableMap m) {
         final Integer k = usedKey(m);
-        switch (rnd.nextInt(7)) {
-        default: throw new Error();
-        case 0: return new MapFrobber() {void frob(NavigableMap m) {
-            Map.Entry e = m.firstEntry();
-            equal(m.pollFirstEntry(), e);
-            checkUnusedKey(m, e.getKey());}};
-        case 1: return new MapFrobber() {void frob(NavigableMap m) {
-            Map.Entry e = m.lastEntry();
-            equal(m.pollLastEntry(), e);
-            checkUnusedKey(m, e.getKey());}};
-        case 2: return new MapFrobber() {void frob(NavigableMap m) {
-            check(m.remove(k) != null);
-            checkUnusedKey(m, k);}};
-        case 3: return new MapFrobber() {void frob(NavigableMap m) {
-            m.subMap(k, true, k, true).clear();
-            checkUnusedKey(m, k);}};
-        case 4: return new MapFrobber() {void frob(NavigableMap m) {
-            m.descendingMap().subMap(k, true, k, true).clear();
-            checkUnusedKey(m, k);}};
-        case 5: return new MapFrobber() {void frob(NavigableMap m) {
-            final Iterator it = m.keySet().iterator();
-            while (it.hasNext())
-                if (it.next().equals(k)) {
-                    it.remove();
-                    if (maybe(2))
-                        THROWS(IllegalStateException.class,
-                               new Fun(){void f(){ it.remove(); }});
-                }
-            checkUnusedKey(m, k);}};
-        case 6: return new MapFrobber() {void frob(NavigableMap m) {
-            final Iterator<Map.Entry> it = m.entrySet().iterator();
-            while (it.hasNext())
-                if (it.next().getKey().equals(k)) {
-                    it.remove();
-                    if (maybe(2))
-                        THROWS(IllegalStateException.class, remover(it));
-                }
-            checkUnusedKey(m, k);}};
-        }
+        final MapFrobber[] randomRemovers = {
+            new MapFrobber() {void frob(NavigableMap m) {
+                Map.Entry e = m.firstEntry();
+                equal(m.pollFirstEntry(), e);
+                checkUnusedKey(m, e.getKey());}},
+            new MapFrobber() {void frob(NavigableMap m) {
+                Map.Entry e = m.lastEntry();
+                equal(m.pollLastEntry(), e);
+                checkUnusedKey(m, e.getKey());}},
+            new MapFrobber() {void frob(NavigableMap m) {
+                check(m.remove(k) != null);
+                checkUnusedKey(m, k);}},
+            new MapFrobber() {void frob(NavigableMap m) {
+                m.subMap(k, true, k, true).clear();
+                checkUnusedKey(m, k);}},
+            new MapFrobber() {void frob(NavigableMap m) {
+                m.descendingMap().subMap(k, true, k, true).clear();
+                checkUnusedKey(m, k);}},
+            new MapFrobber() {void frob(NavigableMap m) {
+                final Iterator it = m.keySet().iterator();
+                while (it.hasNext())
+                    if (it.next().equals(k)) {
+                        it.remove();
+                        if (maybe(2))
+                            THROWS(IllegalStateException.class,
+                                   new Fun(){void f(){ it.remove(); }});
+                    }
+                checkUnusedKey(m, k);}},
+            new MapFrobber() {void frob(NavigableMap m) {
+                final Iterator it = m.navigableKeySet().descendingIterator();
+                while (it.hasNext())
+                    if (it.next().equals(k)) {
+                        it.remove();
+                        if (maybe(2))
+                            THROWS(IllegalStateException.class,
+                                   new Fun(){void f(){ it.remove(); }});
+                    }
+                checkUnusedKey(m, k);}},
+            new MapFrobber() {void frob(NavigableMap m) {
+                final Iterator<Map.Entry> it = m.entrySet().iterator();
+                while (it.hasNext())
+                    if (it.next().getKey().equals(k)) {
+                        it.remove();
+                        if (maybe(2))
+                            THROWS(IllegalStateException.class, remover(it));
+                    }
+                checkUnusedKey(m, k);}},
+        };
+
+        return randomRemovers[rnd.nextInt(randomRemovers.length)];
     }
 
     static SetFrobber randomRemover(NavigableSet s) {
         final Integer e = usedElt(s);
-        switch (rnd.nextInt(7)) {
-        default: throw new Error();
-        case 0: return new SetFrobber() {void frob(NavigableSet s) {
-            Object e = s.first();
-            equal(s.pollFirst(), e);
-            checkUnusedElt(s, e);}};
-        case 1: return new SetFrobber() {void frob(NavigableSet s) {
-            Object e = s.last();
-            equal(s.pollLast(), e);
-            checkUnusedElt(s, e);}};
-        case 2: return new SetFrobber() {void frob(NavigableSet s) {
-            check(s.remove(e));
-            checkUnusedElt(s, e);}};
-        case 3: return new SetFrobber() {void frob(NavigableSet s) {
-            s.subSet(e, true, e, true).clear();
-            checkUnusedElt(s, e);}};
-        case 4: return new SetFrobber() {void frob(NavigableSet s) {
-            s.descendingSet().subSet(e, true, e, true).clear();
-            checkUnusedElt(s, e);}};
-        case 5: return new SetFrobber() {void frob(NavigableSet s) {
-            final Iterator it = s.iterator();
-            while (it.hasNext())
-                if (it.next().equals(e)) {
-                    it.remove();
-                    if (maybe(2))
-                        THROWS(IllegalStateException.class,
-                               new Fun(){void f(){ it.remove(); }});
-                }
-            checkUnusedElt(s, e);}};
-        case 6: return new SetFrobber() {void frob(NavigableSet s) {
-            final Iterator it = s.descendingSet().iterator();
-            while (it.hasNext())
-                if (it.next().equals(e)) {
-                    it.remove();
-                    if (maybe(2))
-                        THROWS(IllegalStateException.class,
-                               new Fun(){void f(){ it.remove(); }});
-                }
-            checkUnusedElt(s, e);}};
-        }
+
+        final SetFrobber[] randomRemovers = {
+            new SetFrobber() {void frob(NavigableSet s) {
+                Object e = s.first();
+                equal(s.pollFirst(), e);
+                checkUnusedElt(s, e);}},
+            new SetFrobber() {void frob(NavigableSet s) {
+                Object e = s.last();
+                equal(s.pollLast(), e);
+                checkUnusedElt(s, e);}},
+            new SetFrobber() {void frob(NavigableSet s) {
+                check(s.remove(e));
+                checkUnusedElt(s, e);}},
+            new SetFrobber() {void frob(NavigableSet s) {
+                s.subSet(e, true, e, true).clear();
+                checkUnusedElt(s, e);}},
+            new SetFrobber() {void frob(NavigableSet s) {
+                s.descendingSet().subSet(e, true, e, true).clear();
+                checkUnusedElt(s, e);}},
+            new SetFrobber() {void frob(NavigableSet s) {
+                final Iterator it = s.iterator();
+                while (it.hasNext())
+                    if (it.next().equals(e)) {
+                        it.remove();
+                        if (maybe(2))
+                            THROWS(IllegalStateException.class,
+                                   new Fun(){void f(){ it.remove(); }});
+                    }
+                checkUnusedElt(s, e);}},
+            new SetFrobber() {void frob(NavigableSet s) {
+                final Iterator it = s.descendingSet().iterator();
+                while (it.hasNext())
+                    if (it.next().equals(e)) {
+                        it.remove();
+                        if (maybe(2))
+                            THROWS(IllegalStateException.class,
+                                   new Fun(){void f(){ it.remove(); }});
+                    }
+                checkUnusedElt(s, e);}},
+            new SetFrobber() {void frob(NavigableSet s) {
+                final Iterator it = s.descendingIterator();
+                while (it.hasNext())
+                    if (it.next().equals(e)) {
+                        it.remove();
+                        if (maybe(2))
+                            THROWS(IllegalStateException.class,
+                                   new Fun(){void f(){ it.remove(); }});
+                    }
+                checkUnusedElt(s, e);}}
+        };
+
+        return randomRemovers[rnd.nextInt(randomRemovers.length)];
     }
 
     static void lockStep(NavigableMap m1,