Examples of java.util.concurrent.ConcurrentNavigableMap

java.util.concurrent.ConcurrentNavigableMap
A {@link ConcurrentMap} supporting {@link NavigableMap} operations,and recursively so for its navigable sub-maps.
This interface is a member of the Java Collections Framework. @author Doug Lea @param < K> the type of keys maintained by this map @param < V> the type of mapped values @since 1.6


    /**
     * headMap returns map with keys in requested range
     */
    public void testHeadMapContents() {
        ConcurrentNavigableMap map = map5();
        SortedMap sm = map.headMap(four);
        assertTrue(sm.containsKey(one));
        assertTrue(sm.containsKey(two));
        assertTrue(sm.containsKey(three));
        assertFalse(sm.containsKey(four));
        assertFalse(sm.containsKey(five));
        Iterator i = sm.keySet().iterator();
        Object k;
        k = (Integer)(i.next());
        assertEquals(one, k);
        k = (Integer)(i.next());
        assertEquals(two, k);
        k = (Integer)(i.next());
        assertEquals(three, k);
        assertFalse(i.hasNext());
        sm.clear();
        assertTrue(sm.isEmpty());
        assertEquals(2, map.size());
        assertEquals(four, map.firstKey());
    }

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    /**
     * headMap returns map with keys in requested range
     */
    public void testTailMapContents() {
        ConcurrentNavigableMap map = map5();
        SortedMap sm = map.tailMap(two);
        assertFalse(sm.containsKey(one));
        assertTrue(sm.containsKey(two));
        assertTrue(sm.containsKey(three));
        assertTrue(sm.containsKey(four));
        assertTrue(sm.containsKey(five));
        Iterator i = sm.keySet().iterator();
        Object k;
        k = (Integer)(i.next());
        assertEquals(two, k);
        k = (Integer)(i.next());
        assertEquals(three, k);
        k = (Integer)(i.next());
        assertEquals(four, k);
        k = (Integer)(i.next());
        assertEquals(five, k);
        assertFalse(i.hasNext());


        Iterator ei = sm.entrySet().iterator();
        Map.Entry e;
        e = (Map.Entry)(ei.next());
        assertEquals(two, e.getKey());
        assertEquals("B", e.getValue());
        e = (Map.Entry)(ei.next());
        assertEquals(three, e.getKey());
        assertEquals("C", e.getValue());
        e = (Map.Entry)(ei.next());
        assertEquals(four, e.getKey());
        assertEquals("D", e.getValue());
        e = (Map.Entry)(ei.next());
        assertEquals(five, e.getKey());
        assertEquals("E", e.getValue());
        assertFalse(i.hasNext());


        SortedMap ssm = sm.tailMap(four);
        assertEquals(four, ssm.firstKey());
        assertEquals(five, ssm.lastKey());
        assertEquals("D", ssm.remove(four));
        assertEquals(1, ssm.size());
        assertEquals(3, sm.size());
        assertEquals(4, map.size());
    }

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    /**
     *  clear removes all pairs
     */
    public void testDescendingClear() {
        ConcurrentNavigableMap map = dmap5();
        map.clear();
        assertEquals(map.size(), 0);
    }

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    /**
     *  Maps with same contents are equal
     */
    public void testDescendingEquals() {
        ConcurrentNavigableMap map1 = dmap5();
        ConcurrentNavigableMap map2 = dmap5();
        assertEquals(map1, map2);
        assertEquals(map2, map1);
        map1.clear();
        assertFalse(map1.equals(map2));
        assertFalse(map2.equals(map1));
    }

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    /**
     *  containsKey returns true for contained key
     */
    public void testDescendingContainsKey() {
        ConcurrentNavigableMap map = dmap5();
        assertTrue(map.containsKey(m1));
        assertFalse(map.containsKey(zero));
    }

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    /**
     *  containsValue returns true for held values
     */
    public void testDescendingContainsValue() {
        ConcurrentNavigableMap map = dmap5();
        assertTrue(map.containsValue("A"));
        assertFalse(map.containsValue("Z"));
    }

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    /**
     *  get returns the correct element at the given key,
     *  or null if not present
     */
    public void testDescendingGet() {
        ConcurrentNavigableMap map = dmap5();
        assertEquals("A", (String)map.get(m1));
        ConcurrentNavigableMap empty = dmap0();
        assertNull(empty.get(m1));
    }

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    /**
     *  isEmpty is true of empty map and false for non-empty
     */
    public void testDescendingIsEmpty() {
        ConcurrentNavigableMap empty = dmap0();
        ConcurrentNavigableMap map = dmap5();
        assertTrue(empty.isEmpty());
        assertFalse(map.isEmpty());
    }

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    /**
     *   firstKey returns first key
     */
    public void testDescendingFirstKey() {
        ConcurrentNavigableMap map = dmap5();
        assertEquals(m1, map.firstKey());
    }

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    /**
     *   lastKey returns last key
     */
    public void testDescendingLastKey() {
        ConcurrentNavigableMap map = dmap5();
        assertEquals(m5, map.lastKey());
    }

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