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


    /**
     *   putAll  adds all key-value pairs from the given map
     */
    public void testPutAll() {
        ConcurrentNavigableMap empty = map0();
        ConcurrentNavigableMap map = map5();
        empty.putAll(map);
        assertEquals(5, empty.size());
        assertTrue(empty.containsKey(one));
        assertTrue(empty.containsKey(two));
        assertTrue(empty.containsKey(three));

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    /**
     *   putIfAbsent works when the given key is not present
     */
    public void testPutIfAbsent() {
        ConcurrentNavigableMap map = map5();
        map.putIfAbsent(six, "Z");
        assertTrue(map.containsKey(six));
    }

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    /**
     *   putIfAbsent does not add the pair if the key is already present
     */
    public void testPutIfAbsent2() {
        ConcurrentNavigableMap map = map5();
        assertEquals("A", map.putIfAbsent(one, "Z"));
    }

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    /**
     *   replace fails when the given key is not present
     */
    public void testReplace() {
        ConcurrentNavigableMap map = map5();
        assertNull(map.replace(six, "Z"));
        assertFalse(map.containsKey(six));
    }

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    /**
     *   replace succeeds if the key is already present
     */
    public void testReplace2() {
        ConcurrentNavigableMap map = map5();
        assertNotNull(map.replace(one, "Z"));
        assertEquals("Z", map.get(one));
    }

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    /**
     * replace value fails when the given key not mapped to expected value
     */
    public void testReplaceValue() {
        ConcurrentNavigableMap map = map5();
        assertEquals("A", map.get(one));
        assertFalse(map.replace(one, "Z", "Z"));
        assertEquals("A", map.get(one));
    }

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    /**
     * replace value succeeds when the given key mapped to expected value
     */
    public void testReplaceValue2() {
        ConcurrentNavigableMap map = map5();
        assertEquals("A", map.get(one));
        assertTrue(map.replace(one, "A", "Z"));
        assertEquals("Z", map.get(one));
    }

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    /**
     *   remove removes the correct key-value pair from the map
     */
    public void testRemove() {
        ConcurrentNavigableMap map = map5();
        map.remove(five);
        assertEquals(4, map.size());
        assertFalse(map.containsKey(five));
    }

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    /**
     * remove(key,value) removes only if pair present
     */
    public void testRemove2() {
        ConcurrentNavigableMap map = map5();
        assertTrue(map.containsKey(five));
        assertEquals("E", map.get(five));
        map.remove(five, "E");
        assertEquals(4, map.size());
        assertFalse(map.containsKey(five));
        map.remove(four, "A");
        assertEquals(4, map.size());
        assertTrue(map.containsKey(four));
    }

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    /**
     * lowerEntry returns preceding entry.
     */
    public void testLowerEntry() {
        ConcurrentNavigableMap map = map5();
        Map.Entry e1 = map.lowerEntry(three);
        assertEquals(two, e1.getKey());


        Map.Entry e2 = map.lowerEntry(six);
        assertEquals(five, e2.getKey());


        Map.Entry e3 = map.lowerEntry(one);
        assertNull(e3);


        Map.Entry e4 = map.lowerEntry(zero);
        assertNull(e4);
    }

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