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 testDescendingTailMapContents() {
        ConcurrentNavigableMap map = dmap5();
        SortedMap sm = map.tailMap(m2);
        assertFalse(sm.containsKey(m1));
        assertTrue(sm.containsKey(m2));
        assertTrue(sm.containsKey(m3));
        assertTrue(sm.containsKey(m4));
        assertTrue(sm.containsKey(m5));
        Iterator i = sm.keySet().iterator();
        Object k;
        k = (Integer)(i.next());
        assertEquals(m2, k);
        k = (Integer)(i.next());
        assertEquals(m3, k);
        k = (Integer)(i.next());
        assertEquals(m4, k);
        k = (Integer)(i.next());
        assertEquals(m5, k);
        assertFalse(i.hasNext());


        Iterator ei = sm.entrySet().iterator();
        Map.Entry e;
        e = (Map.Entry)(ei.next());
        assertEquals(m2, e.getKey());
        assertEquals("B", e.getValue());
        e = (Map.Entry)(ei.next());
        assertEquals(m3, e.getKey());
        assertEquals("C", e.getValue());
        e = (Map.Entry)(ei.next());
        assertEquals(m4, e.getKey());
        assertEquals("D", e.getValue());
        e = (Map.Entry)(ei.next());
        assertEquals(m5, e.getKey());
        assertEquals("E", e.getValue());
        assertFalse(i.hasNext());


        SortedMap ssm = sm.tailMap(m4);
        assertEquals(m4, ssm.firstKey());
        assertEquals(m5, ssm.lastKey());
        assertEquals("D", ssm.remove(m4));
        assertEquals(1, ssm.size());
        assertEquals(3, sm.size());
        assertEquals(4, map.size());
    }

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    /**
     * pollLastEntry returns entries in order
     */
    public void testPollLastEntry() {
        ConcurrentNavigableMap map = map5();
        Map.Entry e = map.pollLastEntry();
        assertEquals(five, e.getKey());
        assertEquals("E", e.getValue());
        e = map.pollLastEntry();
        assertEquals(four, e.getKey());
        map.put(five, "E");
        e = map.pollLastEntry();
        assertEquals(five, e.getKey());
        assertEquals("E", e.getValue());
        e = map.pollLastEntry();
        assertEquals(three, e.getKey());
        map.remove(two);
        e = map.pollLastEntry();
        assertEquals(one, e.getKey());
        try {
            e.setValue("E");
            shouldThrow();
        } catch (UnsupportedOperationException success) {}
        e = map.pollLastEntry();
        assertNull(e);
    }

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    /**
     * size returns the correct values
     */
    public void testSize() {
        ConcurrentNavigableMap map = map5();
        ConcurrentNavigableMap empty = map0();
        assertEquals(0, empty.size());
        assertEquals(5, map.size());
    }

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    /**
     * toString contains toString of elements
     */
    public void testToString() {
        ConcurrentNavigableMap map = map5();
        String s = map.toString();
        for (int i = 1; i <= 5; ++i) {
            assertTrue(s.contains(String.valueOf(i)));
        }
    }

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    /**
     * get(null) of nonempty map throws NPE
     */
    public void testGet_NullPointerException() {
        try {
            ConcurrentNavigableMap c = map5();
            c.get(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * containsKey(null) of nonempty map throws NPE
     */
    public void testContainsKey_NullPointerException() {
        try {
            ConcurrentNavigableMap c = map5();
            c.containsKey(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * containsValue(null) throws NPE
     */
    public void testContainsValue_NullPointerException() {
        try {
            ConcurrentNavigableMap c = map0();
            c.containsValue(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * put(null,x) throws NPE
     */
    public void testPut1_NullPointerException() {
        try {
            ConcurrentNavigableMap c = map5();
            c.put(null, "whatever");
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * putIfAbsent(null, x) throws NPE
     */
    public void testPutIfAbsent1_NullPointerException() {
        try {
            ConcurrentNavigableMap c = map5();
            c.putIfAbsent(null, "whatever");
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * replace(null, x) throws NPE
     */
    public void testReplace_NullPointerException() {
        try {
            ConcurrentNavigableMap c = map5();
            c.replace(null, "whatever");
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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