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


    /**
     * higherEntry returns next entry.
     */
    public void testDescendingHigherEntry() {
        ConcurrentNavigableMap map = dmap5();
        Map.Entry e1 = map.higherEntry(m3);
        assertEquals(m4, e1.getKey());


        Map.Entry e2 = map.higherEntry(zero);
        assertEquals(m1, e2.getKey());


        Map.Entry e3 = map.higherEntry(m5);
        assertNull(e3);


        Map.Entry e4 = map.higherEntry(m6);
        assertNull(e4);
    }

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    /**
     * floorEntry returns preceding entry.
     */
    public void testDescendingFloorEntry() {
        ConcurrentNavigableMap map = dmap5();
        Map.Entry e1 = map.floorEntry(m3);
        assertEquals(m3, e1.getKey());


        Map.Entry e2 = map.floorEntry(m6);
        assertEquals(m5, e2.getKey());


        Map.Entry e3 = map.floorEntry(m1);
        assertEquals(m1, e3.getKey());


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

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    /**
     * ceilingEntry returns next entry.
     */
    public void testDescendingCeilingEntry() {
        ConcurrentNavigableMap map = dmap5();
        Map.Entry e1 = map.ceilingEntry(m3);
        assertEquals(m3, e1.getKey());


        Map.Entry e2 = map.ceilingEntry(zero);
        assertEquals(m1, e2.getKey());


        Map.Entry e3 = map.ceilingEntry(m5);
        assertEquals(m5, e3.getKey());


        Map.Entry e4 = map.ceilingEntry(m6);
        assertNull(e4);
    }

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    /**
     * pollFirstEntry returns entries in order
     */
    public void testDescendingPollFirstEntry() {
        ConcurrentNavigableMap map = dmap5();
        Map.Entry e = map.pollFirstEntry();
        assertEquals(m1, e.getKey());
        assertEquals("A", e.getValue());
        e = map.pollFirstEntry();
        assertEquals(m2, e.getKey());
        map.put(m1, "A");
        e = map.pollFirstEntry();
        assertEquals(m1, e.getKey());
        assertEquals("A", e.getValue());
        e = map.pollFirstEntry();
        assertEquals(m3, e.getKey());
        map.remove(m4);
        e = map.pollFirstEntry();
        assertEquals(m5, e.getKey());
        try {
            e.setValue("A");
            shouldThrow();
        } catch (UnsupportedOperationException success) {}
        e = map.pollFirstEntry();
        assertNull(e);
    }

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    /**
     * pollLastEntry returns entries in order
     */
    public void testDescendingPollLastEntry() {
        ConcurrentNavigableMap map = dmap5();
        Map.Entry e = map.pollLastEntry();
        assertEquals(m5, e.getKey());
        assertEquals("E", e.getValue());
        e = map.pollLastEntry();
        assertEquals(m4, e.getKey());
        map.put(m5, "E");
        e = map.pollLastEntry();
        assertEquals(m5, e.getKey());
        assertEquals("E", e.getValue());
        e = map.pollLastEntry();
        assertEquals(m3, e.getKey());
        map.remove(m2);
        e = map.pollLastEntry();
        assertEquals(m1, 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 testDescendingSize() {
        ConcurrentNavigableMap map = dmap5();
        ConcurrentNavigableMap empty = dmap0();
        assertEquals(0, empty.size());
        assertEquals(5, map.size());
    }

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    /**
     * toString contains toString of elements
     */
    public void testDescendingToString() {
        ConcurrentNavigableMap map = dmap5();
        String s = map.toString();
        for (int i = 1; i <= 5; ++i) {
            assertTrue(s.indexOf(String.valueOf(i)) >= 0);
        }
    }

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    /**
     * get(null) of nm1mpty map throws NPE
     */
    public void testDescendingGet_NullPointerException() {
        try {
            ConcurrentNavigableMap c = dmap5();
            c.get(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * containsKey(null) of nm1mpty map throws NPE
     */
    public void testDescendingContainsKey_NullPointerException() {
        try {
            ConcurrentNavigableMap c = dmap5();
            c.containsKey(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * containsValue(null) throws NPE
     */
    public void testDescendingContainsValue_NullPointerException() {
        try {
            ConcurrentNavigableMap c = dmap0();
            c.containsValue(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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