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

    /**
     * put(null,x) throws NPE
     */
    public void testDescendingPut1_NullPointerException() {
        try {
            ConcurrentNavigableMap c = dmap5();
            c.put(null, "whatever");
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * putIfAbsent(null, x) throws NPE
     */
    public void testDescendingPutIfAbsent1_NullPointerException() {
        try {
            ConcurrentNavigableMap c = dmap5();
            c.putIfAbsent(null, "whatever");
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * replace(null, x) throws NPE
     */
    public void testDescendingReplace_NullPointerException() {
        try {
            ConcurrentNavigableMap c = dmap5();
            c.replace(null, "whatever");
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * replace(null, x, y) throws NPE
     */
    public void testDescendingReplaceValue_NullPointerException() {
        try {
            ConcurrentNavigableMap c = dmap5();
            c.replace(null, m1, "whatever");
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * remove(null) throws NPE
     */
    public void testDescendingRemove1_NullPointerException() {
        try {
            ConcurrentNavigableMap c = dmap5();
            c.remove(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * remove(null, x) throws NPE
     */
    public void testDescendingRemove2_NullPointerException() {
        try {
            ConcurrentNavigableMap c = dmap5();
            c.remove(null, "whatever");
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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    /**
     * A deserialized map equals original
     */
    public void testDescendingSerialization() throws Exception {
        ConcurrentNavigableMap q = dmap5();


        ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
        ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
        out.writeObject(q);
        out.close();


        ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
        ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
        ConcurrentNavigableMap r = (ConcurrentNavigableMap)in.readObject();
        assertEquals(q.size(), r.size());
        assertTrue(q.equals(r));
        assertTrue(r.equals(q));
    }

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    /**
     * subMap returns map with keys in requested range
     */
    public void testDescendingSubMapContents() {
        ConcurrentNavigableMap map = dmap5();
        SortedMap sm = map.subMap(m2, m4);
        assertEquals(m2, sm.firstKey());
        assertEquals(m3, sm.lastKey());
        assertEquals(2, sm.size());
        assertFalse(sm.containsKey(m1));
        assertTrue(sm.containsKey(m2));
        assertTrue(sm.containsKey(m3));
        assertFalse(sm.containsKey(m4));
        assertFalse(sm.containsKey(m5));
        Iterator i = sm.keySet().iterator();
        Object k;
        k = (Integer)(i.next());
        assertEquals(m2, k);
        k = (Integer)(i.next());
        assertEquals(m3, k);
        assertFalse(i.hasNext());
        Iterator j = sm.keySet().iterator();
        j.next();
        j.remove();
        assertFalse(map.containsKey(m2));
        assertEquals(4, map.size());
        assertEquals(1, sm.size());
        assertEquals(m3, sm.firstKey());
        assertEquals(m3, sm.lastKey());
        assertEquals("C", sm.remove(m3));
        assertTrue(sm.isEmpty());
        assertEquals(3, map.size());
    }

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        assertTrue(sm.isEmpty());
        assertEquals(3, map.size());
    }


    public void testDescendingSubMapContents2() {
        ConcurrentNavigableMap map = dmap5();
        SortedMap sm = map.subMap(m2, m3);
        assertEquals(1, sm.size());
        assertEquals(m2, sm.firstKey());
        assertEquals(m2, sm.lastKey());
        assertFalse(sm.containsKey(m1));
        assertTrue(sm.containsKey(m2));
        assertFalse(sm.containsKey(m3));
        assertFalse(sm.containsKey(m4));
        assertFalse(sm.containsKey(m5));
        Iterator i = sm.keySet().iterator();
        Object k;
        k = (Integer)(i.next());
        assertEquals(m2, k);
        assertFalse(i.hasNext());
        Iterator j = sm.keySet().iterator();
        j.next();
        j.remove();
        assertFalse(map.containsKey(m2));
        assertEquals(4, map.size());
        assertEquals(0, sm.size());
        assertTrue(sm.isEmpty());
        assertSame(sm.remove(m3), null);
        assertEquals(4, map.size());
    }

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    /**
     * headMap returns map with keys in requested range
     */
    public void testDescendingHeadMapContents() {
        ConcurrentNavigableMap map = dmap5();
        SortedMap sm = map.headMap(m4);
        assertTrue(sm.containsKey(m1));
        assertTrue(sm.containsKey(m2));
        assertTrue(sm.containsKey(m3));
        assertFalse(sm.containsKey(m4));
        assertFalse(sm.containsKey(m5));
        Iterator i = sm.keySet().iterator();
        Object k;
        k = (Integer)(i.next());
        assertEquals(m1, k);
        k = (Integer)(i.next());
        assertEquals(m2, k);
        k = (Integer)(i.next());
        assertEquals(m3, k);
        assertFalse(i.hasNext());
        sm.clear();
        assertTrue(sm.isEmpty());
        assertEquals(2, map.size());
        assertEquals(m4, map.firstKey());
    }

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