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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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import static java.util.concurrent.TimeUnit.HOURS; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.Collections; |
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import java.util.Deque; |
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import java.util.NoSuchElementException; |
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import java.util.Queue; |
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import java.util.Spliterator; |
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import java.util.concurrent.BlockingDeque; |
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import java.util.concurrent.BlockingQueue; |
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import java.util.concurrent.CountDownLatch; |
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import java.util.concurrent.Executors; |
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import java.util.concurrent.ExecutorService; |
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} |
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/** Checks properties of empty collections. */ |
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public void testEmptyMeansEmpty() { |
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public void testEmptyMeansEmpty() throws InterruptedException { |
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Collection c = impl.emptyCollection(); |
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emptyMeansEmpty(c); |
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emptyMeansEmpty(clone); |
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} |
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void emptyMeansEmpty(Collection c) { |
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void emptyMeansEmpty(Collection c) throws InterruptedException { |
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assertTrue(c.isEmpty()); |
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assertEquals(0, c.size()); |
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assertEquals("[]", c.toString()); |
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assertSame(3, a[2]); |
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} |
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assertIteratorExhausted(c.iterator()); |
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Consumer alwaysThrows = (e) -> { throw new AssertionError(); }; |
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Consumer alwaysThrows = e -> { throw new AssertionError(); }; |
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c.forEach(alwaysThrows); |
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c.iterator().forEachRemaining(alwaysThrows); |
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c.spliterator().forEachRemaining(alwaysThrows); |
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assertFalse(d.removeFirstOccurrence(bomb())); |
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assertFalse(d.removeLastOccurrence(bomb())); |
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} |
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if (c instanceof BlockingQueue) { |
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BlockingQueue q = (BlockingQueue) c; |
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assertNull(q.poll(0L, MILLISECONDS)); |
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} |
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if (c instanceof BlockingDeque) { |
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BlockingDeque q = (BlockingDeque) c; |
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assertNull(q.pollFirst(0L, MILLISECONDS)); |
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assertNull(q.pollLast(0L, MILLISECONDS)); |
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} |
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} |
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public void testNullPointerExceptions() { |
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public void testNullPointerExceptions() throws InterruptedException { |
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Collection c = impl.emptyCollection(); |
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assertThrows( |
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NullPointerException.class, |
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NullPointerException.class, |
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() -> c.add(null)); |
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} |
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if (!impl.permitsNulls() |
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&& Queue.class.isAssignableFrom(impl.klazz())) { |
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if (!impl.permitsNulls() && c instanceof Queue) { |
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Queue q = (Queue) c; |
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assertThrows( |
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NullPointerException.class, |
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() -> q.offer(null)); |
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} |
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if (!impl.permitsNulls() |
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&& Deque.class.isAssignableFrom(impl.klazz())) { |
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if (!impl.permitsNulls() && c instanceof Deque) { |
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Deque d = (Deque) c; |
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assertThrows( |
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NullPointerException.class, |
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() -> d.push(null), |
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() -> d.descendingIterator().forEachRemaining(null)); |
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} |
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if (c instanceof BlockingQueue) { |
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BlockingQueue q = (BlockingQueue) c; |
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assertThrows( |
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NullPointerException.class, |
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() -> { |
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try { q.offer(null, 1L, HOURS); } |
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catch (InterruptedException ex) { |
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throw new AssertionError(ex); |
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}}, |
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() -> { |
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try { q.put(null); } |
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catch (InterruptedException ex) { |
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throw new AssertionError(ex); |
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}}); |
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} |
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if (c instanceof BlockingDeque) { |
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BlockingDeque q = (BlockingDeque) c; |
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assertThrows( |
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NullPointerException.class, |
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() -> { |
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try { q.offerFirst(null, 1L, HOURS); } |
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catch (InterruptedException ex) { |
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throw new AssertionError(ex); |
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}}, |
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() -> { |
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try { q.offerLast(null, 1L, HOURS); } |
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catch (InterruptedException ex) { |
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throw new AssertionError(ex); |
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}}, |
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() -> { |
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try { q.putFirst(null); } |
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catch (InterruptedException ex) { |
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throw new AssertionError(ex); |
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}}, |
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() -> { |
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try { q.putLast(null); } |
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catch (InterruptedException ex) { |
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throw new AssertionError(ex); |
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}}); |
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} |
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} |
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public void testNoSuchElementExceptions() { |
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NoSuchElementException.class, |
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() -> c.iterator().next()); |
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if (Queue.class.isAssignableFrom(impl.klazz())) { |
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if (c instanceof Queue) { |
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Queue q = (Queue) c; |
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assertThrows( |
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NoSuchElementException.class, |
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() -> q.element(), |
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() -> q.remove()); |
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} |
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if (Deque.class.isAssignableFrom(impl.klazz())) { |
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if (c instanceof Deque) { |
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Deque d = (Deque) c; |
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assertThrows( |
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NoSuchElementException.class, |
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public void testRemoveIf() { |
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Collection c = impl.emptyCollection(); |
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boolean ordered = |
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c.spliterator().hasCharacteristics(Spliterator.ORDERED); |
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ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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int n = rnd.nextInt(6); |
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for (int i = 0; i < n; i++) c.add(impl.makeElement(i)); |
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AtomicReference threwAt = new AtomicReference(null); |
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ArrayList survivors = new ArrayList(c); |
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List orig = rnd.nextBoolean() |
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? new ArrayList(c) |
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: Arrays.asList(c.toArray()); |
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// Merely creating an iterator can change ArrayBlockingQueue behavior |
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Iterator it = rnd.nextBoolean() ? c.iterator() : null; |
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ArrayList survivors = new ArrayList(); |
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ArrayList accepts = new ArrayList(); |
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ArrayList rejects = new ArrayList(); |
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Predicate randomPredicate = (e) -> { |
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|
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Predicate randomPredicate = e -> { |
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assertNull(threwAt.get()); |
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switch (rnd.nextInt(3)) { |
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case 0: accepts.add(e); return true; |
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} |
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}; |
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try { |
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assertFalse(survivors.contains(null)); |
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try { |
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boolean modified = c.removeIf(randomPredicate); |
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if (!modified) { |
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assertNull(threwAt.get()); |
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assertEquals(n, rejects.size()); |
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assertEquals(0, accepts.size()); |
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assertNull(threwAt.get()); |
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assertEquals(modified, accepts.size() > 0); |
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assertEquals(modified, rejects.size() != n); |
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assertEquals(accepts.size() + rejects.size(), n); |
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if (ordered) { |
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assertEquals(rejects, |
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Arrays.asList(c.toArray())); |
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} else { |
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assertEquals(new HashSet(rejects), |
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new HashSet(Arrays.asList(c.toArray()))); |
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} |
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} catch (ArithmeticException ok) {} |
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survivors.removeAll(accepts); |
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assertEquals(n - accepts.size(), c.size()); |
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} catch (ArithmeticException ok) { |
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assertNotNull(threwAt.get()); |
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assertTrue(c.contains(threwAt.get())); |
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} |
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if (it != null && impl.isConcurrent()) |
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// check for weakly consistent iterator |
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while (it.hasNext()) assertTrue(orig.contains(it.next())); |
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switch (rnd.nextInt(4)) { |
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case 0: survivors.addAll(c); break; |
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case 1: survivors.addAll(Arrays.asList(c.toArray())); break; |
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case 2: c.forEach(e -> survivors.add(e)); break; |
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case 3: for (Object e : c) survivors.add(e); break; |
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} |
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assertTrue(orig.containsAll(accepts)); |
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assertTrue(orig.containsAll(rejects)); |
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assertTrue(orig.containsAll(survivors)); |
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assertTrue(orig.containsAll(c)); |
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assertTrue(c.containsAll(rejects)); |
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assertTrue(c.containsAll(survivors)); |
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assertTrue(survivors.containsAll(rejects)); |
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for (Object x : accepts) assertFalse(c.contains(x)); |
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if (threwAt.get() == null) |
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assertEquals(accepts.size() + rejects.size(), n); |
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if (threwAt.get() == null) { |
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assertEquals(n - accepts.size(), c.size()); |
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for (Object x : accepts) assertFalse(c.contains(x)); |
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} else { |
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// Two acceptable behaviors: entire removeIf call is one |
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// transaction, or each element processed is one transaction. |
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assertTrue(n == c.size() || n == c.size() + accepts.size()); |
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int k = 0; |
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for (Object x : accepts) if (c.contains(x)) k++; |
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assertTrue(k == accepts.size() || k == 0); |
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} |
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} catch (Throwable ex) { |
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System.err.println(impl.klazz()); |
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System.err.printf("c=%s%n", c); |
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System.err.printf("n=%d%n", n); |
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System.err.printf("orig=%s%n", orig); |
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System.err.printf("accepts=%s%n", accepts); |
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System.err.printf("rejects=%s%n", rejects); |
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System.err.printf("survivors=%s%n", survivors); |
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System.err.printf("threw=%s%n", threwAt.get()); |
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System.err.printf("threwAt=%s%n", threwAt.get()); |
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throw ex; |
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} |
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} |
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/** |
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* Calling Iterator#remove() after Iterator#forEachRemaining |
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* should remove last element |
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* should (maybe) remove last element |
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*/ |
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public void testRemoveAfterForEachRemaining() { |
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Collection c = impl.emptyCollection(); |
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assertEquals(impl.makeElement(0), it.next()); |
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assertTrue(it.hasNext()); |
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assertEquals(impl.makeElement(1), it.next()); |
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it.forEachRemaining((e) -> {}); |
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it.remove(); |
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assertEquals(n - 1, c.size()); |
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for (int i = 0; i < n - 1; i++) |
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assertTrue(c.contains(impl.makeElement(i))); |
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assertFalse(c.contains(impl.makeElement(n - 1))); |
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it.forEachRemaining(e -> assertTrue(c.contains(e))); |
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if (testImplementationDetails) { |
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if (c instanceof java.util.concurrent.ArrayBlockingQueue) { |
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assertIteratorExhausted(it); |
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} else { |
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it.remove(); |
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assertEquals(n - 1, c.size()); |
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for (int i = 0; i < n - 1; i++) |
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assertTrue(c.contains(impl.makeElement(i))); |
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assertFalse(c.contains(impl.makeElement(n - 1))); |
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} |
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} |
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} |
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if (c instanceof Deque) { |
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Deque d = (Deque) impl.emptyCollection(); |
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assertEquals(impl.makeElement(n - 1), it.next()); |
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assertTrue(it.hasNext()); |
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assertEquals(impl.makeElement(n - 2), it.next()); |
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it.forEachRemaining((e) -> {}); |
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it.remove(); |
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assertEquals(n - 1, d.size()); |
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for (int i = 1; i < n; i++) |
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assertTrue(d.contains(impl.makeElement(i))); |
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assertFalse(d.contains(impl.makeElement(0))); |
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it.forEachRemaining(e -> assertTrue(c.contains(e))); |
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if (testImplementationDetails) { |
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it.remove(); |
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assertEquals(n - 1, d.size()); |
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for (int i = 1; i < n; i++) |
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assertTrue(d.contains(impl.makeElement(i))); |
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assertFalse(d.contains(impl.makeElement(0))); |
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} |
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} |
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} |
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final Object x = impl.makeElement(1); |
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final Object y = impl.makeElement(2); |
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final ArrayList found = new ArrayList(); |
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Consumer<Object> spy = (o) -> { found.add(o); }; |
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> |
Consumer<Object> spy = o -> found.add(o); |
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c.stream().forEach(spy); |
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assertTrue(found.isEmpty()); |
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Runnable checkElt = () -> { |
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threadsStarted.countDown(); |
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while (!done.get()) |
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c.stream().forEach((x) -> { assertSame(x, elt); }); }; |
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c.stream().forEach(x -> assertSame(x, elt)); }; |
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Runnable addRemove = () -> { |
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threadsStarted.countDown(); |
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while (!done.get()) { |
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final Object x = impl.makeElement(1); |
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final Object y = impl.makeElement(2); |
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final ArrayList found = new ArrayList(); |
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Consumer<Object> spy = (o) -> { found.add(o); }; |
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Consumer<Object> spy = o -> found.add(o); |
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c.forEach(spy); |
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assertTrue(found.isEmpty()); |
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Runnable checkElt = () -> { |
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threadsStarted.countDown(); |
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while (!done.get()) |
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c.forEach((x) -> { assertSame(x, elt); }); }; |
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c.forEach(x -> assertSame(x, elt)); }; |
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Runnable addRemove = () -> { |
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threadsStarted.countDown(); |
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while (!done.get()) { |