| /* |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| * Other contributors include Andrew Wright, Jeffrey Hayes, |
| * Pat Fisher, Mike Judd. |
| */ |
| |
| package jsr166; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import java.util.Set; |
| import java.util.concurrent.CopyOnWriteArraySet; |
| |
| import junit.framework.Test; |
| import junit.framework.TestSuite; |
| |
| public class CopyOnWriteArraySetTest extends JSR166TestCase { |
| // android-note: Removed because the CTS runner does a bad job of |
| // retrying tests that have suite() declarations. |
| // |
| // public static void main(String[] args) { |
| // main(suite(), args); |
| // } |
| // public static Test suite() { |
| // return new TestSuite(CopyOnWriteArraySetTest.class); |
| // } |
| |
| static CopyOnWriteArraySet<Integer> populatedSet(int n) { |
| CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>(); |
| assertTrue(a.isEmpty()); |
| for (int i = 0; i < n; i++) |
| a.add(i); |
| assertEquals(n == 0, a.isEmpty()); |
| assertEquals(n, a.size()); |
| return a; |
| } |
| |
| static CopyOnWriteArraySet populatedSet(Integer[] elements) { |
| CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>(); |
| assertTrue(a.isEmpty()); |
| for (int i = 0; i < elements.length; i++) |
| a.add(elements[i]); |
| assertFalse(a.isEmpty()); |
| assertEquals(elements.length, a.size()); |
| return a; |
| } |
| |
| /** |
| * Default-constructed set is empty |
| */ |
| public void testConstructor() { |
| CopyOnWriteArraySet a = new CopyOnWriteArraySet(); |
| assertTrue(a.isEmpty()); |
| } |
| |
| /** |
| * Collection-constructed set holds all of its elements |
| */ |
| public void testConstructor3() { |
| Integer[] ints = new Integer[SIZE]; |
| for (int i = 0; i < SIZE - 1; ++i) |
| ints[i] = new Integer(i); |
| CopyOnWriteArraySet a = new CopyOnWriteArraySet(Arrays.asList(ints)); |
| for (int i = 0; i < SIZE; ++i) |
| assertTrue(a.contains(ints[i])); |
| } |
| |
| /** |
| * addAll adds each non-duplicate element from the given collection |
| */ |
| public void testAddAll() { |
| Set full = populatedSet(3); |
| assertTrue(full.addAll(Arrays.asList(three, four, five))); |
| assertEquals(6, full.size()); |
| assertFalse(full.addAll(Arrays.asList(three, four, five))); |
| assertEquals(6, full.size()); |
| } |
| |
| /** |
| * addAll adds each non-duplicate element from the given collection |
| */ |
| public void testAddAll2() { |
| Set full = populatedSet(3); |
| // "one" is duplicate and will not be added |
| assertTrue(full.addAll(Arrays.asList(three, four, one))); |
| assertEquals(5, full.size()); |
| assertFalse(full.addAll(Arrays.asList(three, four, one))); |
| assertEquals(5, full.size()); |
| } |
| |
| /** |
| * add will not add the element if it already exists in the set |
| */ |
| public void testAdd2() { |
| Set full = populatedSet(3); |
| full.add(one); |
| assertEquals(3, full.size()); |
| } |
| |
| /** |
| * add adds the element when it does not exist in the set |
| */ |
| public void testAdd3() { |
| Set full = populatedSet(3); |
| full.add(three); |
| assertTrue(full.contains(three)); |
| } |
| |
| /** |
| * clear removes all elements from the set |
| */ |
| public void testClear() { |
| Collection full = populatedSet(3); |
| full.clear(); |
| assertEquals(0, full.size()); |
| assertTrue(full.isEmpty()); |
| } |
| |
| /** |
| * contains returns true for added elements |
| */ |
| public void testContains() { |
| Collection full = populatedSet(3); |
| assertTrue(full.contains(one)); |
| assertFalse(full.contains(five)); |
| } |
| |
| /** |
| * Sets with equal elements are equal |
| */ |
| public void testEquals() { |
| CopyOnWriteArraySet a = populatedSet(3); |
| CopyOnWriteArraySet b = populatedSet(3); |
| assertTrue(a.equals(b)); |
| assertTrue(b.equals(a)); |
| assertTrue(a.containsAll(b)); |
| assertTrue(b.containsAll(a)); |
| assertEquals(a.hashCode(), b.hashCode()); |
| assertEquals(a.size(), b.size()); |
| |
| a.add(m1); |
| assertFalse(a.equals(b)); |
| assertFalse(b.equals(a)); |
| assertTrue(a.containsAll(b)); |
| assertFalse(b.containsAll(a)); |
| b.add(m1); |
| assertTrue(a.equals(b)); |
| assertTrue(b.equals(a)); |
| assertTrue(a.containsAll(b)); |
| assertTrue(b.containsAll(a)); |
| assertEquals(a.hashCode(), b.hashCode()); |
| |
| Object x = a.iterator().next(); |
| a.remove(x); |
| assertFalse(a.equals(b)); |
| assertFalse(b.equals(a)); |
| assertFalse(a.containsAll(b)); |
| assertTrue(b.containsAll(a)); |
| a.add(x); |
| assertTrue(a.equals(b)); |
| assertTrue(b.equals(a)); |
| assertTrue(a.containsAll(b)); |
| assertTrue(b.containsAll(a)); |
| assertEquals(a.hashCode(), b.hashCode()); |
| assertEquals(a.size(), b.size()); |
| |
| CopyOnWriteArraySet empty1 = new CopyOnWriteArraySet(Arrays.asList()); |
| CopyOnWriteArraySet empty2 = new CopyOnWriteArraySet(Arrays.asList()); |
| assertTrue(empty1.equals(empty1)); |
| assertTrue(empty1.equals(empty2)); |
| |
| assertFalse(empty1.equals(a)); |
| assertFalse(a.equals(empty1)); |
| |
| assertFalse(a.equals(null)); |
| } |
| |
| /** |
| * containsAll returns true for collections with subset of elements |
| */ |
| public void testContainsAll() { |
| Collection full = populatedSet(3); |
| assertTrue(full.containsAll(full)); |
| assertTrue(full.containsAll(Arrays.asList())); |
| assertTrue(full.containsAll(Arrays.asList(one))); |
| assertTrue(full.containsAll(Arrays.asList(one, two))); |
| assertFalse(full.containsAll(Arrays.asList(one, two, six))); |
| assertFalse(full.containsAll(Arrays.asList(six))); |
| |
| CopyOnWriteArraySet empty1 = new CopyOnWriteArraySet(Arrays.asList()); |
| CopyOnWriteArraySet empty2 = new CopyOnWriteArraySet(Arrays.asList()); |
| assertTrue(empty1.containsAll(empty2)); |
| assertTrue(empty1.containsAll(empty1)); |
| assertFalse(empty1.containsAll(full)); |
| assertTrue(full.containsAll(empty1)); |
| |
| try { |
| full.containsAll(null); |
| shouldThrow(); |
| } catch (NullPointerException success) {} |
| } |
| |
| /** |
| * isEmpty is true when empty, else false |
| */ |
| public void testIsEmpty() { |
| assertTrue(populatedSet(0).isEmpty()); |
| assertFalse(populatedSet(3).isEmpty()); |
| } |
| |
| /** |
| * iterator() returns an iterator containing the elements of the |
| * set in insertion order |
| */ |
| public void testIterator() { |
| Collection empty = new CopyOnWriteArraySet(); |
| assertFalse(empty.iterator().hasNext()); |
| try { |
| empty.iterator().next(); |
| shouldThrow(); |
| } catch (NoSuchElementException success) {} |
| |
| Integer[] elements = new Integer[SIZE]; |
| for (int i = 0; i < SIZE; i++) |
| elements[i] = i; |
| Collections.shuffle(Arrays.asList(elements)); |
| Collection<Integer> full = populatedSet(elements); |
| |
| Iterator it = full.iterator(); |
| for (int j = 0; j < SIZE; j++) { |
| assertTrue(it.hasNext()); |
| assertEquals(elements[j], it.next()); |
| } |
| assertIteratorExhausted(it); |
| } |
| |
| /** |
| * iterator of empty collection has no elements |
| */ |
| public void testEmptyIterator() { |
| assertIteratorExhausted(new CopyOnWriteArraySet().iterator()); |
| } |
| |
| /** |
| * iterator remove is unsupported |
| */ |
| public void testIteratorRemove() { |
| Collection full = populatedSet(3); |
| Iterator it = full.iterator(); |
| it.next(); |
| try { |
| it.remove(); |
| shouldThrow(); |
| } catch (UnsupportedOperationException success) {} |
| } |
| |
| /** |
| * toString holds toString of elements |
| */ |
| public void testToString() { |
| assertEquals("[]", new CopyOnWriteArraySet().toString()); |
| Collection full = populatedSet(3); |
| String s = full.toString(); |
| for (int i = 0; i < 3; ++i) |
| assertTrue(s.contains(String.valueOf(i))); |
| assertEquals(new ArrayList(full).toString(), |
| full.toString()); |
| } |
| |
| /** |
| * removeAll removes all elements from the given collection |
| */ |
| public void testRemoveAll() { |
| Set full = populatedSet(3); |
| assertTrue(full.removeAll(Arrays.asList(one, two))); |
| assertEquals(1, full.size()); |
| assertFalse(full.removeAll(Arrays.asList(one, two))); |
| assertEquals(1, full.size()); |
| } |
| |
| /** |
| * remove removes an element |
| */ |
| public void testRemove() { |
| Collection full = populatedSet(3); |
| full.remove(one); |
| assertFalse(full.contains(one)); |
| assertEquals(2, full.size()); |
| } |
| |
| /** |
| * size returns the number of elements |
| */ |
| public void testSize() { |
| Collection empty = new CopyOnWriteArraySet(); |
| Collection full = populatedSet(3); |
| assertEquals(3, full.size()); |
| assertEquals(0, empty.size()); |
| } |
| |
| /** |
| * toArray() returns an Object array containing all elements from |
| * the set in insertion order |
| */ |
| public void testToArray() { |
| Object[] a = new CopyOnWriteArraySet().toArray(); |
| assertTrue(Arrays.equals(new Object[0], a)); |
| assertSame(Object[].class, a.getClass()); |
| |
| Integer[] elements = new Integer[SIZE]; |
| for (int i = 0; i < SIZE; i++) |
| elements[i] = i; |
| Collections.shuffle(Arrays.asList(elements)); |
| Collection<Integer> full = populatedSet(elements); |
| |
| assertTrue(Arrays.equals(elements, full.toArray())); |
| assertSame(Object[].class, full.toArray().getClass()); |
| } |
| |
| /** |
| * toArray(Integer array) returns an Integer array containing all |
| * elements from the set in insertion order |
| */ |
| public void testToArray2() { |
| Collection empty = new CopyOnWriteArraySet(); |
| Integer[] a; |
| |
| a = new Integer[0]; |
| assertSame(a, empty.toArray(a)); |
| |
| a = new Integer[SIZE / 2]; |
| Arrays.fill(a, 42); |
| assertSame(a, empty.toArray(a)); |
| assertNull(a[0]); |
| for (int i = 1; i < a.length; i++) |
| assertEquals(42, (int) a[i]); |
| |
| Integer[] elements = new Integer[SIZE]; |
| for (int i = 0; i < SIZE; i++) |
| elements[i] = i; |
| Collections.shuffle(Arrays.asList(elements)); |
| Collection<Integer> full = populatedSet(elements); |
| |
| Arrays.fill(a, 42); |
| assertTrue(Arrays.equals(elements, full.toArray(a))); |
| for (int i = 0; i < a.length; i++) |
| assertEquals(42, (int) a[i]); |
| assertSame(Integer[].class, full.toArray(a).getClass()); |
| |
| a = new Integer[SIZE]; |
| Arrays.fill(a, 42); |
| assertSame(a, full.toArray(a)); |
| assertTrue(Arrays.equals(elements, a)); |
| |
| a = new Integer[2 * SIZE]; |
| Arrays.fill(a, 42); |
| assertSame(a, full.toArray(a)); |
| assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE))); |
| assertNull(a[SIZE]); |
| for (int i = SIZE + 1; i < a.length; i++) |
| assertEquals(42, (int) a[i]); |
| } |
| |
| /** |
| * toArray throws an ArrayStoreException when the given array can |
| * not store the objects inside the set |
| */ |
| public void testToArray_ArrayStoreException() { |
| CopyOnWriteArraySet c = new CopyOnWriteArraySet(); |
| c.add("zfasdfsdf"); |
| c.add("asdadasd"); |
| try { |
| c.toArray(new Long[5]); |
| shouldThrow(); |
| } catch (ArrayStoreException success) {} |
| } |
| |
| /** |
| * A deserialized serialized set is equal |
| */ |
| public void testSerialization() throws Exception { |
| Set x = populatedSet(SIZE); |
| Set y = serialClone(x); |
| |
| assertNotSame(y, x); |
| assertEquals(x.size(), y.size()); |
| assertEquals(x.toString(), y.toString()); |
| assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
| assertEquals(x, y); |
| assertEquals(y, x); |
| } |
| |
| /** |
| * addAll is idempotent |
| */ |
| public void testAddAll_idempotent() throws Exception { |
| Set x = populatedSet(SIZE); |
| Set y = new CopyOnWriteArraySet(x); |
| y.addAll(x); |
| assertEquals(x, y); |
| assertEquals(y, x); |
| } |
| |
| } |