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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* 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 populatedSet(int n) {
CopyOnWriteArraySet a = new CopyOnWriteArraySet();
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 a = new CopyOnWriteArraySet();
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 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 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 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);
}
}