@Test
public void testRemove0() {
IntOpenHashSet s = new IntOpenHashSet(Hash.DEFAULT_INITIAL_SIZE);
for (int i = -1; i <= 1; i++) assertTrue(s.add(i));
assertTrue(s.remove(0));
IntIterator iterator = s.iterator();
IntOpenHashSet z = new IntOpenHashSet();
z.add(iterator.nextInt());
z.add(iterator.nextInt());
assertFalse(iterator.hasNext());
assertEquals(new IntOpenHashSet(new int[] {-1, 1}), z);
s = new IntOpenHashSet(Hash.DEFAULT_INITIAL_SIZE);
for (int i = -1; i <= 1; i++) assertTrue(s.add(i));
iterator = s.iterator();
while (iterator.hasNext()) if (iterator.nextInt() == 0) iterator.remove();
assertFalse(s.contains(0));
iterator = s.iterator();
int[] content = new int[2];
content[0] = iterator.nextInt();
content[1] = iterator.nextInt();
assertFalse(iterator.hasNext());
Arrays.sort(content);
assertArrayEquals(new int[] {-1, 1}, content);
}
@SuppressWarnings("boxing")
private static void checkTable(IntOpenHashSet s) {
final int[] key = s.key;
assert (s.n & -s.n) == s.n : "Table length is not a power of two: " + s.n;
assert s.n == s.key.length - 1;
int n = s.n;
while (n-- != 0)
if (key[n] != 0 && !s.contains(key[n]))
throw new AssertionError(
"Hash table has key "
+ key[n]
+ " marked as occupied, but the key does not belong to the table");
if (s.containsNull && !s.contains(0))
throw new AssertionError(
"Hash table should contain zero by internal state, but it doesn't when queried");
if (!s.containsNull && s.contains(0))
throw new AssertionError(
"Hash table should not contain zero by internal state, but it does when queried");
java.util.HashSet<Integer> t = new java.util.HashSet<Integer>();
for (int i = s.size(); i-- != 0; )
if (key[i] != 0 && !t.add(key[i]))
throw new AssertionError("Key " + key[i] + " appears twice");
}
@Test
public void testRemove() {
IntOpenHashSet s = new IntOpenHashSet(Hash.DEFAULT_INITIAL_SIZE);
for (int i = 0; i < 100; i++) assertTrue(s.add(i));
for (int i = 0; i < 100; i++) assertFalse(s.remove(100 + i));
for (int i = 50; i < 150; i++) assertTrue(Integer.toString(i % 100), s.remove(i % 100));
}
@Test
public void testConstructorFromContainer() {
IntOpenHashSet list2 = new IntOpenHashSet();
list2.add(1, 3, 5);
set = new IntDoubleLinkedSet(list2);
assertEquals(3, set.size());
assertSortedListEquals(list2.toArray(), set.toArray());
}
@Test
public void testFromMethod() {
IntOpenHashSet list2 = new IntOpenHashSet();
list2.add(1, 3, 5);
IntDoubleLinkedSet s1 = IntDoubleLinkedSet.from(1, 3, 5);
IntDoubleLinkedSet s2 = IntDoubleLinkedSet.from(1, 3, 5);
assertSortedListEquals(list2.toArray(), s1.toArray());
assertSortedListEquals(list2.toArray(), s2.toArray());
}
@Test
public void testRemoveAllFromLookupContainer() {
set.add(0, 1, 2, 3, 4);
IntOpenHashSet list2 = new IntOpenHashSet();
list2.add(1, 3, 5);
assertEquals(2, set.removeAll(list2));
assertEquals(3, set.size());
assertSortedListEquals(set.toArray(), 0, 2, 4);
}
@Test
public void testSmallExpectedValuesWeirdLoadFactors() {
for (int expected = 0; expected < 5; expected++)
for (float loadFactor : new float[] {Float.MIN_VALUE, .25f, .5f, .75f, 1 - Float.MIN_VALUE}) {
IntOpenHashSet s = new IntOpenHashSet(0, loadFactor);
assertTrue(s.add(2));
assertTrue(s.add(3));
assertFalse(s.add(2));
assertFalse(s.add(3));
}
}
@Test
public void testStrangeRetainAllCase() {
IntArrayList initialElements =
IntArrayList.wrap(
new int[] {
586, 940, 1086, 1110, 1168, 1184, 1185, 1191, 1196, 1229, 1237, 1241, 1277, 1282,
1284, 1299, 1308, 1309, 1310, 1314, 1328, 1360, 1366, 1370, 1378, 1388, 1392, 1402,
1406, 1411, 1426, 1437, 1455, 1476, 1489, 1513, 1533, 1538, 1540, 1541, 1543, 1547,
1548, 1551, 1557, 1568, 1575, 1577, 1582, 1583, 1584, 1588, 1591, 1592, 1601, 1610,
1618, 1620, 1633, 1635, 1653, 1654, 1655, 1660, 1661, 1665, 1674, 1686, 1688, 1693,
1700, 1705, 1717, 1720, 1732, 1739, 1740, 1745, 1746, 1752, 1754, 1756, 1765, 1766,
1767, 1771, 1772, 1781, 1789, 1790, 1793, 1801, 1806, 1823, 1825, 1827, 1828, 1829,
1831, 1832, 1837, 1839, 1844, 2962, 2969, 2974, 2990, 3019, 3023, 3029, 3030, 3052,
3072, 3074, 3075, 3093, 3109, 3110, 3115, 3116, 3125, 3137, 3142, 3156, 3160, 3176,
3180, 3188, 3193, 3198, 3207, 3209, 3210, 3213, 3214, 3221, 3225, 3230, 3231, 3236,
3240, 3247, 3261, 4824, 4825, 4834, 4845, 4852, 4858, 4859, 4867, 4871, 4883, 4886,
4887, 4905, 4907, 4911, 4920, 4923, 4924, 4925, 4934, 4942, 4953, 4957, 4965, 4973,
4976, 4980, 4982, 4990, 4993, 6938, 6949, 6953, 7010, 7012, 7034, 7037, 7049, 7076,
7094, 7379, 7384, 7388, 7394, 7414, 7419, 7458, 7459, 7466, 7467
});
IntArrayList retainElements = IntArrayList.wrap(new int[] {586});
// Initialize both implementations with the same data
IntOpenHashSet instance = new IntOpenHashSet(initialElements);
IntRBTreeSet referenceInstance = new IntRBTreeSet(initialElements);
instance.retainAll(retainElements);
referenceInstance.retainAll(retainElements);
// print the correct result {586}
// System.out.println("ref: " + referenceInstance);
// prints {586, 7379}, which is clearly wrong
// System.out.println("ohm: " + instance);
// Fails
assertEquals(referenceInstance, instance);
}
@Test
public void testWrapAround() {
IntOpenHashSet s = new IntOpenHashSet(4, .5f);
assertEquals(8, s.n);
// The following code inverts HashCommon.phiMix() and places strategically keys in slots 6, 7
// and 0
s.add(HashCommon.invMix(6));
s.add(HashCommon.invMix(7));
s.add(HashCommon.invMix(6 + 8));
assertNotEquals(0, s.key[0]);
assertNotEquals(0, s.key[6]);
assertNotEquals(0, s.key[7]);
IntOpenHashSet keys = s.clone();
IntIterator iterator = s.iterator();
IntOpenHashSet t = new IntOpenHashSet();
t.add(iterator.nextInt());
t.add(iterator.nextInt());
// Originally, this remove would move the entry in slot 0 in slot 6 and we would return the
// entry in 0 twice
iterator.remove();
t.add(iterator.nextInt());
assertEquals(keys, t);
}
@SuppressWarnings({"unchecked", "boxing"})
private static void test(int n, float f) throws IOException, ClassNotFoundException {
int c;
IntOpenHashSet m = new IntOpenHashSet(Hash.DEFAULT_INITIAL_SIZE, f);
java.util.Set t = new java.util.HashSet();
/* First of all, we fill t with random data. */
for (int i = 0; i < Math.ceil(f * n); i++) t.add((Integer.valueOf(genKey())));
/* Now we add to m the same data */
m.addAll(t);
checkTable(m);
assertTrue("Error: !m.equals(t) after insertion", m.equals(t));
assertTrue("Error: !t.equals(m) after insertion", t.equals(m));
printProbes(m);
/* Now we check that m actually holds that data. */
for (java.util.Iterator i = t.iterator(); i.hasNext(); ) {
Object e = i.next();
assertTrue(
"Error: m and t differ on a key (" + e + ") after insertion (iterating on t)",
m.contains(e));
}
/* Now we check that m actually holds that data, but iterating on m. */
c = 0;
for (java.util.Iterator i = m.iterator(); i.hasNext(); ) {
Object e = i.next();
c++;
assertTrue(
"Error: m and t differ on a key (" + e + ") after insertion (iterating on m)",
t.contains(e));
}
assertEquals(
"Error: m has only "
+ c
+ " keys instead of "
+ t.size()
+ " after insertion (iterating on m)",
c,
t.size());
/*
* Now we check that inquiries about random data give the same answer in m and t. For m we
* use the polymorphic method.
*/
for (int i = 0; i < n; i++) {
int T = genKey();
assertEquals(
"Error: divergence in keys between t and m (polymorphic method)",
m.contains(T),
t.contains((Integer.valueOf(T))));
}
/*
* Again, we check that inquiries about random data give the same answer in m and t, but for
* m we use the standard method.
*/
for (int i = 0; i < n; i++) {
int T = genKey();
assertFalse(
"Error: divergence between t and m (standard method)",
m.contains((Integer.valueOf(T))) != t.contains((Integer.valueOf(T))));
}
/* Now we put and remove random data in m and t, checking that the result is the same. */
for (int i = 0; i < 20 * n; i++) {
int T = genKey();
assertFalse(
"Error: divergence in add() between t and m",
m.add((Integer.valueOf(T))) != t.add((Integer.valueOf(T))));
T = genKey();
assertFalse(
"Error: divergence in remove() between t and m",
m.remove((Integer.valueOf(T))) != t.remove((Integer.valueOf(T))));
}
checkTable(m);
assertTrue("Error: !m.equals(t) after removal", m.equals(t));
assertTrue("Error: !t.equals(m) after removal", t.equals(m));
/* Now we check that m actually holds that data. */
for (java.util.Iterator i = t.iterator(); i.hasNext(); ) {
Object e = i.next();
assertFalse(
"Error: m and t differ on a key (" + e + ") after removal (iterating on t)",
!m.contains(e));
}
/* Now we check that m actually holds that data, but iterating on m. */
for (java.util.Iterator i = m.iterator(); i.hasNext(); ) {
Object e = i.next();
assertFalse(
"Error: m and t differ on a key (" + e + ") after removal (iterating on m)",
!t.contains(e));
}
/* Now we make m into an array, make it again a set and check it is OK. */
int a[] = m.toIntArray();
assertTrue(
"Error: toArray() output (or array-based constructor) is not OK",
new IntOpenHashSet(a).equals(m));
/* Now we check cloning. */
assertTrue("Error: m does not equal m.clone()", m.equals(m.clone()));
assertTrue("Error: m.clone() does not equal m", m.clone().equals(m));
int h = m.hashCode();
/* Now we save and read m. */
java.io.File ff = new java.io.File("it.unimi.dsi.fastutil.test");
java.io.OutputStream os = new java.io.FileOutputStream(ff);
java.io.ObjectOutputStream oos = new java.io.ObjectOutputStream(os);
oos.writeObject(m);
oos.close();
java.io.InputStream is = new java.io.FileInputStream(ff);
java.io.ObjectInputStream ois = new java.io.ObjectInputStream(is);
m = (IntOpenHashSet) ois.readObject();
ois.close();
ff.delete();
assertEquals("Error: hashCode() changed after save/read", h, m.hashCode());
printProbes(m);
checkTable(m);
/* Now we check that m actually holds that data, but iterating on m. */
for (java.util.Iterator i = m.iterator(); i.hasNext(); ) {
Object e = i.next();
assertFalse("Error: m and t differ on a key (" + e + ") after save/read", !t.contains(e));
}
/* Now we put and remove random data in m and t, checking that the result is the same. */
for (int i = 0; i < 20 * n; i++) {
int T = genKey();
assertFalse(
"Error: divergence in add() between t and m after save/read",
m.add((Integer.valueOf(T))) != t.add((Integer.valueOf(T))));
T = genKey();
assertFalse(
"Error: divergence in remove() between t and m after save/read",
m.remove((Integer.valueOf(T))) != t.remove((Integer.valueOf(T))));
}
assertTrue("Error: !m.equals(t) after post-save/read removal", m.equals(t));
assertTrue("Error: !t.equals(m) after post-save/read removal", t.equals(m));
/* Now we take out of m everything, and check that it is empty. */
for (java.util.Iterator i = m.iterator(); i.hasNext(); ) {
i.next();
i.remove();
}
assertFalse("Error: m is not empty (as it should be)", !m.isEmpty());
m = new IntOpenHashSet(n, f);
t.clear();
/* Now we torture-test the hash table. This part is implemented only for integers and longs. */
for (int i = n; i-- != 0; ) m.add(i);
t.addAll(m);
printProbes(m);
checkTable(m);
for (int i = n; i-- != 0; )
assertEquals(
"Error: m and t differ on a key during torture-test insertion.",
m.add(i),
t.add((Integer.valueOf(i))));
assertTrue("Error: !m.equals(t) after torture-test insertion", m.equals(t));
assertTrue("Error: !t.equals(m) after torture-test insertion", t.equals(m));
for (int i = n; i-- != 0; )
assertEquals(
"Error: m and t differ on a key during torture-test insertion.",
m.remove(i),
t.remove((Integer.valueOf(i))));
assertTrue("Error: !m.equals(t) after torture-test removal", m.equals(t));
assertTrue("Error: !t.equals(m) after torture-test removal", t.equals(m));
assertTrue("Error: !m.equals(m.clone()) after torture-test removal", m.equals(m.clone()));
assertTrue("Error: !m.clone().equals(m) after torture-test removal", m.clone().equals(m));
return;
}
@Test
public void testWrapAround3() {
IntOpenHashSet s = new IntOpenHashSet(4, .75f);
assertEquals(8, s.n);
// The following code inverts HashCommon.phiMix() and places strategically keys in slots 5, 6,
// 7, 0 and 1
s.add(HashCommon.invMix(5));
s.add(HashCommon.invMix(5 + 8));
s.add(HashCommon.invMix(5 + 16));
s.add(HashCommon.invMix(5 + 32));
s.add(HashCommon.invMix(5 + 64));
assertNotEquals(0, s.key[5]);
assertNotEquals(0, s.key[6]);
assertNotEquals(0, s.key[7]);
assertNotEquals(0, s.key[0]);
assertNotEquals(0, s.key[1]);
// System.err.println(Arrays.toString( s.key ));
IntOpenHashSet keys = s.clone();
IntIterator iterator = s.iterator();
IntOpenHashSet t = new IntOpenHashSet();
assertTrue(t.add(iterator.nextInt()));
iterator.remove();
// System.err.println(Arrays.toString( s.key ));
assertTrue(t.add(iterator.nextInt()));
iterator.remove();
// System.err.println(Arrays.toString( s.key ));
// Originally, this remove would move the entry in slot 0 in slot 6 and we would return the
// entry in 0 twice
assertTrue(t.add(iterator.nextInt()));
iterator.remove();
// System.err.println(Arrays.toString( s.key ));
assertTrue(t.add(iterator.nextInt()));
iterator.remove();
// System.err.println(Arrays.toString( s.key ));
assertTrue(t.add(iterator.nextInt()));
iterator.remove();
assertEquals(0, s.size());
assertEquals(keys, t);
}