/*
* 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/licenses/publicdomain
* Other contributors include Andrew Wright, Jeffrey Hayes,
* Pat Fisher, Mike Judd.
*/
import junit.framework.*;
import java.util.*;
import java.util.concurrent.*;
import java.io.*;
public class PriorityQueueTest extends JSR166TestCase {
public static void main(String[] args) {
junit.textui.TestRunner.run (suite());
}
public static Test suite() {
return new TestSuite(PriorityQueueTest.class);
}
static class MyReverseComparator implements Comparator {
public int compare(Object x, Object y) {
int i = ((Integer)x).intValue();
int j = ((Integer)y).intValue();
if (i < j) return 1;
if (i > j) return -1;
return 0;
}
}
/**
* Create a queue of given size containing consecutive
* Integers 0 ... n.
*/
private PriorityQueue populatedQueue(int n) {
PriorityQueue q = new PriorityQueue(n);
assertTrue(q.isEmpty());
for(int i = n-1; i >= 0; i-=2)
assertTrue(q.offer(new Integer(i)));
for(int i = (n & 1); i < n; i+=2)
assertTrue(q.offer(new Integer(i)));
assertFalse(q.isEmpty());
assertEquals(n, q.size());
return q;
}
/**
* A new queue has unbounded capacity
*/
public void testConstructor1() {
assertEquals(0, new PriorityQueue(SIZE).size());
}
/**
* Constructor throws IAE if capacity argument nonpositive
*/
public void testConstructor2() {
try {
PriorityQueue q = new PriorityQueue(0);
shouldThrow();
}
catch (IllegalArgumentException success) {}
}
/**
* Initializing from null Collection throws NPE
*/
public void testConstructor3() {
try {
PriorityQueue q = new PriorityQueue((Collection)null);
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* Initializing from Collection of null elements throws NPE
*/
public void testConstructor4() {
try {
Integer[] ints = new Integer[SIZE];
PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* Initializing from Collection with some null elements throws NPE
*/
public void testConstructor5() {
try {
Integer[] ints = new Integer[SIZE];
for (int i = 0; i < SIZE-1; ++i)
ints[i] = new Integer(i);
PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* Queue contains all elements of collection used to initialize
*/
public void testConstructor6() {
try {
Integer[] ints = new Integer[SIZE];
for (int i = 0; i < SIZE; ++i)
ints[i] = new Integer(i);
PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
for (int i = 0; i < SIZE; ++i)
assertEquals(ints[i], q.poll());
}
finally {}
}
/**
* The comparator used in constructor is used
*/
public void testConstructor7() {
try {
MyReverseComparator cmp = new MyReverseComparator();
PriorityQueue q = new PriorityQueue(SIZE, cmp);
assertEquals(cmp, q.comparator());
Integer[] ints = new Integer[SIZE];
for (int i = 0; i < SIZE; ++i)
ints[i] = new Integer(i);
q.addAll(Arrays.asList(ints));
for (int i = SIZE-1; i >= 0; --i)
assertEquals(ints[i], q.poll());
}
finally {}
}
/**
* isEmpty is true before add, false after
*/
public void testEmpty() {
PriorityQueue q = new PriorityQueue(2);
assertTrue(q.isEmpty());
q.add(new Integer(1));
assertFalse(q.isEmpty());
q.add(new Integer(2));
q.remove();
q.remove();
assertTrue(q.isEmpty());
}
/**
* size changes when elements added and removed
*/
public void testSize() {
PriorityQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(SIZE-i, q.size());
q.remove();
}
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.size());
q.add(new Integer(i));
}
}
/**
* offer(null) throws NPE
*/
public void testOfferNull() {
try {
PriorityQueue q = new PriorityQueue(1);
q.offer(null);
shouldThrow();
} catch (NullPointerException success) { }
}
/**
* add(null) throws NPE
*/
public void testAddNull() {
try {
PriorityQueue q = new PriorityQueue(1);
q.add(null);
shouldThrow();
} catch (NullPointerException success) { }
}
/**
* Offer of comparable element succeeds
*/
public void testOffer() {
PriorityQueue q = new PriorityQueue(1);
assertTrue(q.offer(zero));
assertTrue(q.offer(one));
}
/**
* Offer of non-Comparable throws CCE
*/
public void testOfferNonComparable() {
try {
PriorityQueue q = new PriorityQueue(1);
q.offer(new Object());
q.offer(new Object());
q.offer(new Object());
shouldThrow();
}
catch(ClassCastException success) {}
}
/**
* add of comparable succeeds
*/
public void testAdd() {
PriorityQueue q = new PriorityQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.size());
assertTrue(q.add(new Integer(i)));
}
}
/**
* addAll(null) throws NPE
*/
public void testAddAll1() {
try {
PriorityQueue q = new PriorityQueue(1);
q.addAll(null);
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* addAll of a collection with null elements throws NPE
*/
public void testAddAll2() {
try {
PriorityQueue q = new PriorityQueue(SIZE);
Integer[] ints = new Integer[SIZE];
q.addAll(Arrays.asList(ints));
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* addAll of a collection with any null elements throws NPE after
* possibly adding some elements
*/
public void testAddAll3() {
try {
PriorityQueue q = new PriorityQueue(SIZE);
Integer[] ints = new Integer[SIZE];
for (int i = 0; i < SIZE-1; ++i)
ints[i] = new Integer(i);
q.addAll(Arrays.asList(ints));
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* Queue contains all elements of successful addAll
*/
public void testAddAll5() {
try {
Integer[] empty = new Integer[0];
Integer[] ints = new Integer[SIZE];
for (int i = 0; i < SIZE; ++i)
ints[i] = new Integer(SIZE-1-i);
PriorityQueue q = new PriorityQueue(SIZE);
assertFalse(q.addAll(Arrays.asList(empty)));
assertTrue(q.addAll(Arrays.asList(ints)));
for (int i = 0; i < SIZE; ++i)
assertEquals(new Integer(i), q.poll());
}
finally {}
}
/**
* poll succeeds unless empty
*/
public void testPoll() {
PriorityQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, ((Integer)q.poll()).intValue());
}
assertNull(q.poll());
}
/**
* peek returns next element, or null if empty
*/
public void testPeek() {
PriorityQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, ((Integer)q.peek()).intValue());
q.poll();
assertTrue(q.peek() == null ||
i != ((Integer)q.peek()).intValue());
}
assertNull(q.peek());
}
/**
* element returns next element, or throws NSEE if empty
*/
public void testElement() {
PriorityQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, ((Integer)q.element()).intValue());
q.poll();
}
try {
q.element();
shouldThrow();
}
catch (NoSuchElementException success) {}
}
/**
* remove removes next element, or throws NSEE if empty
*/
public void testRemove() {
PriorityQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, ((Integer)q.remove()).intValue());
}
try {
q.remove();
shouldThrow();
} catch (NoSuchElementException success){
}
}
/**
* remove(x) removes x and returns true if present
*/
public void testRemoveElement() {
PriorityQueue q = populatedQueue(SIZE);
for (int i = 1; i < SIZE; i+=2) {
assertTrue(q.remove(new Integer(i)));
}
for (int i = 0; i < SIZE; i+=2) {
assertTrue(q.remove(new Integer(i)));
assertFalse(q.remove(new Integer(i+1)));
}
assertTrue(q.isEmpty());
}
/**
* contains(x) reports true when elements added but not yet removed
*/
public void testContains() {
PriorityQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertTrue(q.contains(new Integer(i)));
q.poll();
assertFalse(q.contains(new Integer(i)));
}
}
/**
* clear removes all elements
*/
public void testClear() {
PriorityQueue q = populatedQueue(SIZE);
q.clear();
assertTrue(q.isEmpty());
assertEquals(0, q.size());
q.add(new Integer(1));
assertFalse(q.isEmpty());
q.clear();
assertTrue(q.isEmpty());
}
/**
* containsAll(c) is true when c contains a subset of elements
*/
public void testContainsAll() {
PriorityQueue q = populatedQueue(SIZE);
PriorityQueue p = new PriorityQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertTrue(q.containsAll(p));
assertFalse(p.containsAll(q));
p.add(new Integer(i));
}
assertTrue(p.containsAll(q));
}
/**
* retainAll(c) retains only those elements of c and reports true if changed
*/
public void testRetainAll() {
PriorityQueue q = populatedQueue(SIZE);
PriorityQueue p = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
boolean changed = q.retainAll(p);
if (i == 0)
assertFalse(changed);
else
assertTrue(changed);
assertTrue(q.containsAll(p));
assertEquals(SIZE-i, q.size());
p.remove();
}
}
/**
* removeAll(c) removes only those elements of c and reports true if changed
*/
public void testRemoveAll() {
for (int i = 1; i < SIZE; ++i) {
PriorityQueue q = populatedQueue(SIZE);
PriorityQueue p = populatedQueue(i);
assertTrue(q.removeAll(p));
assertEquals(SIZE-i, q.size());
for (int j = 0; j < i; ++j) {
Integer I = (Integer)(p.remove());
assertFalse(q.contains(I));
}
}
}
/**
* toArray contains all elements
*/
public void testToArray() {
PriorityQueue q = populatedQueue(SIZE);
Object[] o = q.toArray();
Arrays.sort(o);
for(int i = 0; i < o.length; i++)
assertEquals(o[i], q.poll());
}
/**
* toArray(a) contains all elements
*/
public void testToArray2() {
PriorityQueue q = populatedQueue(SIZE);
Integer[] ints = new Integer[SIZE];
ints = (Integer[])q.toArray(ints);
Arrays.sort(ints);
for(int i = 0; i < ints.length; i++)
assertEquals(ints[i], q.poll());
}
/**
* iterator iterates through all elements
*/
public void testIterator() {
PriorityQueue q = populatedQueue(SIZE);
int i = 0;
Iterator it = q.iterator();
while(it.hasNext()) {
assertTrue(q.contains(it.next()));
++i;
}
assertEquals(i, SIZE);
}
/**
* iterator.remove removes current element
*/
public void testIteratorRemove () {
final PriorityQueue q = new PriorityQueue(3);
q.add(new Integer(2));
q.add(new Integer(1));
q.add(new Integer(3));
Iterator it = q.iterator();
it.next();
it.remove();
it = q.iterator();
assertEquals(it.next(), new Integer(2));
assertEquals(it.next(), new Integer(3));
assertFalse(it.hasNext());
}
/**
* toString contains toStrings of elements
*/
public void testToString() {
PriorityQueue q = populatedQueue(SIZE);
String s = q.toString();
for (int i = 0; i < SIZE; ++i) {
assertTrue(s.indexOf(String.valueOf(i)) >= 0);
}
}
/**
* A deserialized serialized queue has same elements
*
TODO(tball): enable when serialization is supported.
public void testSerialization() {
PriorityQueue q = populatedQueue(SIZE);
try {
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));
PriorityQueue r = (PriorityQueue)in.readObject();
assertEquals(q.size(), r.size());
while (!q.isEmpty())
assertEquals(q.remove(), r.remove());
} catch(Exception e){
unexpectedException();
}
}
*/
}