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root/jsr166/jsr166/src/main/java/util/PriorityQueue.java

Comparing jsr166/src/main/java/util/PriorityQueue.java (file contents):
Revision 1.69 by jsr166, Sun May 18 23:59:57 2008 UTC vs.
Revision 1.70 by jsr166, Mon May 10 20:11:01 2010 UTC

#	Line 170 | Line 170 | public class PriorityQueue<E> extends Ab
170		* @throws NullPointerException if the specified collection or any
171		*         of its elements are null
172		*/
173	+	@SuppressWarnings("unchecked")
174		public PriorityQueue(Collection<? extends E> c) {
175	<	initFromCollection(c);
176	<	if (c instanceof SortedSet)
177	<	comparator = (Comparator<? super E>)
178	<	((SortedSet<? extends E>)c).comparator();
179	<	else if (c instanceof PriorityQueue)
180	<	comparator = (Comparator<? super E>)
181	<	((PriorityQueue<? extends E>)c).comparator();
175	>	if (c instanceof SortedSet<?>) {
176	>	SortedSet<? extends E> ss = (SortedSet<? extends E>) c;
177	>	this.comparator = (Comparator<? super E>) ss.comparator();
178	>	initElementsFromCollection(ss);
179	>	}
180	>	else if (c instanceof PriorityQueue<?>) {
181	>	PriorityQueue<? extends E> pq = (PriorityQueue<? extends E>) c;
182	>	this.comparator = (Comparator<? super E>) pq.comparator();
183	>	initFromPriorityQueue(pq);
184	>	}
185		else {
186	<	comparator = null;
187	<	heapify();
186	>	this.comparator = null;
187	>	initFromCollection(c);
188		}
189		}
190
#	Line 198 | Line 202 | public class PriorityQueue<E> extends Ab
202		* @throws NullPointerException if the specified priority queue or any
203		*         of its elements are null
204		*/
205	+	@SuppressWarnings("unchecked")
206		public PriorityQueue(PriorityQueue<? extends E> c) {
207	<	comparator = (Comparator<? super E>)c.comparator();
208	<	initFromCollection(c);
207	>	this.comparator = (Comparator<? super E>) c.comparator();
208	>	initFromPriorityQueue(c);
209		}
210
211		/**
#	Line 216 | Line 221 | public class PriorityQueue<E> extends Ab
221		* @throws NullPointerException if the specified sorted set or any
222		*         of its elements are null
223		*/
224	+	@SuppressWarnings("unchecked")
225		public PriorityQueue(SortedSet<? extends E> c) {
226	<	comparator = (Comparator<? super E>)c.comparator();
227	<	initFromCollection(c);
226	>	this.comparator = (Comparator<? super E>) c.comparator();
227	>	initElementsFromCollection(c);
228	>	}
229	>
230	>	private void initFromPriorityQueue(PriorityQueue<? extends E> c) {
231	>	if (c.getClass() == PriorityQueue.class) {
232	>	this.queue = c.toArray();
233	>	this.size = c.size();
234	>	} else {
235	>	initFromCollection(c);
236	>	}
237	>	}
238	>
239	>	private void initElementsFromCollection(Collection<? extends E> c) {
240	>	Object[] a = c.toArray();
241	>	// If c.toArray incorrectly doesn't return Object[], copy it.
242	>	if (a.getClass() != Object[].class)
243	>	a = Arrays.copyOf(a, a.length, Object[].class);
244	>	int len = a.length;
245	>	if (len == 1 || this.comparator != null)
246	>	for (int i = 0; i < len; i++)
247	>	if (a[i] == null)
248	>	throw new NullPointerException();
249	>	this.queue = a;
250	>	this.size = a.length;
251		}
252
253		/**
#	Line 227 | Line 256 | public class PriorityQueue<E> extends Ab
256		* @param c the collection
257		*/
258		private void initFromCollection(Collection<? extends E> c) {
259	<	Object[] a = c.toArray();
260	<	// If c.toArray incorrectly doesn't return Object[], copy it.
232	<	if (a.getClass() != Object[].class)
233	<	a = Arrays.copyOf(a, a.length, Object[].class);
234	<	queue = a;
235	<	size = a.length;
259	>	initElementsFromCollection(c);
260	>	heapify();
261		}
262
263		/**
264	+	* The maximum size of array to allocate.
265	+	* Some VMs reserve some header words in an array.
266	+	* Attempts to allocate larger arrays may result in
267	+	* OutOfMemoryError: Requested array size exceeds VM limit
268	+	*/
269	+	private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
270	+
271	+	/**
272		* Increases the capacity of the array.
273		*
274		* @param minCapacity the desired minimum capacity
275		*/
276		private void grow(int minCapacity) {
244	–	if (minCapacity < 0) // overflow
245	–	throw new OutOfMemoryError();
277		int oldCapacity = queue.length;
278		// Double size if small; else grow by 50%
279	<	int newCapacity = ((oldCapacity < 64)?
280	<	((oldCapacity + 1) * 2):
281	<	((oldCapacity / 2) * 3));
282	<	if (newCapacity < 0) // overflow
283	<	newCapacity = Integer.MAX_VALUE;
284	<	if (newCapacity < minCapacity)
254	<	newCapacity = minCapacity;
279	>	int newCapacity = oldCapacity + ((oldCapacity < 64) ?
280	>	(oldCapacity + 2) :
281	>	(oldCapacity >> 1));
282	>	// overflow-conscious code
283	>	if (newCapacity - MAX_ARRAY_SIZE > 0)
284	>	newCapacity = hugeCapacity(minCapacity);
285		queue = Arrays.copyOf(queue, newCapacity);
286		}
287
288	+	private static int hugeCapacity(int minCapacity) {
289	+	if (minCapacity < 0) // overflow
290	+	throw new OutOfMemoryError();
291	+	return (minCapacity > MAX_ARRAY_SIZE) ?
292	+	Integer.MAX_VALUE :
293	+	MAX_ARRAY_SIZE;
294	+	}
295	+
296		/**
297		* Inserts the specified element into this priority queue.
298		*

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