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import java.io.Serializable; |
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import java.util.function.Consumer; |
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import java.util.stream.Stream; |
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import java.util.function.Predicate; |
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import java.util.function.UnaryOperator; |
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/** |
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* Resizable-array implementation of the {@link Deque} interface. Array |
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* Java Collections Framework</a>. |
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* |
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* @author Josh Bloch and Doug Lea |
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* @since 1.6 |
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* @param <E> the type of elements held in this deque |
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* @since 1.6 |
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*/ |
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public class ArrayDeque<E> extends AbstractCollection<E> |
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implements Deque<E>, Cloneable, Serializable |
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{ |
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/** |
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* The array in which the elements of the deque are stored. |
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* The capacity of the deque is the length of this array, which is |
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* always a power of two. The array is never allowed to become |
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* full, except transiently within an addX method where it is |
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* resized (see doubleCapacity) immediately upon becoming full, |
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* thus avoiding head and tail wrapping around to equal each |
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* other. We also guarantee that all array cells not holding |
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* deque elements are always null. |
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* We guarantee that all array cells not holding deque elements |
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* are always null. |
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*/ |
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transient Object[] elements; // non-private to simplify nested class access |
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transient Object[] elements; |
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|
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/** |
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* The index of the element at the head of the deque (which is the |
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* element that would be removed by remove() or pop()); or an |
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* arbitrary number equal to tail if the deque is empty. |
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* arbitrary number 0 <= head < elements.length if the deque is empty. |
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*/ |
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transient int head; |
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|
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/** Number of elements in this collection. */ |
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transient int size; |
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|
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/** |
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* The index at which the next element would be added to the tail |
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* of the deque (via addLast(E), add(E), or push(E)). |
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* The maximum size of array to allocate. |
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* Some VMs reserve some header words in an array. |
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* Attempts to allocate larger arrays may result in |
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* OutOfMemoryError: Requested array size exceeds VM limit |
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*/ |
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transient int tail; |
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private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8; |
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|
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/** |
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* The minimum capacity that we'll use for a newly created deque. |
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* Must be a power of 2. |
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* Increases the capacity of this deque by at least the given amount. |
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* |
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* @param needed the required minimum extra capacity; must be positive |
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*/ |
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private static final int MIN_INITIAL_CAPACITY = 8; |
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private void grow(int needed) { |
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// overflow-conscious code |
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// checkInvariants(); |
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int oldCapacity = elements.length; |
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int newCapacity; |
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// Double size if small; else grow by 50% |
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int jump = (oldCapacity < 64) ? (oldCapacity + 2) : (oldCapacity >> 1); |
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if (jump < needed |
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|| (newCapacity = (oldCapacity + jump)) - MAX_ARRAY_SIZE > 0) |
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newCapacity = newCapacity(needed, jump); |
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elements = Arrays.copyOf(elements, newCapacity); |
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if (oldCapacity - head < size) { |
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// wrap around; slide first leg forward to end of array |
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int newSpace = newCapacity - oldCapacity; |
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System.arraycopy(elements, head, |
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elements, head + newSpace, |
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oldCapacity - head); |
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Arrays.fill(elements, head, head + newSpace, null); |
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head += newSpace; |
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} |
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// checkInvariants(); |
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} |
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|
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// ****** Array allocation and resizing utilities ****** |
116 |
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/** Capacity calculation for edge conditions, especially overflow. */ |
117 |
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private int newCapacity(int needed, int jump) { |
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int oldCapacity = elements.length; |
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int minCapacity; |
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if ((minCapacity = oldCapacity + needed) - MAX_ARRAY_SIZE > 0) { |
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if (minCapacity < 0) |
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throw new IllegalStateException("Sorry, deque too big"); |
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return Integer.MAX_VALUE; |
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} |
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if (needed > jump) |
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return minCapacity; |
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return (oldCapacity + jump - MAX_ARRAY_SIZE < 0) |
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? oldCapacity + jump |
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: MAX_ARRAY_SIZE; |
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} |
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|
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/** |
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* Allocates empty array to hold the given number of elements. |
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* Increases the internal storage of this collection, if necessary, |
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* to ensure that it can hold at least the given number of elements. |
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* |
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* @param numElements the number of elements to hold |
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* @param minCapacity the desired minimum capacity |
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*/ |
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private void allocateElements(int numElements) { |
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int initialCapacity = MIN_INITIAL_CAPACITY; |
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// Find the best power of two to hold elements. |
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// Tests "<=" because arrays aren't kept full. |
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if (numElements >= initialCapacity) { |
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initialCapacity = numElements; |
106 |
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initialCapacity |= (initialCapacity >>> 1); |
107 |
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initialCapacity |= (initialCapacity >>> 2); |
108 |
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initialCapacity |= (initialCapacity >>> 4); |
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initialCapacity |= (initialCapacity >>> 8); |
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initialCapacity |= (initialCapacity >>> 16); |
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initialCapacity++; |
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|
113 |
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if (initialCapacity < 0) // Too many elements, must back off |
114 |
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initialCapacity >>>= 1;// Good luck allocating 2 ^ 30 elements |
115 |
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} |
116 |
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elements = new Object[initialCapacity]; |
138 |
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/* TODO: public */ private void ensureCapacity(int minCapacity) { |
139 |
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if (minCapacity > elements.length) |
140 |
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grow(minCapacity - elements.length); |
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// checkInvariants(); |
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} |
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|
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/** |
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* Doubles the capacity of this deque. Call only when full, i.e., |
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* when head and tail have wrapped around to become equal. |
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* Minimizes the internal storage of this collection. |
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*/ |
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private void doubleCapacity() { |
148 |
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assert head == tail; |
149 |
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int p = head; |
150 |
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int n = elements.length; |
151 |
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int r = n - p; // number of elements to the right of p |
152 |
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int newCapacity = n << 1; |
129 |
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if (newCapacity < 0) |
130 |
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throw new IllegalStateException("Sorry, deque too big"); |
131 |
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Object[] a = new Object[newCapacity]; |
132 |
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System.arraycopy(elements, p, a, 0, r); |
133 |
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System.arraycopy(elements, 0, a, r, p); |
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elements = a; |
135 |
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head = 0; |
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tail = n; |
147 |
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/* TODO: public */ private void trimToSize() { |
148 |
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if (size < elements.length) { |
149 |
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elements = toArray(); |
150 |
> |
head = 0; |
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} |
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// checkInvariants(); |
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} |
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|
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/** |
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* Constructs an empty array deque with an initial capacity |
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* sufficient to hold the specified number of elements. |
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* |
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* @param numElements lower bound on initial capacity of the deque |
167 |
> |
* @param numElements lower bound on initial capacity of the deque |
168 |
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*/ |
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public ArrayDeque(int numElements) { |
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allocateElements(numElements); |
170 |
> |
elements = new Object[numElements]; |
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} |
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|
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/** |
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* @throws NullPointerException if the specified collection is null |
182 |
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*/ |
183 |
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public ArrayDeque(Collection<? extends E> c) { |
184 |
< |
allocateElements(c.size()); |
185 |
< |
addAll(c); |
184 |
> |
Object[] elements = c.toArray(); |
185 |
> |
// defend against c.toArray (incorrectly) not returning Object[] |
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> |
// (see e.g. https://bugs.openjdk.java.net/browse/JDK-6260652) |
187 |
> |
if (elements.getClass() != Object[].class) |
188 |
> |
elements = Arrays.copyOf(elements, size, Object[].class); |
189 |
> |
for (Object obj : elements) |
190 |
> |
Objects.requireNonNull(obj); |
191 |
> |
size = elements.length; |
192 |
> |
this.elements = elements; |
193 |
> |
} |
194 |
> |
|
195 |
> |
/** |
196 |
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* Increments i, mod modulus. |
197 |
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* Precondition and postcondition: 0 <= i < modulus. |
198 |
> |
*/ |
199 |
> |
static final int inc(int i, int modulus) { |
200 |
> |
if (++i == modulus) i = 0; |
201 |
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return i; |
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} |
203 |
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|
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/** |
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* Decrements i, mod modulus. |
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* Precondition and postcondition: 0 <= i < modulus. |
207 |
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*/ |
208 |
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static final int dec(int i, int modulus) { |
209 |
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if (--i < 0) i += modulus; |
210 |
> |
return i; |
211 |
> |
} |
212 |
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|
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/** |
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* Adds i and j, mod modulus. |
215 |
> |
* Precondition and postcondition: 0 <= i < modulus, 0 <= j <= modulus. |
216 |
> |
*/ |
217 |
> |
static final int add(int i, int j, int modulus) { |
218 |
> |
if ((i += j) - modulus >= 0) i -= modulus; |
219 |
> |
return i; |
220 |
> |
} |
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|
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> |
/** |
223 |
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* Returns the array index of the last element. |
224 |
> |
* May return invalid index -1 if there are no elements. |
225 |
> |
*/ |
226 |
> |
final int tail() { |
227 |
> |
return add(head, size - 1, elements.length); |
228 |
> |
} |
229 |
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|
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/** |
231 |
> |
* Returns element at array index i. |
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> |
*/ |
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> |
@SuppressWarnings("unchecked") |
234 |
> |
final E elementAt(int i) { |
235 |
> |
return (E) elements[i]; |
236 |
> |
} |
237 |
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|
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> |
/** |
239 |
> |
* A version of elementAt that checks for null elements. |
240 |
> |
* This check doesn't catch all possible comodifications, |
241 |
> |
* but does catch ones that corrupt traversal. |
242 |
> |
*/ |
243 |
> |
E checkedElementAt(Object[] elements, int i) { |
244 |
> |
@SuppressWarnings("unchecked") E e = (E) elements[i]; |
245 |
> |
if (e == null) |
246 |
> |
throw new ConcurrentModificationException(); |
247 |
> |
return e; |
248 |
|
} |
249 |
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|
250 |
|
// The main insertion and extraction methods are addFirst, |
258 |
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* @throws NullPointerException if the specified element is null |
259 |
|
*/ |
260 |
|
public void addFirst(E e) { |
261 |
< |
if (e == null) |
262 |
< |
throw new NullPointerException(); |
263 |
< |
elements[head = (head - 1) & (elements.length - 1)] = e; |
264 |
< |
if (head == tail) |
265 |
< |
doubleCapacity(); |
261 |
> |
// checkInvariants(); |
262 |
> |
Objects.requireNonNull(e); |
263 |
> |
Object[] elements; |
264 |
> |
int capacity, s = size; |
265 |
> |
while (s == (capacity = (elements = this.elements).length)) |
266 |
> |
grow(1); |
267 |
> |
elements[head = dec(head, capacity)] = e; |
268 |
> |
size = s + 1; |
269 |
|
} |
270 |
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|
271 |
|
/** |
277 |
|
* @throws NullPointerException if the specified element is null |
278 |
|
*/ |
279 |
|
public void addLast(E e) { |
280 |
< |
if (e == null) |
281 |
< |
throw new NullPointerException(); |
282 |
< |
elements[tail] = e; |
283 |
< |
if ( (tail = (tail + 1) & (elements.length - 1)) == head) |
284 |
< |
doubleCapacity(); |
280 |
> |
// checkInvariants(); |
281 |
> |
Objects.requireNonNull(e); |
282 |
> |
Object[] elements; |
283 |
> |
int capacity, s = size; |
284 |
> |
while (s == (capacity = (elements = this.elements).length)) |
285 |
> |
grow(1); |
286 |
> |
elements[add(head, s, capacity)] = e; |
287 |
> |
size = s + 1; |
288 |
> |
} |
289 |
> |
|
290 |
> |
/** |
291 |
> |
* Adds all of the elements in the specified collection at the end |
292 |
> |
* of this deque, as if by calling {@link #addLast} on each one, |
293 |
> |
* in the order that they are returned by the collection's |
294 |
> |
* iterator. |
295 |
> |
* |
296 |
> |
* @param c the elements to be inserted into this deque |
297 |
> |
* @return {@code true} if this deque changed as a result of the call |
298 |
> |
* @throws NullPointerException if the specified collection or any |
299 |
> |
* of its elements are null |
300 |
> |
*/ |
301 |
> |
@Override |
302 |
> |
public boolean addAll(Collection<? extends E> c) { |
303 |
> |
// checkInvariants(); |
304 |
> |
Object[] a, elements; |
305 |
> |
int newcomers, capacity, s = size; |
306 |
> |
if ((newcomers = (a = c.toArray()).length) == 0) |
307 |
> |
return false; |
308 |
> |
while ((capacity = (elements = this.elements).length) - s < newcomers) |
309 |
> |
grow(newcomers - (capacity - s)); |
310 |
> |
int i = add(head, s, capacity); |
311 |
> |
for (Object x : a) { |
312 |
> |
Objects.requireNonNull(x); |
313 |
> |
elements[i] = x; |
314 |
> |
i = inc(i, capacity); |
315 |
> |
size++; |
316 |
> |
} |
317 |
> |
return true; |
318 |
|
} |
319 |
|
|
320 |
|
/** |
345 |
|
* @throws NoSuchElementException {@inheritDoc} |
346 |
|
*/ |
347 |
|
public E removeFirst() { |
348 |
+ |
// checkInvariants(); |
349 |
|
E x = pollFirst(); |
350 |
|
if (x == null) |
351 |
|
throw new NoSuchElementException(); |
356 |
|
* @throws NoSuchElementException {@inheritDoc} |
357 |
|
*/ |
358 |
|
public E removeLast() { |
359 |
+ |
// checkInvariants(); |
360 |
|
E x = pollLast(); |
361 |
|
if (x == null) |
362 |
|
throw new NoSuchElementException(); |
364 |
|
} |
365 |
|
|
366 |
|
public E pollFirst() { |
367 |
< |
int h = head; |
368 |
< |
@SuppressWarnings("unchecked") |
369 |
< |
E result = (E) elements[h]; |
254 |
< |
// Element is null if deque empty |
255 |
< |
if (result == null) |
367 |
> |
// checkInvariants(); |
368 |
> |
final int s, h; |
369 |
> |
if ((s = size) == 0) |
370 |
|
return null; |
371 |
< |
elements[h] = null; // Must null out slot |
372 |
< |
head = (h + 1) & (elements.length - 1); |
373 |
< |
return result; |
371 |
> |
final Object[] elements = this.elements; |
372 |
> |
@SuppressWarnings("unchecked") E e = (E) elements[h = head]; |
373 |
> |
elements[h] = null; |
374 |
> |
head = inc(h, elements.length); |
375 |
> |
size = s - 1; |
376 |
> |
return e; |
377 |
|
} |
378 |
|
|
379 |
|
public E pollLast() { |
380 |
< |
int t = (tail - 1) & (elements.length - 1); |
381 |
< |
@SuppressWarnings("unchecked") |
382 |
< |
E result = (E) elements[t]; |
266 |
< |
if (result == null) |
380 |
> |
// checkInvariants(); |
381 |
> |
final int s, tail; |
382 |
> |
if ((s = size) == 0) |
383 |
|
return null; |
384 |
< |
elements[t] = null; |
385 |
< |
tail = t; |
386 |
< |
return result; |
384 |
> |
final Object[] elements = this.elements; |
385 |
> |
@SuppressWarnings("unchecked") |
386 |
> |
E e = (E) elements[tail = add(head, s - 1, elements.length)]; |
387 |
> |
elements[tail] = null; |
388 |
> |
size = s - 1; |
389 |
> |
return e; |
390 |
|
} |
391 |
|
|
392 |
|
/** |
393 |
|
* @throws NoSuchElementException {@inheritDoc} |
394 |
|
*/ |
395 |
|
public E getFirst() { |
396 |
< |
@SuppressWarnings("unchecked") |
397 |
< |
E result = (E) elements[head]; |
398 |
< |
if (result == null) |
280 |
< |
throw new NoSuchElementException(); |
281 |
< |
return result; |
396 |
> |
// checkInvariants(); |
397 |
> |
if (size == 0) throw new NoSuchElementException(); |
398 |
> |
return elementAt(head); |
399 |
|
} |
400 |
|
|
401 |
|
/** |
402 |
|
* @throws NoSuchElementException {@inheritDoc} |
403 |
|
*/ |
404 |
|
public E getLast() { |
405 |
< |
@SuppressWarnings("unchecked") |
406 |
< |
E result = (E) elements[(tail - 1) & (elements.length - 1)]; |
407 |
< |
if (result == null) |
291 |
< |
throw new NoSuchElementException(); |
292 |
< |
return result; |
405 |
> |
// checkInvariants(); |
406 |
> |
if (size == 0) throw new NoSuchElementException(); |
407 |
> |
return elementAt(tail()); |
408 |
|
} |
409 |
|
|
295 |
– |
@SuppressWarnings("unchecked") |
410 |
|
public E peekFirst() { |
411 |
< |
// elements[head] is null if deque empty |
412 |
< |
return (E) elements[head]; |
411 |
> |
// checkInvariants(); |
412 |
> |
return (size == 0) ? null : elementAt(head); |
413 |
|
} |
414 |
|
|
301 |
– |
@SuppressWarnings("unchecked") |
415 |
|
public E peekLast() { |
416 |
< |
return (E) elements[(tail - 1) & (elements.length - 1)]; |
416 |
> |
// checkInvariants(); |
417 |
> |
return (size == 0) ? null : elementAt(tail()); |
418 |
|
} |
419 |
|
|
420 |
|
/** |
430 |
|
* @return {@code true} if the deque contained the specified element |
431 |
|
*/ |
432 |
|
public boolean removeFirstOccurrence(Object o) { |
433 |
+ |
// checkInvariants(); |
434 |
|
if (o != null) { |
435 |
< |
int mask = elements.length - 1; |
436 |
< |
int i = head; |
437 |
< |
for (Object x; (x = elements[i]) != null; i = (i + 1) & mask) { |
438 |
< |
if (o.equals(x)) { |
435 |
> |
final Object[] elements = this.elements; |
436 |
> |
final int capacity = elements.length; |
437 |
> |
for (int k = size, i = head; --k >= 0; i = inc(i, capacity)) { |
438 |
> |
if (o.equals(elements[i])) { |
439 |
|
delete(i); |
440 |
|
return true; |
441 |
|
} |
458 |
|
*/ |
459 |
|
public boolean removeLastOccurrence(Object o) { |
460 |
|
if (o != null) { |
461 |
< |
int mask = elements.length - 1; |
462 |
< |
int i = (tail - 1) & mask; |
463 |
< |
for (Object x; (x = elements[i]) != null; i = (i - 1) & mask) { |
464 |
< |
if (o.equals(x)) { |
461 |
> |
final Object[] elements = this.elements; |
462 |
> |
final int capacity = elements.length; |
463 |
> |
for (int k = size, i = add(head, k - 1, capacity); |
464 |
> |
--k >= 0; i = dec(i, capacity)) { |
465 |
> |
if (o.equals(elements[i])) { |
466 |
|
delete(i); |
467 |
|
return true; |
468 |
|
} |
585 |
|
return removeFirst(); |
586 |
|
} |
587 |
|
|
472 |
– |
private void checkInvariants() { |
473 |
– |
assert elements[tail] == null; |
474 |
– |
assert head == tail ? elements[head] == null : |
475 |
– |
(elements[head] != null && |
476 |
– |
elements[(tail - 1) & (elements.length - 1)] != null); |
477 |
– |
assert elements[(head - 1) & (elements.length - 1)] == null; |
478 |
– |
} |
479 |
– |
|
588 |
|
/** |
589 |
< |
* Removes the element at the specified position in the elements array, |
590 |
< |
* adjusting head and tail as necessary. This can result in motion of |
591 |
< |
* elements backwards or forwards in the array. |
589 |
> |
* Removes the element at the specified position in the elements array. |
590 |
> |
* This can result in forward or backwards motion of array elements. |
591 |
> |
* We optimize for least element motion. |
592 |
|
* |
593 |
|
* <p>This method is called delete rather than remove to emphasize |
594 |
|
* that its semantics differ from those of {@link List#remove(int)}. |
595 |
|
* |
596 |
|
* @return true if elements moved backwards |
597 |
|
*/ |
598 |
< |
private boolean delete(int i) { |
599 |
< |
checkInvariants(); |
598 |
> |
boolean delete(int i) { |
599 |
> |
// checkInvariants(); |
600 |
|
final Object[] elements = this.elements; |
601 |
< |
final int mask = elements.length - 1; |
601 |
> |
final int capacity = elements.length; |
602 |
|
final int h = head; |
603 |
< |
final int t = tail; |
604 |
< |
final int front = (i - h) & mask; |
605 |
< |
final int back = (t - i) & mask; |
498 |
< |
|
499 |
< |
// Invariant: head <= i < tail mod circularity |
500 |
< |
if (front >= ((t - h) & mask)) |
501 |
< |
throw new ConcurrentModificationException(); |
502 |
< |
|
503 |
< |
// Optimize for least element motion |
603 |
> |
int front; // number of elements before to-be-deleted elt |
604 |
> |
if ((front = i - h) < 0) front += capacity; |
605 |
> |
final int back = size - front - 1; // number of elements after |
606 |
|
if (front < back) { |
607 |
+ |
// move front elements forwards |
608 |
|
if (h <= i) { |
609 |
|
System.arraycopy(elements, h, elements, h + 1, front); |
610 |
|
} else { // Wrap around |
611 |
|
System.arraycopy(elements, 0, elements, 1, i); |
612 |
< |
elements[0] = elements[mask]; |
613 |
< |
System.arraycopy(elements, h, elements, h + 1, mask - h); |
612 |
> |
elements[0] = elements[capacity - 1]; |
613 |
> |
System.arraycopy(elements, h, elements, h + 1, front - (i + 1)); |
614 |
|
} |
615 |
|
elements[h] = null; |
616 |
< |
head = (h + 1) & mask; |
616 |
> |
head = inc(h, capacity); |
617 |
> |
size--; |
618 |
> |
// checkInvariants(); |
619 |
|
return false; |
620 |
|
} else { |
621 |
< |
if (i < t) { // Copy the null tail as well |
621 |
> |
// move back elements backwards |
622 |
> |
int tail = tail(); |
623 |
> |
if (i <= tail) { |
624 |
|
System.arraycopy(elements, i + 1, elements, i, back); |
518 |
– |
tail = t - 1; |
625 |
|
} else { // Wrap around |
626 |
< |
System.arraycopy(elements, i + 1, elements, i, mask - i); |
627 |
< |
elements[mask] = elements[0]; |
628 |
< |
System.arraycopy(elements, 1, elements, 0, t); |
629 |
< |
tail = (t - 1) & mask; |
626 |
> |
int firstLeg = capacity - (i + 1); |
627 |
> |
System.arraycopy(elements, i + 1, elements, i, firstLeg); |
628 |
> |
elements[capacity - 1] = elements[0]; |
629 |
> |
System.arraycopy(elements, 1, elements, 0, back - firstLeg - 1); |
630 |
|
} |
631 |
+ |
elements[tail] = null; |
632 |
+ |
size--; |
633 |
+ |
// checkInvariants(); |
634 |
|
return true; |
635 |
|
} |
636 |
|
} |
643 |
|
* @return the number of elements in this deque |
644 |
|
*/ |
645 |
|
public int size() { |
646 |
< |
return (tail - head) & (elements.length - 1); |
646 |
> |
return size; |
647 |
|
} |
648 |
|
|
649 |
|
/** |
652 |
|
* @return {@code true} if this deque contains no elements |
653 |
|
*/ |
654 |
|
public boolean isEmpty() { |
655 |
< |
return head == tail; |
655 |
> |
return size == 0; |
656 |
|
} |
657 |
|
|
658 |
|
/** |
672 |
|
} |
673 |
|
|
674 |
|
private class DeqIterator implements Iterator<E> { |
675 |
< |
/** |
676 |
< |
* Index of element to be returned by subsequent call to next. |
568 |
< |
*/ |
569 |
< |
private int cursor = head; |
675 |
> |
/** Index of element to be returned by subsequent call to next. */ |
676 |
> |
int cursor; |
677 |
|
|
678 |
< |
/** |
679 |
< |
* Tail recorded at construction (also in remove), to stop |
573 |
< |
* iterator and also to check for comodification. |
574 |
< |
*/ |
575 |
< |
private int fence = tail; |
678 |
> |
/** Number of elements yet to be returned. */ |
679 |
> |
int remaining = size; |
680 |
|
|
681 |
|
/** |
682 |
|
* Index of element returned by most recent call to next. |
683 |
|
* Reset to -1 if element is deleted by a call to remove. |
684 |
|
*/ |
685 |
< |
private int lastRet = -1; |
685 |
> |
int lastRet = -1; |
686 |
> |
|
687 |
> |
DeqIterator() { cursor = head; } |
688 |
> |
|
689 |
> |
int advance(int i, int modulus) { |
690 |
> |
return inc(i, modulus); |
691 |
> |
} |
692 |
> |
|
693 |
> |
void doRemove() { |
694 |
> |
if (delete(lastRet)) |
695 |
> |
// if left-shifted, undo advance in next() |
696 |
> |
cursor = dec(cursor, elements.length); |
697 |
> |
} |
698 |
|
|
699 |
< |
public boolean hasNext() { |
700 |
< |
return cursor != fence; |
699 |
> |
public final boolean hasNext() { |
700 |
> |
return remaining > 0; |
701 |
|
} |
702 |
|
|
703 |
< |
public E next() { |
704 |
< |
if (cursor == fence) |
703 |
> |
public final E next() { |
704 |
> |
if (remaining == 0) |
705 |
|
throw new NoSuchElementException(); |
706 |
< |
@SuppressWarnings("unchecked") |
591 |
< |
E result = (E) elements[cursor]; |
592 |
< |
// This check doesn't catch all possible comodifications, |
593 |
< |
// but does catch the ones that corrupt traversal |
594 |
< |
if (tail != fence || result == null) |
595 |
< |
throw new ConcurrentModificationException(); |
706 |
> |
E e = checkedElementAt(elements, cursor); |
707 |
|
lastRet = cursor; |
708 |
< |
cursor = (cursor + 1) & (elements.length - 1); |
709 |
< |
return result; |
708 |
> |
cursor = advance(cursor, elements.length); |
709 |
> |
remaining--; |
710 |
> |
return e; |
711 |
|
} |
712 |
|
|
713 |
< |
public void remove() { |
713 |
> |
public final void remove() { |
714 |
|
if (lastRet < 0) |
715 |
|
throw new IllegalStateException(); |
716 |
< |
if (delete(lastRet)) { // if left-shifted, undo increment in next() |
605 |
< |
cursor = (cursor - 1) & (elements.length - 1); |
606 |
< |
fence = tail; |
607 |
< |
} |
716 |
> |
doRemove(); |
717 |
|
lastRet = -1; |
718 |
|
} |
719 |
+ |
|
720 |
+ |
public final void forEachRemaining(Consumer<? super E> action) { |
721 |
+ |
Objects.requireNonNull(action); |
722 |
+ |
final Object[] elements = ArrayDeque.this.elements; |
723 |
+ |
final int capacity = elements.length; |
724 |
+ |
int k = remaining; |
725 |
+ |
remaining = 0; |
726 |
+ |
for (int i = cursor; --k >= 0; i = advance(i, capacity)) |
727 |
+ |
action.accept(checkedElementAt(elements, i)); |
728 |
+ |
} |
729 |
+ |
} |
730 |
+ |
|
731 |
+ |
private class DescendingIterator extends DeqIterator { |
732 |
+ |
DescendingIterator() { cursor = tail(); } |
733 |
+ |
|
734 |
+ |
@Override int advance(int i, int modulus) { |
735 |
+ |
return dec(i, modulus); |
736 |
+ |
} |
737 |
+ |
|
738 |
+ |
@Override void doRemove() { |
739 |
+ |
if (!delete(lastRet)) |
740 |
+ |
// if right-shifted, undo advance in next |
741 |
+ |
cursor = inc(cursor, elements.length); |
742 |
+ |
} |
743 |
|
} |
744 |
|
|
745 |
|
/** |
746 |
< |
* This class is nearly a mirror-image of DeqIterator, using tail |
747 |
< |
* instead of head for initial cursor, and head instead of tail |
748 |
< |
* for fence. |
746 |
> |
* Creates a <em><a href="Spliterator.html#binding">late-binding</a></em> |
747 |
> |
* and <em>fail-fast</em> {@link Spliterator} over the elements in this |
748 |
> |
* deque. |
749 |
> |
* |
750 |
> |
* <p>The {@code Spliterator} reports {@link Spliterator#SIZED}, |
751 |
> |
* {@link Spliterator#SUBSIZED}, {@link Spliterator#ORDERED}, and |
752 |
> |
* {@link Spliterator#NONNULL}. Overriding implementations should document |
753 |
> |
* the reporting of additional characteristic values. |
754 |
> |
* |
755 |
> |
* @return a {@code Spliterator} over the elements in this deque |
756 |
> |
* @since 1.8 |
757 |
|
*/ |
758 |
< |
private class DescendingIterator implements Iterator<E> { |
759 |
< |
private int cursor = tail; |
760 |
< |
private int fence = head; |
761 |
< |
private int lastRet = -1; |
758 |
> |
public Spliterator<E> spliterator() { |
759 |
> |
return new ArrayDequeSpliterator(); |
760 |
> |
} |
761 |
> |
|
762 |
> |
final class ArrayDequeSpliterator implements Spliterator<E> { |
763 |
> |
private int cursor; |
764 |
> |
private int remaining; // -1 until late-binding first use |
765 |
|
|
766 |
< |
public boolean hasNext() { |
767 |
< |
return cursor != fence; |
766 |
> |
/** Constructs late-binding spliterator over all elements. */ |
767 |
> |
ArrayDequeSpliterator() { |
768 |
> |
this.remaining = -1; |
769 |
|
} |
770 |
|
|
771 |
< |
public E next() { |
772 |
< |
if (cursor == fence) |
773 |
< |
throw new NoSuchElementException(); |
774 |
< |
cursor = (cursor - 1) & (elements.length - 1); |
630 |
< |
@SuppressWarnings("unchecked") |
631 |
< |
E result = (E) elements[cursor]; |
632 |
< |
if (head != fence || result == null) |
633 |
< |
throw new ConcurrentModificationException(); |
634 |
< |
lastRet = cursor; |
635 |
< |
return result; |
771 |
> |
/** Constructs spliterator over the given slice. */ |
772 |
> |
ArrayDequeSpliterator(int cursor, int count) { |
773 |
> |
this.cursor = cursor; |
774 |
> |
this.remaining = count; |
775 |
|
} |
776 |
|
|
777 |
< |
public void remove() { |
778 |
< |
if (lastRet < 0) |
779 |
< |
throw new IllegalStateException(); |
780 |
< |
if (!delete(lastRet)) { |
781 |
< |
cursor = (cursor + 1) & (elements.length - 1); |
643 |
< |
fence = head; |
777 |
> |
/** Ensures late-binding initialization; then returns remaining. */ |
778 |
> |
private int remaining() { |
779 |
> |
if (remaining < 0) { |
780 |
> |
cursor = head; |
781 |
> |
remaining = size; |
782 |
|
} |
783 |
< |
lastRet = -1; |
783 |
> |
return remaining; |
784 |
> |
} |
785 |
> |
|
786 |
> |
public ArrayDequeSpliterator trySplit() { |
787 |
> |
final int mid; |
788 |
> |
if ((mid = remaining() >> 1) > 0) { |
789 |
> |
int oldCursor = cursor; |
790 |
> |
cursor = add(cursor, mid, elements.length); |
791 |
> |
remaining -= mid; |
792 |
> |
return new ArrayDequeSpliterator(oldCursor, mid); |
793 |
> |
} |
794 |
> |
return null; |
795 |
> |
} |
796 |
> |
|
797 |
> |
public void forEachRemaining(Consumer<? super E> action) { |
798 |
> |
Objects.requireNonNull(action); |
799 |
> |
final Object[] elements = ArrayDeque.this.elements; |
800 |
> |
final int capacity = elements.length; |
801 |
> |
int k = remaining(); |
802 |
> |
remaining = 0; |
803 |
> |
for (int i = cursor; --k >= 0; i = inc(i, capacity)) |
804 |
> |
action.accept(checkedElementAt(elements, i)); |
805 |
> |
} |
806 |
> |
|
807 |
> |
public boolean tryAdvance(Consumer<? super E> action) { |
808 |
> |
Objects.requireNonNull(action); |
809 |
> |
if (remaining() == 0) |
810 |
> |
return false; |
811 |
> |
action.accept(checkedElementAt(elements, cursor)); |
812 |
> |
cursor = inc(cursor, elements.length); |
813 |
> |
remaining--; |
814 |
> |
return true; |
815 |
> |
} |
816 |
> |
|
817 |
> |
public long estimateSize() { |
818 |
> |
return remaining(); |
819 |
> |
} |
820 |
> |
|
821 |
> |
public int characteristics() { |
822 |
> |
return Spliterator.NONNULL |
823 |
> |
| Spliterator.ORDERED |
824 |
> |
| Spliterator.SIZED |
825 |
> |
| Spliterator.SUBSIZED; |
826 |
> |
} |
827 |
> |
} |
828 |
> |
|
829 |
> |
@Override |
830 |
> |
public void forEach(Consumer<? super E> action) { |
831 |
> |
// checkInvariants(); |
832 |
> |
Objects.requireNonNull(action); |
833 |
> |
final Object[] elements = this.elements; |
834 |
> |
final int capacity = elements.length; |
835 |
> |
for (int k = size, i = head; --k >= 0; i = inc(i, capacity)) |
836 |
> |
action.accept(elementAt(i)); |
837 |
> |
// checkInvariants(); |
838 |
> |
} |
839 |
> |
|
840 |
> |
/** |
841 |
> |
* Replaces each element of this deque with the result of applying the |
842 |
> |
* operator to that element, as specified by {@link List#replaceAll}. |
843 |
> |
* |
844 |
> |
* @param operator the operator to apply to each element |
845 |
> |
*/ |
846 |
> |
/* TODO: public */ private void replaceAll(UnaryOperator<E> operator) { |
847 |
> |
Objects.requireNonNull(operator); |
848 |
> |
final Object[] elements = this.elements; |
849 |
> |
final int capacity = elements.length; |
850 |
> |
for (int k = size, i = head; --k >= 0; i = inc(i, capacity)) |
851 |
> |
elements[i] = operator.apply(elementAt(i)); |
852 |
> |
// checkInvariants(); |
853 |
> |
} |
854 |
> |
|
855 |
> |
/** |
856 |
> |
* @throws NullPointerException {@inheritDoc} |
857 |
> |
*/ |
858 |
> |
@Override |
859 |
> |
public boolean removeIf(Predicate<? super E> filter) { |
860 |
> |
Objects.requireNonNull(filter); |
861 |
> |
return bulkRemove(filter); |
862 |
> |
} |
863 |
> |
|
864 |
> |
/** |
865 |
> |
* @throws NullPointerException {@inheritDoc} |
866 |
> |
*/ |
867 |
> |
@Override |
868 |
> |
public boolean removeAll(Collection<?> c) { |
869 |
> |
Objects.requireNonNull(c); |
870 |
> |
return bulkRemove(e -> c.contains(e)); |
871 |
> |
} |
872 |
> |
|
873 |
> |
/** |
874 |
> |
* @throws NullPointerException {@inheritDoc} |
875 |
> |
*/ |
876 |
> |
@Override |
877 |
> |
public boolean retainAll(Collection<?> c) { |
878 |
> |
Objects.requireNonNull(c); |
879 |
> |
return bulkRemove(e -> !c.contains(e)); |
880 |
> |
} |
881 |
> |
|
882 |
> |
/** Implementation of bulk remove methods. */ |
883 |
> |
private boolean bulkRemove(Predicate<? super E> filter) { |
884 |
> |
// checkInvariants(); |
885 |
> |
final Object[] elements = this.elements; |
886 |
> |
final int capacity = elements.length; |
887 |
> |
int i = head, j = i, remaining = size, deleted = 0; |
888 |
> |
try { |
889 |
> |
for (; remaining > 0; remaining--, i = inc(i, capacity)) { |
890 |
> |
@SuppressWarnings("unchecked") E e = (E) elements[i]; |
891 |
> |
if (filter.test(e)) |
892 |
> |
deleted++; |
893 |
> |
else { |
894 |
> |
if (j != i) |
895 |
> |
elements[j] = e; |
896 |
> |
j = inc(j, capacity); |
897 |
> |
} |
898 |
> |
} |
899 |
> |
return deleted > 0; |
900 |
> |
} catch (Throwable ex) { |
901 |
> |
if (deleted > 0) |
902 |
> |
for (; remaining > 0; |
903 |
> |
remaining--, i = inc(i, capacity), j = inc(j, capacity)) |
904 |
> |
elements[j] = elements[i]; |
905 |
> |
throw ex; |
906 |
> |
} finally { |
907 |
> |
size -= deleted; |
908 |
> |
for (; --deleted >= 0; j = inc(j, capacity)) |
909 |
> |
elements[j] = null; |
910 |
> |
// checkInvariants(); |
911 |
|
} |
912 |
|
} |
913 |
|
|
921 |
|
*/ |
922 |
|
public boolean contains(Object o) { |
923 |
|
if (o != null) { |
924 |
< |
int mask = elements.length - 1; |
925 |
< |
int i = head; |
926 |
< |
for (Object x; (x = elements[i]) != null; i = (i + 1) & mask) { |
927 |
< |
if (o.equals(x)) |
924 |
> |
final Object[] elements = this.elements; |
925 |
> |
final int capacity = elements.length; |
926 |
> |
for (int k = size, i = head; --k >= 0; i = inc(i, capacity)) |
927 |
> |
if (o.equals(elements[i])) |
928 |
|
return true; |
664 |
– |
} |
929 |
|
} |
930 |
|
return false; |
931 |
|
} |
952 |
|
* The deque will be empty after this call returns. |
953 |
|
*/ |
954 |
|
public void clear() { |
955 |
< |
int h = head; |
956 |
< |
int t = tail; |
957 |
< |
if (h != t) { // clear all cells |
958 |
< |
head = tail = 0; |
959 |
< |
int i = h; |
960 |
< |
int mask = elements.length - 1; |
961 |
< |
do { |
962 |
< |
elements[i] = null; |
963 |
< |
i = (i + 1) & mask; |
700 |
< |
} while (i != t); |
955 |
> |
final Object[] elements = this.elements; |
956 |
> |
final int capacity = elements.length; |
957 |
> |
final int h = this.head; |
958 |
> |
final int s = size; |
959 |
> |
if (capacity - h >= s) |
960 |
> |
Arrays.fill(elements, h, h + s, null); |
961 |
> |
else { |
962 |
> |
Arrays.fill(elements, h, capacity, null); |
963 |
> |
Arrays.fill(elements, 0, s - capacity + h, null); |
964 |
|
} |
965 |
+ |
size = head = 0; |
966 |
+ |
// checkInvariants(); |
967 |
|
} |
968 |
|
|
969 |
|
/** |
981 |
|
*/ |
982 |
|
public Object[] toArray() { |
983 |
|
final int head = this.head; |
984 |
< |
final int tail = this.tail; |
985 |
< |
boolean wrap = (tail < head); |
986 |
< |
int end = wrap ? tail + elements.length : tail; |
987 |
< |
Object[] a = Arrays.copyOfRange(elements, head, end); |
723 |
< |
if (wrap) |
724 |
< |
System.arraycopy(elements, 0, a, elements.length - head, tail); |
984 |
> |
final int firstLeg; |
985 |
> |
Object[] a = Arrays.copyOfRange(elements, head, head + size); |
986 |
> |
if ((firstLeg = elements.length - head) < size) |
987 |
> |
System.arraycopy(elements, 0, a, firstLeg, size - firstLeg); |
988 |
|
return a; |
989 |
|
} |
990 |
|
|
1010 |
|
* The following code can be used to dump the deque into a newly |
1011 |
|
* allocated array of {@code String}: |
1012 |
|
* |
1013 |
< |
* <pre> {@code String[] y = x.toArray(new String[0]);}</pre> |
1013 |
> |
* <pre> {@code String[] y = x.toArray(new String[0]);}</pre> |
1014 |
|
* |
1015 |
|
* Note that {@code toArray(new Object[0])} is identical in function to |
1016 |
|
* {@code toArray()}. |
1026 |
|
*/ |
1027 |
|
@SuppressWarnings("unchecked") |
1028 |
|
public <T> T[] toArray(T[] a) { |
1029 |
+ |
final Object[] elements = this.elements; |
1030 |
|
final int head = this.head; |
1031 |
< |
final int tail = this.tail; |
1032 |
< |
boolean wrap = (tail < head); |
1033 |
< |
int size = (tail - head) + (wrap ? elements.length : 0); |
770 |
< |
int firstLeg = size - (wrap ? tail : 0); |
771 |
< |
int len = a.length; |
772 |
< |
if (size > len) { |
1031 |
> |
final int firstLeg; |
1032 |
> |
boolean wrap = (firstLeg = elements.length - head) < size; |
1033 |
> |
if (size > a.length) { |
1034 |
|
a = (T[]) Arrays.copyOfRange(elements, head, head + size, |
1035 |
|
a.getClass()); |
1036 |
|
} else { |
1037 |
< |
System.arraycopy(elements, head, a, 0, firstLeg); |
1038 |
< |
if (size < len) |
1037 |
> |
System.arraycopy(elements, head, a, 0, wrap ? firstLeg : size); |
1038 |
> |
if (size < a.length) |
1039 |
|
a[size] = null; |
1040 |
|
} |
1041 |
|
if (wrap) |
1042 |
< |
System.arraycopy(elements, 0, a, firstLeg, tail); |
1042 |
> |
System.arraycopy(elements, 0, a, firstLeg, size - firstLeg); |
1043 |
|
return a; |
1044 |
|
} |
1045 |
|
|
1077 |
|
s.defaultWriteObject(); |
1078 |
|
|
1079 |
|
// Write out size |
1080 |
< |
s.writeInt(size()); |
1080 |
> |
s.writeInt(size); |
1081 |
|
|
1082 |
|
// Write out elements in order. |
1083 |
< |
int mask = elements.length - 1; |
1084 |
< |
for (int i = head; i != tail; i = (i + 1) & mask) |
1083 |
> |
final Object[] elements = this.elements; |
1084 |
> |
final int capacity = elements.length; |
1085 |
> |
for (int k = size, i = head; --k >= 0; i = inc(i, capacity)) |
1086 |
|
s.writeObject(elements[i]); |
1087 |
|
} |
1088 |
|
|
1098 |
|
s.defaultReadObject(); |
1099 |
|
|
1100 |
|
// Read in size and allocate array |
1101 |
< |
int size = s.readInt(); |
840 |
< |
allocateElements(size); |
841 |
< |
head = 0; |
842 |
< |
tail = size; |
1101 |
> |
elements = new Object[size = s.readInt()]; |
1102 |
|
|
1103 |
|
// Read in all elements in the proper order. |
1104 |
|
for (int i = 0; i < size; i++) |
1105 |
|
elements[i] = s.readObject(); |
1106 |
|
} |
1107 |
|
|
1108 |
< |
public Spliterator<E> spliterator() { |
1109 |
< |
return new DeqSpliterator<E>(this, -1, -1); |
1110 |
< |
} |
1111 |
< |
|
1112 |
< |
static final class DeqSpliterator<E> implements Spliterator<E> { |
1113 |
< |
private final ArrayDeque<E> deq; |
1114 |
< |
private int fence; // -1 until first use |
1115 |
< |
private int index; // current index, modified on traverse/split |
1116 |
< |
|
1117 |
< |
/** Creates new spliterator covering the given array and range */ |
1118 |
< |
DeqSpliterator(ArrayDeque<E> deq, int origin, int fence) { |
1119 |
< |
this.deq = deq; |
1120 |
< |
this.index = origin; |
1121 |
< |
this.fence = fence; |
1122 |
< |
} |
1123 |
< |
|
1124 |
< |
private int getFence() { // force initialization |
1125 |
< |
int t; |
867 |
< |
if ((t = fence) < 0) { |
868 |
< |
t = fence = deq.tail; |
869 |
< |
index = deq.head; |
870 |
< |
} |
871 |
< |
return t; |
872 |
< |
} |
873 |
< |
|
874 |
< |
public Spliterator<E> trySplit() { |
875 |
< |
int t = getFence(), h = index, n = deq.elements.length; |
876 |
< |
if (h != t && ((h + 1) & (n - 1)) != t) { |
877 |
< |
if (h > t) |
878 |
< |
t += n; |
879 |
< |
int m = ((h + t) >>> 1) & (n - 1); |
880 |
< |
return new DeqSpliterator<>(deq, h, index = m); |
881 |
< |
} |
882 |
< |
return null; |
883 |
< |
} |
884 |
< |
|
885 |
< |
public void forEachRemaining(Consumer<? super E> consumer) { |
886 |
< |
if (consumer == null) |
887 |
< |
throw new NullPointerException(); |
888 |
< |
Object[] a = deq.elements; |
889 |
< |
int m = a.length - 1, f = getFence(), i = index; |
890 |
< |
index = f; |
891 |
< |
while (i != f) { |
892 |
< |
@SuppressWarnings("unchecked") E e = (E)a[i]; |
893 |
< |
i = (i + 1) & m; |
894 |
< |
if (e == null) |
895 |
< |
throw new ConcurrentModificationException(); |
896 |
< |
consumer.accept(e); |
897 |
< |
} |
898 |
< |
} |
899 |
< |
|
900 |
< |
public boolean tryAdvance(Consumer<? super E> consumer) { |
901 |
< |
if (consumer == null) |
902 |
< |
throw new NullPointerException(); |
903 |
< |
Object[] a = deq.elements; |
904 |
< |
int m = a.length - 1, f = getFence(), i = index; |
905 |
< |
if (i != fence) { |
906 |
< |
@SuppressWarnings("unchecked") E e = (E)a[i]; |
907 |
< |
index = (i + 1) & m; |
908 |
< |
if (e == null) |
909 |
< |
throw new ConcurrentModificationException(); |
910 |
< |
consumer.accept(e); |
911 |
< |
return true; |
912 |
< |
} |
913 |
< |
return false; |
914 |
< |
} |
915 |
< |
|
916 |
< |
public long estimateSize() { |
917 |
< |
int n = getFence() - index; |
918 |
< |
if (n < 0) |
919 |
< |
n += deq.elements.length; |
920 |
< |
return (long) n; |
921 |
< |
} |
922 |
< |
|
923 |
< |
@Override |
924 |
< |
public int characteristics() { |
925 |
< |
return Spliterator.ORDERED | Spliterator.SIZED | |
926 |
< |
Spliterator.NONNULL | Spliterator.SUBSIZED; |
1108 |
> |
/** debugging */ |
1109 |
> |
private void checkInvariants() { |
1110 |
> |
try { |
1111 |
> |
int capacity = elements.length; |
1112 |
> |
assert size >= 0 && size <= capacity; |
1113 |
> |
assert head >= 0 && ((capacity == 0 && head == 0 && size == 0) |
1114 |
> |
|| head < capacity); |
1115 |
> |
assert size == 0 |
1116 |
> |
|| (elements[head] != null && elements[tail()] != null); |
1117 |
> |
assert size == capacity |
1118 |
> |
|| (elements[dec(head, capacity)] == null |
1119 |
> |
&& elements[inc(tail(), capacity)] == null); |
1120 |
> |
} catch (Throwable t) { |
1121 |
> |
System.err.printf("head=%d size=%d capacity=%d%n", |
1122 |
> |
head, size, elements.length); |
1123 |
> |
System.err.printf("elements=%s%n", |
1124 |
> |
Arrays.toString(elements)); |
1125 |
> |
throw t; |
1126 |
|
} |
1127 |
|
} |
1128 |
|
|