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1.1 |
/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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package jsr166e.extra; |
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import jsr166e.*; |
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import java.util.*; |
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/** |
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1.2 |
* A class with the same methods and array-based characteristics as |
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* {@link java.util.Vector} but with reduced contention and improved |
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1.1 |
* throughput when invocations of read-only methods by multiple |
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1.2 |
* threads are most common. |
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1.1 |
* |
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* <p> The iterators returned by this class's {@link #iterator() |
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* iterator} and {@link #listIterator(int) listIterator} methods are |
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* best-effort in the presence of concurrent modifications, and do |
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* <em>NOT</em> throw {@link ConcurrentModificationException}. An |
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* iterator's {@code next()} method returns consecutive elements as |
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* they appear in the underlying array upon each access. |
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* |
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* <p>Otherwise, this class supports all methods, under the same |
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* documented specifications, as {@code Vector}. Consult {@link |
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* java.util.Vector} for detailed specifications. Additionally, this |
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* class provides methods {@link #addIfAbsent} and {@link |
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* #addAllAbsent}. |
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* |
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* @author Doug Lea |
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*/ |
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public class ReadMostlyVector<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable { |
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private static final long serialVersionUID = 8673264195747942595L; |
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/* |
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* This class exists mainly as a vehicle to exercise various |
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1.2 |
* constructions using SequenceLocks. Read-only methods |
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* take one of a few forms: |
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* |
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* Short methods,including get(index), continually retry obtaining |
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* a snapshot of array, count, and element, using sequence number |
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* to validate. |
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* |
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* Methods that are potentially O(n) (or worse) try once in |
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* read-only mode, and then lock. When in read-only mode, they |
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* validate only at the end of an array scan unless the element is |
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* actually used (for example, as an argument of method equals). |
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1.1 |
*/ |
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/** |
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* The maximum size of array to allocate. |
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* See CopyOnWriteArrayList for explanation. |
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*/ |
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private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8; |
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// fields are non-private to simpify nested class access |
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Object[] array; |
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final SequenceLock lock; |
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int count; |
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final int capacityIncrement; |
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/** |
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* Creates an empty vector with the given initial capacity and |
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* capacity increment. |
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* |
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* @param initialCapacity the initial capacity of the underlying array |
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* @param capacityIncrement if non-zero, the number to |
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* add when resizing to accommodate additional elements. |
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* If zero, the array size is doubled when resized. |
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* |
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* @throws IllegalArgumentException if initial capacity is negative |
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*/ |
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public ReadMostlyVector(int initialCapacity, int capacityIncrement) { |
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super(); |
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if (initialCapacity < 0) |
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throw new IllegalArgumentException("Illegal Capacity: "+ |
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initialCapacity); |
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this.array = new Object[initialCapacity]; |
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this.capacityIncrement = capacityIncrement; |
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this.lock = new SequenceLock(); |
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} |
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/** |
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* Creates an empty vector with the given initial capacity. |
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* |
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* @param initialCapacity the initial capacity of the underlying array |
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* |
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* @throws IllegalArgumentException if initial capacity is negative |
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*/ |
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public ReadMostlyVector(int initialCapacity) { |
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this(initialCapacity, 0); |
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} |
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/** |
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* Creates an empty vector with an underlying array of size {@code 10}. |
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*/ |
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public ReadMostlyVector() { |
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this(10, 0); |
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} |
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/** |
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* Creates a vector containing the elements of the specified |
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* collection, in the order they are returned by the collection's |
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* iterator. |
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* |
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* @param c the collection of initially held elements |
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* @throws NullPointerException if the specified collection is null |
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*/ |
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public ReadMostlyVector(Collection<? extends E> c) { |
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Object[] elements = c.toArray(); |
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// c.toArray might (incorrectly) not return Object[] (see 6260652) |
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if (elements.getClass() != Object[].class) |
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elements = Arrays.copyOf(elements, elements.length, Object[].class); |
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this.array = elements; |
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this.count = elements.length; |
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this.capacityIncrement = 0; |
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this.lock = new SequenceLock(); |
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} |
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// internal constructor for clone |
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ReadMostlyVector(Object[] array, int count, int capacityIncrement) { |
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this.array = array; |
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this.count = count; |
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this.capacityIncrement = capacityIncrement; |
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this.lock = new SequenceLock(); |
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} |
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// For explanation, see CopyOnWriteArrayList |
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final void grow(int minCapacity) { |
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int oldCapacity = array.length; |
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int newCapacity = oldCapacity + ((capacityIncrement > 0) ? |
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capacityIncrement : oldCapacity); |
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if (newCapacity - minCapacity < 0) |
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newCapacity = minCapacity; |
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if (newCapacity - MAX_ARRAY_SIZE > 0) |
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newCapacity = hugeCapacity(minCapacity); |
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array = Arrays.copyOf(array, newCapacity); |
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} |
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140 |
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static int hugeCapacity(int minCapacity) { |
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if (minCapacity < 0) // overflow |
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throw new OutOfMemoryError(); |
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return (minCapacity > MAX_ARRAY_SIZE) ? |
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Integer.MAX_VALUE : |
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MAX_ARRAY_SIZE; |
146 |
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} |
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/* |
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* Internal versions of most base functionality, wrapped |
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* in different ways from public methods from this class |
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* as well as sublist and iterator classes. |
152 |
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*/ |
153 |
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1.2 |
final int validatedIndexOf(Object x, Object[] items, int index, int fence, |
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long seq) { |
156 |
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for (int i = index; i < fence; ++i) { |
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Object e = items[i]; |
158 |
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if (lock.getSequence() != seq) |
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break; |
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if (x == null? e == null : (e != null && x.equals(e))) |
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return i; |
162 |
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} |
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return -1; |
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} |
165 |
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final int rawIndexOf(Object x, int index, int fence) { |
167 |
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Object[] items = array; |
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1.1 |
for (int i = index; i < fence; ++i) { |
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1.2 |
Object e = items[i]; |
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if (x == null? e == null : (e != null && x.equals(e))) |
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1.1 |
return i; |
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} |
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return -1; |
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} |
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1.2 |
final int validatedLastIndexOf(Object x, Object[] items, |
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int index, int origin, long seq) { |
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1.1 |
for (int i = index; i >= origin; --i) { |
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1.2 |
Object e = items[i]; |
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if (lock.getSequence() != seq) |
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break; |
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if (x == null? e == null : (e != null && x.equals(e))) |
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1.1 |
return i; |
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} |
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return -1; |
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} |
187 |
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1.2 |
final int rawLastIndexOf(Object x, int index, int origin) { |
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Object[] items = array; |
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for (int i = index; i >= origin; --i) { |
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Object e = items[i]; |
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if (x == null? e == null : (e != null && x.equals(e))) |
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return i; |
194 |
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} |
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return -1; |
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} |
197 |
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198 |
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final void internalAdd(Object e) { |
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int n = count; |
200 |
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if (n >= array.length) |
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grow(n + 1); |
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array[n] = e; |
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count = n + 1; |
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dl |
1.1 |
} |
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206 |
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1.2 |
final void internalAddAt(int index, Object e) { |
207 |
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int n = count; |
208 |
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if (index > n) |
209 |
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1.1 |
throw new ArrayIndexOutOfBoundsException(index); |
210 |
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1.2 |
if (n >= array.length) |
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grow(n + 1); |
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if (index < n) |
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System.arraycopy(array, index, array, index + 1, n - index); |
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dl |
1.1 |
array[index] = e; |
215 |
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1.2 |
count = n + 1; |
216 |
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1.1 |
} |
217 |
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218 |
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final boolean internalAddAllAt(int index, Object[] elements) { |
219 |
dl |
1.2 |
int n = count; |
220 |
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if (index < 0 || index > n) |
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1.1 |
throw new ArrayIndexOutOfBoundsException(index); |
222 |
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int len = elements.length; |
223 |
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if (len == 0) |
224 |
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return false; |
225 |
dl |
1.2 |
int newCount = n + len; |
226 |
dl |
1.1 |
if (newCount >= array.length) |
227 |
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grow(newCount); |
228 |
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int mv = count - index; |
229 |
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if (mv > 0) |
230 |
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System.arraycopy(array, index, array, index + len, mv); |
231 |
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System.arraycopy(elements, 0, array, index, len); |
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count = newCount; |
233 |
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return true; |
234 |
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} |
235 |
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236 |
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final boolean internalRemoveAt(int index) { |
237 |
dl |
1.2 |
int n = count - 1; |
238 |
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if (index < 0 || index > n) |
239 |
dl |
1.1 |
return false; |
240 |
dl |
1.2 |
int mv = n - index; |
241 |
dl |
1.1 |
if (mv > 0) |
242 |
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System.arraycopy(array, index + 1, array, index, mv); |
243 |
dl |
1.2 |
array[n] = null; |
244 |
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count = n; |
245 |
dl |
1.1 |
return true; |
246 |
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} |
247 |
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248 |
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/** |
249 |
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* Internal version of removeAll for lists and sublists. In this |
250 |
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1.2 |
* and other similar methods below, the bound argument is, if |
251 |
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* non-negative, the purported upper bound of a list/sublist, or |
252 |
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* is left negative if the bound should be determined via count |
253 |
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* field under lock. |
254 |
dl |
1.1 |
*/ |
255 |
dl |
1.2 |
final boolean internalRemoveAll(Collection<?> c, int origin, int bound) { |
256 |
dl |
1.1 |
SequenceLock lock = this.lock; |
257 |
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boolean removed = false; |
258 |
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lock.lock(); |
259 |
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try { |
260 |
dl |
1.2 |
int n = count; |
261 |
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int fence = bound < 0 || bound > n ? n : bound; |
262 |
dl |
1.1 |
if (origin >= 0 && origin < fence) { |
263 |
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for (Object x : c) { |
264 |
dl |
1.2 |
while (internalRemoveAt(rawIndexOf(x, origin, fence))) |
265 |
dl |
1.1 |
removed = true; |
266 |
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} |
267 |
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} |
268 |
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} finally { |
269 |
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lock.unlock(); |
270 |
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} |
271 |
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return removed; |
272 |
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} |
273 |
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274 |
dl |
1.2 |
final boolean internalRetainAll(Collection<?> c, int origin, int bound) { |
275 |
dl |
1.1 |
SequenceLock lock = this.lock; |
276 |
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boolean removed = false; |
277 |
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if (c != this) { |
278 |
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lock.lock(); |
279 |
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try { |
280 |
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int i = origin; |
281 |
dl |
1.2 |
int n = count; |
282 |
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int fence = bound < 0 || bound > n ? n : bound; |
283 |
dl |
1.1 |
while (i < fence) { |
284 |
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if (c.contains(array[i])) |
285 |
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++i; |
286 |
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else { |
287 |
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--fence; |
288 |
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int mv = --count - i; |
289 |
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if (mv > 0) |
290 |
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System.arraycopy(array, i + 1, array, i, mv); |
291 |
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removed = true; |
292 |
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} |
293 |
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} |
294 |
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} finally { |
295 |
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lock.unlock(); |
296 |
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} |
297 |
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} |
298 |
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return removed; |
299 |
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} |
300 |
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301 |
dl |
1.2 |
final void internalClear(int origin, int bound) { |
302 |
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int n = count; |
303 |
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int fence = bound < 0 || bound > n ? n : bound; |
304 |
dl |
1.1 |
if (origin >= 0 && origin < fence) { |
305 |
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int removed = fence - origin; |
306 |
dl |
1.2 |
int newCount = n - removed; |
307 |
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int mv = n - (origin + removed); |
308 |
dl |
1.1 |
if (mv > 0) |
309 |
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System.arraycopy(array, origin + removed, array, origin, mv); |
310 |
dl |
1.2 |
for (int i = n; i < newCount; ++i) |
311 |
dl |
1.1 |
array[i] = null; |
312 |
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count = newCount; |
313 |
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} |
314 |
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} |
315 |
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|
316 |
dl |
1.2 |
final boolean internalContainsAll(Collection<?> c, int origin, int bound) { |
317 |
dl |
1.1 |
SequenceLock lock = this.lock; |
318 |
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boolean contained; |
319 |
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boolean locked = false; |
320 |
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try { |
321 |
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for (;;) { |
322 |
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long seq = lock.awaitAvailability(); |
323 |
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Object[] items = array; |
324 |
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int len = items.length; |
325 |
dl |
1.2 |
int n = count; |
326 |
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if (n > len) |
327 |
dl |
1.1 |
continue; |
328 |
dl |
1.2 |
int fence = bound < 0 || bound > n ? n : bound; |
329 |
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if (origin < 0) |
330 |
dl |
1.1 |
contained = false; |
331 |
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else { |
332 |
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contained = true; |
333 |
dl |
1.2 |
for (Object e : c) { |
334 |
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if (validatedIndexOf(e, items, origin, fence, seq) < 0) { |
335 |
dl |
1.1 |
contained = false; |
336 |
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break; |
337 |
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} |
338 |
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} |
339 |
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} |
340 |
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if (lock.getSequence() == seq) |
341 |
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break; |
342 |
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lock.lock(); |
343 |
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locked = true; |
344 |
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} |
345 |
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} finally { |
346 |
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if (locked) |
347 |
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lock.unlock(); |
348 |
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} |
349 |
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return contained; |
350 |
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} |
351 |
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|
352 |
dl |
1.2 |
final boolean internalEquals(List<?> list, int origin, int bound) { |
353 |
dl |
1.1 |
SequenceLock lock = this.lock; |
354 |
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boolean equal; |
355 |
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boolean locked = false; |
356 |
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try { |
357 |
dl |
1.2 |
outer:for (;;) { |
358 |
dl |
1.1 |
equal = true; |
359 |
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long seq = lock.awaitAvailability(); |
360 |
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Object[] items = array; |
361 |
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int len = items.length; |
362 |
dl |
1.2 |
int n = count; |
363 |
|
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if (n > len) |
364 |
dl |
1.1 |
continue; |
365 |
dl |
1.2 |
int fence = bound < 0 || bound > n ? n : bound; |
366 |
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if (origin < 0) |
367 |
dl |
1.1 |
equal = false; |
368 |
|
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else { |
369 |
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Iterator<?> it = list.iterator(); |
370 |
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for (int i = origin; i < fence; ++i) { |
371 |
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if (!it.hasNext()) { |
372 |
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equal = false; |
373 |
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break; |
374 |
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} |
375 |
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Object x = it.next(); |
376 |
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Object y = items[i]; |
377 |
dl |
1.2 |
if (lock.getSequence() != seq) |
378 |
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continue outer; |
379 |
dl |
1.1 |
if (x == null? y != null : (y == null || !x.equals(y))) { |
380 |
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equal = false; |
381 |
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break; |
382 |
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} |
383 |
|
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} |
384 |
|
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if (equal && it.hasNext()) |
385 |
|
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equal = false; |
386 |
|
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} |
387 |
|
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if (lock.getSequence() == seq) |
388 |
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break; |
389 |
|
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lock.lock(); |
390 |
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locked = true; |
391 |
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} |
392 |
|
|
} finally { |
393 |
|
|
if (locked) |
394 |
|
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lock.unlock(); |
395 |
|
|
} |
396 |
|
|
return equal; |
397 |
|
|
} |
398 |
|
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|
399 |
dl |
1.2 |
final int internalHashCode(int origin, int bound) { |
400 |
dl |
1.1 |
SequenceLock lock = this.lock; |
401 |
|
|
int hash; |
402 |
|
|
boolean locked = false; |
403 |
|
|
try { |
404 |
|
|
for (;;) { |
405 |
|
|
hash = 1; |
406 |
|
|
long seq = lock.awaitAvailability(); |
407 |
|
|
Object[] items = array; |
408 |
|
|
int len = items.length; |
409 |
dl |
1.2 |
int n = count; |
410 |
|
|
if (n > len) |
411 |
dl |
1.1 |
continue; |
412 |
dl |
1.2 |
int fence = bound < 0 || bound > n ? n : bound; |
413 |
|
|
if (origin >= 0) { |
414 |
dl |
1.1 |
for (int i = origin; i < fence; ++i) { |
415 |
|
|
Object e = items[i]; |
416 |
|
|
hash = 31*hash + (e == null ? 0 : e.hashCode()); |
417 |
|
|
} |
418 |
|
|
} |
419 |
|
|
if (lock.getSequence() == seq) |
420 |
|
|
break; |
421 |
|
|
lock.lock(); |
422 |
|
|
locked = true; |
423 |
|
|
} |
424 |
|
|
} finally { |
425 |
|
|
if (locked) |
426 |
|
|
lock.unlock(); |
427 |
|
|
} |
428 |
|
|
return hash; |
429 |
|
|
} |
430 |
|
|
|
431 |
dl |
1.2 |
final String internalToString(int origin, int bound) { |
432 |
dl |
1.1 |
SequenceLock lock = this.lock; |
433 |
|
|
String ret; |
434 |
|
|
boolean locked = false; |
435 |
|
|
try { |
436 |
dl |
1.2 |
outer:for (;;) { |
437 |
dl |
1.1 |
long seq = lock.awaitAvailability(); |
438 |
|
|
Object[] items = array; |
439 |
|
|
int len = items.length; |
440 |
dl |
1.2 |
int n = count; |
441 |
|
|
if (n > len) |
442 |
dl |
1.1 |
continue; |
443 |
dl |
1.2 |
int fence = bound < 0 || bound > n ? n : bound; |
444 |
|
|
if (origin < 0 || origin == fence) |
445 |
|
|
ret = "[]"; |
446 |
|
|
else { |
447 |
|
|
StringBuilder sb = new StringBuilder(); |
448 |
|
|
sb.append('['); |
449 |
|
|
for (int i = origin;;) { |
450 |
|
|
Object e = items[i]; |
451 |
|
|
if (e == this) |
452 |
|
|
sb.append("(this Collection)"); |
453 |
|
|
else if (lock.getSequence() != seq) |
454 |
|
|
continue outer; |
455 |
|
|
else |
456 |
|
|
sb.append(e.toString()); |
457 |
|
|
if (++i < fence) |
458 |
|
|
sb.append(',').append(' '); |
459 |
|
|
else { |
460 |
|
|
ret = sb.append(']').toString(); |
461 |
|
|
break; |
462 |
dl |
1.1 |
} |
463 |
|
|
} |
464 |
|
|
} |
465 |
dl |
1.2 |
if (lock.getSequence() == seq) |
466 |
|
|
break; |
467 |
dl |
1.1 |
lock.lock(); |
468 |
|
|
locked = true; |
469 |
|
|
} |
470 |
|
|
} finally { |
471 |
|
|
if (locked) |
472 |
|
|
lock.unlock(); |
473 |
|
|
} |
474 |
|
|
return ret; |
475 |
|
|
} |
476 |
|
|
|
477 |
dl |
1.2 |
final Object[] internalToArray(int origin, int bound) { |
478 |
dl |
1.1 |
Object[] result; |
479 |
|
|
SequenceLock lock = this.lock; |
480 |
|
|
boolean locked = false; |
481 |
|
|
try { |
482 |
|
|
for (;;) { |
483 |
|
|
result = null; |
484 |
|
|
long seq = lock.awaitAvailability(); |
485 |
|
|
Object[] items = array; |
486 |
|
|
int len = items.length; |
487 |
dl |
1.2 |
int n = count; |
488 |
|
|
if (n > len) |
489 |
|
|
continue; |
490 |
|
|
int fence = bound < 0 || bound > n ? n : bound; |
491 |
|
|
if (origin >= 0) |
492 |
dl |
1.1 |
result = Arrays.copyOfRange(items, origin, fence, |
493 |
|
|
Object[].class); |
494 |
dl |
1.2 |
if (lock.getSequence() == seq) |
495 |
|
|
break; |
496 |
dl |
1.1 |
lock.lock(); |
497 |
|
|
locked = true; |
498 |
|
|
} |
499 |
|
|
} finally { |
500 |
|
|
if (locked) |
501 |
|
|
lock.unlock(); |
502 |
|
|
} |
503 |
|
|
return result; |
504 |
|
|
} |
505 |
|
|
|
506 |
dl |
1.2 |
final <T> T[] internalToArray(T[] a, int origin, int bound) { |
507 |
|
|
int alen = a.length; |
508 |
dl |
1.1 |
T[] result; |
509 |
|
|
SequenceLock lock = this.lock; |
510 |
|
|
boolean locked = false; |
511 |
|
|
try { |
512 |
|
|
for (;;) { |
513 |
|
|
long seq = lock.awaitAvailability(); |
514 |
|
|
Object[] items = array; |
515 |
|
|
int len = items.length; |
516 |
dl |
1.2 |
int n = count; |
517 |
|
|
if (n > len) |
518 |
|
|
continue; |
519 |
|
|
int fence = bound < 0 || bound > n ? n : bound; |
520 |
|
|
int rlen = fence - origin; |
521 |
|
|
if (origin < 0 || alen >= rlen) { |
522 |
|
|
if (rlen < 0) |
523 |
|
|
rlen = 0; |
524 |
|
|
else if (rlen > 0) |
525 |
|
|
System.arraycopy(array, 0, a, origin, rlen); |
526 |
|
|
if (alen > rlen) |
527 |
|
|
a[rlen] = null; |
528 |
|
|
result = a; |
529 |
dl |
1.1 |
} |
530 |
dl |
1.2 |
else |
531 |
|
|
result = (T[]) Arrays.copyOfRange(array, origin, |
532 |
|
|
fence, a.getClass()); |
533 |
|
|
if (lock.getSequence() == seq) |
534 |
|
|
break; |
535 |
dl |
1.1 |
lock.lock(); |
536 |
|
|
locked = true; |
537 |
|
|
} |
538 |
|
|
} finally { |
539 |
|
|
if (locked) |
540 |
|
|
lock.unlock(); |
541 |
|
|
} |
542 |
|
|
return result; |
543 |
|
|
} |
544 |
|
|
|
545 |
|
|
// public List methods |
546 |
|
|
|
547 |
|
|
public boolean add(E e) { |
548 |
|
|
SequenceLock lock = this.lock; |
549 |
|
|
lock.lock(); |
550 |
|
|
try { |
551 |
|
|
internalAdd(e); |
552 |
|
|
} finally { |
553 |
|
|
lock.unlock(); |
554 |
|
|
} |
555 |
|
|
return true; |
556 |
|
|
} |
557 |
|
|
|
558 |
|
|
public void add(int index, E element) { |
559 |
|
|
SequenceLock lock = this.lock; |
560 |
|
|
lock.lock(); |
561 |
|
|
try { |
562 |
|
|
internalAddAt(index, element); |
563 |
|
|
} finally { |
564 |
|
|
lock.unlock(); |
565 |
|
|
} |
566 |
|
|
} |
567 |
|
|
|
568 |
|
|
public boolean addAll(Collection<? extends E> c) { |
569 |
|
|
Object[] elements = c.toArray(); |
570 |
|
|
int len = elements.length; |
571 |
|
|
if (len == 0) |
572 |
|
|
return false; |
573 |
|
|
SequenceLock lock = this.lock; |
574 |
|
|
lock.lock(); |
575 |
|
|
try { |
576 |
|
|
int newCount = count + len; |
577 |
|
|
if (newCount >= array.length) |
578 |
|
|
grow(newCount); |
579 |
|
|
System.arraycopy(elements, 0, array, count, len); |
580 |
|
|
count = newCount; |
581 |
|
|
} finally { |
582 |
|
|
lock.unlock(); |
583 |
|
|
} |
584 |
|
|
return true; |
585 |
|
|
} |
586 |
|
|
|
587 |
|
|
public boolean addAll(int index, Collection<? extends E> c) { |
588 |
|
|
SequenceLock lock = this.lock; |
589 |
|
|
boolean ret; |
590 |
|
|
Object[] elements = c.toArray(); |
591 |
|
|
lock.lock(); |
592 |
|
|
try { |
593 |
|
|
ret = internalAddAllAt(index, elements); |
594 |
|
|
} finally { |
595 |
|
|
lock.unlock(); |
596 |
|
|
} |
597 |
|
|
return ret; |
598 |
|
|
} |
599 |
|
|
|
600 |
|
|
public void clear() { |
601 |
|
|
SequenceLock lock = this.lock; |
602 |
|
|
lock.lock(); |
603 |
|
|
try { |
604 |
|
|
for (int i = 0; i < count; i++) |
605 |
|
|
array[i] = null; |
606 |
|
|
count = 0; |
607 |
|
|
} finally { |
608 |
|
|
lock.unlock(); |
609 |
|
|
} |
610 |
|
|
} |
611 |
|
|
|
612 |
|
|
public boolean contains(Object o) { |
613 |
|
|
return indexOf(o, 0) >= 0; |
614 |
|
|
} |
615 |
|
|
|
616 |
|
|
public boolean containsAll(Collection<?> c) { |
617 |
|
|
return internalContainsAll(c, 0, -1); |
618 |
|
|
} |
619 |
|
|
|
620 |
|
|
public boolean equals(Object o) { |
621 |
|
|
if (o == this) |
622 |
|
|
return true; |
623 |
|
|
if (!(o instanceof List)) |
624 |
|
|
return false; |
625 |
|
|
return internalEquals((List<?>)(o), 0, -1); |
626 |
|
|
} |
627 |
|
|
|
628 |
|
|
public E get(int index) { |
629 |
|
|
SequenceLock lock = this.lock; |
630 |
|
|
for (;;) { |
631 |
|
|
long seq = lock.awaitAvailability(); |
632 |
|
|
Object[] items = array; |
633 |
dl |
1.2 |
int n = count; |
634 |
|
|
if (n > items.length) |
635 |
dl |
1.1 |
continue; |
636 |
dl |
1.2 |
Object e; boolean ex; |
637 |
|
|
if (index < 0 || index >= n) { |
638 |
dl |
1.1 |
e = null; |
639 |
|
|
ex = true; |
640 |
|
|
} |
641 |
|
|
else { |
642 |
dl |
1.2 |
e = items[index]; |
643 |
dl |
1.1 |
ex = false; |
644 |
|
|
} |
645 |
|
|
if (lock.getSequence() == seq) { |
646 |
|
|
if (ex) |
647 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
648 |
|
|
else |
649 |
dl |
1.2 |
return (E)e; |
650 |
dl |
1.1 |
} |
651 |
|
|
} |
652 |
|
|
} |
653 |
|
|
|
654 |
|
|
public int hashCode() { |
655 |
|
|
return internalHashCode(0, -1); |
656 |
|
|
} |
657 |
|
|
|
658 |
|
|
public int indexOf(Object o) { |
659 |
|
|
SequenceLock lock = this.lock; |
660 |
|
|
long seq = lock.awaitAvailability(); |
661 |
|
|
Object[] items = array; |
662 |
dl |
1.2 |
int n = count; |
663 |
|
|
if (n <= items.length) { |
664 |
|
|
int idx = validatedIndexOf(o, items, 0, n, seq); |
665 |
dl |
1.1 |
if (lock.getSequence() == seq) |
666 |
|
|
return idx; |
667 |
|
|
} |
668 |
|
|
lock.lock(); |
669 |
|
|
try { |
670 |
dl |
1.2 |
return rawIndexOf(o, 0, count); |
671 |
dl |
1.1 |
} finally { |
672 |
|
|
lock.unlock(); |
673 |
|
|
} |
674 |
|
|
} |
675 |
|
|
|
676 |
|
|
public boolean isEmpty() { |
677 |
|
|
long ignore = lock.getSequence(); |
678 |
|
|
return count == 0; |
679 |
|
|
} |
680 |
|
|
|
681 |
|
|
public Iterator<E> iterator() { |
682 |
|
|
return new Itr(this, 0); |
683 |
|
|
} |
684 |
|
|
|
685 |
|
|
public int lastIndexOf(Object o) { |
686 |
|
|
SequenceLock lock = this.lock; |
687 |
|
|
long seq = lock.awaitAvailability(); |
688 |
|
|
Object[] items = array; |
689 |
dl |
1.2 |
int n = count; |
690 |
|
|
if (n <= items.length) { |
691 |
|
|
int idx = validatedLastIndexOf(o, items, n - 1, 0, seq); |
692 |
dl |
1.1 |
if (lock.getSequence() == seq) |
693 |
|
|
return idx; |
694 |
|
|
} |
695 |
|
|
lock.lock(); |
696 |
|
|
try { |
697 |
dl |
1.2 |
return rawLastIndexOf(o, count - 1, 0); |
698 |
dl |
1.1 |
} finally { |
699 |
|
|
lock.unlock(); |
700 |
|
|
} |
701 |
|
|
} |
702 |
|
|
|
703 |
|
|
public ListIterator<E> listIterator() { |
704 |
|
|
return new Itr(this, 0); |
705 |
|
|
} |
706 |
|
|
|
707 |
|
|
public ListIterator<E> listIterator(int index) { |
708 |
|
|
return new Itr(this, index); |
709 |
|
|
} |
710 |
|
|
|
711 |
|
|
public E remove(int index) { |
712 |
|
|
SequenceLock lock = this.lock; |
713 |
dl |
1.2 |
Object oldValue; |
714 |
dl |
1.1 |
lock.lock(); |
715 |
|
|
try { |
716 |
|
|
if (index < 0 || index >= count) |
717 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
718 |
dl |
1.2 |
oldValue = array[index]; |
719 |
dl |
1.1 |
internalRemoveAt(index); |
720 |
|
|
} finally { |
721 |
|
|
lock.unlock(); |
722 |
|
|
} |
723 |
dl |
1.2 |
return (E)oldValue; |
724 |
dl |
1.1 |
} |
725 |
|
|
|
726 |
|
|
public boolean remove(Object o) { |
727 |
|
|
SequenceLock lock = this.lock; |
728 |
|
|
boolean removed; |
729 |
|
|
lock.lock(); |
730 |
|
|
try { |
731 |
dl |
1.2 |
removed = internalRemoveAt(rawIndexOf(o, 0, count)); |
732 |
dl |
1.1 |
} finally { |
733 |
|
|
lock.unlock(); |
734 |
|
|
} |
735 |
|
|
return removed; |
736 |
|
|
} |
737 |
|
|
|
738 |
|
|
public boolean removeAll(Collection<?> c) { |
739 |
|
|
return internalRemoveAll(c, 0, -1); |
740 |
|
|
} |
741 |
|
|
|
742 |
|
|
public boolean retainAll(Collection<?> c) { |
743 |
|
|
return internalRetainAll(c, 0, -1); |
744 |
|
|
} |
745 |
|
|
|
746 |
|
|
public E set(int index, E element) { |
747 |
dl |
1.2 |
Object oldValue; |
748 |
dl |
1.1 |
SequenceLock lock = this.lock; |
749 |
|
|
lock.lock(); |
750 |
|
|
try { |
751 |
|
|
if (index < 0 || index >= count) |
752 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
753 |
dl |
1.2 |
oldValue = array[index]; |
754 |
dl |
1.1 |
array[index] = element; |
755 |
|
|
} finally { |
756 |
|
|
lock.unlock(); |
757 |
|
|
} |
758 |
dl |
1.2 |
return (E)oldValue; |
759 |
dl |
1.1 |
} |
760 |
|
|
|
761 |
|
|
public int size() { |
762 |
|
|
long ignore = lock.getSequence(); |
763 |
|
|
return count; |
764 |
|
|
} |
765 |
|
|
|
766 |
|
|
public List<E> subList(int fromIndex, int toIndex) { |
767 |
|
|
int c = size(); |
768 |
|
|
int ssize = toIndex - fromIndex; |
769 |
|
|
if (fromIndex < 0 || toIndex > c || ssize < 0) |
770 |
|
|
throw new IndexOutOfBoundsException(); |
771 |
|
|
return new ReadMostlyVectorSublist(this, fromIndex, ssize); |
772 |
|
|
} |
773 |
|
|
|
774 |
|
|
public Object[] toArray() { |
775 |
|
|
return internalToArray(0, -1); |
776 |
|
|
} |
777 |
|
|
|
778 |
|
|
public <T> T[] toArray(T[] a) { |
779 |
|
|
return internalToArray(a, 0, -1); |
780 |
|
|
} |
781 |
|
|
|
782 |
|
|
public String toString() { |
783 |
|
|
return internalToString(0, -1); |
784 |
|
|
} |
785 |
|
|
|
786 |
|
|
// ReadMostlyVector-only methods |
787 |
|
|
|
788 |
|
|
/** |
789 |
|
|
* Append the element if not present. |
790 |
|
|
* |
791 |
|
|
* @param e element to be added to this list, if absent |
792 |
|
|
* @return <tt>true</tt> if the element was added |
793 |
|
|
*/ |
794 |
|
|
public boolean addIfAbsent(E e) { |
795 |
|
|
boolean added; |
796 |
|
|
SequenceLock lock = this.lock; |
797 |
|
|
lock.lock(); |
798 |
|
|
try { |
799 |
dl |
1.2 |
if (rawIndexOf(e, 0, count) < 0) { |
800 |
dl |
1.1 |
internalAdd(e); |
801 |
|
|
added = true; |
802 |
|
|
} |
803 |
|
|
else |
804 |
|
|
added = false; |
805 |
|
|
} finally { |
806 |
|
|
lock.unlock(); |
807 |
|
|
} |
808 |
|
|
return added; |
809 |
|
|
} |
810 |
|
|
|
811 |
|
|
/** |
812 |
|
|
* Appends all of the elements in the specified collection that |
813 |
|
|
* are not already contained in this list, to the end of |
814 |
|
|
* this list, in the order that they are returned by the |
815 |
|
|
* specified collection's iterator. |
816 |
|
|
* |
817 |
|
|
* @param c collection containing elements to be added to this list |
818 |
|
|
* @return the number of elements added |
819 |
|
|
* @throws NullPointerException if the specified collection is null |
820 |
|
|
* @see #addIfAbsent(Object) |
821 |
|
|
*/ |
822 |
|
|
public int addAllAbsent(Collection<? extends E> c) { |
823 |
|
|
int added = 0; |
824 |
|
|
Object[] cs = c.toArray(); |
825 |
|
|
int clen = cs.length; |
826 |
|
|
if (clen != 0) { |
827 |
|
|
lock.lock(); |
828 |
|
|
try { |
829 |
|
|
for (int i = 0; i < clen; ++i) { |
830 |
|
|
Object e = cs[i]; |
831 |
dl |
1.2 |
if (rawIndexOf(e, 0, count) < 0) { |
832 |
|
|
internalAdd(e); |
833 |
dl |
1.1 |
++added; |
834 |
|
|
} |
835 |
|
|
} |
836 |
|
|
} finally { |
837 |
|
|
lock.unlock(); |
838 |
|
|
} |
839 |
|
|
} |
840 |
|
|
return added; |
841 |
|
|
} |
842 |
|
|
|
843 |
|
|
// Vector-only methods |
844 |
|
|
|
845 |
|
|
/** See {@link Vector#firstElement} */ |
846 |
|
|
public E firstElement() { |
847 |
|
|
SequenceLock lock = this.lock; |
848 |
|
|
for (;;) { |
849 |
|
|
long seq = lock.awaitAvailability(); |
850 |
|
|
Object[] items = array; |
851 |
|
|
int len = items.length; |
852 |
dl |
1.2 |
int n = count; |
853 |
|
|
if (n > len) |
854 |
dl |
1.1 |
continue; |
855 |
dl |
1.2 |
Object e; boolean ex; |
856 |
|
|
if (n > 0) { |
857 |
|
|
e = items[0]; |
858 |
|
|
ex = false; |
859 |
|
|
} |
860 |
|
|
else { |
861 |
dl |
1.1 |
e = null; |
862 |
|
|
ex = true; |
863 |
|
|
} |
864 |
|
|
if (lock.getSequence() == seq) { |
865 |
|
|
if (ex) |
866 |
|
|
throw new NoSuchElementException(); |
867 |
|
|
else |
868 |
dl |
1.2 |
return (E)e; |
869 |
dl |
1.1 |
} |
870 |
|
|
} |
871 |
|
|
} |
872 |
|
|
|
873 |
|
|
/** See {@link Vector#lastElement} */ |
874 |
|
|
public E lastElement() { |
875 |
|
|
SequenceLock lock = this.lock; |
876 |
|
|
for (;;) { |
877 |
|
|
long seq = lock.awaitAvailability(); |
878 |
|
|
Object[] items = array; |
879 |
|
|
int len = items.length; |
880 |
dl |
1.2 |
int n = count; |
881 |
|
|
if (n > len) |
882 |
dl |
1.1 |
continue; |
883 |
dl |
1.2 |
Object e; boolean ex; |
884 |
|
|
if (n > 0) { |
885 |
|
|
e = items[n - 1]; |
886 |
|
|
ex = false; |
887 |
|
|
} |
888 |
|
|
else { |
889 |
dl |
1.1 |
e = null; |
890 |
|
|
ex = true; |
891 |
|
|
} |
892 |
|
|
if (lock.getSequence() == seq) { |
893 |
|
|
if (ex) |
894 |
|
|
throw new NoSuchElementException(); |
895 |
|
|
else |
896 |
dl |
1.2 |
return (E)e; |
897 |
dl |
1.1 |
} |
898 |
|
|
} |
899 |
|
|
} |
900 |
|
|
|
901 |
|
|
/** See {@link Vector#indexOf(Object, int)} */ |
902 |
|
|
public int indexOf(Object o, int index) { |
903 |
|
|
SequenceLock lock = this.lock; |
904 |
|
|
int idx = 0; |
905 |
|
|
boolean ex = false; |
906 |
|
|
long seq = lock.awaitAvailability(); |
907 |
|
|
Object[] items = array; |
908 |
dl |
1.2 |
int n = count; |
909 |
dl |
1.1 |
boolean retry = false; |
910 |
dl |
1.2 |
if (n > items.length) |
911 |
dl |
1.1 |
retry = true; |
912 |
|
|
else if (index < 0) |
913 |
|
|
ex = true; |
914 |
|
|
else |
915 |
dl |
1.2 |
idx = validatedIndexOf(o, items, index, n, seq); |
916 |
dl |
1.1 |
if (retry || lock.getSequence() != seq) { |
917 |
|
|
lock.lock(); |
918 |
|
|
try { |
919 |
|
|
if (index < 0) |
920 |
|
|
ex = true; |
921 |
|
|
else |
922 |
dl |
1.2 |
idx = rawIndexOf(o, 0, count); |
923 |
dl |
1.1 |
} finally { |
924 |
|
|
lock.unlock(); |
925 |
|
|
} |
926 |
|
|
} |
927 |
|
|
if (ex) |
928 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
929 |
|
|
return idx; |
930 |
|
|
} |
931 |
|
|
|
932 |
|
|
/** See {@link Vector#lastIndexOf(Object, int)} */ |
933 |
|
|
public int lastIndexOf(Object o, int index) { |
934 |
|
|
SequenceLock lock = this.lock; |
935 |
|
|
int idx = 0; |
936 |
|
|
boolean ex = false; |
937 |
|
|
long seq = lock.awaitAvailability(); |
938 |
|
|
Object[] items = array; |
939 |
dl |
1.2 |
int n = count; |
940 |
dl |
1.1 |
boolean retry = false; |
941 |
dl |
1.2 |
if (n > items.length) |
942 |
dl |
1.1 |
retry = true; |
943 |
dl |
1.2 |
else if (index >= n) |
944 |
dl |
1.1 |
ex = true; |
945 |
|
|
else |
946 |
dl |
1.2 |
idx = validatedLastIndexOf(o, items, index, 0, seq); |
947 |
dl |
1.1 |
if (retry || lock.getSequence() != seq) { |
948 |
|
|
lock.lock(); |
949 |
|
|
try { |
950 |
|
|
if (index >= count) |
951 |
|
|
ex = true; |
952 |
|
|
else |
953 |
dl |
1.2 |
idx = rawLastIndexOf(o, index, 0); |
954 |
dl |
1.1 |
} finally { |
955 |
|
|
lock.unlock(); |
956 |
|
|
} |
957 |
|
|
} |
958 |
|
|
if (ex) |
959 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
960 |
|
|
return idx; |
961 |
|
|
} |
962 |
|
|
|
963 |
|
|
/** See {@link Vector#setSize} */ |
964 |
|
|
public void setSize(int newSize) { |
965 |
|
|
if (newSize < 0) |
966 |
|
|
throw new ArrayIndexOutOfBoundsException(newSize); |
967 |
|
|
SequenceLock lock = this.lock; |
968 |
|
|
lock.lock(); |
969 |
|
|
try { |
970 |
dl |
1.2 |
int n = count; |
971 |
|
|
if (newSize > n) |
972 |
dl |
1.1 |
grow(newSize); |
973 |
|
|
else { |
974 |
dl |
1.2 |
for (int i = newSize ; i < n ; i++) |
975 |
dl |
1.1 |
array[i] = null; |
976 |
|
|
} |
977 |
|
|
count = newSize; |
978 |
|
|
} finally { |
979 |
|
|
lock.unlock(); |
980 |
|
|
} |
981 |
|
|
} |
982 |
|
|
|
983 |
|
|
/** See {@link Vector#copyInto} */ |
984 |
|
|
public void copyInto(Object[] anArray) { |
985 |
|
|
SequenceLock lock = this.lock; |
986 |
|
|
lock.lock(); |
987 |
|
|
try { |
988 |
|
|
System.arraycopy(array, 0, anArray, 0, count); |
989 |
|
|
} finally { |
990 |
|
|
lock.unlock(); |
991 |
|
|
} |
992 |
|
|
} |
993 |
|
|
|
994 |
|
|
/** See {@link Vector#trimToSize} */ |
995 |
|
|
public void trimToSize() { |
996 |
|
|
SequenceLock lock = this.lock; |
997 |
|
|
lock.lock(); |
998 |
|
|
try { |
999 |
|
|
if (count < array.length) |
1000 |
|
|
array = Arrays.copyOf(array, count); |
1001 |
|
|
} finally { |
1002 |
|
|
lock.unlock(); |
1003 |
|
|
} |
1004 |
|
|
} |
1005 |
|
|
|
1006 |
|
|
/** See {@link Vector#ensureCapacity} */ |
1007 |
|
|
public void ensureCapacity(int minCapacity) { |
1008 |
|
|
if (minCapacity > 0) { |
1009 |
|
|
SequenceLock lock = this.lock; |
1010 |
|
|
lock.lock(); |
1011 |
|
|
try { |
1012 |
|
|
if (minCapacity - array.length > 0) |
1013 |
|
|
grow(minCapacity); |
1014 |
|
|
} finally { |
1015 |
|
|
lock.unlock(); |
1016 |
|
|
} |
1017 |
|
|
} |
1018 |
|
|
} |
1019 |
|
|
|
1020 |
|
|
/** See {@link Vector#elements} */ |
1021 |
|
|
public Enumeration<E> elements() { |
1022 |
|
|
return new Itr(this, 0); |
1023 |
|
|
} |
1024 |
|
|
|
1025 |
|
|
/** See {@link Vector#capacity} */ |
1026 |
|
|
public int capacity() { |
1027 |
|
|
long ignore = lock.getSequence(); |
1028 |
|
|
return array.length; |
1029 |
|
|
} |
1030 |
|
|
|
1031 |
|
|
/** See {@link Vector#elementAt} */ |
1032 |
|
|
public E elementAt(int index) { |
1033 |
|
|
return get(index); |
1034 |
|
|
} |
1035 |
|
|
|
1036 |
|
|
/** See {@link Vector#setElementAt} */ |
1037 |
|
|
public void setElementAt(E obj, int index) { |
1038 |
|
|
set(index, obj); |
1039 |
|
|
} |
1040 |
|
|
|
1041 |
|
|
/** See {@link Vector#removeElementAt} */ |
1042 |
|
|
public void removeElementAt(int index) { |
1043 |
|
|
remove(index); |
1044 |
|
|
} |
1045 |
|
|
|
1046 |
|
|
/** See {@link Vector#insertElementAt} */ |
1047 |
|
|
public void insertElementAt(E obj, int index) { |
1048 |
|
|
add(index, obj); |
1049 |
|
|
} |
1050 |
|
|
|
1051 |
|
|
/** See {@link Vector#addElement} */ |
1052 |
|
|
public void addElement(E obj) { |
1053 |
|
|
add(obj); |
1054 |
|
|
} |
1055 |
|
|
|
1056 |
|
|
/** See {@link Vector#removeElement} */ |
1057 |
|
|
public boolean removeElement(Object obj) { |
1058 |
|
|
return remove(obj); |
1059 |
|
|
} |
1060 |
|
|
|
1061 |
|
|
/** See {@link Vector#removeAllElements} */ |
1062 |
|
|
public void removeAllElements() { |
1063 |
|
|
clear(); |
1064 |
|
|
} |
1065 |
|
|
|
1066 |
|
|
// other methods |
1067 |
|
|
|
1068 |
|
|
public Object clone() { |
1069 |
|
|
SequenceLock lock = this.lock; |
1070 |
|
|
Object[] a = null; |
1071 |
|
|
boolean retry = false; |
1072 |
|
|
long seq = lock.awaitAvailability(); |
1073 |
|
|
Object[] items = array; |
1074 |
dl |
1.2 |
int n = count; |
1075 |
|
|
if (n <= items.length) |
1076 |
|
|
a = Arrays.copyOf(items, n); |
1077 |
dl |
1.1 |
else |
1078 |
|
|
retry = true; |
1079 |
|
|
if (retry || lock.getSequence() != seq) { |
1080 |
|
|
lock.lock(); |
1081 |
|
|
try { |
1082 |
dl |
1.2 |
n = count; |
1083 |
|
|
a = Arrays.copyOf(array, n); |
1084 |
dl |
1.1 |
} finally { |
1085 |
|
|
lock.unlock(); |
1086 |
|
|
} |
1087 |
|
|
} |
1088 |
dl |
1.2 |
return new ReadMostlyVector(a, n, capacityIncrement); |
1089 |
dl |
1.1 |
} |
1090 |
|
|
|
1091 |
|
|
private void writeObject(java.io.ObjectOutputStream s) |
1092 |
|
|
throws java.io.IOException { |
1093 |
|
|
SequenceLock lock = this.lock; |
1094 |
|
|
lock.lock(); |
1095 |
|
|
try { |
1096 |
|
|
s.defaultWriteObject(); |
1097 |
|
|
} finally { |
1098 |
|
|
lock.unlock(); |
1099 |
|
|
} |
1100 |
|
|
} |
1101 |
|
|
|
1102 |
|
|
static final class Itr<E> implements ListIterator<E>, Enumeration<E> { |
1103 |
|
|
final ReadMostlyVector<E> list; |
1104 |
|
|
final SequenceLock lock; |
1105 |
|
|
Object[] items; |
1106 |
|
|
Object next, prev; |
1107 |
|
|
long seq; |
1108 |
|
|
int cursor; |
1109 |
|
|
int fence; |
1110 |
|
|
int lastRet; |
1111 |
dl |
1.2 |
boolean validNext, validPrev; |
1112 |
dl |
1.1 |
|
1113 |
|
|
Itr(ReadMostlyVector<E> list, int index) { |
1114 |
|
|
this.list = list; |
1115 |
|
|
this.lock = list.lock; |
1116 |
|
|
this.cursor = index; |
1117 |
|
|
this.lastRet = -1; |
1118 |
|
|
refresh(); |
1119 |
|
|
if (index < 0 || index > fence) |
1120 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
1121 |
|
|
} |
1122 |
|
|
|
1123 |
|
|
private void refresh() { |
1124 |
dl |
1.2 |
validNext = validPrev = false; |
1125 |
dl |
1.1 |
do { |
1126 |
|
|
seq = lock.awaitAvailability(); |
1127 |
|
|
items = list.array; |
1128 |
dl |
1.2 |
} while ((fence = list.count) > items.length || |
1129 |
|
|
lock.getSequence() != seq); |
1130 |
dl |
1.1 |
} |
1131 |
|
|
|
1132 |
|
|
public boolean hasNext() { |
1133 |
dl |
1.2 |
boolean valid; |
1134 |
dl |
1.1 |
int i = cursor; |
1135 |
dl |
1.2 |
for (;;) { |
1136 |
|
|
if (i >= fence || i < 0 || i >= items.length) { |
1137 |
|
|
valid = false; |
1138 |
|
|
break; |
1139 |
|
|
} |
1140 |
|
|
next = items[i]; |
1141 |
dl |
1.1 |
if (lock.getSequence() == seq) { |
1142 |
dl |
1.2 |
valid = true; |
1143 |
|
|
break; |
1144 |
dl |
1.1 |
} |
1145 |
|
|
refresh(); |
1146 |
|
|
} |
1147 |
dl |
1.2 |
return validNext = valid; |
1148 |
dl |
1.1 |
} |
1149 |
|
|
|
1150 |
|
|
public boolean hasPrevious() { |
1151 |
dl |
1.2 |
boolean valid; |
1152 |
|
|
int i = cursor - 1; |
1153 |
|
|
for (;;) { |
1154 |
|
|
if (i >= fence || i < 0 || i >= items.length) { |
1155 |
|
|
valid = false; |
1156 |
|
|
break; |
1157 |
|
|
} |
1158 |
|
|
prev = items[i]; |
1159 |
dl |
1.1 |
if (lock.getSequence() == seq) { |
1160 |
dl |
1.2 |
valid = true; |
1161 |
|
|
break; |
1162 |
dl |
1.1 |
} |
1163 |
|
|
refresh(); |
1164 |
|
|
} |
1165 |
dl |
1.2 |
return validPrev = valid; |
1166 |
dl |
1.1 |
} |
1167 |
|
|
|
1168 |
|
|
public E next() { |
1169 |
dl |
1.2 |
if (validNext || hasNext()) { |
1170 |
|
|
validNext = false; |
1171 |
|
|
lastRet = cursor++; |
1172 |
|
|
return (E) next; |
1173 |
|
|
} |
1174 |
|
|
throw new NoSuchElementException(); |
1175 |
dl |
1.1 |
} |
1176 |
|
|
|
1177 |
|
|
public E previous() { |
1178 |
dl |
1.2 |
if (validPrev || hasPrevious()) { |
1179 |
|
|
validPrev = false; |
1180 |
|
|
lastRet = cursor--; |
1181 |
|
|
return (E) prev; |
1182 |
|
|
} |
1183 |
|
|
throw new NoSuchElementException(); |
1184 |
dl |
1.1 |
} |
1185 |
|
|
|
1186 |
|
|
public void remove() { |
1187 |
|
|
int i = lastRet; |
1188 |
|
|
if (i < 0) |
1189 |
|
|
throw new IllegalStateException(); |
1190 |
|
|
lock.lock(); |
1191 |
|
|
try { |
1192 |
|
|
if (i < list.count) |
1193 |
|
|
list.remove(i); |
1194 |
|
|
} finally { |
1195 |
|
|
lock.unlock(); |
1196 |
|
|
} |
1197 |
|
|
cursor = i; |
1198 |
|
|
lastRet = -1; |
1199 |
|
|
refresh(); |
1200 |
|
|
} |
1201 |
|
|
|
1202 |
|
|
public void set(E e) { |
1203 |
|
|
int i = lastRet; |
1204 |
|
|
if (i < 0) |
1205 |
|
|
throw new IllegalStateException(); |
1206 |
|
|
lock.lock(); |
1207 |
|
|
try { |
1208 |
|
|
if (i < list.count) |
1209 |
|
|
list.set(i, e); |
1210 |
|
|
} finally { |
1211 |
|
|
lock.unlock(); |
1212 |
|
|
} |
1213 |
|
|
refresh(); |
1214 |
|
|
} |
1215 |
|
|
|
1216 |
|
|
public void add(E e) { |
1217 |
|
|
int i = cursor; |
1218 |
|
|
if (i < 0) |
1219 |
|
|
throw new IllegalStateException(); |
1220 |
|
|
lock.lock(); |
1221 |
|
|
try { |
1222 |
|
|
if (i <= list.count) |
1223 |
|
|
list.add(i, e); |
1224 |
|
|
} finally { |
1225 |
|
|
lock.unlock(); |
1226 |
|
|
} |
1227 |
|
|
cursor = i + 1; |
1228 |
|
|
lastRet = -1; |
1229 |
|
|
refresh(); |
1230 |
|
|
} |
1231 |
|
|
|
1232 |
|
|
public boolean hasMoreElements() { return hasNext(); } |
1233 |
|
|
public E nextElement() { return next(); } |
1234 |
|
|
public int nextIndex() { return cursor; } |
1235 |
|
|
public int previousIndex() { return cursor - 1; } |
1236 |
|
|
} |
1237 |
|
|
|
1238 |
|
|
static final class ReadMostlyVectorSublist<E> implements List<E>, RandomAccess, java.io.Serializable { |
1239 |
|
|
final ReadMostlyVector<E> list; |
1240 |
|
|
final int offset; |
1241 |
|
|
volatile int size; |
1242 |
|
|
|
1243 |
|
|
ReadMostlyVectorSublist(ReadMostlyVector<E> list, int offset, int size) { |
1244 |
|
|
this.list = list; |
1245 |
|
|
this.offset = offset; |
1246 |
|
|
this.size = size; |
1247 |
|
|
} |
1248 |
|
|
|
1249 |
|
|
private void rangeCheck(int index) { |
1250 |
|
|
if (index < 0 || index >= size) |
1251 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
1252 |
|
|
} |
1253 |
|
|
|
1254 |
|
|
public boolean add(E element) { |
1255 |
|
|
SequenceLock lock = list.lock; |
1256 |
|
|
lock.lock(); |
1257 |
|
|
try { |
1258 |
|
|
int c = size; |
1259 |
|
|
list.internalAddAt(c + offset, element); |
1260 |
|
|
size = c + 1; |
1261 |
|
|
} finally { |
1262 |
|
|
lock.unlock(); |
1263 |
|
|
} |
1264 |
|
|
return true; |
1265 |
|
|
} |
1266 |
|
|
|
1267 |
|
|
public void add(int index, E element) { |
1268 |
|
|
SequenceLock lock = list.lock; |
1269 |
|
|
lock.lock(); |
1270 |
|
|
try { |
1271 |
|
|
if (index < 0 || index > size) |
1272 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
1273 |
|
|
list.internalAddAt(index + offset, element); |
1274 |
|
|
++size; |
1275 |
|
|
} finally { |
1276 |
|
|
lock.unlock(); |
1277 |
|
|
} |
1278 |
|
|
} |
1279 |
|
|
|
1280 |
|
|
public boolean addAll(Collection<? extends E> c) { |
1281 |
|
|
Object[] elements = c.toArray(); |
1282 |
|
|
int added; |
1283 |
|
|
SequenceLock lock = list.lock; |
1284 |
|
|
lock.lock(); |
1285 |
|
|
try { |
1286 |
|
|
int s = size; |
1287 |
|
|
int pc = list.count; |
1288 |
|
|
list.internalAddAllAt(offset + s, elements); |
1289 |
|
|
added = list.count - pc; |
1290 |
|
|
size = s + added; |
1291 |
|
|
} finally { |
1292 |
|
|
lock.unlock(); |
1293 |
|
|
} |
1294 |
|
|
return added != 0; |
1295 |
|
|
} |
1296 |
|
|
|
1297 |
|
|
public boolean addAll(int index, Collection<? extends E> c) { |
1298 |
|
|
Object[] elements = c.toArray(); |
1299 |
|
|
int added; |
1300 |
|
|
SequenceLock lock = list.lock; |
1301 |
|
|
lock.lock(); |
1302 |
|
|
try { |
1303 |
|
|
int s = size; |
1304 |
|
|
if (index < 0 || index > s) |
1305 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
1306 |
|
|
int pc = list.count; |
1307 |
|
|
list.internalAddAllAt(index + offset, elements); |
1308 |
|
|
added = list.count - pc; |
1309 |
|
|
size = s + added; |
1310 |
|
|
} finally { |
1311 |
|
|
lock.unlock(); |
1312 |
|
|
} |
1313 |
|
|
return added != 0; |
1314 |
|
|
} |
1315 |
|
|
|
1316 |
|
|
public void clear() { |
1317 |
|
|
SequenceLock lock = list.lock; |
1318 |
|
|
lock.lock(); |
1319 |
|
|
try { |
1320 |
dl |
1.2 |
list.internalClear(offset, offset + size); |
1321 |
dl |
1.1 |
size = 0; |
1322 |
|
|
} finally { |
1323 |
|
|
lock.unlock(); |
1324 |
|
|
} |
1325 |
|
|
} |
1326 |
|
|
|
1327 |
|
|
public boolean contains(Object o) { |
1328 |
|
|
return indexOf(o) >= 0; |
1329 |
|
|
} |
1330 |
|
|
|
1331 |
|
|
public boolean containsAll(Collection<?> c) { |
1332 |
dl |
1.2 |
return list.internalContainsAll(c, offset, offset + size); |
1333 |
dl |
1.1 |
} |
1334 |
|
|
|
1335 |
|
|
public boolean equals(Object o) { |
1336 |
|
|
if (o == this) |
1337 |
|
|
return true; |
1338 |
|
|
if (!(o instanceof List)) |
1339 |
|
|
return false; |
1340 |
dl |
1.2 |
return list.internalEquals((List<?>)(o), offset, offset + size); |
1341 |
dl |
1.1 |
} |
1342 |
|
|
|
1343 |
|
|
public E get(int index) { |
1344 |
|
|
if (index < 0 || index >= size) |
1345 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
1346 |
|
|
return list.get(index + offset); |
1347 |
|
|
} |
1348 |
|
|
|
1349 |
|
|
public int hashCode() { |
1350 |
dl |
1.2 |
return list.internalHashCode(offset, offset + size); |
1351 |
dl |
1.1 |
} |
1352 |
|
|
|
1353 |
|
|
public int indexOf(Object o) { |
1354 |
|
|
SequenceLock lock = list.lock; |
1355 |
|
|
long seq = lock.awaitAvailability(); |
1356 |
|
|
Object[] items = list.array; |
1357 |
|
|
int c = list.count; |
1358 |
|
|
if (c <= items.length) { |
1359 |
dl |
1.2 |
int idx = list.validatedIndexOf(o, items, offset, offset+size, seq); |
1360 |
dl |
1.1 |
if (lock.getSequence() == seq) |
1361 |
|
|
return idx < 0 ? -1 : idx - offset; |
1362 |
|
|
} |
1363 |
|
|
lock.lock(); |
1364 |
|
|
try { |
1365 |
dl |
1.2 |
int idx = list.rawIndexOf(o, offset, offset+size); |
1366 |
dl |
1.1 |
return idx < 0 ? -1 : idx - offset; |
1367 |
|
|
} finally { |
1368 |
|
|
lock.unlock(); |
1369 |
|
|
} |
1370 |
|
|
} |
1371 |
|
|
|
1372 |
|
|
public boolean isEmpty() { |
1373 |
|
|
return size == 0; |
1374 |
|
|
} |
1375 |
|
|
|
1376 |
|
|
public Iterator<E> iterator() { |
1377 |
|
|
return new SubItr(this, offset); |
1378 |
|
|
} |
1379 |
|
|
|
1380 |
|
|
public int lastIndexOf(Object o) { |
1381 |
|
|
SequenceLock lock = list.lock; |
1382 |
|
|
long seq = lock.awaitAvailability(); |
1383 |
|
|
Object[] items = list.array; |
1384 |
|
|
int c = list.count; |
1385 |
|
|
if (c <= items.length) { |
1386 |
dl |
1.2 |
int idx = list.validatedLastIndexOf(o, items, offset+size-1, |
1387 |
|
|
offset, seq); |
1388 |
dl |
1.1 |
if (lock.getSequence() == seq) |
1389 |
|
|
return idx < 0 ? -1 : idx - offset; |
1390 |
|
|
} |
1391 |
|
|
lock.lock(); |
1392 |
|
|
try { |
1393 |
dl |
1.2 |
int idx = list.rawLastIndexOf(o, offset + size - 1, offset); |
1394 |
dl |
1.1 |
return idx < 0 ? -1 : idx - offset; |
1395 |
|
|
} finally { |
1396 |
|
|
lock.unlock(); |
1397 |
|
|
} |
1398 |
|
|
} |
1399 |
|
|
|
1400 |
|
|
public ListIterator<E> listIterator() { |
1401 |
|
|
return new SubItr(this, offset); |
1402 |
|
|
} |
1403 |
|
|
|
1404 |
|
|
public ListIterator<E> listIterator(int index) { |
1405 |
|
|
return new SubItr(this, index + offset); |
1406 |
|
|
} |
1407 |
|
|
|
1408 |
|
|
public E remove(int index) { |
1409 |
dl |
1.2 |
Object result; |
1410 |
dl |
1.1 |
SequenceLock lock = list.lock; |
1411 |
|
|
lock.lock(); |
1412 |
|
|
try { |
1413 |
|
|
if (index < 0 || index >= size) |
1414 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
1415 |
|
|
int i = index + offset; |
1416 |
dl |
1.2 |
result = list.array[i]; |
1417 |
dl |
1.1 |
list.internalRemoveAt(i); |
1418 |
|
|
size--; |
1419 |
|
|
} finally { |
1420 |
|
|
lock.unlock(); |
1421 |
|
|
} |
1422 |
dl |
1.2 |
return (E)result; |
1423 |
dl |
1.1 |
} |
1424 |
|
|
|
1425 |
|
|
public boolean remove(Object o) { |
1426 |
|
|
boolean removed = false; |
1427 |
|
|
SequenceLock lock = list.lock; |
1428 |
|
|
lock.lock(); |
1429 |
|
|
try { |
1430 |
dl |
1.2 |
if (list.internalRemoveAt(list.rawIndexOf(o, offset, |
1431 |
|
|
offset + size))) { |
1432 |
dl |
1.1 |
removed = true; |
1433 |
|
|
--size; |
1434 |
|
|
} |
1435 |
|
|
} finally { |
1436 |
|
|
lock.unlock(); |
1437 |
|
|
} |
1438 |
|
|
return removed; |
1439 |
|
|
} |
1440 |
|
|
|
1441 |
|
|
public boolean removeAll(Collection<?> c) { |
1442 |
dl |
1.2 |
return list.internalRemoveAll(c, offset, offset + size); |
1443 |
dl |
1.1 |
} |
1444 |
|
|
|
1445 |
|
|
public boolean retainAll(Collection<?> c) { |
1446 |
dl |
1.2 |
return list.internalRetainAll(c, offset, offset + size); |
1447 |
dl |
1.1 |
} |
1448 |
|
|
|
1449 |
|
|
public E set(int index, E element) { |
1450 |
|
|
if (index < 0 || index >= size) |
1451 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
1452 |
|
|
return list.set(index+offset, element); |
1453 |
|
|
} |
1454 |
|
|
|
1455 |
|
|
public int size() { |
1456 |
|
|
return size; |
1457 |
|
|
} |
1458 |
|
|
|
1459 |
|
|
public List<E> subList(int fromIndex, int toIndex) { |
1460 |
|
|
int c = size; |
1461 |
|
|
int ssize = toIndex - fromIndex; |
1462 |
|
|
if (fromIndex < 0 || toIndex > c || ssize < 0) |
1463 |
|
|
throw new IndexOutOfBoundsException(); |
1464 |
|
|
return new ReadMostlyVectorSublist(list, offset+fromIndex, ssize); |
1465 |
|
|
} |
1466 |
|
|
|
1467 |
|
|
public Object[] toArray() { |
1468 |
dl |
1.2 |
return list.internalToArray(offset, offset + size); |
1469 |
dl |
1.1 |
} |
1470 |
|
|
|
1471 |
|
|
public <T> T[] toArray(T[] a) { |
1472 |
dl |
1.2 |
return list.internalToArray(a, offset, offset + size); |
1473 |
dl |
1.1 |
} |
1474 |
|
|
|
1475 |
|
|
public String toString() { |
1476 |
dl |
1.2 |
return list.internalToString(offset, offset + size); |
1477 |
dl |
1.1 |
} |
1478 |
|
|
|
1479 |
|
|
} |
1480 |
|
|
|
1481 |
|
|
static final class SubItr<E> implements ListIterator<E> { |
1482 |
|
|
final ReadMostlyVectorSublist<E> sublist; |
1483 |
|
|
final ReadMostlyVector<E> list; |
1484 |
|
|
final SequenceLock lock; |
1485 |
|
|
Object[] items; |
1486 |
|
|
Object next, prev; |
1487 |
|
|
long seq; |
1488 |
|
|
int cursor; |
1489 |
|
|
int fence; |
1490 |
|
|
int lastRet; |
1491 |
dl |
1.2 |
boolean validNext, validPrev; |
1492 |
dl |
1.1 |
|
1493 |
|
|
SubItr(ReadMostlyVectorSublist<E> sublist, int index) { |
1494 |
|
|
this.sublist = sublist; |
1495 |
|
|
this.list = sublist.list; |
1496 |
|
|
this.lock = list.lock; |
1497 |
|
|
this.cursor = index; |
1498 |
|
|
this.lastRet = -1; |
1499 |
|
|
refresh(); |
1500 |
|
|
if (index < 0 || index > fence) |
1501 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
1502 |
|
|
} |
1503 |
|
|
|
1504 |
|
|
private void refresh() { |
1505 |
dl |
1.2 |
validNext = validPrev = false; |
1506 |
dl |
1.1 |
do { |
1507 |
dl |
1.2 |
int n; |
1508 |
dl |
1.1 |
seq = lock.awaitAvailability(); |
1509 |
|
|
items = list.array; |
1510 |
dl |
1.2 |
if ((n = list.count) > items.length) |
1511 |
|
|
continue; |
1512 |
dl |
1.1 |
int b = sublist.offset + sublist.size; |
1513 |
dl |
1.2 |
fence = b < n ? b : n; |
1514 |
dl |
1.1 |
} while (lock.getSequence() != seq); |
1515 |
|
|
} |
1516 |
|
|
|
1517 |
|
|
public boolean hasNext() { |
1518 |
dl |
1.2 |
boolean valid; |
1519 |
dl |
1.1 |
int i = cursor; |
1520 |
dl |
1.2 |
for (;;) { |
1521 |
|
|
if (i >= fence || i < 0 || i >= items.length) { |
1522 |
|
|
valid = false; |
1523 |
|
|
break; |
1524 |
|
|
} |
1525 |
|
|
next = items[i]; |
1526 |
dl |
1.1 |
if (lock.getSequence() == seq) { |
1527 |
dl |
1.2 |
valid = true; |
1528 |
|
|
break; |
1529 |
dl |
1.1 |
} |
1530 |
|
|
refresh(); |
1531 |
|
|
} |
1532 |
dl |
1.2 |
return validNext = valid; |
1533 |
dl |
1.1 |
} |
1534 |
|
|
|
1535 |
|
|
public boolean hasPrevious() { |
1536 |
dl |
1.2 |
boolean valid; |
1537 |
|
|
int i = cursor - 1; |
1538 |
|
|
for (;;) { |
1539 |
|
|
if (i >= fence || i < 0 || i >= items.length) { |
1540 |
|
|
valid = false; |
1541 |
|
|
break; |
1542 |
|
|
} |
1543 |
|
|
prev = items[i]; |
1544 |
dl |
1.1 |
if (lock.getSequence() == seq) { |
1545 |
dl |
1.2 |
valid = true; |
1546 |
|
|
break; |
1547 |
dl |
1.1 |
} |
1548 |
|
|
refresh(); |
1549 |
|
|
} |
1550 |
dl |
1.2 |
return validPrev = valid; |
1551 |
dl |
1.1 |
} |
1552 |
|
|
|
1553 |
|
|
public E next() { |
1554 |
dl |
1.2 |
if (validNext || hasNext()) { |
1555 |
|
|
validNext = false; |
1556 |
|
|
lastRet = cursor++; |
1557 |
|
|
return (E) next; |
1558 |
|
|
} |
1559 |
|
|
throw new NoSuchElementException(); |
1560 |
dl |
1.1 |
} |
1561 |
|
|
|
1562 |
|
|
public E previous() { |
1563 |
dl |
1.2 |
if (validPrev || hasPrevious()) { |
1564 |
|
|
validPrev = false; |
1565 |
|
|
lastRet = cursor--; |
1566 |
|
|
return (E) prev; |
1567 |
|
|
} |
1568 |
|
|
throw new NoSuchElementException(); |
1569 |
dl |
1.1 |
} |
1570 |
|
|
|
1571 |
|
|
public int nextIndex() { |
1572 |
|
|
return cursor - sublist.offset; |
1573 |
|
|
} |
1574 |
|
|
|
1575 |
|
|
public int previousIndex() { |
1576 |
|
|
return cursor - 1 - sublist.offset; |
1577 |
|
|
} |
1578 |
|
|
|
1579 |
|
|
public void remove() { |
1580 |
|
|
int i = lastRet; |
1581 |
|
|
if (i < 0) |
1582 |
|
|
throw new IllegalStateException(); |
1583 |
|
|
cursor = i; |
1584 |
|
|
lastRet = -1; |
1585 |
|
|
lock.lock(); |
1586 |
|
|
try { |
1587 |
|
|
if (i < list.count) { |
1588 |
|
|
list.remove(i); |
1589 |
|
|
--sublist.size; |
1590 |
|
|
} |
1591 |
|
|
} finally { |
1592 |
|
|
lock.unlock(); |
1593 |
|
|
} |
1594 |
|
|
refresh(); |
1595 |
|
|
} |
1596 |
|
|
|
1597 |
|
|
public void set(E e) { |
1598 |
|
|
int i = lastRet; |
1599 |
|
|
if (i < 0) |
1600 |
|
|
throw new IllegalStateException(); |
1601 |
|
|
lock.lock(); |
1602 |
|
|
try { |
1603 |
|
|
if (i < list.count) |
1604 |
|
|
list.set(i, e); |
1605 |
|
|
} finally { |
1606 |
|
|
lock.unlock(); |
1607 |
|
|
} |
1608 |
|
|
refresh(); |
1609 |
|
|
} |
1610 |
|
|
|
1611 |
|
|
public void add(E e) { |
1612 |
|
|
int i = cursor; |
1613 |
|
|
if (i < 0) |
1614 |
|
|
throw new IllegalStateException(); |
1615 |
|
|
cursor = i + 1; |
1616 |
|
|
lastRet = -1; |
1617 |
|
|
lock.lock(); |
1618 |
|
|
try { |
1619 |
|
|
if (i <= list.count) { |
1620 |
|
|
list.add(i, e); |
1621 |
|
|
++sublist.size; |
1622 |
|
|
} |
1623 |
|
|
} finally { |
1624 |
|
|
lock.unlock(); |
1625 |
|
|
} |
1626 |
|
|
refresh(); |
1627 |
|
|
} |
1628 |
|
|
|
1629 |
|
|
} |
1630 |
|
|
} |
1631 |
|
|
|