org.eclipse.persistence.internal.helper.NonSynchronizedVector Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of eclipselink Show documentation
Show all versions of eclipselink Show documentation
EclipseLink build based upon Git transaction f2b9fc5
/*
* Copyright (c) 1998, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.internal.helper;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.StreamCorruptedException;
import java.util.*;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.function.UnaryOperator;
/**
* Vector subclass that removes the synchronization.
*/
public class NonSynchronizedVector extends Vector {
public static NonSynchronizedVector newInstance(int initialCapacity, int capacityIncrement) {
return new NonSynchronizedVector(initialCapacity, capacityIncrement);
}
public static NonSynchronizedVector newInstance(int initialCapacity) {
return new NonSynchronizedVector(initialCapacity);
}
public static NonSynchronizedVector newInstance() {
return new NonSynchronizedVector<>();
}
public static NonSynchronizedVector newInstance(Collection c) {
return new NonSynchronizedVector<>(c);
}
public NonSynchronizedVector(int initialCapacity, int capacityIncrement) {
super(initialCapacity, capacityIncrement);
}
public NonSynchronizedVector(int initialCapacity) {
super(initialCapacity);
}
public NonSynchronizedVector() {
super();
}
public NonSynchronizedVector(Collection c) {
super(c);
}
@Override
public void copyInto(Object[] anArray) {
System.arraycopy(elementData, 0, anArray, 0, elementCount);
}
@Override
public void trimToSize() {
modCount++;
int oldCapacity = elementData.length;
if (elementCount < oldCapacity) {
elementData = Arrays.copyOf(elementData, elementCount);
}
}
@Override
public void ensureCapacity(int minCapacity) {
if (minCapacity > 0) {
modCount++;
if (minCapacity > elementData.length)
grow(minCapacity);
}
}
private Object[] grow(int minCapacity) {
int oldCapacity = elementData.length;
int newCapacity = newLength(oldCapacity, minCapacity - oldCapacity,
capacityIncrement > 0 ? capacityIncrement : oldCapacity);
return elementData = Arrays.copyOf(elementData, newCapacity);
}
private int newLength(int oldLength, int minGrowth, int prefGrowth) {
int prefLength = oldLength + Math.max(minGrowth, prefGrowth); // might overflow
if (0 < prefLength && prefLength <= Integer.MAX_VALUE - 16) {
return prefLength;
}
throw new OutOfMemoryError("Required array length is too large");
}
private Object[] grow() {
return grow(elementCount + 1);
}
// private void ensureCapacityHelper(int minCapacity) {
// int oldCapacity = elementData.length;
// if (minCapacity > oldCapacity) {
// Object oldData[] = elementData;
// int newCapacity = (capacityIncrement > 0) ?
// (oldCapacity + capacityIncrement) : (oldCapacity * 2);
// if (newCapacity < minCapacity) {
// newCapacity = minCapacity;
// }
// elementData = new Object[newCapacity];
// System.arraycopy(oldData, 0, elementData, 0, elementCount);
// }
// }
@Override
public void setSize(int newSize) {
modCount++;
if (newSize > elementData.length)
grow(newSize);
final Object[] es = elementData;
for (int to = elementCount, i = newSize; i < to; i++)
es[i] = null;
elementCount = newSize;
}
@Override
public int capacity() {
return elementData.length;
}
@Override
public Object clone() {
return new NonSynchronizedVector<>(this);
}
@Override
public int size() {
return elementCount;
}
@Override
public boolean isEmpty() {
return elementCount == 0;
}
@Override
public Enumeration elements() {
return new Enumeration() {
int count = 0;
public boolean hasMoreElements() {
return count < elementCount;
}
public E nextElement() {
if (count < elementCount) {
return elementData(count++);
}
throw new NoSuchElementException("Vector Enumeration");
}
};
}
@Override
public int indexOf(Object elem, int index) {
if (elem == null) {
for (int i = index ; i < elementCount ; i++)
if (elementData[i]==null)
return i;
} else {
for (int i = index ; i < elementCount ; i++)
if (elem.equals(elementData[i]))
return i;
}
return -1;
}
@Override
public int lastIndexOf(Object elem) {
return lastIndexOf(elem, elementCount-1);
}
@Override
public int lastIndexOf(Object elem, int index) {
if (index >= elementCount)
throw new IndexOutOfBoundsException(index + " >= "+ elementCount);
if (elem == null) {
for (int i = index; i >= 0; i--)
if (elementData[i]==null)
return i;
} else {
for (int i = index; i >= 0; i--)
if (elem.equals(elementData[i]))
return i;
}
return -1;
}
@Override
public E elementAt(int index) {
if (index >= elementCount) {
throw new ArrayIndexOutOfBoundsException(index + " >= " + elementCount);
}
return elementData(index);
}
@Override
public E firstElement() {
if (elementCount == 0) {
throw new NoSuchElementException();
}
return elementData(0);
}
@Override
public E lastElement() {
if (elementCount == 0) {
throw new NoSuchElementException();
}
return elementData(elementCount - 1);
}
@Override
public void setElementAt(E obj, int index) {
if (index >= elementCount) {
throw new ArrayIndexOutOfBoundsException(index + " >= " +
elementCount);
}
elementData[index] = obj;
}
@Override
public void removeElementAt(int index) {
if (index >= elementCount) {
throw new ArrayIndexOutOfBoundsException(index + " >= " +
elementCount);
}
else if (index < 0) {
throw new ArrayIndexOutOfBoundsException(index);
}
int j = elementCount - index - 1;
if (j > 0) {
System.arraycopy(elementData, index + 1, elementData, index, j);
}
modCount++;
elementCount--;
elementData[elementCount] = null; /* to let gc do its work */
}
@Override
public void insertElementAt(E obj, int index) {
if (index > elementCount) {
throw new ArrayIndexOutOfBoundsException(index
+ " > " + elementCount);
}
modCount++;
final int s = elementCount;
Object[] elementData = this.elementData;
if (s == elementData.length)
elementData = grow();
System.arraycopy(elementData, index,
elementData, index + 1,
s - index);
elementData[index] = obj;
elementCount = s + 1;
}
@Override
public void addElement(E obj) {
modCount++;
add(obj, elementData, elementCount);
}
@Override
public boolean removeElement(Object obj) {
modCount++;
int i = indexOf(obj);
if (i >= 0) {
removeElementAt(i);
return true;
}
return false;
}
@Override
public void removeAllElements() {
final Object[] es = elementData;
for (int to = elementCount, i = elementCount = 0; i < to; i++)
es[i] = null;
modCount++;
}
@Override
public Object[] toArray() {
return Arrays.copyOf(elementData, elementCount);
}
@Override
@SuppressWarnings({"unchecked"})
public T[] toArray(T[] a) {
if (a.length < elementCount)
return (T[]) Arrays.copyOf(elementData, elementCount, a.getClass());
System.arraycopy(elementData, 0, a, 0, elementCount);
if (a.length > elementCount)
a[elementCount] = null;
return a;
}
@SuppressWarnings("unchecked")
E elementData(int index) {
return (E) elementData[index];
}
@SuppressWarnings("unchecked")
static E elementAt(Object[] es, int index) {
return (E) es[index];
}
@Override
public E get(int index) {
if (index >= elementCount)
throw new ArrayIndexOutOfBoundsException(index);
return elementData(index);
}
@Override
public E set(int index, E element) {
if (index >= elementCount)
throw new ArrayIndexOutOfBoundsException(index);
E oldValue = elementData(index);
elementData[index] = element;
return oldValue;
}
private void add(E e, Object[] elementData, int s) {
if (s == elementData.length)
elementData = grow();
elementData[s] = e;
elementCount = s + 1;
}
@Override
public boolean add(E o) {
modCount++;
add(o, elementData, elementCount);
return true;
}
@Override
public E remove(int index) {
modCount++;
if (index >= elementCount)
throw new ArrayIndexOutOfBoundsException(index);
E oldValue = elementData(index);
int numMoved = elementCount - index - 1;
if (numMoved > 0)
System.arraycopy(elementData, index+1, elementData, index,
numMoved);
elementData[--elementCount] = null; // Let gc do its work
return oldValue;
}
@Override
public boolean containsAll(Collection c) {
for (Object e : c)
if (!contains(e))
return false;
return true;
}
@Override
public boolean addAll(Collection c) {
Object[] a = c.toArray();
modCount++;
int numNew = a.length;
if (numNew == 0)
return false;
Object[] elementData = this.elementData;
final int s = elementCount;
if (numNew > elementData.length - s)
elementData = grow(s + numNew);
System.arraycopy(a, 0, elementData, s, numNew);
elementCount = s + numNew;
return true;
}
private static long[] nBits(int n) {
return new long[((n - 1) >> 6) + 1];
}
private static void setBit(long[] bits, int i) {
bits[i >> 6] |= 1L << i;
}
private static boolean isClear(long[] bits, int i) {
return (bits[i >> 6] & (1L << i)) == 0;
}
private boolean bulkRemove(Predicate filter) {
int expectedModCount = modCount;
final Object[] es = elementData;
final int end = elementCount;
int i;
// Optimize for initial run of survivors
for (i = 0; i < end && !filter.test(elementAt(es, i)); i++)
;
// Tolerate predicates that reentrantly access the collection for
// read (but writers still get CME), so traverse once to find
// elements to delete, a second pass to physically expunge.
if (i < end) {
final int beg = i;
final long[] deathRow = nBits(end - beg);
deathRow[0] = 1L; // set bit 0
for (i = beg + 1; i < end; i++)
if (filter.test(elementAt(es, i)))
setBit(deathRow, i - beg);
if (modCount != expectedModCount)
throw new ConcurrentModificationException();
modCount++;
int w = beg;
for (i = beg; i < end; i++)
if (isClear(deathRow, i - beg))
es[w++] = es[i];
for (i = elementCount = w; i < end; i++)
es[i] = null;
return true;
} else {
if (modCount != expectedModCount)
throw new ConcurrentModificationException();
return false;
}
}
@Override
public boolean removeAll(Collection c) {
Objects.requireNonNull(c);
return bulkRemove(e -> c.contains(e));
}
@Override
public boolean retainAll(Collection c) {
Objects.requireNonNull(c);
return bulkRemove(e -> !c.contains(e));
}
@Override
public boolean addAll(int index, Collection c) {
if (index < 0 || index > elementCount)
throw new ArrayIndexOutOfBoundsException(index);
Object[] a = c.toArray();
modCount++;
int numNew = a.length;
if (numNew == 0)
return false;
Object[] elementData = this.elementData;
final int s = elementCount;
if (numNew > elementData.length - s)
elementData = grow(s + numNew);
int numMoved = s - index;
if (numMoved > 0)
System.arraycopy(elementData, index,
elementData, index + numNew,
numMoved);
System.arraycopy(a, 0, elementData, index, numNew);
elementCount = s + numNew;
return true;
}
@Override
public boolean equals(Object o) {
if (o == this)
return true;
if (!(o instanceof List))
return false;
ListIterator e1 = listIterator();
ListIterator e2 = ((List) o).listIterator();
while (e1.hasNext() && e2.hasNext()) {
E o1 = e1.next();
Object o2 = e2.next();
if (!(o1==null ? o2==null : o1.equals(o2)))
return false;
}
return !(e1.hasNext() || e2.hasNext());
}
@Override
public int hashCode() {
int hashCode = 1;
for (E e : this)
hashCode = 31*hashCode + (e==null ? 0 : e.hashCode());
return hashCode;
}
@Override
public String toString() {
Iterator it = iterator();
if (! it.hasNext())
return "[]";
StringBuilder sb = new StringBuilder();
sb.append('[');
for (;;) {
E e = it.next();
sb.append(e == this ? "(this Collection)" : e);
if (! it.hasNext())
return sb.append(']').toString();
sb.append(',').append(' ');
}
}
@Override
public List subList(int fromIndex, int toIndex) {
return new NonSynchronizedSubVector(this, fromIndex, toIndex);
}
@Override
protected void removeRange(int fromIndex, int toIndex) {
modCount++;
shiftTailOverGap(elementData, fromIndex, toIndex);
}
private void shiftTailOverGap(Object[] es, int lo, int hi) {
System.arraycopy(es, hi, es, lo, elementCount - hi);
for (int to = elementCount, i = (elementCount -= hi - lo); i < to; i++)
es[i] = null;
}
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException {
in.defaultReadObject();
}
private void writeObject(java.io.ObjectOutputStream s)
throws java.io.IOException {
s.defaultWriteObject();
}
public ListIterator listIterator(int index) {
if (index < 0 || index > elementCount)
throw new IndexOutOfBoundsException("Index: "+index);
return new ListItr(index);
}
public ListIterator listIterator() {
return new ListItr(0);
}
public Iterator iterator() {
return new Itr();
}
private class Itr implements Iterator {
int cursor; // index of next element to return
int lastRet = -1; // index of last element returned; -1 if no such
int expectedModCount = modCount;
public boolean hasNext() {
// Racy but within spec, since modifications are checked
// within or after synchronization in next/previous
return cursor != elementCount;
}
public E next() {
checkForComodification();
int i = cursor;
if (i >= elementCount)
throw new NoSuchElementException();
cursor = i + 1;
return elementData(lastRet = i);
}
public void remove() {
if (lastRet == -1)
throw new IllegalStateException();
checkForComodification();
NonSynchronizedVector.this.remove(lastRet);
expectedModCount = modCount;
cursor = lastRet;
lastRet = -1;
}
@Override
public void forEachRemaining(Consumer action) {
Objects.requireNonNull(action);
final int size = elementCount;
int i = cursor;
if (i >= size) {
return;
}
final Object[] es = elementData;
if (i >= es.length)
throw new ConcurrentModificationException();
while (i < size && modCount == expectedModCount)
action.accept(elementAt(es, i++));
// update once at end of iteration to reduce heap write traffic
cursor = i;
lastRet = i - 1;
checkForComodification();
}
final void checkForComodification() {
if (modCount != expectedModCount)
throw new ConcurrentModificationException();
}
}
/**
* An optimized version of AbstractList.ListItr
*/
final class ListItr extends Itr implements ListIterator {
ListItr(int index) {
super();
cursor = index;
}
public boolean hasPrevious() {
return cursor != 0;
}
public int nextIndex() {
return cursor;
}
public int previousIndex() {
return cursor - 1;
}
public E previous() {
checkForComodification();
int i = cursor - 1;
if (i < 0)
throw new NoSuchElementException();
cursor = i;
return elementData(lastRet = i);
}
public void set(E e) {
if (lastRet == -1)
throw new IllegalStateException();
checkForComodification();
NonSynchronizedVector.this.set(lastRet, e);
}
public void add(E e) {
int i = cursor;
checkForComodification();
NonSynchronizedVector.this.add(i, e);
expectedModCount = modCount;
cursor = i + 1;
lastRet = -1;
}
}
@Override
public void forEach(Consumer action) {
Objects.requireNonNull(action);
final int expectedModCount = modCount;
final Object[] es = elementData;
final int size = elementCount;
for (int i = 0; modCount == expectedModCount && i < size; i++)
action.accept(elementAt(es, i));
if (modCount != expectedModCount)
throw new ConcurrentModificationException();
}
/**
* @throws NullPointerException {@inheritDoc}
*/
@Override
public void replaceAll(UnaryOperator operator) {
Objects.requireNonNull(operator);
final ListIterator li = this.listIterator();
while (li.hasNext()) {
li.set(operator.apply(li.next()));
}
}
@Override
@SuppressWarnings({"unchecked", "rawtypes"})
public void sort(Comparator c) {
Object[] a = this.toArray();
Arrays.sort(a, (Comparator) c);
ListIterator i = this.listIterator();
for (Object e : a) {
i.next();
i.set((E) e);
}
}
@Override
public Spliterator spliterator() {
return new VectorSpliterator(null, 0, -1, 0);
}
/** Similar to ArrayList Spliterator */
final class VectorSpliterator implements Spliterator {
private Object[] array;
private int index; // current index, modified on advance/split
private int fence; // -1 until used; then one past last index
private int expectedModCount; // initialized when fence set
/** Creates new spliterator covering the given range. */
VectorSpliterator(Object[] array, int origin, int fence,
int expectedModCount) {
this.array = array;
this.index = origin;
this.fence = fence;
this.expectedModCount = expectedModCount;
}
private int getFence() { // initialize on first use
int hi;
if ((hi = fence) < 0) {
array = elementData;
expectedModCount = modCount;
hi = fence = elementCount;
}
return hi;
}
public Spliterator trySplit() {
int hi = getFence(), lo = index, mid = (lo + hi) >>> 1;
return (lo >= mid) ? null :
new VectorSpliterator(array, lo, index = mid, expectedModCount);
}
@SuppressWarnings("unchecked")
public boolean tryAdvance(Consumer action) {
Objects.requireNonNull(action);
int i;
if (getFence() > (i = index)) {
index = i + 1;
action.accept((E)array[i]);
if (modCount != expectedModCount)
throw new ConcurrentModificationException();
return true;
}
return false;
}
@SuppressWarnings("unchecked")
public void forEachRemaining(Consumer action) {
Objects.requireNonNull(action);
final int hi = getFence();
final Object[] a = array;
int i;
for (i = index, index = hi; i < hi; i++)
action.accept((E) a[i]);
if (modCount != expectedModCount)
throw new ConcurrentModificationException();
}
public long estimateSize() {
return getFence() - index;
}
public int characteristics() {
return Spliterator.ORDERED | Spliterator.SIZED | Spliterator.SUBSIZED;
}
}
}