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/*******************************************************************************
* Copyright (c) 2009, 2010 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.utility.internal.iterators;
import java.util.List;
import java.util.ListIterator;
import org.eclipse.jpt.utility.internal.StringTools;
import org.eclipse.jpt.utility.internal.iterables.ListIterable;
/**
* Wrap a list iterator and synchronize all its methods so it can be safely shared
* among multiple threads.
*
* @param <E> the type of elements returned by the iterator
*/
public class SynchronizedListIterator<E>
implements ListIterator<E>
{
private final ListIterator<E> listIterator;
/** Object to synchronize on. */
private final Object mutex;
public SynchronizedListIterator(List<E> list) {
this(list.listIterator());
}
public SynchronizedListIterator(List<E> list, Object mutex) {
this(list.listIterator(), mutex);
}
public SynchronizedListIterator(ListIterable<E> listIterable) {
this(listIterable.iterator());
}
public SynchronizedListIterator(ListIterable<E> listIterable, Object mutex) {
this(listIterable.iterator(), mutex);
}
public SynchronizedListIterator(ListIterator<E> listIterator) {
super();
this.listIterator = listIterator;
this.mutex = this;
}
public SynchronizedListIterator(ListIterator<E> listIterator, Object mutex) {
super();
this.listIterator = listIterator;
this.mutex = mutex;
}
public synchronized boolean hasNext() {
synchronized (this.mutex) {
return this.listIterator.hasNext();
}
}
public synchronized E next() {
synchronized (this.mutex) {
return this.listIterator.next();
}
}
public synchronized int nextIndex() {
synchronized (this.mutex) {
return this.listIterator.nextIndex();
}
}
public synchronized boolean hasPrevious() {
synchronized (this.mutex) {
return this.listIterator.hasPrevious();
}
}
public synchronized E previous() {
synchronized (this.mutex) {
return this.listIterator.previous();
}
}
public synchronized int previousIndex() {
synchronized (this.mutex) {
return this.listIterator.previousIndex();
}
}
public synchronized void remove() {
synchronized (this.mutex) {
this.listIterator.remove();
}
}
public synchronized void add(E e) {
synchronized (this.mutex) {
this.listIterator.add(e);
}
}
public synchronized void set(E e) {
synchronized (this.mutex) {
this.listIterator.set(e);
}
}
@Override
public String toString() {
synchronized (this.mutex) {
return StringTools.buildToStringFor(this, this.listIterator);
}
}
}
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