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package org.apache.commons.collections.bag;
import java.util.Set;
import org.apache.commons.collections.Bag;
import org.apache.commons.collections.collection.SynchronizedCollection;
import org.apache.commons.collections.set.SynchronizedSet;
/**
* Decorates another Bag
to synchronize its behaviour
* for a multi-threaded environment.
*
* Methods are synchronized, then forwarded to the decorated bag.
* Iterators must be separately synchronized around the loop.
*
* @since Commons Collections 3.0
* @version $Revision: 1.4 $ $Date: 2004/01/14 21:43:08 $
*
* @author Stephen Colebourne
*/
public class SynchronizedBag
extends SynchronizedCollection implements Bag {
/**
* Factory method to create a synchronized bag.
*
* @param bag the bag to decorate, must not be null
* @throws IllegalArgumentException if bag is null
*/
public static Bag decorate(Bag bag) {
return new SynchronizedBag(bag);
}
//-----------------------------------------------------------------------
/**
* Constructor that wraps (not copies).
*
* @param bag the bag to decorate, must not be null
* @throws IllegalArgumentException if bag is null
*/
protected SynchronizedBag(Bag bag) {
super(bag);
}
/**
* Constructor that wraps (not copies).
*
* @param bag the bag to decorate, must not be null
* @param lock the lock to use, must not be null
* @throws IllegalArgumentException if bag is null
*/
protected SynchronizedBag(Bag bag, Object lock) {
super(bag, lock);
}
protected Bag getBag() {
return (Bag) collection;
}
//-----------------------------------------------------------------------
public boolean add(Object object, int count) {
synchronized (lock) {
return getBag().add(object, count);
}
}
public boolean remove(Object object, int count) {
synchronized (lock) {
return getBag().remove(object, count);
}
}
public Set uniqueSet() {
synchronized (lock) {
Set set = getBag().uniqueSet();
return new SynchronizedBagSet(set, lock);
}
}
public int getCount(Object object) {
synchronized (lock) {
return getBag().getCount(object);
}
}
//-----------------------------------------------------------------------
/**
* Synchronized Set for the Bag class.
*/
class SynchronizedBagSet extends SynchronizedSet {
SynchronizedBagSet(Set set, Object lock) {
super(set, lock);
}
}
}