package org.jboss.seam.solder.util.collections;
import java.util.Collection;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
/** Collection iterator for {@code WrappedCollection}. */
public class WrappedIterator<K, V> implements Iterator<V>
{
final Iterator<V> delegateIterator;
final Collection<V> originalDelegate;
private final WrappedCollection<K, V> collection;
WrappedIterator(WrappedCollection<K, V> collection)
{
this.collection = collection;
delegateIterator = collection.getParent().iteratorOrListIterator(collection.delegate);
originalDelegate = collection.delegate;
}
WrappedIterator(Iterator<V> delegateIterator, WrappedCollection<K, V> collection)
{
this.delegateIterator = delegateIterator;
this.collection = collection;
originalDelegate = collection.delegate;
}
/**
* If the delegate changed since the iterator was created, the iterator is no
* longer valid.
*/
void validateIterator()
{
collection.refreshIfEmpty();
if (collection.delegate != originalDelegate)
{
throw new ConcurrentModificationException();
}
}
public boolean hasNext()
{
validateIterator();
return delegateIterator.hasNext();
}
public V next()
{
validateIterator();
return delegateIterator.next();
}
public void remove()
{
delegateIterator.remove();
collection.getParent().totalSize--;
collection.removeIfEmpty();
}
Iterator<V> getDelegateIterator()
{
validateIterator();
return delegateIterator;
}
}