/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.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;
}
}