Copyright (c) 2010, 2016 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2010, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.osgi.internal.serviceregistry;

import java.util.*;

public class ShrinkableEntrySetValueCollection<E> extends AbstractCollection<E> implements Collection<E> {
	private final Set<? extends Map.Entry<?, ? extends E>> entrySet;

	public ShrinkableEntrySetValueCollection(Set<? extends Map.Entry<?, ? extends E>> e) {
		if (e == null) {
			throw new NullPointerException();
		}
		entrySet = e;
	}

	@Override
	public void clear() {
		entrySet.clear();
	}

	@Override
	public boolean isEmpty() {
		return entrySet.isEmpty();
	}

	@Override
	public Iterator<E> iterator() {
		return new ValueIterator<>(entrySet.iterator());
	}

	@Override
	public int size() {
		return entrySet.size();
	}

	
Iterator over the values of the entry set.
/**
	 * Iterator over the values of the entry set.
	 */
	static private final class ValueIterator<E> implements Iterator<E> {
		private final Iterator<? extends Map.Entry<?, ? extends E>> iter;

		ValueIterator(Iterator<? extends Map.Entry<?, ? extends E>> i) {
			iter = i;
		}

		@Override
		public boolean hasNext() {
			return iter.hasNext();
		}

		@Override
		public E next() {
			final Map.Entry<?, ? extends E> entry = iter.next();
			return entry.getValue();
		}

		@Override
		public void remove() {
			iter.remove();
		}
	}
}