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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/**
 * Copyright (c) 2002-2013 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.helpers.collection;

import java.util.Iterator;

/**
 * Concatenates sub-iterables of an iterable.
 *
 * @see NestingIterator
 * 
 * @param  the type of items.
 * @param  the type of items in the surface item iterator
 */
public abstract class NestingIterable implements Iterable
{
	private final Iterable source;

	public NestingIterable( Iterable source )
	{
		this.source = source;
	}

	public Iterator iterator()
	{
		return new NestingIterator( source.iterator() )
		{
			@Override
			protected Iterator createNestedIterator( U item )
			{
				return NestingIterable.this.createNestedIterator( item );
			}
		};
	}

	protected abstract Iterator createNestedIterator( U item );
}