org.neo4j.helpers.collection.CombiningIterable Maven / Gradle / Ivy

Go to download
/**
 * 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;
import java.util.LinkedList;

/**
 * Combining one or more {@link Iterable}s, making them look like they were
 * one big iterable. All iteration/combining is done lazily.
 * 
 * @param  the type of items in the iteration.
 */
public class CombiningIterable implements Iterable
{
	private Iterable> iterables;
	
	public CombiningIterable( Iterable> iterables )
	{
		this.iterables = iterables;
	}
	
	public Iterator iterator()
	{
		LinkedList> iterators = new LinkedList>();
		for ( Iterable iterable : iterables )
		{
			iterators.add( iterable.iterator() );
		}
		return new CombiningIterator( iterators );
	}
}