/**
* Copyright (c) 2002-2010 "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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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 <T> the type of items in the iteration.
*/
public class CombiningIterable<T> implements Iterable<T>
{
private Iterable<Iterable<T>> iterables;
public CombiningIterable( Iterable<Iterable<T>> iterables )
{
this.iterables = iterables;
}
public Iterator<T> iterator()
{
LinkedList<Iterator<T>> iterators = new LinkedList<Iterator<T>>();
for ( Iterable<T> iterable : iterables )
{
iterators.add( iterable.iterator() );
}
return new CombiningIterator<T>( iterators );
}
}