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 );
}
}