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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) 2002-2015 "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;

/**
 * Wraps an {@link Iterable} so that it returns items of another type. The
 * iteration is done lazily.
 *
 * @param  the type of items to return
 * @param  the type of items to wrap/convert from
 */
public abstract class IterableWrapper implements Iterable
{
	private Iterable source;
	
	public IterableWrapper( Iterable iterableToWrap )
	{
		this.source = iterableToWrap;
	}
	
	protected abstract T underlyingObjectToObject( U object );
	
	public Iterator iterator()
	{
		return new MyIteratorWrapper( source.iterator() );
	}
	
	private class MyIteratorWrapper extends IteratorWrapper
	{
		public MyIteratorWrapper( Iterator iteratorToWrap )
		{
			super( iteratorToWrap );
		}

		@Override
		protected T underlyingObjectToObject( U object )
		{
			return IterableWrapper.this.underlyingObjectToObject( object );
		}
	}
}