/**
* 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 <http://www.gnu.org/licenses/>.
*/
package org.neo4j.helpers.collection;
import java.util.Iterator;
/**
* Wraps an {@link Iterator} so that it returns items of another type. The
* iteration is done lazily.
*
* @param <T> the type of items to return
* @param <U> the type of items to wrap/convert from
*/
public abstract class IteratorWrapper<T, U> implements Iterator<T>
{
private Iterator<U> source;
public IteratorWrapper( Iterator<U> iteratorToWrap )
{
this.source = iteratorToWrap;
}
public boolean hasNext()
{
return this.source.hasNext();
}
public T next()
{
return underlyingObjectToObject( this.source.next() );
}
public void remove()
{
this.source.remove();
}
protected abstract T underlyingObjectToObject( U object );
}