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 );
}