/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esper.collection;
import com.espertech.esper.client.EventBean;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* A utility class for an iterator that has one element.
*/
public class SingleEventIterator implements Iterator<EventBean>
{
private EventBean eventBean;
private boolean hasMore;
/**
* Constructor, takes the single event to iterate over as a parameter.
* The single event can be null indicating that there are no more elements.
* @param eventBean single bean that the iterator returns, or null for an empty iterator
*/
public SingleEventIterator(EventBean eventBean)
{
if (eventBean == null)
{
hasMore = false;
}
else
{
this.eventBean = eventBean;
this.hasMore = true;
}
}
public boolean hasNext()
{
return hasMore;
}
public EventBean next()
{
if (!hasMore)
{
throw new NoSuchElementException();
}
hasMore = false;
return eventBean;
}
public void remove()
{
throw new UnsupportedOperationException();
}
}