ReversedArrayEventIterator.java

/**************************************************************************************
 * 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;

/**
 * Reversed iterator for an array of events.
 */
public class ReversedArrayEventIterator implements Iterator<EventBean>
{
    private final EventBean[] events;
    private int position;

    public ReversedArrayEventIterator(EventBean[] events)
    {
        position = events.length - 1;
        this.events = events;
    }

    public boolean hasNext()
    {
        if ((events == null) || (position < 0))
        {
            return false;
        }
        return true;
    }

    public EventBean next()
    {
        if ((events == null) || (position < 0))
        {
            throw new NoSuchElementException();
        }
        return events[position--];
    }

    public void remove()
    {
        throw new UnsupportedOperationException();
    }
}