/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2009 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.demo.util;
import java.util.Enumeration;
import java.util.NoSuchElementException;
/**
* An enumeration that iterates over an array.
*
* @author Thomas Morgner
*/
public class ArrayEnumeration implements Enumeration
{
/**
* The base datasource.
*/
private Object[] objectarray = null;
/**
* The counter holds the current position inside the array.
*/
private int counter = 0;
/**
* Creates a new enumeration for the given array.
*
* @param objectarray the array over which to iterate
* @throws NullPointerException if the array is null.
*/
public ArrayEnumeration(Object[] objectarray)
{
if (objectarray == null)
{
throw new NullPointerException("The array must not be null.");
}
this.objectarray = objectarray;
}
/**
* Returns true if this enumeration has at least one more Element.
*
* @return true, if there are more elements, false otherwise.
*/
public boolean hasMoreElements()
{
return (counter < objectarray.length);
}
/**
* Returns the next element in the Array.
*
* @return the next element in the array.
* @throws NoSuchElementException if no more elements exist.
*/
public Object nextElement()
{
if (counter >= objectarray.length)
{
throw new NoSuchElementException();
}
Object retval = objectarray[counter];
counter += 1;
return retval;
}
}