Mega Code Archive
An enumeration that iterates over an array
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/**
*
* JFreeReport : a free Java reporting library
*
*
* Project Info: http://reporting.pentaho.org/
*
* (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library 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.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* ArrayEnumeration.java
* ------------
* (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
*/
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(final 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();
}
final Object retval = objectarray[counter];
counter += 1;
return retval;
}
}
]]>