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//******************************************************************************
//
// File: IteratorItemGenerator.java
// Package: edu.rit.pj
// Unit: Class edu.rit.pj.IteratorItemGenerator
//
// This Java source file is copyright (C) 2007 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
// software; you can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// PJ 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 General Public License for more details.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.pj;
import java.util.Iterator;
/**
* Class IteratorItemGenerator provides an object that generates items for a
* {@linkplain ParallelIteration}; the items come from an iterator.
*
* @param <T> Data type of the items iterated over.
*
* @author Alan Kaminsky
* @version 04-Jun-2007
*/
class IteratorItemGenerator<T>
extends ItemGenerator<T>
{
// Hidden data members.
// Iterator over the items.
private Iterator<T> myIterator;
// Exported constructors.
/**
* Construct a new iterator item generator.
*
* @param theIterator Iterator over the items.
*/
public IteratorItemGenerator
(Iterator<T> theIterator)
{
super();
myIterator = theIterator;
}
// Exported operations.
/**
* Return an item holder containing the next item to be processed plus
* associated information.
*
* @return Item holder, or null if no more items.
*/
public synchronized ItemHolder<T> nextItem()
{
ItemHolder<T> itemholder = null;
if (myIterator.hasNext() && ! myBreak)
{
itemholder = new ItemHolder<T>();
itemholder.myItem = myIterator.next();
itemholder.mySequenceNumber = myCurrentSequenceNumber;
++ myCurrentSequenceNumber;
}
return itemholder;
}
}
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