alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (SeqIterator.java)

This example Java source code file (SeqIterator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

nosuchelementexception, object, seqiterator, start, unsupportedoperationexception, util

The SeqIterator.java Java example source code

/**
 *   Copyright (c) Rich Hickey. All rights reserved.
 *   The use and distribution terms for this software are covered by the
 *   Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
 *   which can be found in the file epl-v10.html at the root of this distribution.
 *   By using this software in any fashion, you are agreeing to be bound by
 * 	 the terms of this license.
 *   You must not remove this notice, or any other, from this software.
 **/

/* rich Jun 19, 2007 */

package clojure.lang;

import java.util.Iterator;
import java.util.NoSuchElementException;

public class SeqIterator implements Iterator{

static final Object START = new Object();
Object seq;
Object next;

public SeqIterator(Object o){
	seq = START;
	next = o;
}

//preserved for binary compatibility
public SeqIterator(ISeq o){
	seq = START;
	next = o;
}

public boolean hasNext(){
	if(seq == START){
		seq = null;
		next = RT.seq(next);
		}
	else if(seq == next)
		next = RT.next(seq);
	return next != null;
}

public Object next() throws NoSuchElementException {
	if(!hasNext())
		throw new NoSuchElementException();
	seq = next;
	return RT.first(next);
}

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

Other Java examples (source code examples)

Here is a short list of links related to this Java SeqIterator.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.