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package org.litesoft.core.util;
import java.util.*;
// Copyright Status:
//
// All Software available from LiteSoft.org (including this file) is
// hereby released into the public domain.
//
// It is free! As in, you may use it freely in both commercial and
// non-commercial applications, bundle it with your software
// distribution, include it on a CD-ROM, list the source code in a book,
// mirror the documentation at your own web site, or use it in any other
// way you see fit.
//
// NO Warranty!
//
// All software is provided "as is".
//
// There is ABSOLUTELY NO WARRANTY OF ANY KIND: not for the design, fitness
// (for a particular purpose), level of errors (or lack thereof), or
// applicability of this software. The entire risk as to the quality
// and performance of this software is with you. Should this software
// prove defective, you assume the cost of all necessary servicing, repair
// or correction.
//
// In no event unless required by applicable law or agreed to in writing
// will any party who created or may modify and/or redistribute this
// software, be liable to you for damages, including any general,
// special, incidental or consequential damages arising out of the use or
// inability to use this software (including but not limited to loss of
// data or data being rendered inaccurate or losses sustained by you or
// third parties or a failure of this software to operate with any
// other programs), even if such holder or other party has been advised
// of the possibility of such damages.
//
// NOTE: Should you discover a bug, have a recogmendation for a change, wish
// to submit modifications, or wish to add new classes/functionality,
// please email them to:
//
// changes@litesoft.org
//
/**
* An Iterator that implements the Null Object pattern.<p>
* <p/>
* This class is not directly instantiable as it is implemented with the
* singleton pattern.<p>
* <p/>
* This class <i>fully</i> implements the java.util.Iterator interface, but
* always indicates that there are no more elements.<p>
*
* @author George Smith
* @version 1.0 7/28/01
*/
public final class NullIterator<T> extends AbstractReadOnlyIterator<T>
{
/**
* Get the single instance of the Iterator.<p>
*
* @return the NullIterator instance.
*/
@SuppressWarnings({"unchecked"})
public static <V> Iterator<V> getInstance()
{
return (Iterator<V>) INSTANCE;
}
private static final Iterator INSTANCE = new NullIterator();
private NullIterator()
{
}
/**
* Returns <tt>false</tt>, because there is <b>never</b> another element.<p>
* <p/>
* Note: <tt>next</tt> will throw an exception.<p>
*
* @return <tt>false</tt>.<p>
*
* @see <a href="http://java.sun.com/j2se/1.3/docs/api/java/lang/Util/Iterator.html#hasNext()">java.util.Iterator#hasNext()</a>
* @see AbstractReadOnlyIterator#next()
*/
public boolean hasNext()
{
return false;
}
/**
* Returns a debug/human friendly String that represents this.<p>
*
* @return A String representation of this.
*/
public String toString()
{
return "NullIterator";
}
}
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Revision |
Author |
Commited |
Message |
2
|
GeorgeS
|
Sun 07 Feb, 2010 12:50:58 +0000 |
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