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Add LoopingIterator 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@130868 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Stephen Colebourne 2002-11-21 23:08:27 +00:00
parent e28052ee76
commit af5dd4d71a
1 changed files with 22 additions and 4 deletions
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26
src/java/org/apache/commons/collections/IteratorUtils.java
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@ -1,7 +1,7 @@
/*
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/IteratorUtils.java,v 1.4 2002/10/12 22:15:18 scolebourne Exp $
* $Revision: 1.4 $
* $Date: 2002/10/12 22:15:18 $
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/IteratorUtils.java,v 1.5 2002/11/21 23:08:27 scolebourne Exp $
* $Revision: 1.5 $
* $Date: 2002/11/21 23:08:27 $
*
* ====================================================================
*
@ -81,6 +81,7 @@ import org.apache.commons.collections.iterators.FilterListIterator;
import org.apache.commons.collections.iterators.IteratorChain;
import org.apache.commons.collections.iterators.IteratorEnumeration;
import org.apache.commons.collections.iterators.ListIteratorWrapper;
import org.apache.commons.collections.iterators.LoopingIterator;
import org.apache.commons.collections.iterators.SingletonIterator;
import org.apache.commons.collections.iterators.SingletonListIterator;
import org.apache.commons.collections.iterators.TransformIterator;
@ -90,7 +91,7 @@ import org.apache.commons.collections.iterators.TransformIterator;
* <code>org.apache.commons.collections.iterators</code> subpackage.
*
* @author <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a>
* @version $Id: IteratorUtils.java,v 1.4 2002/10/12 22:15:18 scolebourne Exp $
* @version $Id: IteratorUtils.java,v 1.5 2002/11/21 23:08:27 scolebourne Exp $
* @since 2.1
*/
public class IteratorUtils {
@ -395,6 +396,23 @@ public class IteratorUtils {
return new FilterListIterator(listIterator, predicate);
}
/**
* Gets an iterator that loops continuously over the supplied collection.
* <p>
* The iterator will only stop looping if the remove method is called
* enough times to empty the collection, or if the collection is empty
* to start with.
*
* @param coll the collection to iterate over, not null
* @throws NullPointerException if the collection is null
*/
public static Iterator loopingIterator(Collection coll) {
if (coll == null) {
throw new NullPointerException("Collection must not be null");
}
return new LoopingIterator(coll);
}
/**
* Gets an iterator that provides an iterator view of the given enumeration.
*