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Added extra null validation 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@130784 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Stephen Colebourne 2002-08-17 11:33:09 +00:00
parent cb996e1b98
commit ed1a9d333d
1 changed files with 26 additions and 25 deletions
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51
src/java/org/apache/commons/collections/iterators/ListIteratorWrapper.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/iterators/ListIteratorWrapper.java,v 1.1 2002/08/15 23:13:51 pjack Exp $ * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/ListIteratorWrapper.java,v 1.2 2002/08/17 11:33:09 scolebourne Exp $
* $Revision: 1.1 $ * $Revision: 1.2 $
* $Date: 2002/08/15 23:13:51 $ * $Date: 2002/08/17 11:33:09 $
* *
* ==================================================================== * ====================================================================
* *
@ -64,28 +64,45 @@ import java.util.Iterator;
import java.util.LinkedList; import java.util.LinkedList;
import java.util.ListIterator; import java.util.ListIterator;
import java.util.NoSuchElementException; import java.util.NoSuchElementException;
/** /**
* As the wrapped Iterator is traversed, ListIteratorWrapper * As the wrapped Iterator is traversed, ListIteratorWrapper
* builds a LinkedList of its values, permitting all required * builds a LinkedList of its values, permitting all required
* operations of ListIterator. * operations of ListIterator.
* *
* @author Morgan Delagrange
* @version $Revision: 1.1 $ $Date: 2002/08/15 23:13:51 $
* @since 2.1 * @since 2.1
* @author Morgan Delagrange
* @author <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a>
* @version $Id: ListIteratorWrapper.java,v 1.2 2002/08/17 11:33:09 scolebourne Exp $
*/ */
public class ListIteratorWrapper implements ListIterator { public class ListIteratorWrapper implements ListIterator {
/** Holds value of property "iterator" */
private final Iterator iterator;
private final LinkedList list = new LinkedList();
// position of this iterator
private int currentIndex = 0;
// position of the wrapped iterator
// this Iterator should only be used to populate the list
private int wrappedIteratorIndex = 0;
private static final String UNSUPPORTED_OPERATION_MESSAGE =
"ListIteratorWrapper does not support optional operations of ListIterator.";
// Constructor // Constructor
//------------------------------------------------------------------------- //-------------------------------------------------------------------------
/** /**
* Constructs a new <Code>ListIteratorWrapper</Code> that will wrap * Constructs a new <Code>ListIteratorWrapper</Code> that will wrap
* the given iterator. * the given iterator.
* *
* @param iterator the iterator to wrap * @param iterator the iterator to wrap
* @throws NullPointerException if the iterator is null
*/ */
public ListIteratorWrapper(Iterator iterator) { public ListIteratorWrapper(Iterator iterator) {
if (iterator == null) {
throw new NullPointerException("Iterator must not be null");
}
this.iterator = iterator; this.iterator = iterator;
} }
@ -200,21 +217,5 @@ public class ListIteratorWrapper implements ListIterator {
throw new UnsupportedOperationException(UNSUPPORTED_OPERATION_MESSAGE); throw new UnsupportedOperationException(UNSUPPORTED_OPERATION_MESSAGE);
} }
// Attributes
//-------------------------------------------------------------------------
/** Holds value of property "iterator". */
private Iterator iterator = null;
private LinkedList list = new LinkedList();
// position of this iterator
private int currentIndex = 0;
// position of the wrapped iterator
// this Iterator should only be used to populate the list
private int wrappedIteratorIndex = 0;
private static final String UNSUPPORTED_OPERATION_MESSAGE =
"ListIteratorWrapper does not support optional operations of ListIterator.";
} }