LoopingListIterator behaves unexpected on next and previous mixed
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Key: COLLECTIONS-246
URL: https://issues.apache.org/jira/browse/COLLECTIONS-246
Project: Commons Collections
Issue Type: Bug
Components: Iterator
Affects Versions: 3.2
Environment: JDK 1.4.2_12
Common Collections 3.2
Reporter: Frank hefter
Priority: Blocker
Using ArrayList as the backing list.
This combination at least returns unexpected results as you can see in the
testcase below.
I used this for a list navigator in a web frontend and had trouble with users.
I suspect java.util.AbstrList$ListItr (role of "cursor" var seems to be wrong
implemented ) to cause this problem. If so maybe we have to implement it in a
different way.
Testcase (it runs without hassle but the comments show whats wrong):
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import java.util.ArrayList;
import junit.framework.TestCase;
import org.apache.commons.collections.iterators.LoopingListIterator;
public class SelectionControllerTest extends TestCase {
public void testSelectorForApache() {
ArrayList al = new ArrayList();
al.add("0"); al.add("1"); al.add("2");
LoopingListIterator it = new LoopingListIterator(al);
assertEquals("0", it.next()); // This is OK
// here I am on "0"
assertEquals("0", it.previous()); // Wrong ! This should be 3!
// here I am on "0" too! This wrong.
assertEquals("2", it.previous());
assertEquals("1", it.previous());
assertEquals("0", it.previous());
assertEquals("2", it.previous());
// here I am on "2"
assertEquals("2", it.next()); // Wrong ! This should be 0!
// here I am on "2" too! This wrong.
assertEquals("0", it.next());
assertEquals("1", it.next());
// here I am on "1"
assertEquals("1", it.previous()); // Wrong ! This should be 0!
}
}
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Thanks for your help.
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