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// Tags: JDK1.2
// Copyright (C) 2006 Red Hat, Inc.
// This file is part of Mauve.
// Mauve is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
// Mauve is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Mauve; see the file COPYING. If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
package gnu.testlet.java.util.Iterator;
import gnu.testlet.TestHarness;
import gnu.testlet.Testlet;
import java.util.*;
/**
* For a variety of collections classes, this test modifies the backing
* store underlying an active iterator, and check that Iterator.next()
* correctly throws ConcurrentModificationException, while hasNext(),
* hasPrevious(), previousIndex(), and nextIndex() do not.
*/
public class ConcurrentModification implements Testlet
{
TestHarness harness;
public void test(TestHarness harness)
{
this.harness = harness;
testMapIterator(new HashMap());
testMapIterator(new TreeMap());
testMapIterator(new Hashtable());
testMapIterator(new LinkedHashMap());
testMapIterator(new IdentityHashMap());
testMapIterator(new WeakHashMap());
testMapIterator(Collections.synchronizedMap(new HashMap()));
testListIterator(new ArrayList());
testListIterator(new Vector());
testListIterator(new LinkedList());
testListIterator(Collections.synchronizedList(new ArrayList()));
testCollectionIterator(new HashSet());
testCollectionIterator(new LinkedHashSet());
testCollectionIterator(new TreeSet());
}
void testMapIterator(Map map)
{
map.put("1", "value");
map.put("2", "value");
testIterator(map.keySet());
map.clear();
map.put("1", "value");
map.put("2", "value");
testIterator(map.values());
}
void testListIterator(List l)
{
l.add("1");
l.add("2");
testIterator(l);
l.clear();
l.add("1");
l.add("2");
l.add("3");
testIterator(l.subList(0, 3));
l.clear();
l.add("1");
l.add("2");
l.add("3");
testListHasPrevious(l);
}
void testCollectionIterator(Collection c)
{
c.add("1");
c.add("2");
testIterator(c);
}
void testIterator(Collection c)
{
Iterator iter = c.iterator();
String element = (String) iter.next();
c.remove(element); // Invalid concurrent modification.
boolean hasNext = false;
try
{
hasNext = iter.hasNext();
}
catch (ConcurrentModificationException x)
{
harness.fail(c.getClass() + ".iterator().hasNext() throws " + x);
return;
}
try
{
element = (String) iter.next();
}
catch (ConcurrentModificationException x)
{
harness.check(true); // OK!
}
}
void testListHasPrevious(List l)
{
ListIterator iter = l.listIterator();
String element = (String) iter.next();
l.remove(element); // Invalid concurrent modification.
int idx = -1;
boolean hasPrevious = false;
try
{
hasPrevious = iter.hasPrevious();
}
catch (ConcurrentModificationException x)
{
harness.fail(l.getClass() + ".listIterator().hasPrevious() throws " + x);
return;
}
try
{
idx = iter.nextIndex();
}
catch (ConcurrentModificationException x)
{
harness.fail(l.getClass() + ".listIterator().nextIndex() throws " + x);
return;
}
try
{
idx = iter.previousIndex();
}
catch (ConcurrentModificationException x)
{
harness.fail(l.getClass() + ".listIterator().previousIndex() throws " + x);
return;
}
try
{
element = (String) iter.next();
}
catch (ConcurrentModificationException x)
{
harness.check(true); // OK!
}
}
}
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