/*

 * Copyright (c) 2007, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 6529795

 * @summary next() does not change iterator state if throws NoSuchElementException

 * @author Martin Buchholz

 */

@SuppressWarnings("unchecked")

public class IteratorAtEnd {

    private static final int SIZE = 6;

    static void realMain(String[] args) throws Throwable {

        testCollection(new ArrayList());

        testCollection(new Vector());

        testCollection(new LinkedList());

        testCollection(new ArrayDeque());

        testCollection(new TreeSet());

        testCollection(new CopyOnWriteArrayList());

        testCollection(new CopyOnWriteArraySet());

        testCollection(new ConcurrentSkipListSet());

        testCollection(new PriorityQueue());

        testCollection(new LinkedBlockingQueue());

        testCollection(new ArrayBlockingQueue(100));

        testCollection(new ConcurrentLinkedDeque());

        testCollection(new ConcurrentLinkedQueue());

        testCollection(new LinkedTransferQueue());

        testMap(new HashMap());

        testMap(new Hashtable());

        testMap(new LinkedHashMap());

        testMap(new WeakHashMap());

        testMap(new IdentityHashMap());

        testMap(new ConcurrentHashMap());

        testMap(new ConcurrentSkipListMap());

        testMap(new TreeMap());

    }

    static void testCollection(Collection c) {

        try {

            for (int i = 0; i < SIZE; i++)

                c.add(i);

            test(c);

        } catch (Throwable t) { unexpected(t); }

    }

    static void testMap(Map m) {

        try {

            for (int i = 0; i < 3*SIZE; i++)

                m.put(i, i);

            test(m.values());

            test(m.keySet());

            test(m.entrySet());

        } catch (Throwable t) { unexpected(t); }

    }

    static void test(Collection c) {

        try {

            final Iterator it = c.iterator();

            THROWS(NoSuchElementException.class,

                   () -> { while (true) it.next(); });

            try { it.remove(); }

            catch (UnsupportedOperationException exc) { return; }

            pass();

        } catch (Throwable t) { unexpected(t); }

        if (c instanceof List) {

            final List list = (List) c;

            try {

                final ListIterator it = list.listIterator(0);

                it.next();

                final Object x = it.previous();

                THROWS(NoSuchElementException.class, () -> it.previous());

                try { it.remove(); }

                catch (UnsupportedOperationException exc) { return; }

                pass();

                check(! list.get(0).equals(x));

            } catch (Throwable t) { unexpected(t); }

            try {

                final ListIterator it = list.listIterator(list.size());

                it.previous();

                final Object x = it.next();

                THROWS(NoSuchElementException.class, () -> it.next());

                try { it.remove(); }

                catch (UnsupportedOperationException exc) { return; }

                pass();

                check(! list.get(list.size()-1).equals(x));

            } catch (Throwable t) { unexpected(t); }

        }

    }

    //--------------------- Infrastructure ---------------------------

    static volatile int passed = 0, failed = 0;

    static void pass() {passed++;}

    static void fail() {failed++; Thread.dumpStack();}

    static void fail(String msg) {System.out.println(msg); fail();}

    static void unexpected(Throwable t) {failed++; t.printStackTrace();}

    static void check(boolean cond) {if (cond) pass(); else fail();}

    static void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

    public static void main(String[] args) throws Throwable {

        try {realMain(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

    interface Fun {void f() throws Throwable;}

    static void THROWS(Class<? extends Throwable> k, Fun... fs) {

        for (Fun f : fs)

            try { f.f(); fail("Expected " + k.getName() + " not thrown"); }

            catch (Throwable t) {

                if (k.isAssignableFrom(t.getClass())) pass();

                else unexpected(t);}}

}