/*

 * Copyright (c) 2012, 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 7192275

 * @summary Basic test of addPropertyListener/removePropertyListener methods

 * @run main/othervm Listeners

 */

import java.util.logging.LogManager;

import java.beans.PropertyChangeListener;

import java.beans.PropertyChangeEvent;

public class Listeners {

    static void assertTrue(boolean result, String msg) {

        if (!result)

            throw new RuntimeException(msg);

    }

    /**

     * A {@code PropertyChangeListener} that counts the number of times that

     * the {@code propertyChange} method is fired, and also checks that the

     * event source is the expected (fixed) object.

     */

    static class Listener implements PropertyChangeListener {

        private final Object expectedSource;

        private int fireCount;

        Listener(Object expectedSource) {

            this.expectedSource = expectedSource;

        }

        int fireCount() {

            return fireCount;

        }

        Listener reset() {

            fireCount = 0;

            return this;

        }

        @Override

        public void propertyChange(PropertyChangeEvent evt) {

            assertTrue(evt.getSource() == expectedSource, "Unexpected source");

            fireCount++;

        }

    }

    /**

     * Tests that the given listeners are invoked the expected number of

     * times.

     */

    static void test(Listener[] listeners, int... expected) throws Exception {

        // reset counts

        for (Listener listener : listeners) {

            listener.reset();

        }

        // re-reading configuration causes events to be fired

        LogManager.getLogManager().readConfiguration();

        // check event listeners invoked as expected

        for (int i = 0; i < expected.length; i++) {

            assertTrue(listeners[i].fireCount() == expected[i],

                "Unexpected event count");

        }

    }

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

        LogManager logman = LogManager.getLogManager();

        Listener[] listeners = new Listener[2];

        Listener listener1 = listeners[0] = new Listener(LogManager.class);

        Listener listener2 = listeners[1] = new Listener(LogManager.class);

        // add listeners

        logman.addPropertyChangeListener(listener1);

        test(listeners, 1, 0);

        logman.addPropertyChangeListener(listener1);

        test(listeners, 2, 0);

        logman.addPropertyChangeListener(listener2);

        test(listeners, 2, 1);

        // null handling to check for impact on the existing registrations

        try {

            logman.addPropertyChangeListener(null);

            assertTrue(false, "NullPointerException expected");

        } catch (NullPointerException expected) { }

        test(listeners, 2, 1);

        logman.removePropertyChangeListener(null);  // no-op

        test(listeners, 2, 1);

        // remove listeners

        logman.removePropertyChangeListener(listener1);

        test(listeners, 1, 1);

        logman.removePropertyChangeListener(listener1);

        test(listeners, 0, 1);

        logman.removePropertyChangeListener(listener1);  // no-op

        test(listeners, 0, 1);

        logman.removePropertyChangeListener(listener2);

        test(listeners, 0, 0);

        logman.removePropertyChangeListener(listener2);  // no-op

        test(listeners, 0, 0);

    }

}