test/java/beans/VetoableChangeSupport/Test4425885.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 *
 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

/*
 * @test
 * @bug 4425885
 * @summary Tests VetoableChangeListener notification
 * @author Sergey Malenkov
 */

import java.beans.PropertyChangeEvent;
import java.beans.PropertyVetoException;
import java.beans.VetoableChangeListener;
import java.beans.VetoableChangeSupport;

public class Test4425885 {
    private static final String PROPERTY = "property"; // NON-NLS: predefined property name

    public static void main(String[] args) {
        CheckListener first = new CheckListener();
        VetoListener second = new VetoListener();
        CheckListener third = new CheckListener();

        VetoableChangeSupport vcs = new VetoableChangeSupport(Test4425885.class);
        vcs.addVetoableChangeListener(PROPERTY, first);
        vcs.addVetoableChangeListener(PROPERTY, second);
        vcs.addVetoableChangeListener(PROPERTY, third);
        try {
            vcs.fireVetoableChange(PROPERTY, 0, 1);
        } catch (PropertyVetoException exception) {
            if (first.odd)
                throw new Error("no undo for the first listener", exception);

            if (third.odd)
                throw new Error("no undo for the third listener", exception);

            return; // expected exception
        }
        throw new Error("exception should be thrown");
    }

    private static class CheckListener implements VetoableChangeListener {
        private boolean odd; // even/odd check for notification

        public void vetoableChange(PropertyChangeEvent event) throws PropertyVetoException {
            this.odd = !this.odd;
        }
    }

    private static class VetoListener implements VetoableChangeListener {
        public void vetoableChange(PropertyChangeEvent event) throws PropertyVetoException {
            throw new PropertyVetoException("disable all changes", event);
        }
    }
}