/*

 * 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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

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 */

package java.beans;

/**

 * An "IndexedPropertyChange" event gets delivered whenever a component that

 * conforms to the JavaBeans™ specification (a "bean") changes a bound

 * indexed property. This class is an extension of <code>PropertyChangeEvent</code>

 * but contains the index of the property that has changed.

 * <P>

 * Null values may be provided for the old and the new values if their

 * true values are not known.

 * <P>

 * An event source may send a null object as the name to indicate that an

 * arbitrary set of if its properties have changed.  In this case the

 * old and new values should also be null.

 *

 * @since 1.5

 * @author Mark Davidson

 */

public class IndexedPropertyChangeEvent extends PropertyChangeEvent {

    private static final long serialVersionUID = -320227448495806870L;

    private int index;

    /**

     * Constructs a new <code>IndexedPropertyChangeEvent</code> object.

     *

     * @param source  The bean that fired the event.

     * @param propertyName  The programmatic name of the property that

     *             was changed.

     * @param oldValue      The old value of the property.

     * @param newValue      The new value of the property.

     * @param index index of the property element that was changed.

     */

    public IndexedPropertyChangeEvent(Object source, String propertyName,

                                      Object oldValue, Object newValue,

                                      int index) {

        super (source, propertyName, oldValue, newValue);

        this.index = index;

    }

    /**

     * Gets the index of the property that was changed.

     *

     * @return The index specifying the property element that was

     *         changed.

     */

    public int getIndex() {

        return index;

    }

    void appendTo(StringBuilder sb) {

        sb.append("; index=").append(getIndex());

    }

}