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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package lite.beans;

/**
 * A type of {@link PropertyChangeEvent} that indicates that an indexed property
 * has changed.
 * 
 * @since 1.5
 */
public class IndexedPropertyChangeEvent extends PropertyChangeEvent {

    private static final long serialVersionUID = -320227448495806870L;

    private final int index;

    /**
     * Creates a new property changed event with an indication of the property
     * index.
     * 
     * @param source
     *            the changed bean.
     * @param propertyName
     *            the changed property, or null to indicate an
     *            unspecified set of the properties have changed.
     * @param oldValue
     *            the previous value of the property, or null if
     *            the propertyName is null or the
     *            previous value is unknown.
     * @param newValue
     *            the new value of the property, or null if the
     *            propertyName is null or the new
     *            value is unknown..
     * @param index
     *            the index of the property.
     */
    public IndexedPropertyChangeEvent(Object source, String propertyName,
            Object oldValue, Object newValue, int index) {
        super(source, propertyName, oldValue, newValue);
        this.index = index;
    }

    /**
     * Answer the index of the property that was changed in this event.
     * 
     * @return The property element index.
     */
    public int getIndex() {
        return index;
    }
}