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

Null values may be provided for the old and the new values if their
true values are not known.

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.
Author:
Mark Davidson
Since:
1.5/**
 * 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 IndexedPropertyChangeEvent object.
Params:
source –  The bean that fired the event.
propertyName –  The programmatic name of the property that
            was changed.
oldValue –      The old value of the property.
newValue –      The new value of the property.
index – index of the property element that was changed./**
     * 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.
Returns:
The index specifying the property element that was
        changed./**
     * 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());
    }
}