001 package data;
002
003 import data.events.CatalogChangeListener;
004
005 /**
006 * A Catalog that fires events to inform about changes to its contents.
007 *
008 * @author Steffen Zschaler
009 * @version 2.0 18/08/1999
010 * @since v2.0
011 */
012 public interface ListenableCatalog extends Catalog {
013
014 /**
015 * Add a listener that will be informed about changes to the Catalog's contents.
016 *
017 * @override Always
018 *
019 * @param ccl the listener to be added.
020 */
021 public void addCatalogChangeListener(CatalogChangeListener ccl);
022
023 /**
024 * Remove a listener that was informed about changes to the Catalog's contents.
025 *
026 * @override Always
027 *
028 * @param ccl the listener to be removed.
029 */
030 public void removeCatalogChangeListener(CatalogChangeListener ccl);
031 }