Java tutorial
/* * =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors. * Project Info: http://www.jfree.org/jfreechart/index.html * This library is free software; you can redistribute it and/or modify it under the terms * of the GNU Lesser General Public License as published by the Free Software Foundation; * either version 2.1 of the License, or (at your option) any later version. * This library 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 Lesser General Public License for more details. * You should have received a copy of the GNU Lesser General Public License along with this * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * ------------ * Dataset.java * ------------ * (C) Copyright 2000-2004, by Object Refinery Limited. * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * $Id: Dataset.java,v 1.1 2011-01-31 09:02:12 klukas Exp $ * Changes (from 18-Sep-2001) * -------------------------- * 18-Sep-2001 : Added standard header and fixed DOS encoding problem (DG); * 15-Oct-2001 : Moved to a new package (com.jrefinery.data.*) (DG); * 22-Oct-2001 : Changed name to Dataset.java (DG); * 17-Nov-2001 : Added getLegendItemCount() and getLegendItemLabels() methods, created * SeriesDataset interface and transferred series related methods out (DG); * 22-Jan-2002 : Reconsidered (and removed) the getLegendItemCount() and getLegendItemLabels() * methods...leave this to client code (DG); * 27-Sep-2002 : Added get/setDatasetGroup(...) methods (DG); * 10-Jan-2003 : Updated Javadocs (DG); */ package org.jfree.data; /** * The base interface for data sets. * <P> * All datasets are required to support the {@link DatasetChangeEvent} mechanism by allowing listeners to register and receive notification of any changes to * the dataset. * <P> * In addition, all datasets must belong to one (and only one) {@link DatasetGroup}. The group object maintains a reader-writer lock which provides synchronised * access to the datasets in multi-threaded code. */ public interface Dataset { /** * Registers an object for notification of changes to the dataset. * * @param listener * the object to register. */ public void addChangeListener(DatasetChangeListener listener); /** * Deregisters an object for notification of changes to the dataset. * * @param listener * the object to deregister. */ public void removeChangeListener(DatasetChangeListener listener); /** * Returns the dataset group. * * @return the dataset group. */ public DatasetGroup getGroup(); /** * Sets the dataset group. * * @param group * the dataset group. */ public void setGroup(DatasetGroup group); }