/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ------------
* Dataset.java
* ------------
* (C) Copyright 2000-2008, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* 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.general;
/**
* 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);
}
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