categorydataset.java

用于制作报表的中间件控件,纯java编写,还附带有数据库操作的源代码

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2007, 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.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * --------------------
 * CategoryDataset.java
 * --------------------
 * (C) Copyright 2000-2007, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes (from 21-Aug-2001)
 * --------------------------
 * 21-Aug-2001 : Added standard header. Fixed DOS encoding problem (DG);
 * 18-Sep-2001 : Updated e-mail address in header (DG);
 * 15-Oct-2001 : Moved to new package (com.jrefinery.data.*) (DG);
 * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
 * 17-Nov-2001 : Updated Javadoc comments (DG);
 * 04-Mar-2002 : Updated import statement (DG);
 * 23-Oct-2002 : Reorganised code (DG);
 * 10-Jan-2003 : Updated Javadocs (DG);
 * 21-Jan-2003 : Merged with TableDataset (which only existed in CVS) (DG);
 * 13-Mar-2003 : Added KeyedValues2DDataset interface (DG);
 * 23-Apr-2003 : Switched CategoryDataset and KeyedValues2DDataset so that 
 *               CategoryDataset is the super interface (DG);
 * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.category (DG);
 *
 */

package org.jfree.data.category;

import org.jfree.data.KeyedValues2D;
import org.jfree.data.general.Dataset;

/**
 * The interface for a dataset with one or more series, and values associated 
 * with categories.
 * <P>
 * The categories are represented by <code>Comparable</code> instance, with the
 * category label being provided by the <code>toString</code> method.
 */
public interface CategoryDataset extends KeyedValues2D, Dataset {

    // no additional methods required

}