Source for org.jfree.chart.plot.PlotUtilities

   1: /* ===========================================================
   2:  * JFreeChart : a free chart library for the Java(tm) platform
   3:  * ===========================================================
   4:  *
   5:  * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
   6:  *
   7:  * Project Info:  http://www.jfree.org/jfreechart/index.html
   8:  *
   9:  * This library is free software; you can redistribute it and/or modify it 
  10:  * under the terms of the GNU Lesser General Public License as published by 
  11:  * the Free Software Foundation; either version 2.1 of the License, or 
  12:  * (at your option) any later version.
  13:  *
  14:  * This library is distributed in the hope that it will be useful, but 
  15:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
  16:  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
  17:  * License for more details.
  18:  *
  19:  * You should have received a copy of the GNU Lesser General Public
  20:  * License along with this library; if not, write to the Free Software
  21:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
  22:  * USA.  
  23:  *
  24:  * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
  25:  * in the United States and other countries.]
  26:  *
  27:  * ------------------
  28:  * PlotUtilities.java
  29:  * ------------------
  30:  * (C) Copyright 2007, by Sergei Ivanov and Contributors.
  31:  *
  32:  * Original Author:  Sergei Ivanov;
  33:  * Contributor(s):   David Gilbert (for Object Refinery Limited);
  34:  *
  35:  * Changes
  36:  * -------
  37:  * 26-Sep-2007 : Version 1, contributed by Sergei Ivanov (see patch 
  38:  *               1772932) (DG);
  39:  *
  40:  */
  41: 
  42: package org.jfree.chart.plot;
  43: 
  44: import org.jfree.data.general.DatasetUtilities;
  45: import org.jfree.data.xy.XYDataset;
  46: 
  47: /**
  48:  * Some utility methods related to the plot classes.
  49:  * 
  50:  * @since 1.0.7
  51:  */
  52: public class PlotUtilities {
  53:     
  54:     /**
  55:      * Returns <code>true</code> if all the datasets belonging to the specified
  56:      * plot are empty or <code>null</code>, and <code>false</code> otherwise.
  57:      *
  58:      * @param plot  the plot (<code>null</code> permitted).
  59:      *
  60:      * @return A boolean.
  61:      * 
  62:      * @since 1.0.7
  63:      */
  64:     public static boolean isEmptyOrNull(XYPlot plot) {
  65:         if (plot != null) {
  66:             for (int i = 0, n = plot.getDatasetCount(); i < n; i++) {
  67:                 final XYDataset dataset = plot.getDataset(i);
  68:                 if (!DatasetUtilities.isEmptyOrNull(dataset)) {
  69:                     return false;
  70:                 }
  71:             }
  72:         }
  73:         return true;
  74:     }
  75:         
  76: }