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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: }