Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2005, 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.] * * ---------------------------------- * StandardPieItemLabelGenerator.java * ---------------------------------- * (C) Copyright 2001-2004, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): Richard Atkinson; * Andreas Schroeder; * * $Id: StandardPieItemLabelGenerator.java,v 1.5 2005/05/19 15:43:00 mungady Exp $ * * Changes * ------- * 13-Dec-2001 : Version 1 (DG); * 16-Jan-2002 : Completed Javadocs (DG); * 29-Aug-2002 : Changed to format numbers using default locale (RA); * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG); * 30-Oct-2002 : Changed PieToolTipGenerator interface (DG); * 21-Mar-2003 : Implemented Serializable (DG); * 13-Aug-2003 : Implemented Cloneable (DG); * 19-Aug-2003 : Renamed StandardPieToolTipGenerator --> * StandardPieItemLabelGenerator (DG); * 10-Mar-2004 : Modified to use MessageFormat class (DG); * 31-Mar-2004 : Added javadocs for the MessageFormat usage (AS); * 15-Apr-2004 : Split PieItemLabelGenerator interface into * PieSectionLabelGenerator and PieToolTipGenerator (DG); * 25-Nov-2004 : Moved some code into abstract super class (DG); * */ package com.twocents.report.charts; import java.io.Serializable; import java.text.AttributedString; import java.text.MessageFormat; import java.text.NumberFormat; import org.jfree.chart.labels.AbstractPieItemLabelGenerator; import org.jfree.chart.labels.PieSectionLabelGenerator; import org.jfree.chart.labels.PieToolTipGenerator; import org.jfree.data.general.PieDataset; import org.jfree.util.PublicCloneable; /** * A standard item label generator for plots that use data from a * {@link PieDataset}. * <p> * For the label format, use {0} where the pie section key should be inserted, * {1} for the absolute section value and {2} for the percent amount of the pie * section, e.g. <code>"{0} = {1} ({2})"</code> will display as * <code>apple = 120 (5%)</code>. */ public class StandardPieItemLabelGenerator extends AbstractPieItemLabelGenerator implements PieToolTipGenerator, PieSectionLabelGenerator, Cloneable, PublicCloneable, Serializable { /** For serialization. */ private static final long serialVersionUID = 2995304200445733779L; /** The default tooltip format. */ public static final String DEFAULT_TOOLTIP_FORMAT = "{0}: ({1}, {2})"; /** The default section label format. */ public static final String DEFAULT_SECTION_LABEL_FORMAT = "{0} = {1}"; /** * Creates an item label generator using default number formatters. */ public StandardPieItemLabelGenerator() { this(DEFAULT_SECTION_LABEL_FORMAT, NumberFormat.getNumberInstance(), NumberFormat.getPercentInstance()); } /** * Creates an item label generator. * * @param labelFormat the label format. */ public StandardPieItemLabelGenerator(String labelFormat) { this(labelFormat, NumberFormat.getNumberInstance(), NumberFormat.getPercentInstance()); } /** * Creates an item label generator using the specified number formatters. * * @param labelFormat the label format string (<code>null</code> not * permitted). * @param numberFormat the format object for the values (<code>null</code> * not permitted). * @param percentFormat the format object for the percentages * (<code>null</code> not permitted). */ public StandardPieItemLabelGenerator(String labelFormat, NumberFormat numberFormat, NumberFormat percentFormat) { super(labelFormat, numberFormat, percentFormat); } /** * Generates a label for a pie section. * * @param dataset the dataset (<code>null</code> not permitted). * @param key the section key (<code>null</code> not permitted). * * @return The label (possibly <code>null</code>). */ public String generateSectionLabel(PieDataset dataset, Comparable key) { String result = null; if (dataset != null) { Object[] items = createItemArray(dataset, key); result = MessageFormat.format(getLabelFormat(), items); } return result; } /** * Generates a tool tip text item for one section in a pie chart. * * @param dataset the dataset (<code>null</code> not permitted). * @param key the section key (<code>null</code> not permitted). * * @return The tool tip text (possibly <code>null</code>). */ public String generateToolTip(PieDataset dataset, Comparable key) { return generateSectionLabel(dataset, key); } /** * Returns an independent copy of the generator. * * @return A clone. * * @throws CloneNotSupportedException should not happen. */ public Object clone() throws CloneNotSupportedException { return super.clone(); } //@Override public AttributedString generateAttributedSectionLabel(PieDataset arg0, Comparable arg1) { return null; } }