Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2013, 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.] * * --------------------------------- * StandardXYItemLabelGenerator.java * --------------------------------- * (C) Copyright 2001-2009, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * Changes * ------- * 13-Dec-2001 : Version 1 (DG); * 16-Jan-2002 : Completed Javadocs (DG); * 02-Apr-2002 : Modified to handle null y-values (DG); * 09-Apr-2002 : Added formatting objects for the x and y values (DG); * 30-May-2002 : Added series name to standard tool tip (DG); * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG); * 23-Mar-2003 : Implemented Serializable (DG); * 13-Aug-2003 : Implemented Cloneable (DG); * 17-Nov-2003 : Implemented PublicCloneable (DG); * 25-Feb-2004 : Renamed XYToolTipGenerator --> XYItemLabelGenerator and * StandardXYToolTipGenerator --> * StandardXYItemLabelGenerator (DG); * 26-Feb-2004 : Modified to use MessageFormat (DG); * 27-Feb-2004 : Added abstract superclass (DG); * 11-May-2004 : Split into StandardXYToolTipGenerator and * StandardXYLabelGenerator (DG); * 20-Apr-2005 : Renamed StandardXYLabelGenerator * --> StandardXYItemLabelGenerator (DG); * ------------- JFREECHART 1.0.x --------------------------------------------- * 25-Jan-2007 : Added new constructor - see bug 1624067 (DG); * 24-Jun-2009 : Added new constructor (DG); * */ package org.jfree.chart.labels; import java.io.Serializable; import java.text.DateFormat; import java.text.NumberFormat; import org.jfree.data.xy.XYDataset; import org.jfree.util.PublicCloneable; /** * A standard item label generator for plots that use data from an * {@link org.jfree.data.xy.XYDataset}. */ public class StandardXYItemLabelGenerator extends AbstractXYItemLabelGenerator implements XYItemLabelGenerator, Cloneable, PublicCloneable, Serializable { /** For serialization. */ private static final long serialVersionUID = 7807668053171837925L; /** The default item label format. */ public static final String DEFAULT_ITEM_LABEL_FORMAT = "{2}"; /** * Creates an item label generator using default number formatters. */ public StandardXYItemLabelGenerator() { this(DEFAULT_ITEM_LABEL_FORMAT, NumberFormat.getNumberInstance(), NumberFormat.getNumberInstance()); } /** * Creates an item label generator using the specified number formatters. * * @param formatString the item label format string (<code>null</code> not * permitted). * * @since 1.0.14 */ public StandardXYItemLabelGenerator(String formatString) { this(formatString, NumberFormat.getNumberInstance(), NumberFormat.getNumberInstance()); } /** * Creates an item label generator using the specified number formatters. * * @param formatString the item label format string (<code>null</code> not * permitted). * @param xFormat the format object for the x values (<code>null</code> * not permitted). * @param yFormat the format object for the y values (<code>null</code> * not permitted). */ public StandardXYItemLabelGenerator(String formatString, NumberFormat xFormat, NumberFormat yFormat) { super(formatString, xFormat, yFormat); } /** * Creates an item label generator using the specified formatters. * * @param formatString the item label format string (<code>null</code> * not permitted). * @param xFormat the format object for the x values (<code>null</code> * not permitted). * @param yFormat the format object for the y values (<code>null</code> * not permitted). */ public StandardXYItemLabelGenerator(String formatString, DateFormat xFormat, NumberFormat yFormat) { super(formatString, xFormat, yFormat); } /** * Creates an item label generator using the specified formatters (a * number formatter for the x-values and a date formatter for the * y-values). * * @param formatString the item label format string (<code>null</code> * not permitted). * @param xFormat the format object for the x values (<code>null</code> * permitted). * @param yFormat the format object for the y values (<code>null</code> * not permitted). * * @since 1.0.4 */ public StandardXYItemLabelGenerator(String formatString, NumberFormat xFormat, DateFormat yFormat) { super(formatString, xFormat, yFormat); } /** * Creates a label generator using the specified date formatters. * * @param formatString the label format string (<code>null</code> not * permitted). * @param xFormat the format object for the x values (<code>null</code> * not permitted). * @param yFormat the format object for the y values (<code>null</code> * not permitted). */ public StandardXYItemLabelGenerator(String formatString, DateFormat xFormat, DateFormat yFormat) { super(formatString, xFormat, yFormat); } /** * Generates the item label text for an item in a dataset. * * @param dataset the dataset (<code>null</code> not permitted). * @param series the series index (zero-based). * @param item the item index (zero-based). * * @return The label text (possibly <code>null</code>). */ @Override public String generateLabel(XYDataset dataset, int series, int item) { return generateLabelString(dataset, series, item); } /** * Returns an independent copy of the generator. * * @return A clone. * * @throws CloneNotSupportedException if cloning is not supported. */ @Override public Object clone() throws CloneNotSupportedException { return super.clone(); } /** * Tests this object for equality with an arbitrary object. * * @param obj the other object (<code>null</code> permitted). * * @return A boolean. */ @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof StandardXYItemLabelGenerator)) { return false; } return super.equals(obj); } }