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jfreechart example source code file (StandardXYSeriesLabelGenerator.java)

This example jfreechart source code file (StandardXYSeriesLabelGenerator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

clonenotsupportedexception, default_label_format, illegalargumentexception, io, null, null, object, object, publiccloneable, serializable, standardxyserieslabelgenerator, standardxyserieslabelgenerator, string, string, text, xyserieslabelgenerator

The jfreechart StandardXYSeriesLabelGenerator.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.]
 *
 * -----------------------------------
 * StandardXYSeriesLabelGenerator.java
 * -----------------------------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 16-Nov-2004 : Version 1 (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 24-Nov-2006 : Fixed equals() method and updated API docs (DG);
 * 31-Mar-2008 : Added hashCode() method to appease FindBugs (DG);
 *
 */

package org.jfree.chart.labels;

import java.io.Serializable;
import java.text.MessageFormat;

import org.jfree.chart.HashUtilities;
import org.jfree.data.xy.XYDataset;
import org.jfree.util.PublicCloneable;

/**
 * A standard series label generator for plots that use data from
 * an {@link org.jfree.data.xy.XYDataset}.
 * <br>
* This class implements <code>PublicCloneable by mistake but we retain * this for the sake of backward compatibility. */ public class StandardXYSeriesLabelGenerator implements XYSeriesLabelGenerator, Cloneable, PublicCloneable, Serializable { /** For serialization. */ private static final long serialVersionUID = 1916017081848400024L; /** The default item label format. */ public static final String DEFAULT_LABEL_FORMAT = "{0}"; /** The format pattern. */ private String formatPattern; /** * Creates a default series label generator (uses * {@link #DEFAULT_LABEL_FORMAT}). */ public StandardXYSeriesLabelGenerator() { this(DEFAULT_LABEL_FORMAT); } /** * Creates a new series label generator. * * @param format the format pattern (<code>null not permitted). */ public StandardXYSeriesLabelGenerator(String format) { if (format == null) { throw new IllegalArgumentException("Null 'format' argument."); } this.formatPattern = format; } /** * Generates a label for the specified series. This label will be * used for the chart legend. * * @param dataset the dataset (<code>null not permitted). * @param series the series. * * @return A series label. */ public String generateLabel(XYDataset dataset, int series) { if (dataset == null) { throw new IllegalArgumentException("Null 'dataset' argument."); } String label = MessageFormat.format( this.formatPattern, createItemArray(dataset, series) ); return label; } /** * Creates the array of items that can be passed to the * {@link MessageFormat} class for creating labels. * * @param dataset the dataset (<code>null not permitted). * @param series the series (zero-based index). * * @return The items (never <code>null). */ protected Object[] createItemArray(XYDataset dataset, int series) { Object[] result = new Object[1]; result[0] = dataset.getSeriesKey(series).toString(); return result; } /** * Returns an independent copy of the generator. This is unnecessary, * because instances are immutable anyway, but we retain this * behaviour for backwards compatibility. * * @return A clone. * * @throws CloneNotSupportedException if cloning is not supported. */ public Object clone() throws CloneNotSupportedException { return super.clone(); } /** * Tests this object for equality with an arbitrary object. * * @param obj the other object (<code>null permitted). * * @return A boolean. */ public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof StandardXYSeriesLabelGenerator)) { return false; } StandardXYSeriesLabelGenerator that = (StandardXYSeriesLabelGenerator) obj; if (!this.formatPattern.equals(that.formatPattern)) { return false; } return true; } /** * Returns a hash code for this instance. * * @return A hash code. */ public int hashCode() { int result = 127; result = HashUtilities.hashCode(result, this.formatPattern); return result; } }

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