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jfreechart example source code file (CategoryItemLabelGenerator.java)

This example jfreechart source code file (CategoryItemLabelGenerator.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

categoryitemlabelgenerator, categoryitemlabelgenerator, string, string

The jfreechart CategoryItemLabelGenerator.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.]
 *
 * -------------------------------
 * CategoryItemLabelGenerator.java
 * -------------------------------
 * (C) Copyright 2001-2008, 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);
 * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);
 * 24-Oct-2002 : Method now specifies category index (DG);
 * 05-Nov-2002 : Replaced reference to CategoryDataset with TableDataset (DG);
 * 21-Jan-2003 : TableDataset merged with CategoryDataset (DG);
 * 10-Apr-2003 : Changed CategoryDataset --> KeyedValues2DDataset (DG);
 * 01-May-2003 : Added generateValueLabel() method (with a plan to renaming
 *               this interface to reflect its more general use) (DG);
 * 09-Jun-2003 : Renamed CategoryToolTipGenerator
 *               --> CategoryItemLabelGenerator (DG);
 * 13-Aug-2003 : Added clone() method (DG);
 * 12-Feb-2004 : Removed clone() method (DG);
 * 15-Apr-2004 : Moved generateToolTip() method into CategoryToolTipGenerator
 *               interface (DG);
 * 11-May-2004 : Renamed CategoryItemLabelGenerator
 *               --> CategoryLabelGenerator (DG);
 * 31-Jan-2005 : Added generateRowLabel() and generateColumnLabel()
 *               methods (DG);
 * 20-Apr-2005 : Reverted name change of 11-May-2004 (DG);
 *
 */

package org.jfree.chart.labels;

import org.jfree.data.category.CategoryDataset;

/**
 * A <i>category item label generator is an object that can be assigned to a
 * {@link org.jfree.chart.renderer.category.CategoryItemRenderer} and that
 * assumes responsibility for creating text items to be used as labels for the
 * items in a {@link org.jfree.chart.plot.CategoryPlot}.
 * <p>
 * To assist with cloning charts, classes that implement this interface should
 * also implement the {@link org.jfree.util.PublicCloneable} interface.
 */
public interface CategoryItemLabelGenerator {

    /**
     * Generates a label for the specified row.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param row  the row index (zero-based).
     *
     * @return The label.
     */
    public String generateRowLabel(CategoryDataset dataset, int row);

    /**
     * Generates a label for the specified row.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param column  the column index (zero-based).
     *
     * @return The label.
     */
    public String generateColumnLabel(CategoryDataset dataset, int column);

    /**
     * Generates a label for the specified item. The label is typically a
     * formatted version of the data value, but any text can be used.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     *
     * @return The label (possibly <code>null).
     */
    public String generateLabel(CategoryDataset dataset, int row, int column);

}

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