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jfreechart example source code file (StandardCategorySeriesLabelGenerator.java)

This example jfreechart source code file (StandardCategorySeriesLabelGenerator.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

categoryserieslabelgenerator, clonenotsupportedexception, default_label_format, illegalargumentexception, io, null, null, object, object, publiccloneable, serializable, standardcategoryserieslabelgenerator, standardcategoryserieslabelgenerator, string, string, text

The jfreechart StandardCategorySeriesLabelGenerator.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.]
 *
 * -----------------------------------------
 * StandardCategorySeriesLabelGenerator.java
 * -----------------------------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 20-Apr-2005 : Version 1 (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 03-May-2006 : Fixed equals() method (bug 1481102) (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.category.CategoryDataset;
import org.jfree.util.PublicCloneable;

/**
 * A standard series label generator for plots that use data from
 * a {@link org.jfree.data.category.CategoryDataset}.
 */
public class StandardCategorySeriesLabelGenerator implements
    CategorySeriesLabelGenerator, Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 4630760091523940820L;

    /** 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 StandardCategorySeriesLabelGenerator() {
        this(DEFAULT_LABEL_FORMAT);
    }

    /**
     * Creates a new series label generator.
     *
     * @param format  the format pattern (<code>null not permitted).
     */
    public StandardCategorySeriesLabelGenerator(String format) {
        if (format == null) {
            throw new IllegalArgumentException("Null 'format' argument.");
        }
        this.formatPattern = format;
    }

    /**
     * Generates a label for the specified series.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param series  the series.
     *
     * @return A series label.
     */
    public String generateLabel(CategoryDataset 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(CategoryDataset dataset, int series) {
        Object[] result = new Object[1];
        result[0] = dataset.getRowKey(series).toString();
        return result;
    }

    /**
     * Returns an independent copy of the generator.
     *
     * @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 StandardCategorySeriesLabelGenerator)) {
            return false;
        }
        StandardCategorySeriesLabelGenerator that
                = (StandardCategorySeriesLabelGenerator) 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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