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jfreechart example source code file (SymbolicXYItemLabelGenerator.java)

This example jfreechart source code file (SymbolicXYItemLabelGenerator.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, io, publiccloneable, serializable, string, string, symbolicxyitemlabelgenerator, timeseriescollection, timeseriescollection, xissymbolic, xissymbolic, xytooltipgenerator, y, yissymbolic, yissymbolic

The jfreechart SymbolicXYItemLabelGenerator.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.]
 *
 * ---------------------------------
 * SymbolicXYItemLabelGenerator.java
 * ---------------------------------
 * (C) Copyright 2001-2008, by Anthony Boulestreau and Contributors.
 *
 * Original Author:  Anthony Boulestreau;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 29-Mar-2002 : Version 1, contributed by Anthony Boulestreau (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 (DG);
 * 19-Jan-2005 : Now accesses primitives only from dataset (DG);
 * 20-Apr-2005 : Renamed XYLabelGenerator --> XYItemLabelGenerator (DG);
 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
 * 31-Mar-2008 : Added hashCode() method to appease FindBugs (DG);
 *
 */

package org.jfree.chart.labels;

import java.io.Serializable;

import org.jfree.data.time.RegularTimePeriod;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XisSymbolic;
import org.jfree.data.xy.YisSymbolic;
import org.jfree.util.PublicCloneable;

/**
 * A standard item label generator for plots that use data from an
 * {@link XYDataset}.
 */
public class SymbolicXYItemLabelGenerator implements XYItemLabelGenerator,
        XYToolTipGenerator, Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 3963400354475494395L;

    /**
     * Generates a tool tip text item for a particular item within a series.
     *
     * @param data  the dataset.
     * @param series  the series number (zero-based index).
     * @param item  the item number (zero-based index).
     *
     * @return The tool tip text (possibly <code>null).
     */
    public String generateToolTip(XYDataset data, int series, int item) {

        String xStr, yStr;
        if (data instanceof YisSymbolic) {
            yStr = ((YisSymbolic) data).getYSymbolicValue(series, item);
        }
        else {
            double y = data.getYValue(series, item);
            yStr = Double.toString(round(y, 2));
        }
        if (data instanceof XisSymbolic) {
            xStr = ((XisSymbolic) data).getXSymbolicValue(series, item);
        }
        else if (data instanceof TimeSeriesCollection) {
            RegularTimePeriod p
                = ((TimeSeriesCollection) data).getSeries(series)
                    .getTimePeriod(item);
            xStr = p.toString();
        }
        else {
            double x = data.getXValue(series, item);
            xStr = Double.toString(round(x, 2));
        }
        return "X: " + xStr + ", Y: " + yStr;
    }

    /**
     * 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 series  the series index (zero-based).
     * @param category  the category index (zero-based).
     *
     * @return The label (possibly <code>null).
     */
    public String generateLabel(XYDataset dataset, int series, int category) {
        return null;  //TODO: implement this method properly
    }

    /**
    * Round a double value.
    *
    * @param value  the value.
    * @param nb  the exponent.
    *
    * @return The rounded value.
    */
    private static double round(double value, int nb) {
        if (nb <= 0) {
            return Math.floor(value + 0.5d);
        }
        double p = Math.pow(10, nb);
        double tempval = Math.floor(value * p + 0.5d);
        return tempval / p;
    }

    /**
     * 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 if this object is equal to another.
     *
     * @param obj  the other object.
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof SymbolicXYItemLabelGenerator) {
            return true;
        }
        return false;
    }

    /**
     * Returns a hash code for this instance.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 127;
        return result;
    }

}

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