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jfreechart example source code file (HighLowItemLabelGenerator.java)

This example jfreechart source code file (HighLowItemLabelGenerator.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

date, dateformat, highlowitemlabelgenerator, highlowitemlabelgenerator, illegalargumentexception, io, null, number, number, numberformat, ohlcdataset, ohlcdataset, string, string, text, util, xytooltipgenerator

The jfreechart HighLowItemLabelGenerator.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.]
 *
 * ------------------------------
 * HighLowItemLabelGenerator.java
 * ------------------------------
 * (C) Copyright 2001-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   David Basten;
 *
 * Changes
 * -------
 * 13-Dec-2001 : Version 1 (DG);
 * 16-Jan-2002 : Completed Javadocs (DG);
 * 23-Apr-2002 : Added date to the tooltip string (DG);
 * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);
 * 21-Mar-2003 : Implemented Serializable (DG);
 * 13-Aug-2003 : Implemented Cloneable (DG);
 * 17-Nov-2003 : Implemented PublicCloneable (DG);
 * 25-Feb-2004 : Renamed XYToolTipGenerator --> XYItemLabelGenerator (DG);
 * 25-May-2004 : Added number formatter (see patch 890496) (DG);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with 
 *               getYValue() (DG);
 * 20-Apr-2005 : Renamed XYLabelGenerator --> XYItemLabelGenerator (DG);
 * 31-Mar-2008 : Added hashCode() method to appease FindBugs (DG);
 *
 */

package org.jfree.chart.labels;

import java.io.Serializable;
import java.text.DateFormat;
import java.text.NumberFormat;
import java.util.Date;

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

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

    /** For serialization. */
    private static final long serialVersionUID = 5617111754832211830L;
    
    /** The date formatter. */
    private DateFormat dateFormatter;

    /** The number formatter. */
    private NumberFormat numberFormatter;

    /**
     * Creates an item label generator using the default date and number 
     * formats.
     */
    public HighLowItemLabelGenerator() {
        this(DateFormat.getInstance(), NumberFormat.getInstance());
    }

    /**
     * Creates a tool tip generator using the supplied date formatter.
     *
     * @param dateFormatter  the date formatter (<code>null not 
     *                       permitted).
     * @param numberFormatter  the number formatter (<code>null not 
     *                         permitted).
     */
    public HighLowItemLabelGenerator(DateFormat dateFormatter, 
                                     NumberFormat numberFormatter) {
        if (dateFormatter == null) {
            throw new IllegalArgumentException(
                    "Null 'dateFormatter' argument.");   
        }
        if (numberFormatter == null) {
            throw new IllegalArgumentException(
                    "Null 'numberFormatter' argument.");
        }
        this.dateFormatter = dateFormatter;
        this.numberFormatter = numberFormatter;
    }

    /**
     * Generates a tooltip text item for a particular item within a series.
     *
     * @param dataset  the dataset.
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The tooltip text.
     */
    public String generateToolTip(XYDataset dataset, int series, int item) {

        String result = null;

        if (dataset instanceof OHLCDataset) {
            OHLCDataset d = (OHLCDataset) dataset;
            Number high = d.getHigh(series, item);
            Number low = d.getLow(series, item);
            Number open = d.getOpen(series, item);
            Number close = d.getClose(series, item);
            Number x = d.getX(series, item);

            result = d.getSeriesKey(series).toString();

            if (x != null) {
                Date date = new Date(x.longValue());
                result = result + "--> Date=" + this.dateFormatter.format(date);
                if (high != null) {
                    result = result + " High=" 
                             + this.numberFormatter.format(high.doubleValue());
                }
                if (low != null) {
                    result = result + " Low=" 
                             + this.numberFormatter.format(low.doubleValue());
                }
                if (open != null) {
                    result = result + " Open=" 
                             + this.numberFormatter.format(open.doubleValue());
                }
                if (close != null) {
                    result = result + " Close=" 
                             + this.numberFormatter.format(close.doubleValue());
                }
            }

        }

        return result;

    }

    /**
     * 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
    }

    /**
     * Returns an independent copy of the generator.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException if cloning is not supported.
     */
    public Object clone() throws CloneNotSupportedException {
        
        HighLowItemLabelGenerator clone 
            = (HighLowItemLabelGenerator) super.clone();

        if (this.dateFormatter != null) {
            clone.dateFormatter = (DateFormat) this.dateFormatter.clone();
        }
        if (this.numberFormatter != null) {
            clone.numberFormatter = (NumberFormat) this.numberFormatter.clone();
        }
        
        return 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 HighLowItemLabelGenerator)) {
            return false;
        }
        HighLowItemLabelGenerator generator = (HighLowItemLabelGenerator) obj;
        if (!this.dateFormatter.equals(generator.dateFormatter)) {
            return false;
        }
        if (!this.numberFormatter.equals(generator.numberFormatter)) {
            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.dateFormatter);
        result = HashUtilities.hashCode(result, this.numberFormatter);
        return result;
    }
    
}

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