defaultboxandwhiskerxydataset.java

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * ----------------------------------
 * DefaultBoxAndWhiskerXYDataset.java
 * ----------------------------------
 * (C) Copyright 2003-2005, by David Browning and Contributors.
 *
 * Original Author:  David Browning (for Australian Institute of Marine 
 *                   Science);
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: DefaultBoxAndWhiskerXYDataset.java,v 1.10 2005/05/20 08:58:08 mungady Exp $
 *
 * Changes
 * -------
 * 05-Aug-2003 : Version 1, contributed by David Browning (DG);
 * 08-Aug-2003 : Minor changes to comments (DB)
 *               Allow average to be null  - average is a perculiar AIMS 
 *               requirement which probably should be stripped out and overlaid
 *               if required...
 *               Added a number of methods to allow the max and min non-outlier
 *               and non-farout values to be calculated
 * 12-Aug-2003   Changed the getYValue to return the highest outlier value
 *               Added getters and setters for outlier and farout coefficients
 * 27-Aug-2003 : Renamed DefaultBoxAndWhiskerDataset 
 *               --> DefaultBoxAndWhiskerXYDataset (DG);
 * 06-May-2004 : Now extends AbstractXYDataset (DG);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with 
 *               getYValue() (DG);
 * 18-Nov-2004 : Updated for changes in RangeInfo interface (DG);
 * 11-Jan-2005 : Removed deprecated code in preparation for the 1.0.0 
 *               release (DG);
 *
 */

package org.jfree.data.statistics;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.jfree.data.Range;
import org.jfree.data.RangeInfo;
import org.jfree.data.xy.AbstractXYDataset;

/**
 * A simple implementation of the {@link BoxAndWhiskerXYDataset}.  The dataset
 * can hold only one series.
 *
 * @author David Browning
 */
public class DefaultBoxAndWhiskerXYDataset extends AbstractXYDataset 
                                           implements BoxAndWhiskerXYDataset,
                                                      RangeInfo {

    /** The series key. */
    private Comparable seriesKey;

    /** Storage for the dates. */
    private List dates;

    /** Storage for the box and whisker statistics. */
    private List items;

    /** The minimum range value. */
    private Number minimumRangeValue;

    /** The maximum range value. */
    private Number maximumRangeValue;

    /** The range of values. */
    private Range rangeBounds;

    /** 
     * The coefficient used to calculate outliers. Tukey's default value is 
     * 1.5 (see EDA) Any value which is greater than Q3 + (interquartile range 
     * * outlier coefficient) is considered to be an outlier.  Can be altered 
     * if the data is particularly skewed.
     */
    private double outlierCoefficient = 1.5;

    /** 
     * The coefficient used to calculate farouts. Tukey's default value is 2 
     * (see EDA) Any value which is greater than Q3 + (interquartile range * 
     * farout coefficient) is considered to be a farout.  Can be altered if the 
     * data is particularly skewed.
     */
    private double faroutCoefficient = 2.0;

    /**
     * Constructs a new box and whisker dataset.
     * <p>
     * The current implementation allows only one series in the dataset.
     * This may be extended in a future version.
     *
     * @param seriesKey  the key for the series.
     */
    public DefaultBoxAndWhiskerXYDataset(Comparable seriesKey) {
        this.seriesKey = seriesKey;
        this.dates = new ArrayList();
        this.items = new ArrayList();
        this.minimumRangeValue = null;
        this.maximumRangeValue = null;
        this.rangeBounds = null; 
    }

    /**
     * Adds an item to the dataset.
     * 
     * @param date  the date.
     * @param item  the item.
     */
    public void add(Date date, BoxAndWhiskerItem item) {
        this.dates.add(date);
        this.items.add(item);
        if (this.minimumRangeValue == null) {
            this.minimumRangeValue = item.getMinRegularValue();
        }
        else {
            if (item.getMinRegularValue().doubleValue() 
                    < this.minimumRangeValue.doubleValue()) {
                this.minimumRangeValue = item.getMinRegularValue();
            }
        }
        if (this.maximumRangeValue == null) {
            this.maximumRangeValue = item.getMaxRegularValue();
        }
        else {
            if (item.getMaxRegularValue().doubleValue() 
                    > this.maximumRangeValue.doubleValue()) {
                this.maximumRangeValue = item.getMaxRegularValue();
            }
        }
        this.rangeBounds = new Range(
            this.minimumRangeValue.doubleValue(), 
            this.maximumRangeValue.doubleValue()
        );
    }
    
    /**
     * Returns the name of the series stored in this dataset.
     *
     * @param i  the index of the series. Currently ignored.
     * 
     * @return The name of this series.
     */
    public Comparable getSeriesKey(int i) {
        return this.seriesKey;
    }
    
    /**
     * Return an item from within the dataset.
     * 
     * @param series  the series index (ignored, since this dataset contains
     *                only one series).
     * @param item  the item within the series (zero-based index)
     * 
     * @return The item.
     */
    public BoxAndWhiskerItem getItem(int series, int item) {
        return (BoxAndWhiskerItem) this.items.get(item);  
    }

    /**
     * Returns the x-value for one item in a series.
     * <p>
     * The value returned is a Long object generated from the underlying Date 
     * object.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The x-value.
     */
    public Number getX(int series, int item) {
        return new Long(((Date) this.dates.get(item)).getTime());
    }

    /**
     * Returns the x-value for one item in a series, as a Date.
     * <p>
     * This method is provided for convenience only.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The x-value as a Date.
     */
    public Date getXDate(int series, int item) {
        return (Date) this.dates.get(item);
    }

    /**
     * Returns the y-value for one item in a series.
     * <p>
     * This method (from the XYDataset interface) is mapped to the 
     * getMaxNonOutlierValue() method.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The y-value.
     */
    public Number getY(int series, int item) {
        return new Double(getMeanValue(series, item).doubleValue());  
    }

    /**
     * Returns the mean for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The mean for the specified series and item.
     */
    public Number getMeanValue(int series, int item) {
        Number result = null;
        BoxAndWhiskerItem stats = (BoxAndWhiskerItem) this.items.get(item);
        if (stats != null) {
            result = stats.getMean();
        }
        return result;
    }

    /**
     * Returns the median-value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *