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jfreechart example source code file (XYBarDataset.java)

This example jfreechart source code file (XYBarDataset.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, comparable, datasetchangeevent, datasetchangelistener, intervalxydataset, number, number, object, publiccloneable, publiccloneable, xybardataset, xybardataset, xydataset, xydataset

The jfreechart XYBarDataset.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.]
 *
 * -----------------
 * XYBarDataset.java
 * -----------------
 * (C) Copyright 2004-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 02-Mar-2004 : Version 1 (DG);
 * 05-May-2004 : Now extends AbstractIntervalXYDataset (DG);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
 *               getYValue() (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 25-Jan-2007 : Added some accessor methods, plus new equals() and clone()
 *               overrides (DG);
 * 30-Jan-2007 : Added method overrides to prevent unnecessary object
 *               creation (DG);
 * 22-Apr-2008 : Implemented PublicCloneable (DG);
 *
 */

package org.jfree.data.xy;

import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.general.DatasetChangeListener;
import org.jfree.util.PublicCloneable;

/**
 * A dataset wrapper class that converts a standard {@link XYDataset} into an
 * {@link IntervalXYDataset} suitable for use in creating XY bar charts.
 */
public class XYBarDataset extends AbstractIntervalXYDataset
        implements IntervalXYDataset, DatasetChangeListener, PublicCloneable {

    /** The underlying dataset. */
    private XYDataset underlying;

    /** The bar width. */
    private double barWidth;

    /**
     * Creates a new dataset.
     *
     * @param underlying  the underlying dataset (<code>null not
     *     permitted).
     * @param barWidth  the width of the bars.
     */
    public XYBarDataset(XYDataset underlying, double barWidth) {
        this.underlying = underlying;
        this.underlying.addChangeListener(this);
        this.barWidth = barWidth;
    }

    /**
     * Returns the underlying dataset that was specified via the constructor.
     *
     * @return The underlying dataset (never <code>null).
     *
     * @since 1.0.4
     */
    public XYDataset getUnderlyingDataset() {
        return this.underlying;
    }

    /**
     * Returns the bar width.
     *
     * @return The bar width.
     *
     * @see #setBarWidth(double)
     * @since 1.0.4
     */
    public double getBarWidth() {
        return this.barWidth;
    }

    /**
     * Sets the bar width and sends a {@link DatasetChangeEvent} to all
     * registered listeners.
     *
     * @param barWidth  the bar width.
     *
     * @see #getBarWidth()
     * @since 1.0.4
     */
    public void setBarWidth(double barWidth) {
        this.barWidth = barWidth;
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Returns the number of series in the dataset.
     *
     * @return The series count.
     */
    public int getSeriesCount() {
        return this.underlying.getSeriesCount();
    }

    /**
     * Returns the key for a series.
     *
     * @param series  the series index (in the range <code>0 to
     *     <code>getSeriesCount() - 1).
     *
     * @return The series key.
     */
    public Comparable getSeriesKey(int series) {
        return this.underlying.getSeriesKey(series);
    }

    /**
     * Returns the number of items in a series.
     *
     * @param series  the series index (zero-based).
     *
     * @return The item count.
     */
    public int getItemCount(int series) {
        return this.underlying.getItemCount(series);
    }

    /**
     * Returns the x-value for an item within a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The x-value.
     *
     * @see #getXValue(int, int)
     */
    public Number getX(int series, int item) {
        return this.underlying.getX(series, item);
    }

    /**
     * Returns the x-value (as a double primitive) for an item within a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     *
     * @see #getX(int, int)
     */
    public double getXValue(int series, int item) {
        return this.underlying.getXValue(series, item);
    }

    /**
     * Returns the y-value for an item within a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The y-value (possibly <code>null).
     *
     * @see #getYValue(int, int)
     */
    public Number getY(int series, int item) {
        return this.underlying.getY(series, item);
    }

    /**
     * Returns the y-value (as a double primitive) for an item within a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     *
     * @see #getY(int, int)
     */
    public double getYValue(int series, int item) {
        return this.underlying.getYValue(series, item);
    }

    /**
     * Returns the starting X value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getStartX(int series, int item) {
        Number result = null;
        Number xnum = this.underlying.getX(series, item);
        if (xnum != null) {
             result = new Double(xnum.doubleValue() - this.barWidth / 2.0);
        }
        return result;
    }

    /**
     * Returns the starting x-value (as a double primitive) for an item within
     * a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     *
     * @see #getXValue(int, int)
     */
    public double getStartXValue(int series, int item) {
        return getXValue(series, item) - this.barWidth / 2.0;
    }

    /**
     * Returns the ending X value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getEndX(int series, int item) {
        Number result = null;
        Number xnum = this.underlying.getX(series, item);
        if (xnum != null) {
             result = new Double(xnum.doubleValue() + this.barWidth / 2.0);
        }
        return result;
    }

    /**
     * Returns the ending x-value (as a double primitive) for an item within
     * a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     *
     * @see #getXValue(int, int)
     */
    public double getEndXValue(int series, int item) {
        return getXValue(series, item) + this.barWidth / 2.0;
    }

    /**
     * Returns the starting Y value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getStartY(int series, int item) {
        return this.underlying.getY(series, item);
    }

    /**
     * Returns the starting y-value (as a double primitive) for an item within
     * a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     *
     * @see #getYValue(int, int)
     */
    public double getStartYValue(int series, int item) {
        return getYValue(series, item);
    }

    /**
     * Returns the ending Y value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getEndY(int series, int item) {
        return this.underlying.getY(series, item);
    }

    /**
     * Returns the ending y-value (as a double primitive) for an item within
     * a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     *
     * @see #getYValue(int, int)
     */
    public double getEndYValue(int series, int item) {
        return getYValue(series, item);
    }

    /**
     * Receives notification of an dataset change event.
     *
     * @param event  information about the event.
     */
    public void datasetChanged(DatasetChangeEvent event) {
        notifyListeners(event);
    }

    /**
     * Tests this dataset for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof XYBarDataset)) {
            return false;
        }
        XYBarDataset that = (XYBarDataset) obj;
        if (!this.underlying.equals(that.underlying)) {
            return false;
        }
        if (this.barWidth != that.barWidth) {
            return false;
        }
        return true;
    }

    /**
     * Returns an independent copy of the dataset.  Note that:
     * <ul>
     * <li>the underlying dataset is only cloned if it implements the
     * {@link PublicCloneable} interface;</li>
     * <li>the listeners registered with this dataset are not carried over to
     * the cloned dataset.</li>
     * </ul>
     *
     * @return An independent copy of the dataset.
     *
     * @throws CloneNotSupportedException if the dataset cannot be cloned for
     *         any reason.
     */
    public Object clone() throws CloneNotSupportedException {
        XYBarDataset clone = (XYBarDataset) super.clone();
        if (this.underlying instanceof PublicCloneable) {
            PublicCloneable pc = (PublicCloneable) this.underlying;
            clone.underlying = (XYDataset) pc.clone();
        }
        return clone;
    }

}

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