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jfreechart example source code file (XYTaskDataset.java)

This example jfreechart source code file (XYTaskDataset.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, date, date, double, double, illegalargumentexception, number, number, task, taskseries, taskseriescollection, timeperiod, util, xytaskdataset, xytaskdataset

The jfreechart XYTaskDataset.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.]
 *
 * ------------------
 * XYTaskDataset.java
 * ------------------
 * (C) Copyright 2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 17-Sep-2008 : Version 1 (DG);
 *
 */

package org.jfree.data.gantt;

import java.util.Date;

import org.jfree.chart.axis.SymbolAxis;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.general.DatasetChangeListener;
import org.jfree.data.time.TimePeriod;
import org.jfree.data.xy.AbstractXYDataset;
import org.jfree.data.xy.IntervalXYDataset;

/**
 * A dataset implementation that wraps a {@link TaskSeriesCollection} and
 * presents it as an {@link IntervalXYDataset}, allowing a set of tasks to
 * be displayed using an {@link XYBarRenderer} (and usually a
 * {@link SymbolAxis}).  This is a very specialised dataset implementation
 * ---before using it, you should take some time to understand the use-cases
 * that it is designed for.
 *
 * @since 1.0.11
 */
public class XYTaskDataset extends AbstractXYDataset
        implements IntervalXYDataset, DatasetChangeListener {

    /** The underlying tasks. */
    private TaskSeriesCollection underlying;

    /** The series interval width (typically 0.0 < w <= 1.0). */
    private double seriesWidth;

    /** A flag that controls whether or not the data values are transposed. */
    private boolean transposed;

    /**
     * Creates a new dataset based on the supplied collection of tasks.
     *
     * @param tasks  the underlying dataset (<code>null not permitted).
     */
    public XYTaskDataset(TaskSeriesCollection tasks) {
        if (tasks == null) {
            throw new IllegalArgumentException("Null 'tasks' argument.");
        }
        this.underlying = tasks;
        this.seriesWidth = 0.8;
        this.underlying.addChangeListener(this);
    }

    /**
     * Returns the underlying task series collection that was supplied to the
     * constructor.
     *
     * @return The underlying collection (never <code>null).
     */
    public TaskSeriesCollection getTasks() {
        return this.underlying;
    }

    /**
     * Returns the width of the interval for each series this dataset.
     *
     * @return The width of the series interval.
     *
     * @see #setSeriesWidth(double)
     */
    public double getSeriesWidth() {
        return this.seriesWidth;
    }

    /**
     * Sets the series interval width and sends a {@link DatasetChangeEvent} to
     * all registered listeners.
     *
     * @param w  the width.
     *
     * @see #getSeriesWidth()
     */
    public void setSeriesWidth(double w) {
        if (w <= 0.0) {
            throw new IllegalArgumentException("Requires 'w' > 0.0.");
        }
        this.seriesWidth = w;
        fireDatasetChanged();
    }

    /**
     * Returns a flag that indicates whether or not the dataset is transposed.
     * The default is <code>false which means the x-values are integers
     * corresponding to the series indices, and the y-values are millisecond
     * values corresponding to the task date/time intervals.  If the flag
     * is set to <code>true, the x and y-values are reversed.
     *
     * @return The flag.
     *
     * @see #setTransposed(boolean)
     */
    public boolean isTransposed() {
        return this.transposed;
    }

    /**
     * Sets the flag that controls whether or not the dataset is transposed
     * and sends a {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param transposed  the new flag value.
     *
     * @see #isTransposed()
     */
    public void setTransposed(boolean transposed) {
        this.transposed = transposed;
        fireDatasetChanged();
    }

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

    /**
     * Returns the name of a series.
     *
     * @param series  the series index (zero-based).
     *
     * @return The name of a series.
     */
    public Comparable getSeriesKey(int series) {
        return this.underlying.getSeriesKey(series);
    }

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

    /**
     * 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.
     */
    public double getXValue(int series, int item) {
        if (!this.transposed) {
            return getSeriesValue(series);
        }
        else {
            return getItemValue(series, item);
        }
    }

    /**
     * Returns the starting date/time for the specified item (task) in the
     * given series, measured in milliseconds since 1-Jan-1970 (as in
     * java.util.Date).
     *
     * @param series  the series index.
     * @param item  the item (or task) index.
     *
     * @return The start date/time.
     */
    public double getStartXValue(int series, int item) {
        if (!this.transposed) {
            return getSeriesStartValue(series);
        }
        else {
            return getItemStartValue(series, item);
        }
    }

    /**
     * Returns the ending date/time for the specified item (task) in the
     * given series, measured in milliseconds since 1-Jan-1970 (as in
     * java.util.Date).
     *
     * @param series  the series index.
     * @param item  the item (or task) index.
     *
     * @return The end date/time.
     */
    public double getEndXValue(int series, int item) {
        if (!this.transposed) {
            return getSeriesEndValue(series);
        }
        else {
            return getItemEndValue(series, item);
        }
    }

    /**
     * Returns the x-value for the specified series.
     *
     * @param series  the series index.
     * @param item  the item index.
     *
     * @return The x-value (in milliseconds).
     */
    public Number getX(int series, int item) {
        return new Double(getXValue(series, item));
    }

    /**
     * Returns the starting date/time for the specified item (task) in the
     * given series, measured in milliseconds since 1-Jan-1970 (as in
     * java.util.Date).
     *
     * @param series  the series index.
     * @param item  the item (or task) index.
     *
     * @return The start date/time.
     */
    public Number getStartX(int series, int item) {
        return new Double(getStartXValue(series, item));
    }

    /**
     * Returns the ending date/time for the specified item (task) in the
     * given series, measured in milliseconds since 1-Jan-1970 (as in
     * java.util.Date).
     *
     * @param series  the series index.
     * @param item  the item (or task) index.
     *
     * @return The end date/time.
     */
    public Number getEndX(int series, int item) {
        return new Double(getEndXValue(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.
     */
    public double getYValue(int series, int item) {
        if (!this.transposed) {
            return getItemValue(series, item);
        }
        else {
            return getSeriesValue(series);
        }
    }

    /**
     * Returns the starting value of the y-interval for an item in the
     * given series.
     *
     * @param series  the series index.
     * @param item  the item (or task) index.
     *
     * @return The y-interval start.
     */
    public double getStartYValue(int series, int item) {
        if (!this.transposed) {
            return getItemStartValue(series, item);
        }
        else {
            return getSeriesStartValue(series);
        }
    }

    /**
     * Returns the ending value of the y-interval for an item in the
     * given series.
     *
     * @param series  the series index.
     * @param item  the item (or task) index.
     *
     * @return The y-interval end.
     */
    public double getEndYValue(int series, int item) {
        if (!this.transposed) {
            return getItemEndValue(series, item);
        }
        else {
            return getSeriesEndValue(series);
        }
    }

    /**
     * Returns the y-value for the specified series/item.  In this
     * implementation, we return the series index as the y-value (this means
     * that every item in the series has a constant integer value).
     *
     * @param series  the series index.
     * @param item  the item index.
     *
     * @return The y-value.
     */
    public Number getY(int series, int item) {
        return new Double(getYValue(series, item));
    }

    /**
     * Returns the starting value of the y-interval for an item in the
     * given series.
     *
     * @param series  the series index.
     * @param item  the item (or task) index.
     *
     * @return The y-interval start.
     */
    public Number getStartY(int series, int item) {
        return new Double(getStartYValue(series, item));
    }

    /**
     * Returns the ending value of the y-interval for an item in the
     * given series.
     *
     * @param series  the series index.
     * @param item  the item (or task) index.
     *
     * @return The y-interval end.
     */
    public Number getEndY(int series, int item) {
        return new Double(getEndYValue(series, item));
    }

    private double getSeriesValue(int series) {
        return series;
    }

    private double getSeriesStartValue(int series) {
        return series - this.seriesWidth / 2.0;
    }

    private double getSeriesEndValue(int series) {
        return series + this.seriesWidth / 2.0;
    }

    private double getItemValue(int series, int item) {
        TaskSeries s = this.underlying.getSeries(series);
        Task t = s.get(item);
        TimePeriod duration = t.getDuration();
        Date start = duration.getStart();
        Date end = duration.getEnd();
        return (start.getTime() + end.getTime()) / 2.0;
    }

    private double getItemStartValue(int series, int item) {
        TaskSeries s = this.underlying.getSeries(series);
        Task t = s.get(item);
        TimePeriod duration = t.getDuration();
        Date start = duration.getStart();
        return start.getTime();
    }

    private double getItemEndValue(int series, int item) {
        TaskSeries s = this.underlying.getSeries(series);
        Task t = s.get(item);
        TimePeriod duration = t.getDuration();
        Date end = duration.getEnd();
        return end.getTime();
    }


    /**
     * Receives a change event from the underlying dataset and responds by
     * firing a change event for this dataset.
     *
     * @param event  the event.
     */
    public void datasetChanged(DatasetChangeEvent event) {
        fireDatasetChanged();
    }

    /**
     * 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 XYTaskDataset)) {
            return false;
        }
        XYTaskDataset that = (XYTaskDataset) obj;
        if (this.seriesWidth != that.seriesWidth) {
            return false;
        }
        if (this.transposed != that.transposed) {
            return false;
        }
        if (!this.underlying.equals(that.underlying)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a clone of this dataset.
     *
     * @return A clone of this dataset.
     *
     * @throws CloneNotSupportedException if there is a problem cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        XYTaskDataset clone = (XYTaskDataset) super.clone();
        clone.underlying = (TaskSeriesCollection) this.underlying.clone();
        return clone;
    }

}

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