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jfreechart example source code file (TimeSeriesCollection.java)

This example jfreechart source code file (TimeSeriesCollection.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

datasetchangeevent, illegalargumentexception, io, iterator, null, number, number, range, range, regulartimeperiod, timeseries, timeseries, timeseriescollection, timeseriescollection, timeseriesdataitem, util

The jfreechart TimeSeriesCollection.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, 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.]
 *
 * -------------------------
 * TimeSeriesCollection.java
 * -------------------------
 * (C) Copyright 2001-2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 11-Oct-2001 : Version 1 (DG);
 * 18-Oct-2001 : Added implementation of IntervalXYDataSource so that bar plots
 *               (using numerical axes) can be plotted from time series
 *               data (DG);
 * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
 * 15-Nov-2001 : Added getSeries() method.  Changed name from TimeSeriesDataset
 *               to TimeSeriesCollection (DG);
 * 07-Dec-2001 : TimeSeries --> BasicTimeSeries (DG);
 * 01-Mar-2002 : Added a time zone offset attribute, to enable fast calculation
 *               of the time period start and end values (DG);
 * 29-Mar-2002 : The collection now registers itself with all the time series
 *               objects as a SeriesChangeListener.  Removed redundant
 *               calculateZoneOffset method (DG);
 * 06-Jun-2002 : Added a setting to control whether the x-value supplied in the
 *               getXValue() method comes from the START, MIDDLE, or END of the
 *               time period.  This is a workaround for JFreeChart, where the
 *               current date axis always labels the start of a time
 *               period (DG);
 * 24-Jun-2002 : Removed unnecessary import (DG);
 * 24-Aug-2002 : Implemented DomainInfo interface, and added the
 *               DomainIsPointsInTime flag (DG);
 * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 16-Oct-2002 : Added remove methods (DG);
 * 10-Jan-2003 : Changed method names in RegularTimePeriod class (DG);
 * 13-Mar-2003 : Moved to com.jrefinery.data.time package and implemented
 *               Serializable (DG);
 * 04-Sep-2003 : Added getSeries(String) method (DG);
 * 15-Sep-2003 : Added a removeAllSeries() method to match
 *               XYSeriesCollection (DG);
 * 05-May-2004 : Now extends AbstractIntervalXYDataset (DG);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
 *               getYValue() (DG);
 * 06-Oct-2004 : Updated for changed in DomainInfo interface (DG);
 * 11-Jan-2005 : Removed deprecated code in preparation for the 1.0.0
 *               release (DG);
 * 28-Mar-2005 : Fixed bug in getSeries(int) method (1170825) (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 13-Dec-2005 : Deprecated the 'domainIsPointsInTime' flag as it is
 *               redundant.  Fixes bug 1243050 (DG);
 * 04-May-2007 : Override getDomainOrder() to indicate that items are sorted
 *               by x-value (ascending) (DG);
 * 08-May-2007 : Added indexOf(TimeSeries) method (DG);
 * 18-Jan-2008 : Changed getSeries(String) to getSeries(Comparable) (DG);
 *
 */

package org.jfree.data.time;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.TimeZone;

import org.jfree.data.DomainInfo;
import org.jfree.data.DomainOrder;
import org.jfree.data.Range;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.xy.AbstractIntervalXYDataset;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.util.ObjectUtilities;

/**
 * A collection of time series objects.  This class implements the
 * {@link org.jfree.data.xy.XYDataset} interface, as well as the extended
 * {@link IntervalXYDataset} interface.  This makes it a convenient dataset for
 * use with the {@link org.jfree.chart.plot.XYPlot} class.
 */
public class TimeSeriesCollection extends AbstractIntervalXYDataset
        implements XYDataset, IntervalXYDataset, DomainInfo, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 834149929022371137L;

    /** Storage for the time series. */
    private List data;

    /** A working calendar (to recycle) */
    private Calendar workingCalendar;

    /**
     * The point within each time period that is used for the X value when this
     * collection is used as an {@link org.jfree.data.xy.XYDataset}.  This can
     * be the start, middle or end of the time period.
     */
    private TimePeriodAnchor xPosition;

    /**
     * A flag that indicates that the domain is 'points in time'.  If this
     * flag is true, only the x-value is used to determine the range of values
     * in the domain, the start and end x-values are ignored.
     *
     * @deprecated No longer used (as of 1.0.1).
     */
    private boolean domainIsPointsInTime;

    /**
     * Constructs an empty dataset, tied to the default timezone.
     */
    public TimeSeriesCollection() {
        this(null, TimeZone.getDefault());
    }

    /**
     * Constructs an empty dataset, tied to a specific timezone.
     *
     * @param zone  the timezone (<code>null permitted, will use
     *              <code>TimeZone.getDefault() in that case).
     */
    public TimeSeriesCollection(TimeZone zone) {
        // FIXME: need a locale as well as a timezone
        this(null, zone);
    }

    /**
     * Constructs a dataset containing a single series (more can be added),
     * tied to the default timezone.
     *
     * @param series the series (<code>null permitted).
     */
    public TimeSeriesCollection(TimeSeries series) {
        this(series, TimeZone.getDefault());
    }

    /**
     * Constructs a dataset containing a single series (more can be added),
     * tied to a specific timezone.
     *
     * @param series  a series to add to the collection (<code>null
     *                permitted).
     * @param zone  the timezone (<code>null permitted, will use
     *              <code>TimeZone.getDefault() in that case).
     */
    public TimeSeriesCollection(TimeSeries series, TimeZone zone) {
        // FIXME:  need a locale as well as a timezone
        if (zone == null) {
            zone = TimeZone.getDefault();
        }
        this.workingCalendar = Calendar.getInstance(zone);
        this.data = new ArrayList();
        if (series != null) {
            this.data.add(series);
            series.addChangeListener(this);
        }
        this.xPosition = TimePeriodAnchor.START;
        this.domainIsPointsInTime = true;

    }

    /**
     * Returns a flag that controls whether the domain is treated as 'points in
     * time'.  This flag is used when determining the max and min values for
     * the domain.  If <code>true, then only the x-values are considered
     * for the max and min values.  If <code>false, then the start and
     * end x-values will also be taken into consideration.
     *
     * @return The flag.
     *
     * @deprecated This flag is no longer used (as of 1.0.1).
     */
    public boolean getDomainIsPointsInTime() {
        return this.domainIsPointsInTime;
    }

    /**
     * Sets a flag that controls whether the domain is treated as 'points in
     * time', or time periods.
     *
     * @param flag  the flag.
     *
     * @deprecated This flag is no longer used, as of 1.0.1.  The
     *             <code>includeInterval flag in methods such as
     *             {@link #getDomainBounds(boolean)} makes this unnecessary.
     */
    public void setDomainIsPointsInTime(boolean flag) {
        this.domainIsPointsInTime = flag;
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Returns the order of the domain values in this dataset.
     *
     * @return {@link DomainOrder#ASCENDING}
     */
    public DomainOrder getDomainOrder() {
        return DomainOrder.ASCENDING;
    }

    /**
     * Returns the position within each time period that is used for the X
     * value when the collection is used as an
     * {@link org.jfree.data.xy.XYDataset}.
     *
     * @return The anchor position (never <code>null).
     */
    public TimePeriodAnchor getXPosition() {
        return this.xPosition;
    }

    /**
     * Sets the position within each time period that is used for the X values
     * when the collection is used as an {@link XYDataset}, then sends a
     * {@link DatasetChangeEvent} is sent to all registered listeners.
     *
     * @param anchor  the anchor position (<code>null not permitted).
     */
    public void setXPosition(TimePeriodAnchor anchor) {
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.xPosition = anchor;
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Returns a list of all the series in the collection.
     *
     * @return The list (which is unmodifiable).
     */
    public List getSeries() {
        return Collections.unmodifiableList(this.data);
    }

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

    /**
     * Returns the index of the specified series, or -1 if that series is not
     * present in the dataset.
     *
     * @param series  the series (<code>null not permitted).
     *
     * @return The series index.
     *
     * @since 1.0.6
     */
    public int indexOf(TimeSeries series) {
        if (series == null) {
            throw new IllegalArgumentException("Null 'series' argument.");
        }
        return this.data.indexOf(series);
    }

    /**
     * Returns a series.
     *
     * @param series  the index of the series (zero-based).
     *
     * @return The series.
     */
    public TimeSeries getSeries(int series) {
        if ((series < 0) || (series >= getSeriesCount())) {
            throw new IllegalArgumentException(
                "The 'series' argument is out of bounds (" + series + ").");
        }
        return (TimeSeries) this.data.get(series);
    }

    /**
     * Returns the series with the specified key, or <code>null if
     * there is no such series.
     *
     * @param key  the series key (<code>null permitted).
     *
     * @return The series with the given key.
     */
    public TimeSeries getSeries(Comparable key) {
        TimeSeries result = null;
        Iterator iterator = this.data.iterator();
        while (iterator.hasNext()) {
            TimeSeries series = (TimeSeries) iterator.next();
            Comparable k = series.getKey();
            if (k != null && k.equals(key)) {
                result = series;
            }
        }
        return result;
    }

    /**
     * Returns the key for a series.
     *
     * @param series  the index of the series (zero-based).
     *
     * @return The key for a series.
     */
    public Comparable getSeriesKey(int series) {
        // check arguments...delegated
        // fetch the series name...
        return getSeries(series).getKey();
    }

    /**
     * Adds a series to the collection and sends a {@link DatasetChangeEvent} to
     * all registered listeners.
     *
     * @param series  the series (<code>null not permitted).
     */
    public void addSeries(TimeSeries series) {
        if (series == null) {
            throw new IllegalArgumentException("Null 'series' argument.");
        }
        this.data.add(series);
        series.addChangeListener(this);
        fireDatasetChanged();
    }

    /**
     * Removes the specified series from the collection and sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param series  the series (<code>null not permitted).
     */
    public void removeSeries(TimeSeries series) {
        if (series == null) {
            throw new IllegalArgumentException("Null 'series' argument.");
        }
        this.data.remove(series);
        series.removeChangeListener(this);
        fireDatasetChanged();
    }

    /**
     * Removes a series from the collection.
     *
     * @param index  the series index (zero-based).
     */
    public void removeSeries(int index) {
        TimeSeries series = getSeries(index);
        if (series != null) {
            removeSeries(series);
        }
    }

    /**
     * Removes all the series from the collection and sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     */
    public void removeAllSeries() {

        // deregister the collection as a change listener to each series in the
        // collection
        for (int i = 0; i < this.data.size(); i++) {
            TimeSeries series = (TimeSeries) this.data.get(i);
            series.removeChangeListener(this);
        }

        // remove all the series from the collection and notify listeners.
        this.data.clear();
        fireDatasetChanged();

    }

    /**
     * Returns the number of items in the specified series.  This method is
     * provided for convenience.
     *
     * @param series  the series index (zero-based).
     *
     * @return The item count.
     */
    public int getItemCount(int series) {
        return getSeries(series).getItemCount();
    }

    /**
     * Returns the x-value (as a double primitive) for an item within a series.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The x-value.
     */
    public double getXValue(int series, int item) {
        TimeSeries s = (TimeSeries) this.data.get(series);
        TimeSeriesDataItem i = s.getDataItem(item);
        RegularTimePeriod period = i.getPeriod();
        return getX(period);
    }

    /**
     * Returns the x-value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The value.
     */
    public Number getX(int series, int item) {
        TimeSeries ts = (TimeSeries) this.data.get(series);
        TimeSeriesDataItem dp = ts.getDataItem(item);
        RegularTimePeriod period = dp.getPeriod();
        return new Long(getX(period));
    }

    /**
     * Returns the x-value for a time period.
     *
     * @param period  the time period (<code>null not permitted).
     *
     * @return The x-value.
     */
    protected synchronized long getX(RegularTimePeriod period) {
        long result = 0L;
        if (this.xPosition == TimePeriodAnchor.START) {
            result = period.getFirstMillisecond(this.workingCalendar);
        }
        else if (this.xPosition == TimePeriodAnchor.MIDDLE) {
            result = period.getMiddleMillisecond(this.workingCalendar);
        }
        else if (this.xPosition == TimePeriodAnchor.END) {
            result = period.getLastMillisecond(this.workingCalendar);
        }
        return result;
    }

    /**
     * Returns the starting X value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The value.
     */
    public synchronized Number getStartX(int series, int item) {
        TimeSeries ts = (TimeSeries) this.data.get(series);
        TimeSeriesDataItem dp = ts.getDataItem(item);
        return new Long(dp.getPeriod().getFirstMillisecond(
                this.workingCalendar));
    }

    /**
     * Returns the ending X value for the specified series and item.
     *
     * @param series The series (zero-based index).
     * @param item  The item (zero-based index).
     *
     * @return The value.
     */
    public synchronized Number getEndX(int series, int item) {
        TimeSeries ts = (TimeSeries) this.data.get(series);
        TimeSeriesDataItem dp = ts.getDataItem(item);
        return new Long(dp.getPeriod().getLastMillisecond(
                this.workingCalendar));
    }

    /**
     * Returns the y-value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The value (possibly <code>null).
     */
    public Number getY(int series, int item) {
        TimeSeries ts = (TimeSeries) this.data.get(series);
        TimeSeriesDataItem dp = ts.getDataItem(item);
        return dp.getValue();
    }

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

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


    /**
     * Returns the indices of the two data items surrounding a particular
     * millisecond value.
     *
     * @param series  the series index.
     * @param milliseconds  the time.
     *
     * @return An array containing the (two) indices of the items surrounding
     *         the time.
     */
    public int[] getSurroundingItems(int series, long milliseconds) {
        int[] result = new int[] {-1, -1};
        TimeSeries timeSeries = getSeries(series);
        for (int i = 0; i < timeSeries.getItemCount(); i++) {
            Number x = getX(series, i);
            long m = x.longValue();
            if (m <= milliseconds) {
                result[0] = i;
            }
            if (m >= milliseconds) {
                result[1] = i;
                break;
            }
        }
        return result;
    }

    /**
     * Returns the minimum x-value in the dataset.
     *
     * @param includeInterval  a flag that determines whether or not the
     *                         x-interval is taken into account.
     *
     * @return The minimum value.
     */
    public double getDomainLowerBound(boolean includeInterval) {
        double result = Double.NaN;
        Range r = getDomainBounds(includeInterval);
        if (r != null) {
            result = r.getLowerBound();
        }
        return result;
    }

    /**
     * Returns the maximum x-value in the dataset.
     *
     * @param includeInterval  a flag that determines whether or not the
     *                         x-interval is taken into account.
     *
     * @return The maximum value.
     */
    public double getDomainUpperBound(boolean includeInterval) {
        double result = Double.NaN;
        Range r = getDomainBounds(includeInterval);
        if (r != null) {
            result = r.getUpperBound();
        }
        return result;
    }

    /**
     * Returns the range of the values in this dataset's domain.
     *
     * @param includeInterval  a flag that determines whether or not the
     *                         x-interval is taken into account.
     *
     * @return The range.
     */
    public Range getDomainBounds(boolean includeInterval) {
        Range result = null;
        Iterator iterator = this.data.iterator();
        while (iterator.hasNext()) {
            TimeSeries series = (TimeSeries) iterator.next();
            int count = series.getItemCount();
            if (count > 0) {
                RegularTimePeriod start = series.getTimePeriod(0);
                RegularTimePeriod end = series.getTimePeriod(count - 1);
                Range temp;
                if (!includeInterval) {
                    temp = new Range(getX(start), getX(end));
                }
                else {
                    temp = new Range(
                            start.getFirstMillisecond(this.workingCalendar),
                            end.getLastMillisecond(this.workingCalendar));
                }
                result = Range.combine(result, temp);
            }
        }
        return result;
    }

    /**
     * Tests this time series collection for equality with another object.
     *
     * @param obj  the other object.
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof TimeSeriesCollection)) {
            return false;
        }
        TimeSeriesCollection that = (TimeSeriesCollection) obj;
        if (this.xPosition != that.xPosition) {
            return false;
        }
        if (this.domainIsPointsInTime != that.domainIsPointsInTime) {
            return false;
        }
        if (!ObjectUtilities.equal(this.data, that.data)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code value for the object.
     *
     * @return The hashcode
     */
    public int hashCode() {
        int result;
        result = this.data.hashCode();
        result = 29 * result + (this.workingCalendar != null
                ? this.workingCalendar.hashCode() : 0);
        result = 29 * result + (this.xPosition != null
                ? this.xPosition.hashCode() : 0);
        result = 29 * result + (this.domainIsPointsInTime ? 1 : 0);
        return result;
    }

}

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