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jfreechart example source code file (DefaultWindDataset.java)

This example jfreechart source code file (DefaultWindDataset.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

comparable, date, defaultwinddataset, defaultwinddataset, illegalargumentexception, invalid, io, list, list, number, number, object, serializable, util, winddataitem, winddataitem

The jfreechart DefaultWindDataset.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.]
 *
 * -----------------------
 * DefaultWindDataset.java
 * -----------------------
 * (C) Copyright 2001-2008, by Achilleus Mantzios and Contributors.
 *
 * Original Author:  Achilleus Mantzios;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 06-Feb-2002 : Version 1, based on code contributed by Achilleus
 *               Mantzios (DG);
 * 05-May-2004 : Now extends AbstractXYDataset (DG);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
 *               getYValue() (DG);
 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
 * 22-Apr-2008 : Implemented PublicCloneable (DG);
 *
 */

package org.jfree.data.xy;

import java.io.Serializable;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.List;

import org.jfree.util.PublicCloneable;

/**
 * A default implementation of the {@link WindDataset} interface.
 */
public class DefaultWindDataset extends AbstractXYDataset
        implements WindDataset, PublicCloneable {

    /** The keys for the series. */
    private List seriesKeys;

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

    /**
     * Constructs a new, empty, dataset.  Since there are currently no methods
     * to add data to an existing dataset, you should probably use a different
     * constructor.
     */
    public DefaultWindDataset() {
        this.seriesKeys = new java.util.ArrayList();
        this.allSeriesData = new java.util.ArrayList();
    }

    /**
     * Constructs a dataset based on the specified data array.
     *
     * @param data  the data (<code>null not permitted).
     *
     * @throws NullPointerException if <code>data is null.
     */
    public DefaultWindDataset(Object[][][] data) {
        this(seriesNameListFromDataArray(data), data);
    }

    /**
     * Constructs a dataset based on the specified data array.
     *
     * @param seriesNames  the names of the series (<code>null not
     *     permitted).
     * @param data  the wind data.
     *
     * @throws NullPointerException if <code>seriesNames is
     *     <code>null.
     */
    public DefaultWindDataset(String[] seriesNames, Object[][][] data) {
        this(Arrays.asList(seriesNames), data);
    }

    /**
     * Constructs a dataset based on the specified data array.  The array
     * can contain multiple series, each series can contain multiple items,
     * and each item is as follows:
     * <ul>
     * <li>data[series][item][0] - the date (either a
     *   <code>Date or a Number that is the milliseconds
     *   since 1-Jan-1970);</li>
     * <li>data[series][item][1] - the wind direction (1 - 12,
     *   like the numbers on a clock face);</li>
     * <li>data[series][item][2] - the wind force (1 - 12 on the
     *   Beaufort scale)</li>
     * </ul>
     *
     * @param seriesKeys  the names of the series (<code>null not
     *     permitted).
     * @param data  the wind dataset (<code>null not permitted).
     *
     * @throws IllegalArgumentException if <code>seriesKeys is
     *     <code>null.
     * @throws IllegalArgumentException if the number of series keys does not
     *     match the number of series in the array.
     * @throws NullPointerException if <code>data is null.
     */
    public DefaultWindDataset(List seriesKeys, Object[][][] data) {
        if (seriesKeys == null) {
            throw new IllegalArgumentException("Null 'seriesKeys' argument.");
        }
        if (seriesKeys.size() != data.length) {
            throw new IllegalArgumentException("The number of series keys does "
                    + "not match the number of series in the data array.");
        }
        this.seriesKeys = seriesKeys;
        int seriesCount = data.length;
        this.allSeriesData = new java.util.ArrayList(seriesCount);

        for (int seriesIndex = 0; seriesIndex < seriesCount; seriesIndex++) {
            List oneSeriesData = new java.util.ArrayList();
            int maxItemCount = data[seriesIndex].length;
            for (int itemIndex = 0; itemIndex < maxItemCount; itemIndex++) {
                Object xObject = data[seriesIndex][itemIndex][0];
                if (xObject != null) {
                    Number xNumber;
                    if (xObject instanceof Number) {
                        xNumber = (Number) xObject;
                    }
                    else {
                        if (xObject instanceof Date) {
                            Date xDate = (Date) xObject;
                            xNumber = new Long(xDate.getTime());
                        }
                        else {
                            xNumber = new Integer(0);
                        }
                    }
                    Number windDir = (Number) data[seriesIndex][itemIndex][1];
                    Number windForce = (Number) data[seriesIndex][itemIndex][2];
                    oneSeriesData.add(new WindDataItem(xNumber, windDir,
                            windForce));
                }
            }
            Collections.sort(oneSeriesData);
            this.allSeriesData.add(seriesIndex, oneSeriesData);
        }

    }

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

    /**
     * Returns the number of items in a series.
     *
     * @param series  the series (zero-based index).
     *
     * @return The item count.
     */
    public int getItemCount(int series) {
        if (series < 0 || series >= getSeriesCount()) {
            throw new IllegalArgumentException("Invalid series index: "
                    + series);
        }
        List oneSeriesData = (List) this.allSeriesData.get(series);
        return oneSeriesData.size();
    }

    /**
     * Returns the key for a series.
     *
     * @param series  the series (zero-based index).
     *
     * @return The series key.
     */
    public Comparable getSeriesKey(int series) {
        if (series < 0 || series >= getSeriesCount()) {
            throw new IllegalArgumentException("Invalid series index: "
                    + series);
        }
        return (Comparable) this.seriesKeys.get(series);
    }

    /**
     * Returns the x-value for one item within a series.  This should represent
     * a point in time, encoded as milliseconds in the same way as
     * java.util.Date.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The x-value for the item within the series.
     */
    public Number getX(int series, int item) {
        List oneSeriesData = (List) this.allSeriesData.get(series);
        WindDataItem windItem = (WindDataItem) oneSeriesData.get(item);
        return windItem.getX();
    }

    /**
     * Returns the y-value for one item within a series.  This maps to the
     * {@link #getWindForce(int, int)} method and is implemented because
     * <code>WindDataset is an extension of {@link XYDataset}.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The y-value for the item within the series.
     */
    public Number getY(int series, int item) {
        return getWindForce(series, item);
    }

    /**
     * Returns the wind direction for one item within a series.  This is a
     * number between 0 and 12, like the numbers on an upside-down clock face.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The wind direction for the item within the series.
     */
    public Number getWindDirection(int series, int item) {
        List oneSeriesData = (List) this.allSeriesData.get(series);
        WindDataItem windItem = (WindDataItem) oneSeriesData.get(item);
        return windItem.getWindDirection();
    }

    /**
     * Returns the wind force for one item within a series.  This is a number
     * between 0 and 12, as defined by the Beaufort scale.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The wind force for the item within the series.
     */
    public Number getWindForce(int series, int item) {
        List oneSeriesData = (List) this.allSeriesData.get(series);
        WindDataItem windItem = (WindDataItem) oneSeriesData.get(item);
        return windItem.getWindForce();
    }

    /**
     * Utility method for automatically generating series names.
     *
     * @param data  the wind data (<code>null not permitted).
     *
     * @return An array of <i>Series N with N = { 1 .. data.length }.
     *
     * @throws NullPointerException if <code>data is null.
     */
    public static List seriesNameListFromDataArray(Object[][] data) {

        int seriesCount = data.length;
        List seriesNameList = new java.util.ArrayList(seriesCount);
        for (int i = 0; i < seriesCount; i++) {
            seriesNameList.add("Series " + (i + 1));
        }
        return seriesNameList;

    }

    /**
     * Checks this <code>WindDataset for equality with an arbitrary
     * object.  This method returns <code>true if and only if:
     * <ul>
     *   <li>obj is not null;
     *   <li>obj is an instance of
     *       <code>DefaultWindDataset;
     *   <li>both datasets have the same number of series containing identical
     *       values.</li>
     * <ul>
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof DefaultWindDataset)) {
            return false;
        }
        DefaultWindDataset that = (DefaultWindDataset) obj;
        if (!this.seriesKeys.equals(that.seriesKeys)) {
            return false;
        }
        if (!this.allSeriesData.equals(that.allSeriesData)) {
            return false;
        }
        return true;
    }

}

/**
 * A wind data item.
 */
class WindDataItem implements Comparable, Serializable {

    /** The x-value. */
    private Number x;

    /** The wind direction. */
    private Number windDir;

    /** The wind force. */
    private Number windForce;

    /**
     * Creates a new wind data item.
     *
     * @param x  the x-value.
     * @param windDir  the direction.
     * @param windForce  the force.
     */
    public WindDataItem(Number x, Number windDir, Number windForce) {
        this.x = x;
        this.windDir = windDir;
        this.windForce = windForce;
    }

    /**
     * Returns the x-value.
     *
     * @return The x-value.
     */
    public Number getX() {
        return this.x;
    }

    /**
     * Returns the wind direction.
     *
     * @return The wind direction.
     */
    public Number getWindDirection() {
        return this.windDir;
    }

    /**
     * Returns the wind force.
     *
     * @return The wind force.
     */
    public Number getWindForce() {
        return this.windForce;
    }

    /**
     * Compares this item to another object.
     *
     * @param object  the other object.
     *
     * @return An int that indicates the relative comparison.
     */
    public int compareTo(Object object) {
        if (object instanceof WindDataItem) {
            WindDataItem item = (WindDataItem) object;
            if (this.x.doubleValue() > item.x.doubleValue()) {
                return 1;
            }
            else if (this.x.equals(item.x)) {
                return 0;
            }
            else {
                return -1;
            }
        }
        else {
            throw new ClassCastException("WindDataItem.compareTo(error)");
        }
    }

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

}

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