defaultwinddataset.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 342 行

/* ===========================================================
 * 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.]
 *
 * -----------------------
 * DefaultWindDataset.java
 * -----------------------
 * (C) Copyright 2001-2005, by Achilleus Mantzios and Contributors.
 *
 * Original Author:  Achilleus Mantzios;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: DefaultWindDataset.java,v 1.5 2005/05/20 08:20:03 mungady Exp $
 *
 * 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);
 *
 */

package org.jfree.data.xy;

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

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

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

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

    /**
     * Constructs a new, empty, dataset.
     */
    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.
     */
    public DefaultWindDataset(Object[][][] data) {
        this(seriesNameListFromDataArray(data), data);
    }

    /**
     * Constructs a dataset based on the specified data array.
     *
     * @param seriesNames    the names of the series.
     * @param data  the wind data.
     */
    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><code>data[series][item][0]</code> - the date (either a 
     *   <code>Date</code> or a <code>Number</code> that is the milliseconds 
     *   since 1-Jan-1970);</li>
     * <li><code>data[series][item][1]</code> - the wind direction (1 - 12, 
     *   like the numbers on a clock face);</li>
     * <li><code>data[series][item][2]</code> - the wind force (1 - 12 on the
     *   Beaufort scale)</li>
     * </ul>
     * 
     * @param seriesKeys  the names of the series.
     * @param data  the wind dataset.
     */
    public DefaultWindDataset(List seriesKeys, Object[][][] data) {

        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) {
        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) {
        return this.seriesKeys.get(series).toString();
    }

    /**
     * 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</code> 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 a 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 dataset.
     *
     * @return An array of <i>Series N</i> with N = { 1 .. data.length }.
     */
    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;

    }

}

/**
 * A wind data item.
 *
 * @author Achilleus Mantzios
 */
class WindDataItem implements Comparable {

    /** 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)");
        }
    }

}