standardxyztooltipgenerator.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 262 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.]
 *
 * --------------------------------
 * StandardXYZToolTipGenerator.java
 * --------------------------------
 * (C) Copyright 2004, 2005, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: StandardXYZToolTipGenerator.java,v 1.5 2005/05/20 08:20:03 mungady Exp $
 *
 * Changes
 * -------
 * 11-May-2003 : Version 1, split from StandardXYZItemLabelGenerator (DG);
 * 15-Jul-2004 : Switched getZ() and getZValue() methods (DG);
 *
 */

package org.jfree.chart.labels;

import java.io.Serializable;
import java.text.DateFormat;
import java.text.MessageFormat;
import java.text.NumberFormat;

import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYZDataset;
import org.jfree.util.ObjectUtilities;

/**
 * A standard item label generator for use with {@link XYZDataset} data.  Each 
 * value can be formatted as a number or as a date.
 */
public class StandardXYZToolTipGenerator extends StandardXYToolTipGenerator
                                         implements XYZToolTipGenerator,
                                                    Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -2961577421889473503L;
    
    /** The default tooltip format. */
    public static final String DEFAULT_TOOL_TIP_FORMAT = "{0}: ({1}, {2}, {3})";

    /** 
     * A number formatter for the z value - if this is null, then zDateFormat 
     * must be non-null. 
     */
    private NumberFormat zFormat;
    
    /** 
     * A date formatter for the z-value - if this is null, then zFormat must be 
     * non-null. 
     */
    private DateFormat zDateFormat;

    /**
     * Creates a new tool tip generator using default number formatters for the
     * x, y and z-values.
     */
    public StandardXYZToolTipGenerator() {
        this(
            DEFAULT_TOOL_TIP_FORMAT,
            NumberFormat.getNumberInstance(),
            NumberFormat.getNumberInstance(),
            NumberFormat.getNumberInstance()
        );
    }

    /**
     * Constructs a new tool tip generator using the specified number 
     * formatters.
     *
     * @param formatString  the format string.
     * @param xFormat  the format object for the x values (<code>null</code> 
     *                 not permitted).
     * @param yFormat  the format object for the y values (<code>null</code> 
     *                 not permitted).
     * @param zFormat  the format object for the z values (<code>null</code> 
     *                 not permitted).
     */
    public StandardXYZToolTipGenerator(String formatString,
                                       NumberFormat xFormat,
                                       NumberFormat yFormat,
                                       NumberFormat zFormat) {
        super(formatString, xFormat, yFormat);
        if (zFormat == null) {
            throw new IllegalArgumentException("Null 'zFormat' argument.");   
        }
        this.zFormat = zFormat;
    }

    /**
     * Constructs a new tool tip generator using the specified date formatters.
     *
     * @param formatString  the format string.
     * @param xFormat  the format object for the x values (<code>null</code> 
     *                 not permitted).
     * @param yFormat  the format object for the y values (<code>null</code> 
     *                 not permitted).
     * @param zFormat  the format object for the z values (<code>null</code> 
     *                 not permitted).
     */
    public StandardXYZToolTipGenerator(String formatString,
                                       DateFormat xFormat,
                                       DateFormat yFormat,
                                       DateFormat zFormat) {
        super(formatString, xFormat, yFormat);
        if (zFormat == null) {
            throw new IllegalArgumentException("Null 'zFormat' argument.");   
        }
        this.zDateFormat = zFormat;
    }

    // TODO:  add constructors for combinations of number and date formatters.
    
    /**
     * Returns the number formatter for the z-values.
     *
     * @return The number formatter (possibly <code>null</code>).
     */
    public NumberFormat getZFormat() {
        return this.zFormat;
    }
    
    /**
     * Returns the date formatter for the z-values.
     *
     * @return The date formatter (possibly <code>null</code>).
     */
    public DateFormat getZDateFormat() {
        return this.zDateFormat;   
    }

    /**
     * Generates a tool tip text item for a particular item within a series.
     *
     * @param dataset  the dataset (<code>null</code> not permitted).
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The tooltip text (possibly <code>null</code>).
     */
    public String generateToolTip(XYZDataset dataset, int series, int item) {
        return generateLabelString(dataset, series, item);
    }
    
    /**
     * Generates a label string for an item in the dataset.
     *
     * @param dataset  the dataset (<code>null</code> not permitted).
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The label (possibly <code>null</code>).
     */
    public String generateLabelString(XYDataset dataset, int series, int item) {
        String result = null;    
        Object[] items = createItemArray((XYZDataset) dataset, series, item);
        result = MessageFormat.format(getFormatString(), items);
        return result;
    }

    /**
     * Creates the array of items that can be passed to the 
     * {@link MessageFormat} class for creating labels.
     *
     * @param dataset  the dataset (<code>null</code> not permitted).
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The items (never <code>null</code>).
     */
    protected Object[] createItemArray(XYZDataset dataset, 
                                       int series, int item) {

        Object[] result = new Object[4];
        result[0] = dataset.getSeriesKey(series).toString();
        
        Number x = dataset.getX(series, item);
        DateFormat xf = getXDateFormat();
        if (xf != null) {
            result[1] = xf.format(x);   
        }
        else {
            result[1] = getXFormat().format(x);
        }
        
        Number y = dataset.getY(series, item);
        DateFormat yf = getYDateFormat();
        if (yf != null) {
            result[2] = yf.format(y);
        }
        else {
            result[2] = getYFormat().format(y);
        }
        
        Number z = dataset.getZ(series, item);
        if (this.zDateFormat != null) {
            result[3] = this.zDateFormat.format(z);   
        }
        else {
            result[3] = this.zFormat.format(z);   
        }
        
        return result;
        
    }

    /**
     * Tests this object for equality with an arbitrary object.
     *
     * @param obj  the other object (<code>null</code> permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof StandardXYZToolTipGenerator)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        StandardXYZToolTipGenerator that = (StandardXYZToolTipGenerator) obj;
        if (!ObjectUtilities.equal(this.zFormat, that.zFormat)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.zDateFormat, that.zDateFormat)) {
            return false;
        }
        return true;

    }

}