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jfreechart example source code file (AbstractXYItemLabelGenerator.java)

This example jfreechart source code file (AbstractXYItemLabelGenerator.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

abstractxyitemlabelgenerator, abstractxyitemlabelgenerator, clonenotsupportedexception, date, dateformat, dateformat, illegalargumentexception, io, null, numberformat, numberformat, object, serializable, string, string, text, util

The jfreechart AbstractXYItemLabelGenerator.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.]
 *
 * ---------------------------------
 * AbstractXYItemLabelGenerator.java
 * ---------------------------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 27-Feb-2004 : Version 1 (DG);
 * 12-May-2004 : Moved default tool tip format to
 *               StandardXYToolTipGenerator (DG);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
 *               getYValue() (DG);
 * 08-Oct-2004 : Modified createItemArray() method to handle null values (DG);
 * 10-Jan-2005 : Updated createItemArray() to use x, y primitives if
 *               possible (DG);
 * ------------- JFREECHART 1.0.x --------------------------------------------
 * 26-Jan-2006 : Minor API doc update (DG);
 * 25-Jan-2007 : Added new constructor and fixed bug in clone() method (DG);
 * 16-Oct-2007 : Removed redundant code (DG);
 * 23-Nov-2007 : Implemented hashCode() (DG);
 * 26-May-2008 : Added accessor methods for nullYString and updated equals()
 *               method (DG);
 *
 */

package org.jfree.chart.labels;

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

import org.jfree.chart.HashUtilities;
import org.jfree.data.xy.XYDataset;
import org.jfree.util.ObjectUtilities;

/**
 * A base class for creating item label generators.
 */
public class AbstractXYItemLabelGenerator implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 5869744396278660636L;

    /** The item label format string. */
    private String formatString;

    /** A number formatter for the x value. */
    private NumberFormat xFormat;

    /** A date formatter for the x value. */
    private DateFormat xDateFormat;

    /** A formatter for the y value. */
    private NumberFormat yFormat;

    /** A date formatter for the y value. */
    private DateFormat yDateFormat;

    /** The string used to represent 'null' for the y-value. */
    private String nullYString = "null";

    /**
     * Creates an item label generator using default number formatters.
     */
    protected AbstractXYItemLabelGenerator() {
        this("{2}", NumberFormat.getNumberInstance(),
                NumberFormat.getNumberInstance());
    }

    /**
     * Creates an item label generator using the specified number formatters.
     *
     * @param formatString  the item label format string (<code>null
     *                      not permitted).
     * @param xFormat  the format object for the x values (<code>null
     *                 not permitted).
     * @param yFormat  the format object for the y values (<code>null
     *                 not permitted).
     */
    protected AbstractXYItemLabelGenerator(String formatString,
                                           NumberFormat xFormat,
                                           NumberFormat yFormat) {

        if (formatString == null) {
            throw new IllegalArgumentException("Null 'formatString' argument.");
        }
        if (xFormat == null) {
            throw new IllegalArgumentException("Null 'xFormat' argument.");
        }
        if (yFormat == null) {
            throw new IllegalArgumentException("Null 'yFormat' argument.");
        }
        this.formatString = formatString;
        this.xFormat = xFormat;
        this.yFormat = yFormat;

    }

    /**
     * Creates an item label generator using the specified number formatters.
     *
     * @param formatString  the item label format string (<code>null
     *                      not permitted).
     * @param xFormat  the format object for the x values (<code>null
     *                 permitted).
     * @param yFormat  the format object for the y values (<code>null
     *                 not permitted).
     */
    protected AbstractXYItemLabelGenerator(String formatString,
                                           DateFormat xFormat,
                                           NumberFormat yFormat) {

        this(formatString, NumberFormat.getInstance(), yFormat);
        this.xDateFormat = xFormat;

    }

    /**
     * Creates an item label generator using the specified formatters (a
     * number formatter for the x-values and a date formatter for the
     * y-values).
     *
     * @param formatString  the item label format string (<code>null
     *                      not permitted).
     * @param xFormat  the format object for the x values (<code>null
     *                 permitted).
     * @param yFormat  the format object for the y values (<code>null
     *                 not permitted).
     *
     * @since 1.0.4
     */
    protected AbstractXYItemLabelGenerator(String formatString,
            NumberFormat xFormat, DateFormat yFormat) {

        this(formatString, xFormat, NumberFormat.getInstance());
        this.yDateFormat = yFormat;
    }

    /**
     * Creates an item label generator using the specified number formatters.
     *
     * @param formatString  the item label format string (<code>null
     *                      not permitted).
     * @param xFormat  the format object for the x values (<code>null
     *                 permitted).
     * @param yFormat  the format object for the y values (<code>null
     *                 not permitted).
     */
    protected AbstractXYItemLabelGenerator(String formatString,
                                           DateFormat xFormat,
                                           DateFormat yFormat) {

        this(formatString, NumberFormat.getInstance(),
                NumberFormat.getInstance());
        this.xDateFormat = xFormat;
        this.yDateFormat = yFormat;

    }

    /**
     * Returns the format string (this controls the overall structure of the
     * label).
     *
     * @return The format string (never <code>null).
     */
    public String getFormatString() {
        return this.formatString;
    }

    /**
     * Returns the number formatter for the x-values.
     *
     * @return The number formatter (possibly <code>null).
     */
    public NumberFormat getXFormat() {
        return this.xFormat;
    }

    /**
     * Returns the date formatter for the x-values.
     *
     * @return The date formatter (possibly <code>null).
     */
    public DateFormat getXDateFormat() {
        return this.xDateFormat;
    }

    /**
     * Returns the number formatter for the y-values.
     *
     * @return The number formatter (possibly <code>null).
     */
    public NumberFormat getYFormat() {
        return this.yFormat;
    }

    /**
     * Returns the date formatter for the y-values.
     *
     * @return The date formatter (possibly <code>null).
     */
    public DateFormat getYDateFormat() {
        return this.yDateFormat;
    }

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

    /**
     * Returns the string representing a null value.
     *
     * @return The string representing a null value.
     *
     * @since 1.0.10
     */
    public String getNullYString() {
        return this.nullYString;
    }

    /**
     * Creates the array of items that can be passed to the
     * {@link MessageFormat} class for creating labels.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return An array of three items from the dataset formatted as
     *         <code>String objects (never null).
     */
    protected Object[] createItemArray(XYDataset dataset, int series,
                                       int item) {
        Object[] result = new Object[3];
        result[0] = dataset.getSeriesKey(series).toString();

        double x = dataset.getXValue(series, item);
        if (this.xDateFormat != null) {
            result[1] = this.xDateFormat.format(new Date((long) x));
        }
        else {
            result[1] = this.xFormat.format(x);
        }

        double y = dataset.getYValue(series, item);
        if (Double.isNaN(y) && dataset.getY(series, item) == null) {
            result[2] = this.nullYString;
        }
        else {
            if (this.yDateFormat != null) {
                result[2] = this.yDateFormat.format(new Date((long) y));
            }
            else {
                result[2] = this.yFormat.format(y);
            }
        }
        return result;
    }

    /**
     * Tests this object for equality with an arbitrary object.
     *
     * @param obj  the other object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof AbstractXYItemLabelGenerator)) {
            return false;
        }
        AbstractXYItemLabelGenerator that = (AbstractXYItemLabelGenerator) obj;
        if (!this.formatString.equals(that.formatString)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.xFormat, that.xFormat)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.xDateFormat, that.xDateFormat)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.yFormat, that.yFormat)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.yDateFormat, that.yDateFormat)) {
            return false;
        }
        if (!this.nullYString.equals(that.nullYString)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code for this instance.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 127;
        result = HashUtilities.hashCode(result, this.formatString);
        result = HashUtilities.hashCode(result, this.xFormat);
        result = HashUtilities.hashCode(result, this.xDateFormat);
        result = HashUtilities.hashCode(result, this.yFormat);
        result = HashUtilities.hashCode(result, this.yDateFormat);
        return result;
    }

    /**
     * Returns an independent copy of the generator.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if cloning is not supported.
     */
    public Object clone() throws CloneNotSupportedException {
        AbstractXYItemLabelGenerator clone
                = (AbstractXYItemLabelGenerator) super.clone();
        if (this.xFormat != null) {
            clone.xFormat = (NumberFormat) this.xFormat.clone();
        }
        if (this.yFormat != null) {
            clone.yFormat = (NumberFormat) this.yFormat.clone();
        }
        if (this.xDateFormat != null) {
            clone.xDateFormat = (DateFormat) this.xDateFormat.clone();
        }
        if (this.yDateFormat != null) {
            clone.yDateFormat = (DateFormat) this.yDateFormat.clone();
        }
        return clone;
    }

}

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